Mammatus Above Brookfield

August 29, 2005

Aug18mammatus copy

Provided and copyright by: Sheila Halberg
Summary authors & editors: Jim Foster; Sheila Halberg

The photo above showing eerie looking mammatus clouds was taken just before a severe storm ripped through Brookfield, Wisconsin on August 18, 2005. This particular storm produced multiple tornadoes and torrential rains, causing extensive damage. Mammatus are typically caused by down-drafts of cold air within mature thunderstorm cells. These pendulous clouds don't produce severe weather nor are they always, or even often, a precursor of nasty storms. Nevertheless, when they take the form shown above, they always get your attention.

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