From NASA's Earth Observatory eblast:
An early spring storm system advanced out of the Southern Plains in mid-March 2008, causing widespread flooding. Strong southerly winds developed ahead of an area of low pressure located over the Southern High Plains and drew moisture up from the Gulf of Mexico across Texas and Louisiana. This warm, moist air collided with a frontal boundary (the boundary between two air masses of different temperature, pressure, or humidity) that draped across central Texas into central Missouri. The convergence produced repeated bouts of thunderstorms and heavy rain from central Texas through Oklahoma and into Kansas and Missouri.
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