* ML100 CAPE = conservative estimate of CAPE, lifting an average parcel in the bottom 100 hPa of a sounding.

Maps of CAPE on the internet = surface-based CAPE (or SBCAPE) which starts in lowest 2 meter.

Convert SBCAPE to ML100 CAPE with estimation table below

EHI    0.00 to 0.34  (mean = 0.14) : ordinary cell
EHI    0.20 to 1.46  (mean = 0.64) : supercell (F0, F1 tornadoes)
EHI    0.42 to 2.87  (mean = 1.48) : supercell (= > F2 tornadoes)

Tests on the field (in the States) showed there is no good correlation between EHI values and severe weather events.

Formula used : (ML100 CAPE x SREH) / 160000