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Much of northern Oklahoma had this view last Thursday evening, 6/27/13, of a approaching shelf cloud with a gust front with winds typically in the 40-60 mph range. Notice the upper portion showing pancaking layers of the clouds. They are believed caused by very strong upper level winds, interfering with the updrafts. The picture only shows the right end of the entire cloud formation that spread from west to north. Storm was probably traveling about 50 mph.
Shelf clouds are awesome weather sights. Let's see examples of some more, hopefully even more spectacular looking.
I took this shot a few weeks back, here in NC. We had 50-60 mph wind gusts a few minutes after I took the photo which lasted for about 10-15 minutes.
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