Associated Press
This NOAA satellite image taken Sunday, May 6, 2012 at 1:45 a.m. EDT shows clouds pop up across the Central US as a trough of low pressure strengthens in the Plains. This system pulls moisture and energy in from the Gulf of Mexico and creates a warm front that produces severe thunderstorms across the Upper Midwest.  At the same time, a cold front stretches southward from this system, bringing showers and thunderstorms to the Southern Plains as it moves eastward throughout the day.  (AP PHOTO/WEATHER UNDERGROUND)

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