Showalter Index is a measure of thunderstorm potential and severity. Especially useful when a shallow, cool layer of air below 850 mb conceals greater convective potential above.
> 4 | Stable.Thunderstorms Unlikely |
1 to 3 | Marginally unstable. Thunderstorms possible.- trigger needed |
-2 to 0 | Moderately unstable. Increasing Chance of Thunderstorms. |
-3 to -2 | High Potential of Thunderstorms |
-5 to -4 | Very unstable. |
-10 to -6 | Extremely unstable. |
< -10 | Run For Your Life. |
Lifted Index (LI) | CAPE | K-Index | CIN | SWEAT | Total Totals |