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The CAPE-shear EFI may be used to anticipate well-organised severe thunderstorms.   Strong wind shear but relatively modest CAPE (e.g. a few hundred J kg-1) well-organised severe thunderstorms can develop but EFI for CAPE will give a much weaker signal than the EFI for CAPE-shear.  Extremely severe thunderstorms show high CAPE and high shear; therefore both EFIs for CAPE and CAPE-shear should show a strong signal.


Fig2Fig2154.1.23A: Rough guidelines on how to use CAPE and CAPE-shear (EFI) values together. Bear in mind also that EFI and SOT are computed relative to reference model climatologies, so "severe" in one region will tend not be at the same level as it is in another.

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