Left Supercell Composite Parameter

A multiple ingredient, composite index that includes effective storm-relative helicity (ESRH, based on Bunkers left 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 negative values of LSCP are displayed, which correspond to environments favoring left-moving (anticyclonic) supercells.

This index is formulated as follows:

LSCP = (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.

Additional information can be found here. (Please open this link in another browser window.)