GEMPAK Conversion Guide

The popular meteorological plotting and analysis tool GEMPAK is no longer formally supported and Unidata is only producing occasional maintenance releases. To help GEMPAK users convert to the Python ecosystem we have compiled this list of GEMPAK programs, commands, parameters, etc. and their Python equivalents. These tables are continually updated as we add more functionality to MetPy as part of an National Science Foundation grant. Where issues have been filed, we have linked to them. Please feel free to tackle of these, comment on their importance in the issue tracker, or file a new issue.

Green rows represent implemented functionality, red is not implemented (with issue listed), blue is uncertain of parity, and white is unevaluated.

GEMPAK Scalar Output/Scalar Grid

GEMPAK Function	Description	Python/MetPy Equivalent	Grid Compatible?	Tested against GEMPAK?	Units?
ABS(S)	Absolute value	numpy.absolute	Yes	No	Yes
ACOS(S)	Arc cosine	numpy.arccos	Yes	No
ASIN(S)	Arc sine	numpy.arcsin	Yes	No
ATAN(S)	Arc tangent	numpy.arctan	Yes	No
ATN2(S1, S2)	Arc tangent	numpy.arctan2	Yes	No
COS(S)	Cosine	numpy.cos	Yes	No
EXP(S1, S2)	Exponential to real	S1**S2	Yes	No	Yes
EXPI(S1, S2)	Exponential to integer (uses NINT)	S1 ** S2.astype(int)	Yes	No
INT(S)	Convert to integer	S.astype(int)	Yes	No	No
LN(S)	Natural logarithm	numpy.log	Yes	No	Yes
LOG(S)	Base 10 logarithm	numpy.log10	Yes	No	Yes
NINT(S)	Round to nearest integer	numpy.round	Yes	No	Yes
SIN(S)	Sine	numpy.sin	Yes	No
SQRT(S)	Square root	numpy.sqrt	Yes	No	Yes
TAN(S)	Tangent	numpy.tan	Yes	No
NCDF(S1, S2, S3)	Cumulative normal distribution for value, mean, std dev	scipy.stats.norm.cdf
INCD(S1, S2, S3)	Inverse cumulative normal distribution value given cumulative probability, mean, std dev	scipy.stats.norm.ppf(scipy.stats.norm.cdf)
BNCDF(S1, S2, S3, S4)	Cumulative binormal mixture distribution given value, mode, left sigma, and right sigma	scipy.stats.multivariate_normal
IBNCDF(S1, S2, S3, S4)	Inverse cumulative binormal mixture distribution value given cumulative probability, mode, left sigma, and right sigma
PAUB(S1, S2, S3)	Combine probabilities (S1 or S2) with dependency parameter S3
ADD(S1, S2)	Addition	S1 + S2		No
MUL(S1, S2)	Multiplication	S1 * S2		No
QUO(S1, S2)	Division	S1 / S2		No
SUB(S1, S2)	Subtraction	S1 - S2		No
BOOL(S)	Boolean function
SLT(S1, S2)	Less than function	S1 < S2		No
SLE(S1, S2)	Less than or equal to function	S1 <= S2		No
SGT(S1, S2)	Greater than function	S1 > S2		No
SGE(S1, S2)	Greater than or equal to function	S1 >= S2		No
SBTW(S1, S2, S3)	Between two values function	S1 > S2 and S1 < S3		No
SMAX(S1, S2)	Maximum of S1 and S2
SMIN(S1, S2)	Minimum of S1 and S2
MASK(S1, S2)	Mask S1 based on S2
MISS(S1, S2)	Set missing values in S1 to S2
ADV(S, V)	Advection	metpy.calc.advection		No
AVG(S1, S2)	Average	numpy.mean(np.array([S1, S2]), axis=0)	Yes	No	No
AVOR(V)	Absolute vorticity	metpy.calc.absolute_vorticity
BVSQ(THTA)	Brunt-Vaisala frequency squared in a layer	metpy.calc.brunt_vaisala_frequency_squared (use with metpy.calc.mixed_layer to obtain layer average)
CROS(V1, V2)	Vector cross product magnitude	numpy.cross(V1, V2)		No
DDEN(PRES, TMPC)	Density of dry air	metpy.calc.density(mixing=0)		No
DDR(S)	Partial derivative with respect to R	metpy.calc.first_derivative		No
DDT(S)	Time derivative	metpy.calc.first_derivative		No
DDX(S)	Partial derivative with respect to X	metpy.calc.first_derivative		No
DDY(S)	Partial derivative with respect to Y	metpy.calc.first_derivative		No
DEF(V)	Total deformation	metpy.calc.total_deformation		No
DIRN(V)	Direction relative to north
DIRR(V)	Direction relative to grid
DIV(V)	Divergence	metpy.calc.h_divergence		No
DIVT(S, V)	Divergence tendency (only for cylindrical grids)
DOT(V1, V2)	Vector dot product	numpy.dot(V1, V2)		No
DTH(S)	Partial derivative with respect to theta	metpy.calc.first_derivative		No
FCNT(S)	Coriolis force at grid center (polar)	metpy.calc.coriolis_parameter		No
FOSB(TMPC, RELH, SPED)	Fosberg index (Fire weather index frontogenesis)	Issue #636
FRNT(THETA, V)	Frontogenesis	metpy.calc.frontogenesis		No
GWFS(S, N)	Filter with normal distribution of weights	metpy.calc.smooth_gaussian	Yes	Yes
RDFS(S, DX)	GWFS applied for given output resolution
HIGH(S, RADIUS)	Relative maxima over a grid
JCBN(S1, S2)	Jacobian determinant
KNTS(S)	Convert m/s to knots	.to('knots')		No
LAP(S)	Laplacian operator	metpy.calc.laplacian		No
LAV(S)	Layer average (2-levels)
LDF(S)	Layer difference (2-levels)
LOWS(S, RADIUS)	Relative minima over a grid
MAG(V)	Magnitude of a vector	numpy.linalg.norm		No
MASS	Mass per unit volume in a layer from PRES
MDIV(V)	Layer-avg. mass divergence
MIXR(DWPC, PRES)	Mixing ratio	metpy.calc.mixing_ratio		No
MRAD(V, LAT, LON, DIR, SPD)	Magnitude of radial wind	Issue #653
MSDV(S, V)	Layer-avg. mass-scalar flux divergence	Issue #655
MSFC(V)	Pseudo angular momentum (cross-sections)	metpy.calc.absolute_momentum		No
MTNG(V, LAT, LON, DIR, SPD)	Magnitude of tangential wind	Issue #653
NORM(V)	Normal component (cross-sections)	metpy.calc.normal_component		No
NMAX(S, ROI)	Neighborhood maximum value for a radius of influence
NMIN(S, ROI)	Neighborhood minimum value for a radius of influence
PLAT(S)	Latitude at each point (polar)
PLON(S)	Longitude at each point (polar)
PLCL(PRES, TMPC, DWPC)	Pressure of the lifting condensation level	metpy.calc.lcl		No
POIS(S1, S2)	Solve Poisson equation of forcing function with boundary conditions	Issue #651
POLF(S)	Coriolis force at each point (polar)	metpy.calc.coriolis_parameter		No
PVOR(S, V)	Potential vorticity in a layer	metpy.calc.potential_vorticity_baroclinic metpy.calc.potential_vorticity_barotropic		No
PVR3(S, V)	3-D potential vorticity for a level	Issue #649
RELH(TMPC, DWPT)	Relative humidity	metpy.calc.relative_humidity_from_dewpoint		No
RICH(V)	Richardson stability number in a layer	Issue #647
ROSS(V1, V2)	Rossby number	Issue #637
SAVG(S)	Average over whole grid	numpy.mean		No
SAVS(S)	Average over display subset area of grid	numpy.mean		No
SDIV(S, V)	Flux divergence of a scalar	Issue #646
SGMX(S)	Maximum of S over GAREA	numpy.nanmax		No
SGMN(S)	Minimum of S over GAREA	numpy.nanmin		No
SHR(V)	Shearing deformation	metpy.calc.shearing_deformation		No
SM5S(S)	5-point smoother	Issue #659
SM9S(S)	9-point smoother	Issue #659
STAB(TMPC)	Lapse rate over a layer in K/km
STR(V)	Stretching deformation	metpy.calc.stretching_deformation		No
TANG(V)	Tangential component (cross-sections)	metpy.calc.tangential_component		No
TAV(S)	Time average
TDF(S)	Time difference
THES(PRES, TMPC)	Saturated equivalent potential temperature	metpy.calc.saturation_equivalent_potential_temperature		No
THTA(TMPC, PRES)	Potential temperature	metpy.calc.potential_temperature		No
THTE(PRES, TMPC, DWPC)	Equivalent potential temperature	metpy.calc.equivalent_potential_temperature		No
THWC(PRES, TMPC, DWPC)	Wet bulb temperature	metpy.calc.wet_bulb_temperature		No
TLCL(TMPC, DWPC)	Temperature of the lifting condensation level	metpy.calc.lcl		No
TMST(THTE, PRES)	Parcel temperature along a moist adiabat	metpy.calc.moist_lapse		No
TMWK(PRES, TMPK, RMIX)	Web bulb temperature in Kelvin	metpy.calc.wet_bulb_temperature		No
DSUB(V1, V2)	DIRN(V1) - DIRN(V2)
UN(V)	North relative u component
UR(V)	Grid relative u component
VN(V)	North relative v component
VOR(V)	Vorticity	metpy.calc.v_vorticity		No
VR(V)	Grid relative v component
WNDX(S1, S2, S3, S4)	WINDEX (index for microburst potential)	Issue #639
WSHR(V)	Magnitude of the vertical wind shear in a layer
XAV(S)	Average along a display subset grid row	numpy.mean(a, axis=1)	Yes	No	Yes
XSUM(S)	Sum along a display subset grid row	numpy.sum(a, axis=1)	Yes	No	Yes
YAV(S)	Average along a display subset grid column	numpy.mean(a, axis=0)	Yes	No	Yes
YSUM(S)	Sum along a display subset grid column	numpy.sum(a, axis=0)	Yes	No	Yes

