From: http://www.weatherpix.com - A strong tornado churns across farmland near Woonsocket South Dakota on June 24th, 2003. This storm was part of a weather system that spawned the largest single-day outbreak of tornadoes in the state's history.
We were astonished at the variation in the look of tornadoes south of Matheson, Colorado. The rapidity of change, including strengthening and weakening. This tornado is a spectacular example of a rapidly strengthening anticyclonic circulation. 4th June 2015
Shelf Cloud Unlike roll clouds, shelf clouds are attached to a larger parent cloud. But, like the roll cloud it, too, is an arcus cloud. They are often enormous and frequently forewarn the coming of a big storm, whereas roll clouds typically do not precede bad weather. Shelf clouds can falsely give the appearance of being a wall cloud (which comes after a storm) but a shelf cloud usually has a ragged bottom.
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