The convective available potential energy or CAPE, is used by weather officials and storm chasers to understand what the potential might be for severe weather, and how powerful those storms might become if they do materialize. You may think that CAPE measurements and predictions of storm power are a subjective thing, like Medifast reviews for example, but that's not actually the case. The potential energy available for convection is expressed mathematically using a standard measurement of energy represented as Joules Per Kilogram. A high CAPE value might also be expressed by storm chasers and weather experts by using the term "high instability". When chasers talk about a highly unstable atmosphere, CAPE values are usually in excess of 2500 J/kg's which would supply ample energy for strong updrafts and violent storms should they develop.