Vector Output Grid

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
AGE(S)	Ageostrophic wind	metpy.calc.ageostrophic_wind		No
CIRC(V, S)	Circulation (cross-section)	Issue #662
DVDX(V)	Partial x derivative of V	metpy.calc.first_derivative		No
DVDY(V)	Partial y derivative of V	metpy.calc.first_derivative		No
GCIR(LAT, LON)	Great circle from point to antipodal point
GCWV(LAT, LON, MASK)	Great circle from point to antipodal point with land blocking algorithm MASK will usually be SEA
GEO(S)	Geostrophic wind	metpy.calc.geostrophic_wind		No
GRAD(S)	Gradient of a scalar	metpy.calc.gradient		No
GWFV(V, N)	Filter with normal distribution of weights	Issue #664
RDFV(V, DX)	GWFV applied for given output resolution
INAD(V1, V2)	Inertial advective wind	metpy.calc.inertial_advective_wind		No
ISAL(S)	Isallobaric wind	Issue #641
KCRS(V)	Curl of V
KNTV(V)	Convert m/s to knots	.to('knots')		No
LTRN(S, V)	Layer-averaged transport of a scalar
NORMV(V)	Vector normal wind (cross-section)	metpy.calc.normal_component		No
QVEC(S, V)	Q-vector at a level	metpy.calc.q_vector		No
QVCL(THTA, V)	Q-vector of a layer	metpy.calc.q_vector (use with metpy.calc.mixed_layer to obtain layer average of each component)
RAD(V, LAT, LON, DIR, SPD)	Storm relative radial wind
ROT(angle, V)	Coordinate rotation
SMUL(S, V)	Multiply a vector's components by a scalar
SM5V(V)	5-point smoother	Issue #659
SQUO(S, V)	Vector division by a scalar
TANGV(V)	Vector tangential wind (cross-section)	metpy.calc.tangential_component		No
THRM(S)	Thermal wind over a layer
TNG(V, LAT, LON, DIR,SPD)	Storm relative tangential wind	Issue #658
VADD(V1, V2)	Add the components of two vectors
VASV(V1, V2)	Vector component of V1 along V2
VAVG(V)	Average over whole grid
VAVS(V)	Average vector over display subset grid
VECN(S1, S2)	Create vector from north relative components
VECR(S1, S2)	Create vector from grid relative components
VESD(SPD, DIR)	Create vector from speed and north-rel direction
VLAV(V)	Layer average for a vector
VLDF(V)	Layer difference for a vector
VMUL(V1, V2)	Multiple the components of two vectors
VQUO(V1, V2)	Divide the components of two vectors
VSUB(V1, V2)	Subtract the components of two vectors
VLT(V, S)	Less than function
VLE(V, S)	Less than or equal to function
VGT(V, S)	Greater than function
VGE(V, S)	Greater than or equal to function
VBTW(V, S1, S2)	Between two values function
VMSK(V, S)	Mask V based on S

Logical Output Grid

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
LT(S1, S2)	Returns 1 if S1 < S2
LE(S1, S2)	Returns 1 if S1 <= S2
GT(S1, S2)	Returns 1 if S1 > S2
GE(S1, S2)	Returns 1 if S1 >= S2
GTLT(S1, S2, S3)	Returns 1 if S1 > S2 and S1 < S3
GELT(S1, S2, S3)	Returns 1 if S1 >= S2 and S1 < S3
GTLE(S1, S2, S3)	Returns 1 if S1 > S2 and S1 <= S3
GELE(S1, S2, S3)	Returns 1 if S1 >= S2 and S1 <= S3
EQ(S1, S2, S3)	Returns 1 if |S1-S2| <= S3
NE(S1, S2, S3)	Returns 1 if |S1-S2| > S3
AND(S1, S2, ..., Sn)	Returns 1 if all Sx > 0
OR(S1, S2, ..., Sn)	Returns 1 if at least one Sx > 0
EOR(S1, S2, ..., Sn)	Returns 1 if exactly one Sx > 0
NOT(S)	Returns 1 if S ==0

Ensemble Functions

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
ENS_SAVG(input_arg1 & input_arg2)	Compute the average of a scalar diagnostic field over an ensemble. This average is an equally weighted ensemble mean unless weights have been specified in the GDFILE entry as described above or in input_arg2. Input_arg1 specifies the scalar field to average and is a dynamic argument. Input_arg2 specifies the name of a weight grid to be used in the calculation.
ENS_SSPRD(input_arg1)	Compute the spread (sample standard deviation) of a scalar diagnostic field over an ensemble. Input_arg1 specifies the scalar field and is a dynamic argument. The formula used to compute the spread is SQRT { [ SUM ( Xi**2 ) - ( SUM (Xi) ** 2 ) / N ] / ( N -1 ) } where SUM is the summation over the members, Xi are values of the scalar field from individual ensemble members, and N is the number of members. Note that the average of the squared deviations from the mean is computed by dividing the sum of the squared deviations by ( N - 1 ).
ENS_SSUM(input_arg1)	Compute the non-weighted sum of the values of a scalar field over an ensemble. Note that this returns the number of members in the ensemble if "input_arg1"" is a logical function that always evaluates to 1 [e.g. gt(2<1)]
ENS_SWSPRD(input_arg1 & input_arg2)	Compute the spred, similar to ENS_SSPRD, of a scalar diagnostic field over an ensemble. The spread is weighted and input_arg2 specifies the name of a weight grid to be used in the calculation. NOTE: For uniform weights ens_ssprd (input_arg1) might be expected to give the same result as ens_swsprd(input_arg1 & w1) where w1 is uniform field of 1. This does not happen because of the division by (N-1) in ens_ssprd. The same is also true in comparing ens_vsprd and ens_vwsprd results.
ENS_VAVG(input_arg1 & input_arg2)	Compute the average of a vector diagnostic field over an ensemble. This average is an equally weighted ensemble mean unless weights have been specified in the GDFILE entry as described above or in input_arg2. Input_arg1 specifies the vector field to average and is a dynamic argument. Input_arg2 specifies the name of a weight grid to be used in the calculation.
ENC_VSPRD(input_arg1)	Compute the spread (sample standard deviation) of a vector diagnostic field over an ensemble. Input_arg1 specifies the vector field and is a dynamic argument. The formula used to compute the variance for each individual component of a vector is the same as for ENS_SSPRD. The variances of the components are added, then the square root is taken to compute the vector spread, which is a scalar.
ENS_VWSPRD(input_arg1 & input_arg2)	Compute the spred, similar to ENS_VSPRD, of a vector diagnostic field over an ensemble. The spread is weighted and input_arg2 specifies the name of a weight grid to be used in the calculation. Also, see NOTE for function ENS_SWSPRD.
ENS_SMAX(input_arg1)	Compute the maximum of a scalar diagnostic field over an ensemble.
ENS_SMIN(input_arg1)	Compute the minimum of a scalar diagnostic field over an ensemble.
ENS_SRNG(input_arg1)	Compute the range of a scalar diagnostic field over an ensemble. The range is defined as the difference between the maximum and the minimum.
ENS_PRCNTL(input_arg1 & input_arg2 & input_arg3)	At each grid point determine the value of input_arg1 such that it exceeds that found in P% of the members of the ensemble, where P is given by input_arg2. The first argument is a dynamic argument, the second is a static argument. Input_arg3 specifies the name of a weight grid to be used in the calculation. The value of P must range between 0 and 100, and it may vary from grid point to grid point. If the ensemble members are weighted, it is the sum of the weights associated with the order statistics that determines the value corresponding to the percentile. If the percentile falls between two members, the value is determined by interpolation
ENS_MODE(input_arg1 & input_arg2)	At each grid point, determine the mode of a weighted ensemble distribution. The mode value is the first one found by a trisection algorithm. The algorithm uses a moving, shrinking data interval in which the weight sums for the data values are made in each of three subintervals. The largest weight sum determines the next interval, with ties decided in the direction of the data mean. The algorithm terminates when only the middle subinterval has a non-zero sum of weights. The weighted average of the data values in this lone subinterval is the mode. Input_arg2 specifies the name of a weight grid to be used in the calculation.
ENS_PROB(input_arg1)	Compute the probability of the multi-variate expression given in the input argument. The expression in the input argument is composed of the logical functions AND, OR, and EOR operating on the logical arithmetic comparison functions LT, LE, GT, GE, GTLT, GELT, GTLE, and GELE. ENS_PROB computes the weighted average of the 1 or 0 logical evaluations over the members of the ensemble to yield the relative frequency, or probability, of occurrence.
ENS_CPRB(input_arg1 & input_arg2 & input_arg3 & input_arg4)	At each grid point, determine the univariate cumulative probability that the value of a given function is less than or equal to a given value in an ideal ensemble. The input arguments are, respectively, the function to evaluate, the given value whose cumulative probability is sought, the lower bound below which values of the function are impossible, and the upper bound above which values of the function are impossible. If a value for input_arg2 is outside of a given bound, the result is a missing value. The first argument is a dynamic argument; the others are static. The last two are optional. To omit input_arg3 but include input_arg4, specify input as ( input_arg1 & input_arg2 & & input_arg4 ).All arguments may be functions that vary from one grid point to another. For an ideal ensemble, there is a 2/(N+1) probability of values falling outside of the ensemble envelope. The probability density function is piecewise linear with triangular extrapolations beyond the ensemble, limited by any bounding values given. The following example finds the cumulative probability o
ENS_CVAL(input_arg1 & input_arg2 & input_arg3 & input_arg4)	At each grid point, determine the value of a given function such that the univariate cumulative probability of values less than or equal to the computed value is the given probability, assuming an ideal ensemble. The input arguments are, respectively, the function to evaluate, the given cumulative probability ranging from 0 to 1, the lower bound below which values of the function are impossible, and the upper bound above which values of the function are impossible. A computed value will never fall outside of a bounding value. The first argument is a dynamic argument; the others are static. The last two are optional. To omit input_arg3 but include input_arg4, specify input as ( input_arg1 & input_arg2 & & input_arg4 ). All arguments may be functions that vary from one grid point to another. If the value of the second argument is not between 0 and 1, inclusive, then a missing value is assigned at that grid point. For an ideal ensemble, there is a 2/(N+1) probability of values falling outside of the ensemble envelope. The probability density function is piecewise linear with triangular extrapolations beyond the ensemble, limited by any bounding values given.

