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Calculate WINDEX
Melting Level Height: km

Lapse Rate (surface to melting level): °C/km

Mean Mixing Ratio Lowest 1 km: g/km

Melting Level Mixing Ratio: g/km

WINDEX Units: mph kts kphm/s

WINDEX:

Equations:

Equations to Calculate WINDEX

In the above equation, WI is the WINDEX in knots, HM is the height of the melting level in kilometers, QL is the mean mixing ratio over the lowest 1 kilometer in grams per kilogram, Γ is the lapse rate from the surface to the melting level in °C per kilometer, and QM is the mixing ratio at the melting level in grams per kilogram.