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Very strong winds aloft cause building cumulus towers to build at a 45 degree angle instead of straight up.
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The differing speeds and directions of the winds aloft compared to the winds closer to the surface caused these clouds to rotate. As these rotating clouds built higher, they spun faster (think of a spinning figure skater raising their arms), which caused this small funnel cloud to form.
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A contrast enhanced look at the funnel. Funnels in small cumulus clouds such as these are not known to have circulations capable of damage occurring at the surface, and therefore are not tornadoes.
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