Layer Functions

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
LYR_SWTM(input_arg1 | levels)	Computes the weighted mean of a scalar field. If the input argument is a single-level parameter or function, the weight is the depth of the layer extending from point halfway between the level and the next lower level and the point halfway between the level and the next upper level. If the input argument is a two-level function, then the weight is the depth of the two-level layer used in calculating the function. In isobaric coordinates, the logarithm of pressure is used to compute the depths. Input_arg1 specifies diagnostic function to average over the layers and output_arg is not required.
LYR_MXMN(argin & fldout [&argout] [|lvls]	Computes the following over the specified range of levels... 1.The maximum or minimum value of a scalar quantity. 2.The value of a second output function coincident with the extrema of the input function. It might be a level, such as HGHT or PRES. It might be some other function, e.g. absolute vorticity.
LYR_FVONISFC(fvalu & fisfc & visfc & n & gradflag [|lvls]	Computes the value of a function on a specified isosurface of a second function. The function will have the ability to traverse the atmosphere starting from the bottom level upwards or top level downwards and return either the 1st, 2nd, or nth level at which the isosurface threshold value exist.

GUI Programs

Program	Description	Python/MetPy Equivalent
nfax	Displays NMX 6 bit raster fax products
nmap	Displays and animates different types of meteorological data on a geographic background.
nsharp	Advanced interactive sounding analysis program
ntrans	Displays and animates N-AWIPS graphics metafiles in an X-Window.
nwx	Displays text products from the Family of Services (FOS) data feed.

Decoders

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
dcacars	NetCDF ACARS data
dcacft	Raw AIREP, PIREP, RECCO, and AMDAR reports
dcairm	AIRMET (AIRman's METeorological Information) reports
dccosmic
dccsig	Convective signet and convective outlook reports
dcffa	Flash flood watch reports
dcffg	Flash flood guidance data
dcgmos	GFS MOS
dcgrib	GRIB
dcgrib2	GRIB2
dchrcn	Forecast/advisory reports for tropical depressions, tropical storms, and hurricanes for the Atlantic and Pacific oceans.
dcigdr	IGDR data in BUFR format
dcisig	SIGMET reports
dclsfc	Land surface synoptic reports
dcmetr	Raw SAO and METAR reports
dcmsfc	Raw buoy, ship, C-MAN, and Coast Guard reports
dcncon	Non-convective SIGMET reports
dcncprof	NetCDF format profiler and RASS reports from NOAA/FSL
dcnexr2	CRAFT IDD data stream
dcnldn	NLDN lightning data reports
dcnmos	NGM MOS
dcprof	BUFR format profiler reports
dcrdf	Regional digital forecast (RDF)
dcredbook	Creates displays of Redbook graphic format products
dcscd	Supplemental Climatological Data reports
dcshef	Raw SHEF reports
dcshef_comet	Data feed (LDM) raw SHEF reports
dcstorm	Severe storm reports from SPC
dcsuomi	NetCDF format SUOMINET data
dcsvrl	Severe local storm reports (tornado and severe thunderstorm watch reports)
dctaf	Raw terminal aerodrome forecast (TAF) reports
dctama	TAMDAR data in BUFR format
dctrop	Hurricane/tropical storm reprots
dcuair	Upper air sounding data
dcuspln	USPLN lightning data reports
dcwarn	Flash flood, tornado, and severe thunderstorm warning reports
dcwatch	WWUS40 format severe thunderstorm and tornado watch box bulletins
dcwcn	Watch county notification reports
dcwcp	Tornado and severe thunderstorm Watch Corner Points (WCP) reports
dcwou	Watch outline update reports
dcwstm	Winter storm reports
dcwtch	Tornado and severe thunderstorm watch box reports and watch status reports
dcxmos	GFSX MOS

