A storm system brewing over the Midwest threatened tens of millions of people Wednesday with heavy rain, hail and perhaps even a derecho — a rare, explosive wind pattern that forecasters compare to the landfall of a hurricane.
Chicago, Detroit and Cleveland were all in the threat zone, with Pittsburgh, Baltimore and Washington at risk of severe storms on Thursday.
The system, the product of hot air streaming up from the south and atmospheric churning over Minnesota, was certain to bring ugly weather. Forecasters said it was trickier to predict whether it would produce the little-known phenomenon of a derecho.
http://usnews.nbcnews.com/_news/2013/06/12/18918028-storm-system-threatening-millions-in-midwest-could-spawn-feared-derecho?lite
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