Supercell Composite Parameter
A multiple ingredient, composite index that includes effective storm-relative
helicity (ESRH, based on Bunkers right supercell motion), most unstable parcel
CAPE (muCAPE), and effective bulk wind difference (EBWD). Each ingredient is
normalized to supercell "threshold" values, and larger values of SCP denote greater
"overlap" in the three supercell ingredients. Only positive values of SCP are
displayed, which correspond to environments favoring right-moving (cyclonic)
supercells.
This index is formulated as follows:
SCP = (muCAPE / 1000 J kg-1) * (ESRH / 50 m2 s-2) * (EBWD / 20 m s-1)
EBWD is divided by 20 m s-1 in the range of 10-20 m s-1. EBWD less than 10 m s-1
is set to zero, and EBWD greater than 20 m s-1 is set to one.