The positive area on a sounding is proportional to the amount of CAPE. The higher the positive area, the higher the CAPE. The positive area is that area where the parcel sounding is to the right (warmer) than the environmental sounding. The units of CAPE are Joules per kilogram (energy per unit mass). The sounding at the bottom of this page shows a CAPE value of 2,032 Joules per kilogram.