Wind Speed from Wind Chill and Temperature
The inverse of the wind-chill tile: the wind speed that produces a target or reported wind chill at a known air temperature, w = [ (WC - 35.74 - 0.6215 T) / (0.4275 T - 35.75) ]^(1/0.16) from the NWS 2001 formula. At 5 F air, a -19 F wind chill implies about a 30 mph wind. Valid for T <= 50 F and w >= 3 mph (below 3 mph the ambient temperature governs). A felt-temperature reference; the NWS advisory governs.
Formula and source
w = [ (WC - 35.74 - 0.6215 T) / (0.4275 T - 35.75) ]^(1/0.16), the inverse of the NWS 2001 wind chill WC = 35.74 + 0.6215 T - 35.75 w^0.16 + 0.4275 T w^0.16 (T in F). Valid for T <= 50 F and w >= 3 mph.
NWS Wind Chill Temperature Index, 2001 revision, solved for the wind speed.
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