bunkers_storm_motion#

metpy.calc.bunkers_storm_motion(pressure, u, v, height)#

Calculate right-mover and left-mover supercell storm motions using the Bunkers method.

This is a physically based, shear-relative, and Galilean invariant method for predicting supercell motion. Full atmospheric profiles of wind components, as well as pressure and heights, need to be provided so that calculation can properly calculate the required surface to 6 km mean flow.

The calculation in summary is (from [Bunkers2000]):

surface to 6 km non-pressure-weighted mean wind
a deviation from the sfc to 6 km mean wind of 7.5 m s−1
a 5.5 to 6 km mean wind for the head of the vertical wind shear vector
a surface to 0.5 km mean wind for the tail of the vertical wind shear vector

Parameters

pressure (pint.Quantity) – Pressure from full profile
u (pint.Quantity) – Full profile of the U-component of the wind
v (pint.Quantity) – Full profile of the V-component of the wind
height (pint.Quantity) – Full profile of height

Returns

right_mover ((pint.Quantity, pint.Quantity)) – Scalar U- and V- components of Bunkers right-mover storm motion
left_mover ((pint.Quantity, pint.Quantity)) – Scalar U- and V- components of Bunkers left-mover storm motion
wind_mean ((pint.Quantity, pint.Quantity)) – Scalar U- and V- components of surface to 6 km mean flow

Notes

Only functions on 1D profiles (not higher-dimension vertical cross sections or grids). Since this function returns scalar values when given a profile, this will return Pint Quantities even when given xarray DataArray profiles.

Changed in version 1.0: Renamed heights parameter to height

bulk_shear

cape_cin