EA: ATM_HELICITY_INDEX
Status:
SUBM 2009/06/04
Concept definition:
An index that incorporates vertical shear and instability, designed for the purpose of forecasting supercell <
THUNDERSTORM
>s, and is related directly to <<
STORM_RELATIVE_HELICITY
>> in the lowest two kilometres and <<
CONVECTIVE_AVAILABLE_POTENTIAL_ENERGY
>> by the equation (<<
CONVECTIVE_AVAILABLE_POTENTIAL_ENERGY
>> × <<
STORM_RELATIVE_HELICITY
>>)/160 000; atmospheric helicity index.
Attribute value type:
REAL
Unit equivalence class label:
PURE_NUMBER
Reference type:
IR
Reference:
[
NWS145
]
Supplemental references:
[
JMBL
, "helicity energy index"]
Group membership:
ATMOSPHERE
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