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Greetings! MetPy has a storm_relative_helicity calculation, on which you specify a custom depth: https://unidata.github.io/MetPy/latest/api/generated/metpy.calc.storm_relative_helicity.html Unfortunately, this does not currently support being given full 3D grids as input, only a single 1D profile, so you'll need to loop over the grid points in order to use it on gridded GFS output. Addressing this limitation is definitely in our medium-term plans, though. Cheers! Ryan > Hello > > I would like to calculate the 0-3km SRH for gridded GFS data. > I see there is a 0-1.5km SRH variable but not 0-3km. > Is there an efficient way to calculate the 0-3km SRH? Ticket Details =================== Ticket ID: VSF-738863 Department: Support Python Priority: Low Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.