Mammatus Above Brookfield
August 29, 2005
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 downdrafts 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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