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
- ^ “Mesoscale Parameters”. National Weather Service. Retrieved 2026-05-04.
- ^ “Climatology of the Supercell Composite Parameter (1979–2004)” (PDF). Oklahoma University. August 5, 2005. p. 2. Retrieved May 4, 2026.
- ^ a b “Utility of Severe Weather Parameters and Indices” (PDF). National Weather Service. 2017. pp. 28–29. Retrieved May 4, 2026.