Earth:Supercell composite parameter

From HandWiki
Short description: American thunderstorm prediction index
A map of the United States, with contours in blue representing the SCP and black tornado tracks representing EF5-rated tornadoes
The supercell composite index on April 27, 2011, overlaid with tracks of EF5-rated tornadoes (in black)

The Supercell Composite Parameter, often abbreviated as SCP, is a multi-parameter index used by the Storm Prediction Center that outlines areas of the United States where the development of supercell thunderstorms is favorable.[1] The parameter uses convective available potential energy, storm relative helicity and vertical wind shear to determine specific areas.[2] A value of 1 indicates a normal atmosphere while values above two are conducive for supercells.[3]

Equation

Two equations can be used to conclude the supercell composite for an area:[3]

SCP = (MUCAPE/1000 J/Kg^-1) x (0-3 km SRH/150 m^2s-^2) x (BRN denominator/40 m^2s-^2)

SCP = (MUCAPE/1000 J/Kg^-1) x (Effective shear/20 m^2s-^2) x (Effective SRH/50 m^2s-^2)

See also

References