Programs

GEMPAK Function	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
acprof	Draws profiles of ACARS data
bfr2gp	Transfers data from a Jack Woollen BUFR file into GEMPAK sounding and surface data files
bufrenc	Processes ASCII input file to produce one or more BUFR output files
cpcgstn	Searches for stations located inside specified area from a vector graphics file
gd2ndfd	Converts a GEMPAK grid to an NDFD GRIB2 file
gdbiint	Interpolates grids from one projection to another
gdcfil	Creates a GEMPAK grid file
gdcntr	Draws contour lines through a scalar grid	matplotlib.axes.Axes.contour		No
gdcross	Displays a vertical cross section of scalar and/or vector grids
gddelt	Deletes grids from GEMPAK grid files
gddiag	Computes a scalar/vector diagnostic grid and adds it to the grid file
gdedit	Reads grids from a sequential edit file and adds them to a GEMPAK grid file
gdfrzl	Generates GFA FZLVLs in VG format from a scalar grid
gdgrib2	Computes a scalar diagnostic grid and adds it to a GRIB2 file
gdgrib	Computes a scalar diagnostic grid and adds it to a GRIB file
gdgsfc	Computes grid data and interpolates to stations in a GEMPAK surface file
gdinfo	Lists information about GEMPAK grid files
gdlist	Lists data from a scalar grid
gdmap	Plots data from a scalar grid
gdmod	Moves grids from one GEMPAK grid file to another
gdobscnt	Creates a gridded sampling of the number of surface observations within a specified radius of each grid point.
gdomeg	Computes grids of vertical motion and adds them to the grid file
gdplot2	Draws contour lines through scalar grids and/or wind barbs or arrows or streamlines through vector grids. Multiple sets of contours, vectors, and/or streamlines can be generated for each frame.
gdplot3	Draws contour lines through scalar grids and/or wind barbs or arrows or streamlines through vector grids. the program also plots contents of a text file and/or objects. Multiple sets of contours, vectors, streamlines, objects and/or text files can be generated for each frame.
gdplot	Draws contour lines through scalar grids and/or wind barbs or arrows through vector grids. Multiple sets of contours and vectors can be generated for each frame.
gdprof	Draws profiles of a scalar grid and/or a vector grid.
gdptpdf	Raw cumulative probability or probability density at selected point and time at a single level.
gdpvsf	Vertically interpolates grid data to an arbitrary surface.
gdradrc	Creates a gridded composite of Canadian ASCII products
gdradr	Creates a gridded composite of NEXRAD level III products
gdstat	Computes statistics on a time series of scalar grids
gdstream	Draws streamlines through a vector grid
gdthgt	Draws contours and wind barbs or arrows on a time selection at a point within a grid
gdtopo	Creates a GEMPAK GRID file from a raster file of topography or land use values.
gdtser	Draws a time series of a scalar at a single level
gdtspdf	Draws contour or color fill of cumulative probability or probability density as a function of grid values and forecast time at a selected point and level or layer.
gdvint	Performs interpolation between vertical coordinates
gdwind	Displays a vector grid using wind barbs or arrows
gpanot	Will allow the user to place objects at any location on the current graphic device
gpbox	Draws a box around a region
gpclear	Clears the current graphics device
gpclose	Closes the specified graphics output window or file
gpcolor	Changes the colors on a color device
gpend	Terminates the GEMPLT subprocesses.
gpfax	Creates a postscript, GIF, or TIFF file, or an X Windows display from a 6-bit fax file.
gpfront	Version of GPMAP that plots map symbols interpreted from ASUS1 bulletins. Forecast front positions from FSUS2 bulletins can be plotted by specifying the forecast hour desired.
gpltln	Draws a map, LAT/LON lines with a selected marker, and various image and graphic products
gpmap	Draws a map, LAT/LON lines, and various images and graphic products.
gpnexr2	Displays NEXRAD level II products.
gpnids	Plots NEXRAD level III products
gprcm	Version of GPMAP that plots Radar Coded Message (RCM) bulletins
gpscat	Draws scatterometer wave height and wind maps, LAT/LON lines, and various controllable image and graphic customizations.
gptcww	Generates the track error watch/warn pilot for the TPC, using breakpoint information contained in a VGF file.
gptext	Draws the contents of a text file to the output device.
gptpc	Generates four hurricane graphics from the TPC. 1) Wind swath plot 2) Strike probability plot 3) Wind intensity graph 4) Wind speed table
gptraj	Computes trajectories for gridded data files
gpvad	Plots NEXRAD level III VAD wind profile
gpwarn	Version of GPMAP that plots filled county/zone regions from reports which use the universal generic county/zone identified lines.
grphgd	Generates a grid either from contours drawn via NMAP product generation, or from a provided VGF file
img2gd	Converts an image to a grid. The grid navigation specified may be different than that of the source image.
mkelev	NOT FOUND
nagrib2	Converts gridded data in GRIB2 files to GEMPAK gridded data
nagrib	Converts gridded data in GRIB files to GEMPAK gridded data
namsnd	Transfers model profile output in BUFR to GEMPAK sounding and surface data files.
ndfdg2	Converts NDFD gridded data in GRIB2 files to GEMPAK gridded data
nex2gini	Creates as GINI format image composite of NEXRAD level III products
nex2img	Creates a GIF format image composite of NEXRAD level III products
nexr2rhi	Displays NEXRAD level II vertical cross sections
nexrcomp	Creates a GINI format image composite of NEXRAD level III products
oabox	Draws a box around an objective analysis region
oabsfc	Performs a Barnes objective analysis on surface data
oabsnd	Performs a Barnes objective analysis on upper air data
oagrid	Creates a GEMPAK grid file which can be used in a Barnes objective analysis program
sector	Subsets a GINI satellite image in area and pixel resolution.
sfcfil	Creates a new GEMPAK surface file
sfchck	Reads a GEMPAK surface data file and produces a table of stations and an indicator showing whether each station reported data at each time in the file
sfcntr	Plots surface station data on a map and optionally contours one of the fields being plotted
sfdelt	Deletes data from a surface data file
sfdsl604	Lists data from a GEMPAK surface file in a fixed format for use on the AMS DataStreme website
sfedit	Adds or changes data in a surface file using a sequential text file
sfgram	Draws a meteorogram for surface data
sfl604	Lists data from a GEMPAK surface file in a fixed format
sflist	Surface data from a GEMPAK surface data file
sfmap	Plots surface station data on a map
sfmod	Moves selected surface data from an input surface file to an output surface file
sfstns	Modifies the station information in a surface file
sfvgsf	Adds or changes data in a surface file using the elements found in a Vector Graphics File
sncfil	Creates a new GEMPAK sounding file
sncross	Draws cross sections through sounding data
sndelt	Deletes data from a sounding data file
sndslist	Lists upper air data from a sounding file for specified vertical levels and stations in a format used for the AMS DataStreme web site.
snedit	Adds data in a sequential edit file to a sounding file
snhodo	Draws a hodograph of upper air data
snlist	Lists upper air data from a sounding file for specified vertical levels and stations
snmap	Plots sounding data on a map
snmod	Moves selected sounding data from an input sounding file to an output sounding file
snprof	Draws profiles of upper air data
snstns	Modifies the station information in the upper air file
sntser	Draws a time series at a sounding station
vg2uka	Converts VG files to ASCII files, using the UKMET browsable ASCII format.

