WINDEX Calculator

WINDEX (WI) is computed as follows:

windex equation

Enter values for the following variables, then click Calculate.

HM = height of the melting level = (km)
QL = mean mixing ratio in lowest 1 kilometer = (g/km)
QM = mixing ratio at melting level = (g/km)
tau = Lapse rate from melting level to surface = (°C/km)

WI = = maximum wind gust (knots)