Calculate the level of free convection (LFC).
This works by finding the first intersection of the ideal parcel path and
the measured parcel temperature. If this intersection occurs below the LCL,
the LFC is determined to be the same as the LCL, based upon the conditions
set forth in [USAF1990], pg 4-14, where a parcel must be lifted dry adiabatically
to saturation before it can freely rise.
pressure (pint.Quantity) – Atmospheric pressure
temperature (pint.Quantity) – Temperature at the levels given by pressure
dewpoint (pint.Quantity) – Dewpoint at the levels given by pressure
parcel_temperature_profile (pint.Quantity, optional) – The parcel’s temperature profile from which to calculate the LFC. Defaults to the
surface parcel profile.
dewpoint_start (pint.Quantity, optional) – Dewpoint of the parcel for which to calculate the LFC. Defaults to the surface
which (str, optional) – Pick which LFC to return. Options are ‘top’, ‘bottom’, ‘wide’, ‘most_cape’, and ‘all’;
‘top’ returns the lowest-pressure LFC (default),
‘bottom’ returns the highest-pressure LFC,
‘wide’ returns the LFC whose corresponding EL is farthest away,
‘most_cape’ returns the LFC that results in the most CAPE in the profile.
pint.Quantity – LFC pressure, or array of same if which=’all’
pint.Quantity – LFC temperature, or array of same if which=’all’
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 dewpt,``dewpoint_start`` parameters to dewpoint, dewpoint_start