Parameters

GEMPAK	Description	Python/MetPy Equilvalent	Grid Compatible?	Tested against GEMPAK?	Units?
Temperature Parameters
TMPC	Temperature in Celsius
TMPF	Temperature in Fahrenheit
TMPK	Temperature in Kelvin
STHA	Surface potential temperature in Kelvin
STHK	Surface potential temperature in Kelvin
STHC	Surface potential temperature in Celsius
STHE	Surface equivalent potential temperature in Kelvin
STHS	Surface saturation equivalent potential temperature in Kelvin
THTA	Potential temperature in Kelvin
THTK	Potential temperature in Kelvin
THTC	Potential temperature in Celsius
THTE	Equivalent potential temperature in Kelvin
THTS	Saturation equivalent potential temperature in Kelvin
TVRK	Virtual temperature in Kelvin
TVRC	Virtual temperature in Celsius
TVRF	Virtual temperature in Fahrenheit
THTV	Virtual potential temperature in Kelvin
TDXC	Maximum 24 hour temperature in Celsius
TDNC	Minimum 24 hour temperature in Celsius
TDXF	Maximum 24 hour temperature in Fahrenheit
TDNF	Minimum 24 hour temperature in Fahrenheit
T6XC	Maximum 6 hour temperature in Celsius
T6NC	Minimum 6 hour temperature in Celsius
T6XF	Maximum 6 hour temperature in Fahrenheit
T6NF	Minimum 6 hour temperature in Fahrenheit
DMAX	Daily weather map maximum temperature in Fahrenheit
DMIN	Daily weather map minimum temperature in Fahrenheit
SSTC	Sea surface temperature in Celsius
SSTF	Sea surface temperature in Fahrenheit
LTMP	Temperature in Celsius of surface air lifted to 500 or !x mb
Moisture Parameters
DWPC	Dew point in Celsius
DWPF	Dew point in Fahrenheit
DWPK	Dew point in Kelvin
DPDC	Dew point depression in Celsius
DPDF	Dew point depress in Fahrenheit
DPDK	Dew point depression in Kelvin
MIXR	Mixing ratio	metpy.calc.mixing_ratio
MIXS	Saturated mixing ratio	metpy.calc.saturation_mixing_ratio
SMXR	Surface mixing ratio
SMXS	Surface saturated mixing ratio
RELH	Relative humidity	metpy.calc.relative_humidity_from_dewpoint		No
TMWK	Wet bulb temperature in Kelvin	metpy.calc.wet_bulb_temperature(pressures, temperatures, dewpoints).to('K')		No
TMWC	Wet bulb temperature in Celsius	metpy.calc.wet_bulb_temperature(pressures, temperatures, dewpoints).to('degC')		No
TMWF	Wet bulb temperature in Fahrenheit	metpy.calc.wet_bulb_temperature(pressures, temperatures, dewpoints).to('degF')		No
VAPR	Vapor pressure in millibars	metpy.calc.vapor_pressure
VAPS	Saturation vapor pressure in millibars	metpy.calc.saturation_vapor_pressure
LHVP	Latent heat of vaporization	metpy.constants.water_heat_vaporization
PWTR	Precipitable water at a given level	metpy.calc.precipitable_water
Height Parameters
HGHT	Height in meters
HGTM	Height in meters
HGTK	Height in kilometers
HGTD	Height in decameters
HGFT	Height in feet
HGFH	Height in hundreds of feet
HGFK	Height in thousands of feet
HGML	Height in miles
DHGT	Dry hydrostatic height in meters
MHGT	Moist hydrostatic height in meters
STDZ	Character standard height convention used on ua charts
RSTZ	Numeric standard height convention used on ua charts
ZMSL	Estimated height at a pressure level
Pressure and Altimeter Parameters
PRES	Station pressure in millibars
PMSL	Mean sea level pressure
PALT	Surface pressure in millibars from ALTI
ALTI	Altimeter setting in inches of mercury
ALTM	Altimeter setting converted to millibars
SALT	Abbreviated standard altimeter setting
SMSL	Abbreviated mean sea level pressure in millibars
SALI	Abbreviated altimeter setting in inches of mercury
RMSL	First 3 digits left of decimal of PMSL * 10
RSLI	First 3 digits left of decimal of ALTI * 100
RSLT	First 3 digits let of decimal of ALTM * 10
PTND	Pressure tendency
PTSY	Graphics symbol for pressure tendency
P03C	3-h numeric pressure change
P03D	Pressure tendency and change group, appp
P24C	2y-h numeric pressure change
PANY	Returns PMSL if available, if not, returns ALTM
RANY	Computes the 3 digit display of pressure
SANY	Creates a 3 character string from integral part of PMSL or ALTM
Winds
UWND	u wind in m/s
VWND	V wind in m/s
UKNT	U wind in knots
VKNT	V wind in knows
DRCT	Wind direction in degrees
SPED	Wind speed m/s
SKNT	Wind speed knots
SMPH	Wind speed mph
PSPD	Packed direction and speed m/s
PKNT	Packed direction and speed in knots
GUST	Wind gusts in knots
GUMS	Wind gusts in m/s
PWDR	Peak 5 -second wind direction in degrees
PWSP	Peak 5-second wind speed in m/s
PWHR	Hour of 5-second peak wind
PWMN	Minutes of 5-second peak wind
WNML	Wind component toward a direction 90 degrees CCW from specified direction
WCMP	Wind component toward a specified direction
BARB	Barb m/s
BRBM	Barb m/s
BRBK	Barb knots
BRBS	Barb mi/hr
ARRW	Arrows m/s
ARRM	Arrows m/s
ARRK	Arrows knots
DARR	Wind direction arrows of uniform length
Lifted Condenstaion Level
TLCL	Temperature in Kelvin at the LCL from the given level	metpy.calc.lcl
PLCL	Pressure in millibar at the LCL from the given level	metpy.calc.lcl
Stability Indices
BRCH	Bulk Richardson number	Issue #628
BRCV	BRCH computed using CAPV
BVFQ	Brunt-Vaisala frequency in a layer	metpy.calc.brunt_vaisala_frequency (use with metpy.calc.mixed_layer to obtain layer average)
BVPD	Brunt-Vaisala period in a layer	metpy.calc.brunt_vaisala_period (use with metpy.calc.mixed_layer to obtain layer average)
BVSQ	Brunt-Vaisala frequency squared in a layer	metpy.calc.brunt_vaisala_frequency_squared (use with metpy.calc.mixed_layer to obtain layer average)
CAPE	Convective available potential energy	metpy.calc.cape_cin
CAPV	CAPE computed by using virtual temperature
CINS	Convective inhibition	metpy.calc.cape_cin
CINV	CINS computed using virtual temperature
CTOT	cross totals index	Issue #633
EQLV	equilibrium level	metpy.calc.el
EQTV	EQLV computed using virtual temperature
KINX	K index	Issue #631
LAPS	temperature lapse rate in a layer	Issue #638
LCLP	pressure in millibars at the LCL from surface	metpy.calc.lcl
LCLT	temperature in Kelvin at the lcl from the surface	metpy.calc.lcl
LFCT	level of free convection by comparing temperature between a parcel and the environment	metpy.calc.lfc
LFCV	LFCT computed using the virtual temperature
LIFT	lifted index	Issue #632
LFTV	LIFT computed using the virtual temperature	Issue #632
LHAN	low elevation Haines index	Issue #635
MHAN	middle elevation Haines index	Issue #635
HHAN	high elevation Haines index	Issue #635
MLMR	mean mixed layer MIXR
MLTH	mean mixed layer THTA
PWAT	Precipitable water for the entire sounding	metpy.calc.precipitable_water
RICH	Richardson number in a layer	Issue #647
SEPA	Isentropic pressure thickness in a layer
SHOW	Showalter index	Issue #630
SHRD	wind shear direction in a layer
SHRM	wind shear magnitude in a layer
STAB	THTA lapse rate in a layer
STAP	THTA change with pressure in a layer
SWET	SWEAT index	Issue #634
TOTL	Total totals index	Issue #633
VTOT	vertical totals index	Issue #633
Cloud Parameters
xCLD	Character cloud coverage code
TCLD	xCLD at maximum cloud coverage
xCLO	Fractional cloud coverage
TCLO	xCLO at maximum cloud coverage
CLCx	Numeric cloud coverage
CLCT	CLCx at maximum cloud coverage
CLDS	combined cloud coverage short code from three levels
CMBC	combined cloud coverage numeric from three levels
CLHx	cloud height in hundreds of feet
CLDx	combined cloud height and short code
CLDT	CLDx at maximum coverage level
CLDB	CLDx at the lowest ceiling/layer
COMx	numeric combined cloud height and coverage combined
COMT	COMx at maximum coverage level
CHCx	Numeric combined cloud height and coverage combined
CHDx	combined cloud height and short code
CEIL	ceiling in hundreds of feet
CFRL	fraction of celestial dome covered by all low and mid level clouds from WMO code 2700
CTYL	low-level cloud genera from WMO code 0513
CTYM	mid-level cloud genera from WMO code 0515
CTYH	high-level cloud genera from WMO code 0509
CBAS	cloud base height from WMO code 1600
CSYL	cloud graphics symbol for CTYL
CSYM	cloud graphics symbol for CTYM
CSYH	cloud graphics symbol for CTYH
CSYT	cloud graphics symbol for first level reporting clouds
CFRT	cloud coverage number from CLCT (maximum clouds)
SKYC	cloud coverage graphics symbol for CFRT
SKYM	sky coverage symbol with wind barbs m/s
SKYK	sky coverage symbol with wind barbs knots
XVFR	categorical identification of flight rules
Weather Codes
WCOD	character weather code
WNUM	numeric weather code
WTMO	character WMO weather code
WWMO	numeric WMO weather code
WSYM	graphics weather symbol corresponding to WWMO
PWTH	character past weather WMO code or graphics symbol for it
PWWM	numeric past weather WMO code
Station Parameters
STID	character station identifier
STNM	station number
SLAT	station latitiude in degrees
SLON	station longitude in degrees
SELV	station elevation in meters
RANG	range in kilometers
AZIM	azimuth in kilometers
LATI	latitude in degrees from range/azimuth
LONG	longitude in degrees from range/azimuth
DELT	delta time in seconds
Model Output Statistics
MXMN	maximum or minimum temperature in Fahrenheit
TNTF	night temperature fcst in Fahrenheit
TNCF	night temperature climatology in Fahrenheit
TNAF	night temperature anomaly in Fahrenheit
TDYF	day temperature fcst in Fahrenheit
TDCF	fay temperature climatology in Fahrenheit
TDAF	day temperature anomaly in Fahrenheit
CL12	prevailing total sky cover fcst for a 12-hr period
SK12	maximum sustain surface wind spped fcst for 12-hr period
PP06	probability of precip fcst in 6-hr period
PP12	probability of precip fcst in 12-hr period
PP1C	probability of precipitation climatology in a 12-hr period
PP1A	probability of precipitation anomaly in a 12-hr period
PP24	probability of precipitation fcsr in a 24-hr period
PP2C	probability of precipitation climatology in a 24-hr period
PP2A	probability of precipitation anomaly in a 24-hr period
QP06	Quantitative precipitation fcst in a 6-hr period
QPX2	Maximum amount of precipitation in inches fcst in a 12-hr period. Values are same as QP12.
QP12	Quantitative precipitation fcst in a 12-hr period
QP24	Quantitative precipitation fcst in a 24-hr period
TS06	Unconditional probability of thunderstorms occurring in a 6-hr period
TS12	Unconditional probability of thunderstorms occurring in a 12-hr period
TS24	Unconditional probability of thunderstorms occurring in a 24-hr period
TC06	Unconditional probability of severe weather occurring in a 6-hr period
TC12	Unconditional probability of severe weather occurring in a 12-hr period
PCPT	Categorical forecast of precipitation
POZP	Conditional probability of freezing precipitation
POSN	Conditional probability of snow
SN06	Categorical forecast of snow amount falling in a 6-hr period
SN12	Categorical forecast of snow amount falling in a 12-hr period
SN24	Categorical forecast of snow amount falling in a 24-hr period
