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[August 02, 2010] (AP) Hot and humid weather was forecast to linger over much of the southern U.S. on Monday as a large dome of high pressure dominated the region with a heat wave.

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Strong heating over from the southern Plains through the Gulf Coast states would keep daytime highs well above normal, with afternoon temperatures near 100 degrees. Meanwhile, a rich plume of Gulf moisture would raise humidity levels through the afternoon. This combo of hot temperatures and high humidity levels would translate into dangerously high heat indexes above 110 degrees, thus keeping heat advisories and excessive-heat warnings in effect. Meanwhile, areas of showers and thunderstorms were expected to persist in the Carolinas.

To the north, a frontal boundary would move into the central and northern Plains with areas of low pressure. Subtropical moisture would interact with these disturbances to produce showers and thunderstorms with periods of heavy rainfall. Storms from the central and northern Plains into the upper Great Lakes would have the potential to turn severe with damaging wind gusts.

In the West, an active monsoonal flow would spread across the Four Corners with showers and thunderstorms. Persistent precipitation would create chances of flash flooding throughout the day. Elsewhere, typical midsummer weather conditions would persist across the West Coast states.

Temperatures in the Lower 48 states Sunday ranged from a low of 30 degrees at Chemult, Ore., to a high of 108 degrees at Borrego, Calif.

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[Associated Press article from Weather Underground]