Helicity - A property of a moving fluid which represents the potential for helical flow (i.e. flow which follows the pattern of a corkscrew) to evolve.
HELICITY
A property of a moving fluid, such as air, representing the potential for helical flow (flow that follows a corkscrew pattern).
HELICITY- Streamwise vorticity available for ingestion into a thunderstorm. Higher values are favorable for a rotating updraft (greater than 400).
Energy Helicity Index (or EHI) - An index that incorporates vertical shear and instability, designed for the purpose of forecasting supercell thunderstorms.
Helicity has units of energy and can therefore be interpreted as a measure of wind shear energy that includes the directional shear.
HELICITY - Measure of the tendency of a rising parcel of air to twist as it rises in the atmosphere. Wind patterns which change direction with height in the lower atmosphere result in high helicity values.
SRH An acronym for Storm-relative Helicity.
Stability Index The overall stability or instability of a sounding is sometimes conveniently expressed in the form of a single numerical value.
Measured relative to a moving thunderstorm, usually referring to winds, wind shear, or helicity.
Storm-scale
Referring to weather systems with sizes on the order of individual thunderstorms - generally around 10 km. See synoptic scale, mesoscale.
Storm-relative - Measured relative to a moving thunderstorm, usually referring to winds, wind shear, or helicity.
Storm-scale - Referring to weather systems with sizes on the order of individual thunderstorms. See synoptic scale, mesoscale.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Equilibrium Level, Helicity, MLCAPE, Positive Area, Precision, REP, SBCAPE
Capillarity - permalink - collapse
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Increasing values of CAPE generally lead to progressively vigorous convection. However, severe thunderstorms can form in environments showing weak to moderate CAPE, especially if the Storm Relative Helicity values are high.
 See also: Storm, Thunderstorm, Air, Radar, Thunder
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