![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHQtVnKD3kPZNMVInWy7YjJxYQvZmexMfa-B4Ge3_QFNTkCAARRCSIu49NT93Xfye1Wnnen2YGs0zX8VzwYgAqxZa96l6E2ep21gul1-ccU03KvWrlP5XdlUdU5eGhjgWjKDNRjw/s280/Thunderstorm.jpg)
Doesn'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:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7Spv0plpsYn5bgCMZpHLVN4IgzXCUJ_TGXtbpZcKTHYaiaLABwy0p9IHhTmJLiF3uZpy8iR6-lC4SHq16fqrS_-FW8MsNU8sv3j2PmCmw5Kwv0Rzot1NkiDYdHru5bULrhpCapA/s280/StormBreakingWaveGraphic.gif)
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