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Equations:
In the above equation, WI is the WINDEX in knots, H_{M} is the height of the melting level in kilometers, Q_{L} 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 Q_{M} is the mixing ratio at the melting level in grams per kilogram.