PZ12	Conditional probability of freezing precipitation in a 12-hr period
PS12	Conditional probability of snow in a 12-hr period
PR12	Conditional probability of mixed liquid/frozen precipitation in a 12-hr period
PC12	Categorical forecast of precipitation type in a 12-hr period
FCIG	Categorical forecast of ceiling height conditions
FVIS	Categorical forecast of visibility conditions
FVSA	Categorical forecast of visibility conditions (for new MOS)
OVIS	Categorical forecast in plain language of obstructions to vision
WXPB	Categorical weather precipitation probability or areal coverage determined by the precipitation parameter having the highest probability or areal coverage in WNUM.
TAF Parameters
TDRC	Temporary/probability wind direction in degrees
TSKN	Temporary/probability wind speed in knots
TGST	Temporary/probability wind gusts in knots
BRGK	Gust barb feathered in knots
TCHx	Temporary/probability numeric combined cloud height and coverage, as for CHCx
TCEL	Temporary/probability ceiling in hundreds of feet, as for CEIL
TSKC	Temporary/probability cloud coverage graphics symbol, as for SKYC
TXVF	Temporary/probability categorical identification of flight rules, as for XVFR
TWNM	Temporary/probability numeric weather code, as for WNUM
TWSY	Temporary/probability graphics weather symbol corresponding to TWNM, as for WSYM
TVSB	Temporary/probability visibility in statute miles
PPRB	Probability for TAF forecast change indicator
VWNM	Vicinity numeric weather code, as for WNUM
VWSY	Vicinity graphics weather symbol corresponding to VWNM, as for WSYM
TVWN	Temporary/probability vicinity numeric weather code, as for WNUM
WSKC	Worst case cloud coverage graphics symbol, as for SKYC
WXVF	Worst case categorical identification of flight rules, as for XVFR
TPWN	Temporary/probability/vicinity numeric weather code, as for WNUM
TPWS	Temporary/probability/vicinity graphics weather symbol corresponding to TPWN, as for WSYM
AWNM	Prevailing/temporary/probability/vicinity numeric weather code, as for WNUM
AWSY	Prevailing/temporary/probability/vicinity graphics weather symbol corresponding to AWNM, as for WSYM
LLWS	Low level wind shear forecast flag
MOTV	Mountain obscuration threshold value in hundreds of feet
CMSL	Ceiling converted to mean sea level in hundreds of feet
MOBS	Mountain obscuration threshold met indicator
TCMS	Temporary/probability ceiling converted to mean sea level in hundreds of feet
TMOB	Temporary/probability mountain obscuration threshold met indicator
WCMS	Worst case ceiling converted to mean sea level in hundreds of feet
WMOB	Worst case mountain obscuration threshold met indicator
TCTL	Temporary/probability low-level cloud genera from WMO Code 0513, as for CTYL
TCSL	Temporary/probability cloud graphics symbol for TCTL, as for CSYL
Marine Parameters
WHGT	Wave height in meters
WHFT	Wave height in feet
WPER	Wave period in seconds
HOWW	Height of wind wave in meters
POWW	Period of wind wave in seconds
HOSW	Height of predominant swell wave in meters
POSW	Period of predominant swell wave in seconds
DOSW	Direction of predominant swell wave in degrees
HOS2	Height of secondary swell wave in meters
POS2	Period of secondary swell wave in seconds
DOS2	Direction of secondary swell wave in degrees
WAV2	Combined wind wave period and height in feet ("2 group")
WAV3	Combined predominant and secondary swell wave direction in tens of degrees ("3 group")
WAV4	Combined predominant swell wave period and height in feet ("4 group")
WAV5	Combined secondary swell wave period and height in feet ("5 group")
WPHM	Combined wave period and height in half meters
WVSW	Combined swell wave direction, period and height in half meters
SWEL	Character combined swell wave direction, period and height in half meters
DAWV	Swell wave direction arrows of uniform length
IDTH	Thickness of ice on ship in meters
ROIA	Rate of ice accretion on ship from WMO Code 3551
IGRO	Rate of ice accretion on vessel in salt water in inches per three hours
DIGR	Character rate of ice accretion in inches per three hours
SHPD	True direction from which ship is moving (for 3 hours before obs) in degrees
SHPK	Ship's average speed (for 3 hours before obs) in knots
DASH	Ship's true direction arrows of uniform length
PMN1	Lowest 1-minute average pressure in previous hour in mb
PMNT	Time of lowest 1-minute average pressure, as hhmm
PKWD	Direction of 1-minute peak wind in previous hour in degrees
PKWK	Highest 1-minute mean wind speed in previous hour in knots
PKWS	Highest 1-minute mean wind speed in previous hour in m/sec
PKWT	Time of highest peak 1-minute wind in previous hour, as hhmm
BRPK	Wind barb (knots) for highest peak 1-minute wind
Aircraft Parameters
TURB	Amount of turbulence
TBSE	Base of turbulence in feet
TTOP	Top of turbulence in feet
HBOT	Base of turbulence in meters
HTOT	Top of turbulence in meters
FQOT	Frequency of turbulence
TPOT	Type of turbulence
TBSY	Graphics symbol for turbulence
ICNG	Amount of airframe icing
IBSE	Base of icing in feet
ITOP	Top of icing in feet
HBOI	Base of icing in meters
HTOI	Top of icing in meters
TPOI	Type of icing
ICSY	Graphics symbol for icing
WBSE	Base of weather in feet
WTOP	Top of weather in feet
HBWX	Base of weather in meters
HTWX	Top of weather in meters
CLC1	Numeric cloud coverage 1
CBS1	Cloud base 1 in feet
CTP1	Cloud top 1 in feet
CB1M	Cloud base 1 in meters
CT1M	Cloud top 1 in meters
CLC2	Numeric cloud coverage 2
CBS2	Cloud base 2 in feet
CTP2	Cloud top 2 in feet
CB2M	Cloud base 2 in meters
CT2M	Cloud top 2 in meters
ACRT	Aircraft report type
SELV	Flight level in meters
FELV	Flight level in hundreds of feet
ITSY	Icing type symbol
TTSY	Turbulence type symbol
TFSY	Turbulence frequency symbol
ACTP	Character aircraft type
ATP1	Numeric aircraft type
Miscellaneous Parameters
VSBY	Visibility in statute miles
VSBK	Visibility in kilometers
VSBN	Visibility in nautical miles
VSBF	Character visibility in fractions of statute miles for visibilities between 0. and 1.
VSBC	Character visibility in fractions of statute miles for all visibility numbers
PnnI	Precipitation over last nn hours in inches
PnnM	Precipitation over last nn hours in millimeters
DPRC	Character daily weather map precipitation in inches
PR24	Precipitation over last 24 hours in inches, as sum of four successive 6-hour precip amounts
SNOW	Snow depth in inches
SNEW	Amount of new snow in inches
SNRT	Forecast snow and ice pellet accumulation to watch threshold ratio
SI12	Forecast snow and ice pellet 12-h accumulation in inches
SNIP	Snow and ice pellet watch threshold in inches
FZRT	Forecast freezing rain accumulation to watch threshold ratio
FZ12	Forecast Freezing rain 12-h accumulation in inches
FZRN	Freezing rain watch threshold in inches
WEQS	Water equivalent of snow on the ground in inches
HAIL	Hail flag
HLSZ	Hail size in centimeters
DDEN	Density of dry air in kg/(m**3)	metpy.calc.density(mixing=0)
PSYM	Montgomery stream function in m**2/(100*s**2)	metpy.calc.montgomery_streamfunction
HEAT	Heat index in Fahrenheit	metpy.calc.heat_index
HMTR	Humiture (apparent temperature) in Fahrenheit
WCEQ	Wind chill equivalent temperature in Fahrenheit	metpy.calc.windchill
WCHT	Revised wind chill temperature in Fahrenheit
MSUN	Duration of sunshine in minutes
FFnn	Flash flood guidance for next nn hours in inches
TOST	Type of station (manned or automatic)
STIM	Report hour and minutes as hhmm
TEXT	Undecoded data
SPCL	Undecoded special reports
MARK	Markers
FOSB	Fosberg Index, also called Fire Weather Index
Spacing Parameters
BLNK	Plot a blank, not accounted for in FILTER
SPAC	Plot a space, accounted for in FILTER
Additional GEMPAK Parameters
ADDSTN	Logical variable which indicates whether stations which are in STNFIL, but not already included in the data file, should be added to the data file.
AFOSFL	The name of the AFOS graphics file to be displayed.
AIRM	The ending valid time for the airmet, the colors for the instrument flight rules, mountain obscuration, turbulence, icing, sustained winds and low-level wind shear, and flags for plotting symbols or airmet type, the end time, and the flight levels on the map.
ANLYSS	The average station spacing and the grid extend region.
ANOTLN	The line attributes for annotation.
ANOTYP	Specifies the fill type for annotation.
AREA	The data area. Only data within the area specified will be processed.
ASCT	The ending valid time for the AScat wind data, the speed intervals and colors, the wind barb size and width and plotting flags. Skip is a value that indicates how many rows and data points to skip when plotting. The flags include High Wind Speed, Low Wind Speed, KNMI Quality Control Fail, Redundant Data.
ASDI	The ending valid time for ASDI data, the mode of the display, the time increments (in minutes going back from the ending time) and the corresponding colors for the ASDI data.
ATCF	The initial time for the ATCF forecast tracks, the colors for each model track, the model names, flags for plotting the time, the storm name or number, the forecast wind speeds and markers at each forecast time, and an optional specific storm identifier.
AWPSFL	The name of the AWIPS graphics file to be displayed.
BND	Specifies the parameters needed for processing bounds areas.
BORDER	The color, line type and line width of the background and underground plot.
BOUNDS	Specifies the bound area(s) to consider when performing the graph-to-grid procedure.
BOXLIN	Line attributes for a box drawn around a region
BUFRFIL	The BUFR output file names.
CALIMG	Allows the user to select whether to use the calibration values supplied with an image, or raw pixel values.
CATMAP	A string that contains "label=value" pairs.
CBTOP	User estimated cloud top height in meters. The default value is 8000 m.
CENTER	Allows the GD2NDFD user to specify the originating or generating center ID and sub-center ID, as well as the Generating Process/Model ID.
CINT	The contour interval, minimum and maximum values and number of digits.
CLEAR	A logical variable which determines whether the graphics screen is cleared before plotting.
CLRBAR	Specifies the characteristics of a color bar associated with contour fill.
CNTRFL	The name of the file containing contour information.
CNTR	Specifies the plot attributes for Cell Centroid movement barbs (knots).
CNTRPRM	The SFPARM to contour.
COLORS	Specifies a list of color numbers.
COLUMN	Specifies the number of columns for plotting the contents of an ASCII text file specified by TXTFIL.
COMPRESS	A flag to determine whether the output will be written in compressed format.
CONTUR	Sets attributes for the contour algorithms.
