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Energy Helicity Index (or EHI) - An index that incorporates vertical shear and instability, designed for the purpose of forecasting supercell thunderstorms.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Energy Helicity Index, Hook Echo, HP Storm, LP Storm, Supercell, Supercell Thunderstorm, Tilted Storm, Tilted Updraft ...
 See also: Cloud, Supercell, Thunder, Jet Stream, Storm
  
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