Severe thunderstorms and flash flooding expected across portions of thenorthern/central Plains today and into the Midwest Friday......Dangerously hot conditions will continue for parts of the South andSoutheast......Monsoon-like conditions persist today in the Four Corners region...A strong upper level trough is swinging across the Pacific Northwest todayand pushing a surface frontal system southeast across the IntermountainWest into the northern and central Plains. Conditions will be support...