CPYFIL	Identifies the location of the grid navigation and analysis information to be stored in a grid file, as well as an optional subarea.
CSIG	The ending valid time for the convective sigmet and convective outlook, the colors for the initial hour (0-hr) CSIG, extrapolated 1-hr CSIG, extrapolated 2-hr CSIG, and outlook, and flags for plotting the 0-hr CSIG sequence number, end time, direction/speed, flight level, intensity, 1-hr CSIG sequence number, and 2-hr CSIG sequence number on the map.
CTLFLG	A logical flag which indicates whether control characters are included in a raw surface data set to be decoded.
CTYPE	Specifies the contouring algorithms to use.
CURVE	A number corresponding to the method to be used to fit the curve.
CXSTNS	Defines the x-axis for a cross-section plot.
CYCLE	The cycle name tag put into the VGF files.
DATOUT	The date and time which will be assigned in the output file.
DATTIM	The date and time to be used by GEMPAK programs.
DELTAN	The average station spacing in degrees of latitude. The Barnes objective analysis programs use this number to compute weights for data interpolation.
DELTAX	The spacing between grid points in the x direction on CED grids. This value is in degrees longitude.
DELTAY	The spacing between grid points in the y direction on CED grids. This value is in degrees latitude.
DELZ	The user chosen average height difference between pressure levels to be used in the vertical interpolation. The default value is 500 m.
DESIRE	The value of the output vertical coordinate variable to which the input variables should be interpolated.
DEVICE	Specifies the graphics device.
DISCRETE	A string that contains "value1-value2=value3" pairs.
DITHER	Used to specify the plotting behavior of the reflectivity intensities.
DLINES	Indicates whether the direction of lines (order of points) should be taken into consideration when performing a graph-to-grid contour analysis.
DTAAREA	Defines the area over which station data will be input to the Barnes objective analysis.
ECHO	Specifies whether to plot the grid box intesities.
EDGEOPTS	An option which allows users to specify boundary conditions for the analysis.
EDR	Starts with the ending valid time for EDR data followed by corresponding colors for the EDR data over the time limit specified.
ENCY	The initial time for the ENCY forecast tracks, the colors for each model track, the model names, flags for plotting the time, the forecast pressures and markers at each forecast time.
EXTEND	Specifies the numbers of grid points beyond the GRDAREA which define the grid extend area in the Barnes objective analysis. The first pass is computed on the extend area to reduce edge effects on the GRDAREA.
FAXFIL	The name of a 6-bit FAX product.
FFA	The ending valid time for the flood watches, the colors for the flash flood and areal flood watches, a flag for plotting the start and stop times, a flag for plotting the zone names for the storms on the map, a flag for plotting the immediate cause for the flooding, and a flag to outline the zone.
FHOUR	The forecast hour, e.g., 18, or 24, which defines the "f" value in the BUFRFIL name.
FHR	The forecast hour of freezing levels. FHR can be a single hour or a range.
FILTER	A logical variable or real number which controls the filtering of data in order to eliminate plotting of overlapping data.
FILTYP	The filter type.
FINT	The contour fill interval, minimum and maximum values.
FLINE	The color and fill type to be used for contour fill.
FXYTBL	The FXY table file names.
G2DIAG	Allows for detailed GRIB2 message section information, entry-by-entry, to be printed out for selected GRIB2 messages.
G2DRT	Specifies the scaling and packing options when encoding the GRIB2 message.
G2IDS	A list of integers that are encoded into the GRIB2 Identification Section ( Section 1 ) that identifies the source and type of data packed in the GRIB2 message.
G2IS	A list of integers that are encoded into the GRIB2 Indicator Section ( Section 0 ) that identify the discipline and version of the GRIB2 message.
G2PDT	Can be used to specify any or all of the values in the Product Definition Template (PDT), describing the grid in the output GRIB2 message.
G2TBLS	Allows for specification of the GRIB2 decoding tables.
GAIRM	Makes provision to plot the G-AIRMET snapshots in 3-hour time bins.
GAMMA	The convergence parameter, is a multiplier for the weight and search radius for passes after the first pass of the Barnes analysis programs.
GAREA	The graphics area.
GBDIAG	Allows for detailed GRIB message section information, byte-by-byte, to be printed out for selected GRIB messages.
GBFILE	The name of the file which contains gridded data in GRIB messages.
GBTBLS	Allows for specification of the GRIB decoding tables.
GCENTER	Sets the center latitude-longitude on the ETA model domain.
GDATTIM	The date/time for the grid.
GDEFIL	The name of the grid edit file which will be used to update a grid file.
GDFILE	The name of the file which contains gridded data.
GDNUM	Allows the user to select grids by number.
GDOUTF	The output grid data file name.
GDOUTL	The output vertical level in the target vertical coordinate.
GDPFUN	Specifies a grid diagnostic function which yields either a scalar or vector quantity.
GFUNC	Specifies a grid diagnostic function which yields a scalar quantity.
GGLIMS	The parameter which controls the grid value limits and values.
GGVGF	The name of the VGF file.
GLEVEL	The vertical level for the grid.
GPACK	The packing type and the number of bits (or data precision) to be used to pack the grid data.
GPOINT	The grid location to be used for the plot.
GRDAREA	Specifies the area to be covered by the grid.
GRDHDR	A list of the valid grid header flags.
GRDLBL	The color number to be used in plotting the grid index numbers.
GRDNAM	The parameter name for the grid.
GRDTYP	The type of a diagnostic grid.
GSKIP	Allows the NDFDG2 user to specify a skip factor in order to reduce the resolution of the resulting GEMPAK grid.
GSPACE	Sets the grid spacing of the ETA model domain.
GUESFUN	Specifies one or more grid diagnostic functions that compute the first guess grid for a Barnes objective analysis.
GUESS	The name of the file which contains the first guess gridded data for objective analysis programs.
GVCORD	The vertical coordinate of the grid to be selected.
GVECT	Specifies a grid diagnostic function which yields a vector quantity.
GVOUTC	The vertical coordinate of the output grid.
HILO	Contains the information for plotting relative highs and lows.
HISTGRD	Toggles the writing of the graph-to-grid history grid to the GEMPAK grid file.
HLSYM	Defines the characteristics for the HILO symbols.
HRCN	The ending valid time for the tropical disturbance, the colors for the hurricanes, tropical storms, tropical depressions and directional arrows, the symbols for the hurricanes, tropical storms and tropical depressions, and flags for plotting the center located time, the name and minimum central pressure, the speed, the wind and sea quadrant radii, and the forecast track on the map.
IDNTYP	Sets character or numeric station identifiers to be used for input or output.
IJSKIP	Used to control subsetting of the internal grid by declaring bounding index values and numbers of points to skip in each index direction, I and J.
IMCBAR	Specifies the characteristics of a color bar for images.
IMGFIL	The name of an image file.
IMGTIM	The date and time to be used.
IMJM	Sets the number of grid points for workstation eta in the N-S and E-W direction.
INDXFL	The name of the file which contains the GRIB message header information.
INFO	The information needed to define the object to be plotted.
INTERP	A logical variable which determines whether interpolation between sweeps will occur.
ISIG	The ending valid time for the international SIGMET, the colors for the thunderstorms, turbulence, hurricanes, tropical storms, tropical depressions, volcanic ash clouds, marked mountain waves, tropical cyclones, squall lines, CAT, icing, hail, duststorms, sandstorms, cumulonimbus, and low level wind shear, flags for plotting symbols or storm names, the start and end times, the message id, the direction and speed, and the flight level or the central pressure and maximum wind speed associated with a tropical cyclone on the map.
KEYCOL	Indicates which contour lines to process.
KEYLINE	Indicates which contour lines to process based on VGTYPE and SUBTYP.
KXKY	Specifies the size of a grid as two numbers.
LAT	Specifies the latitude grid lines to be drawn.
LATLON	Specifies the latitude and longitude grid lines to be drawn.
LEVELS	Specifies the vertical levels to be extracted from the data set.
LINE	The color, line type, line width, line label frequency, smoothing separated by slashes, and flag to suppress small contours.
LOCI	The point(s) needed to place the object to be plotted.
LON	Specifies the longitude grid lines to be drawn.
LSTALL	A flag indicating whether the full contents of a file are to be listed.
LSTPRM	Specifies a field to list on the side of the display. Stations are added to the list if they are filtered from the map.
LTNG	The ending valid time for lightning data, the time increments (in minutes going back from the ending time) and the corresponding colors for the lightning data, and the positive and negative markers to display.
LUTFIL	Specifies a lookup table file name used to enhance the colors for satellite or radar images.
LVLINCR	Specifies the freezing level increment.
MAPFIL	The name(s) of the map file(s) to be used for maps drawn by GEMPAK programs.
MAP	The map color, line type and line width.
MARKER	Specifies the marker color, type, size, line width and hardware/software flag.
MAXGRD	The maximum number of grids that can be stored in the grid file being created.
MAXTOP	Specifies the color and filter attributes for cell top annotations (feet).
MESO	Specifies the plot symbol and filter attributes for mesocyclones.
MIXRLN	Specifies the color, line type, line width, minimum, maximum, and increment for the background mixing ratio lines on thermodynamic diagrams.
MRGDAT	A logical variable indicating whether sounding data is to be merged or unmerged.
MSCALE	Specifies the characteristics of a scale legend associated with map projections.
MXDPTH	The user estimated mixed layer depth in meters.
NCON	The ending valid time for the non-convective sigmet, the colors for the icing, turbulence, duststorm and sandstorm, and volcanic ash, and flags for plotting symbols, the end time, the message id, and the flight levels on the map.
NDVAL	The data value to be used where NIDS products report "ND" (none detected).
NPASS	Controls the number of passes for the Barnes objective analysis.
