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                   Tuesday, August 16, 2011 - 8:50AM CDT

Steam devils near Mascoutah, IL - August 16

By DAN ROBINSON
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25 Years of Storm Observing
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A nice surprise this morning - I passed this lake on Highway 161 in Mascoutah, as I do every day - but this time it was full of dozens of steam devils (fog devils). These are small vorticies that spin up when warm waters are present during cooler temperatures and calm winds (we were down to 57°F this morning). After I pulled over, they only lasted for another two minutes before the sun began rapidly burning off the fog. I was able to catch a couple of decent ones before they were gone.

Steam devil 1
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Steam devil 2
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Steam devil 3
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Steam devil 4
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