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CAPE Index

Convective Available Potential Energy

(Joules/Kg)

Green: 0 - 500 J/Kg

Red: 2001-3000 J/Kg

Yellow: 501-1000 J/Kg

Violet: 3000+ J/Kg

Orange: 1001-2000 J/Kg

Lifted Index
(Degrees Celsius)

Light Blue

Lifted Index 6 or Greater, Very Stable Conditions

Green

Lifted Index Between 1 and 6 : Stable Conditions, Thunderstorms Not Likely

Yellow

Lifted Index Between 0 and -2 : Slightly Unstable, Thunderstorms Possible, With Lifting Mechanism (i.e., cold front, daytime heating)

Orange

Lifted Index Between -2 and -6 : Unstable, Thunderstorms Likely, Some Severe With Lifting Mechanism (i.e., cold front, daytime heating)

Red

Lifted Index Between -6 and -10: Highly Unstable, Severe Thunderstorms Likely With Lifting Mechanism (i.e., cold front, daytime heating)

Violet

Lifted Index Less Than -10: Extremely Unstable (i.e., cold front, daytime heating)