Check out the mammatus cloud images here:
http://spaceweather.com/
MAMMATUS CLOUDS: Yesterday in the Czech Republic, Matus Kocka photographed some "very strange clouds" hanging over Brno where he is going to college:
These are mammatus clouds. They form in turbulent air on the undersides of thunderstorms. Although mammatus clouds are popularly thought to signal the approach of severe weather, new research shows the opposite is true. These lumpy clouds are most often seen when storms are breaking up. Indeed, Kocka photographed these "after some strong weather" swept through Brno. More images: #1, #2, #3, #4
Unsolicited advice: the next time you step outside after a storm, look up and around for mammatus clouds.
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More cloud photos