This NOAA satellite image taken Sunday, March 18, 2012 at 1:45 a.m. EDT shows clouds cover parts of the Eastern US and Southern Plains as warm and humid conditions allow for thunderstorms to develop. Flow from the south pulls ample moisture and warm air in from the Gulf of Mexico. This produces periods of severe thunderstorms, in addition to maintaining unseasonably warm temperatures across the Central and Eastern US. (AP PHOTO/WEATHER UNDERGROUND)

Associated Press
This NOAA satellite image taken Sunday, March 18, 2012 at 1:45 a.m. EDT shows clouds cover parts of the Eastern US and Southern Plains as warm and humid conditions allow for thunderstorms to develop.  Flow from the south pulls ample moisture and warm air in from the Gulf of Mexico.  This produces periods of severe thunderstorms, in addition to maintaining unseasonably warm temperatures across the Central and Eastern US. (AP PHOTO/WEATHER UNDERGROUND)
This NOAA satellite image taken Sunday, March 18, 2012 at 1:45 a.m. EDT shows clouds cover parts of the Eastern US and Southern Plains as warm and humid conditions allow for thunderstorms to develop. Flow from the south pulls ample moisture and warm air in from the Gulf of Mexico. This produces periods of severe thunderstorms, in addition to maintaining unseasonably warm temperatures across the Central and Eastern US. (AP PHOTO/WEATHER UNDERGROUND)
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