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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 EFI and CAPE-shear EFI should show a strong signal.
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