NTRACE	The number of traces to be drawn in SFGRAM.
OAATTR	Contains attributes to use for objective analysis in the graph to grid function.
OABND	Specifies the bounds file(s) to use for 'blocking'.
OAGUESS	Contains the information to use as a first guess for objective analysis in the graph to grid function.
OLKDAY	The day of the extended oulook.
OSCT	The ending valid time for the OScat wind data, the speed intervals and colors, the wind barb size and width and plotting flags.
OUTFIL	The name of an output satellite image file.
OUTPUT	Determines the output devices.
OVERWR	Allows the user to specify whether existing GEMPAK grids in a file should be overwritten or left unchanged.
PANEL	Specifies the panel location, panel outline color, line type and width.
PDSEXT	A logical flag which only becomes applicable when a PDS extension exists in the GRIB message.
PDSVAL	Provides a way to enter explicitly PDS numbers identifying a grid by parameter, level, vertical coordinate type, and time.
PIXRES	The input for how many pixels and lines to include in the new image.
PLUS	Specifies the size and width of a plus sign.
PMAX	Defines the maximum possible pressure from which data may be interpolated to the output vertical coordinate.
POSN	The position number and the format of the text to be used to plot data in GDMAP.
PRBTYP	Specifies the probability type.
PRECSN	The binary or decimal precision to be preserved in the packing of the gridded data.
PROJ	The map projection, projection angles, and margins.
PTYPE	The type of y axis plot to be used, the height-to-width ratio of the plot, and the margins.
QCNTL	The quality control threshold values.
QSCT	The ending valid time for the QuikScat or ambiguity wind data, the speed intervals and colors, the wind barb size and width and plotting flags.
RADDUR	The length of time (in minutes) prior to RADTIM for which data will be used in composites.
RADFIL	The name of a radar image file.
RADFRQ	tThe update frequency for RADAR composites.
RADINFO	Specifies the color for radar site operational status annotations.
RADIUS	The search radius (in meters) for which data will be considered.
RADMODE	Allows the user to select whether to include radar data from sites operating in (P) precipitation/storm mode, (C) clear air mode, and/or (M) maintainence mode.
RADPARM	The Radar parameter to be displayed.
RADTIM	The date and time to be used for RADAR composites.
RCMFIL	The RCM data file.
REFVEC	Specifies the size and location on the screen of the.reference arrow.
REGION	Specifies an areal location.
RESPOND	A logical variable indicating whether the user will respond interactively to GEMPAK programs.
ROTATE	The angle of rotation for the coordinate axes.
RTRAJ	A logical variable which determines whether the trajectory will start or end at the specified GPOINT.
SATFIL	The name of a satellite image file.
SCALE	The scaling factor for the data.
SEARCH	Controls the search radius in an objective analysis program.
SFEFIL	The name of the surface edit file to be used to update a surface file.
SFFILE	The name of the surface data file to be accessed.
SFFSRC	The surface file source.
SFOUTF	The output surface data file.
SFPARM	A list of surface parameters to be used in a surface program.
SFPRMF	Specifies the packing information for the surface file to be created.
SGWH	The ending valid time for the significant wave height data, the height intervals and colors.
SHAPE	The object that the user wishes to plot on the current graphics device.
SHIPFL	A logical variable which indicates whether the surface file contains stations which are not at a fixed location, such as moving ships, aircraft, or floating buoys.
SKIP	A variable which determines the contour points or plot points to skip.
SKPMIS	A logical variable which indicates whether non-reporting stations will be listed.
SNBUFR	The name of the BUFR model sounding file to be used as input to create GEMPAK sounding and surface data files using program NAMSND.
SNEFIL	The name of the sounding edit file to be used to update a sounding data file.
SNFILE	The filename for an upper air data set.
SNOUTF	The output sounding data file.
SNPARM	A list of upper air parameters to be used in an upper-air program.
SNPRMF	Specifies the packing formation for the sounding file to be created.
SOURCE	Indicates whether the data used to compute the average station spacing are to be read from a surface or sounding file.
SPLINE	A logical for using splines to interpolate the data to height levels.
SQUALL	The length of the squall line used for the air and moisture flux calculations.
STARTL	The level in the input data file at which to begin the search for the output vertical level in gdpvsf.
STAT	The issuing status of the GFA freezing levels.
STATION	The station to use in SFGRAM.
STNCOL	Specifies the color for the station identifier, time and the parameters specified in STNDEX.
STNDEX	The list of stability indices or station parameters for upper-air data.
STNFIL	The name of a file which contains station information which includes the character identifier, number, name, state, country, latitude, longitude and elevation for each station.
STNPLT	Allows the user to plot station markers and station information.
STNTYP	Used to select the data reporting characteristic of a station.
STOPL	The level in the input data file at which to end the search for the output vertical level in gdpvsf.
STREAM	Controls several parameters dealing with the overall streamline calculation and display.
STRMID	Specifies the storm identifier used by programs GPTPC and GPTCWW.
SVRL	The ending valid time for the SLS watches, the colors for the severe thunderstorm and tornado (SLS) watches, a flag for plotting the start and stop times, a flag for plotting the county names for the watches on the map, and a flag to outline the county.
SYSTEM	The system (storm) speed (m/s) and direction.
TAG	Used to identify a group of GFA FZLVL elements.
TAXIS	Contains the range, increment and location for labels on a time axis.
TCMG	The ending valid time for the tropical disturbance, the colors for the disturbance symbol, the arrows, and the storm danger area, and the name of the center issuing the graphic.
TEXT	The size, font, text width and hardware/software flag for graphics text.
THTALN	Specifies the color, line type, line width, minimum, maximum, and increment for the background dry adiabats (potential temperature lines) on thermodynamic diagrams
THTELN	Specifies the color, line type, line width, minimum, maximum, and increment for the background moist adiabats (equivalent potential temperature lines) on thermodynamic diagrams
TILT	The Radar beam elevation/tilt angle.
TIMSTN	Contains the maximum number of times to include in a file and the number of stations to be included in addition to the stations in STNFIL.
TITLE	The title color, title line, and title string.
TOPOFL	The topographic input file.
TRACE	Specifications for each trace on the meteogram.
TRAK	The ending time for the Altimetric Satellite Ground Track Prediction data, and the color of the prediction.
TROPHT	The user estimated tropopause height in meters.
TRPINT	The user chosen distance above (and below) the tropopause which is used for layer calculations.
TSTEP	Specifies the time step, in minutes, for the calculation of updated position of the parcel within the grid domain.
TVS	Specifies the plot symbol and filter attributes for tornado vortex signatures.
TXTCOL	Specifies the color number for text, NOAA or NWS logo.
TXTFIL	Specifies an ASCII text file to be read and displayed to the current device driver.
TXTLOC	Specifies the start location for plotting the contents of an ASCII text file specified by TXTFIL.
TXTYPE	Specifies the text attributes.
TYPE	Specifies the processing type for the GDPLOT2 GDPFUN parameter.
UKAFIL	The intermediate input/output ASCII file.
VCOORD	Specifies the vertical coordinate system of the levels to process.
VERCEN	Allows the GDGRIB user to specify the contents of bytes 4, 5, 6, and 26 of the GRIB PDS.
VGFILE	The name of the Vector Graphics File (VGF) to be displayed or processed.
WARN	The ending valid time for the warnings, the colors for the severe thunderstorm, tornado and flash flood warnings, a flag for plotting the start and stop times, a flag for plotting the county names for the warning on the map, a flag to outline the county, and a flag to plot warning polygon.
WATCH	The ending valid time for the watches, the colors for the severe thunderstorm and tornado watches and a flag for plotting the start and stop times for the watch on the map.
WAVLEN	the wavelength for the gravity or lee wave in kilometers.
WAVSPD	The wave speed in m/s. This is used for calculating the SCORER parameter.
WCN	The ending valid time for the watch county notification(WCN), the colors for the county bounds, a flag for plotting the start and stop times, a flag for plotting the county names for the WCN on the map, a flag to outline the county or union, a flag to fill the county or union, and a union flag.
WCP	The ending valid time for the watches, the colors for the severe thunderstorm and tornado watches and flags for plotting the start and stop times and watch numbers for the watches on the map.
WEIGHT	The Barnes weighting parameter.
WIND	Specifies the wind symbol, size, width, type, and head size.
WINPOS	Specifies the position for plotting winds for vertical profile plots.
WMOHDR	Allows specification of a WMO header for a GRIB message.
WOU	The ending valid time for the watch outline update (WOU), the colors for the county bounds, a flag for plotting the start and stop times, a flag for plotting the county names for the WOU on the map, a flag to outline the county or union, a flag to fill the county or union, and a union flag.
WSAT	The ending valid time for the WindSAT wind data, the speed intervals and colors, the wind barb size and width and plotting flags.
WSPDA	The ending valid time for the Altika wind speed data, the speed intervals and colors, and time stamp intervals and colors.
WSPDALT	The ending valid time for the altimeter-derived wind speed data, the speed intervals and colors, and time stamp intervals and colors.
WSTM	The ending valid time for the winter storms, the colors for the storm warning, watch and advisory, a flag for plotting the start and stop times, a flag for plotting the zone names for the storms on the map, and a flag to outline the zone.
XAXIS	Contains the left bound, right bound, label increment, and frequency information.
YAXIS	Contains the lower bound, upper bound, label increment, and frequency information.