Today was a good example here for wind behavior in a valley on a typical fair weather day showing the reversal in direction( at least here , because the valley runs N.W.-S.E.) Opposite behavior at late evening. Night temps are generally lower as well on calm nights because of pooling of cooler air.
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it does pick up the wind direction and speed very well for very light winds
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That’s one of the benefits of the sonic anemometer vs spinning cups: lower cut-in speed due to minimal inertia/friction.
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