FLVL - the level at which to calculate the frontogenesis. You must use small letters. This will calculate the 850 mb frontogenesis, potential vorticity, and potential vorticity advection in the 350 to 450 mb layer. This will calculate the 900 mb frontogenesis, and the potential voriticity and potential vorticity advection in the 250 to 350 mb layer. Frontogenesis - Thick, white lines.
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