showalter_index

metpy.calc.showalter_index(pressure, temperature, dewpoint)

Calculate Showalter Index.

Showalter Index derived from [Galway1956]: SI = T500 - Tp500

where: T500 is the measured temperature at 500 hPa Tp500 is the temperature of the parcel at 500 hPa when lifted from 850 hPa

Parameters

• pressure (pint.Quantity) – Atmospheric pressure, in order from highest to lowest pressure

• temperature (pint.Quantity) – Ambient temperature corresponding to pressure

• dewpoint (pint.Quantity) – Ambient dew point temperatures corresponding to pressure

Returns

pint.Quantity – Showalter index

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