End TimesDoesn't this photograph evoke Judgment Day? This shot of a Montana supercell, which is today's home page for the Bing search engine, is part of a series of photographs from a National Geographic 2010 contest, which you can find here.
The NOAA explains that most supercells will produce some ugly weather, but only about a third will mature into a tornado. This kind of impressive rotation is associated with the head-on collision of cold air and warm air along a front, which results in a kind of breaking-wave effect, as shown in this graphic:
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