(SWI) A basic and somewhat simplistic measure of atmospheric instability, used to determine the likelihood of severe thunderstorms. Named after the meteorologist who developed the derived parameter from his research into thunderstorms, published in 1953.
A stability index used to determine thunderstorm potential. The SWI is calculated by lifting an air parcel adiabatically from 850 mb to 500 mb.
The algebraic difference between the air parcel and the environmental temperature at 500 mb represents the SWI.
It is especially useful when you have a shallow cool airmass below 850 mb concealing greater convective potential aloft. However, the SWI will underestimate the convective potential for cool layers extending above 850 mb. It also does not take in account diurnal heating or moisture below 850 mb. As a result, one must be very careful when using this index.
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