#2354 "April Cumulus Flurries"

The cold and unstable air mass was still producing very vigourous snow flurries. This convective sky was full of shapes. The cloud had some real structure to it. The brisk westerly winds at the surface produced pronounced Langmuir streets in the water. Friction in the boundary layer veered these surface winds more to the northwest at the higher level of the cumulus clouds. Meteorologists refer to this as the Ekman Spiral.

Ekman Spiral showing winds typically veer about 45 degrees
with height due to friction in the boundary layer

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