surface-based lifted index
(Abbreviated SBLI.) A stability index
that is identical to the lifted index
(LI) except that it modifies the standard 1200 and 0000 UTC
soundings or numerical-model soundings
by incorporating hourly surface observational data, and the characteristics of the lifted parcel
are from surface values of temperature
The advantage of this index is that it can be computed at hourly intervals and it typically reflects short-term changes in the boundary layer
. The surface-based lifted index is typically more unstable than the LI. As with the LI, thunderstorms
become increasingly likely the further the surface- based lifted index decreases below a threshold of zero.
Hales, J. E., Jr., and C. A. Doswell III 1982. High-resolution diagnosis of instability using hourly surface- lifted parcel temperatures. Preprints, 12th Conf. on Severe Local Storms. 172–175.
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