Rayleigh(mode)

The Rayleigh distribution results when you have two orthogonal components that are each normally distributed, such as might be the case with Wind Speed. The length of the vector itself will then have a Rayleigh distribution.

The Rayleigh is a special case of the Weibull distribution -- Weibull(2,sqrt(2)*mode). It also coincides with Chi-Squared, conditional exponential, and the Rice distributions.