Extreme Storms

Storm report

Lifted Index

· by Jimmy Deguara

(or LI) A common measure of atmospheric instability. Its value is obtained by computing the temperature that air near the ground would have if it were lifted to some higher level (around 18,000 feet, usually) and comparing that temperature to the actual temperature at that level. Negative values indicate instability – the more negative, the more unstable the air is, and if thunderstorms develop they are more likely to be stronger.

Also on 9 November

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