This sounding comes from the vicinity of a mesoscale convective system in north Texas on 6 May 2003.
Determine the Showalter stability index (SSI).
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Answer: -3
From the dewpoint and temperature at 850 hPa, find the
LCLLCL.
From the LCL, follow a
saturation adiabatsaturation adiabat up to 500 hPa.
The temperature where the saturation adiabat crosses the 500 hPa isobar = T′ = -7°C.
The temperature of the environment at 500 hPa = T500 = -10°C.
SSI = T500 - T' = -10 -(-7) = -3