This NOAA satellite image taken Wednesday, May 18, 2011 at 1:45 a.m. EDT shows a low pressure system in the Mid-Atlantic, which is producing broken to overcast clouds east of the Ohio Valley with rain... more 
This NOAA satellite image taken Wednesday, May 18, 2011 at 1:45 a.m. EDT shows a low pressure system in the Mid-Atlantic, which is producing broken to overcast clouds east of the Ohio Valley with rain and scattered thunderstorms. In the Plains, moisture ahead of a Pacific system is moving into the region. (AP PHOTO/WEATHER UNDERGROUND) less 
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Associated Press
Wed, May 18, 2011 2:28 AM EDT