Skew-T Procedure

Skew-T procedure to determine Showalter stability index
  1. Find the temperature (T) and dewpoint (Td) at 850 hPa
  2. From that T and Td, find the LCL
  3. From the LCL lift the parcel moist adiabatically to 500 hPa and find the parcel temperature (T′).
  4. Given the 500 hPa sounding temperature (T500), SSI is computed as follows:
SSI = T500 - T′
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