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Convective Inidices

Convective Indices Help

CAPE = Convective Available Potential Energy.

A measure of instability through the depth of the atmosphere, and is related to updraft strength in thunderstorms.

Weak instability: < 1000
Moderate instability: 1000-2500
Strong instability: 2500-4000
Extreme instability: > 4000

CIN = convective inhibition.

Represents the “negative” area on a sounding that must be overcome for storm initiation.

LI = Lifted Index

The temperature difference between the 500 mb temperature and the temperature of a parcel lifted to 500 mb. Negative values denote unstable conditions.

Theta-e

The higher the value the more unstable. Higher Theta‑e values indicate a greater chance for positive buoyancy. Severe weather and excessive rainfall often occur near or just upstream from a Theta‑e ridge

> 2: Conv Activity Unlikely
0 to 2: Stable
-3 to 0: Marginally Unstable
-4 to -6: Moderately Unstable
-7 to -9: Very Unstable
< -9: Extremelt Unstable

SRH = Storm Relative Helicity

A measure of the potential for cyclonic updraft rotation in right-moving supercells, and is calculated for the lowest 1-km and 3-km layers above ground level. Larger values of 3km SRH (greater than 250 m? s-2) and 0-1 km SRH (greater than 100 m s-3) suggest an increased threat of tornadoes with supercells.