Skew-T Procedure

Skew-T procedure to determine lifted index (LI)
  1. Find the mean temperature (T) and dewpoint (Td) in the lowest 100 hPa.
  2. From those mean T and Td, located at the midpoint of the layer, 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), LI is computed as follows:

LI = T500 - T′

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