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[August 04, 2011] (AP) Hot and humid temperatures will persist across the south-central United States on Thursday, while active weather will pop up in multiple areas across the country. A ridge of high pressure will remain stationary over the southeastern corner of the U.S., bringing extremely hot temperatures to the southern states. Temperatures will reach to over 100 degrees, with heat indexes at 120.

Meanwhile, to the north, a frontal boundary will push through the Tennessee Valley and Mid-Atlantic states, kicking up showers and thunderstorms. However, high pressure over the Northeast will produce sunny and dry conditions from the Great Lakes to the extreme Northeast.

In the upper Midwest, a low pressure system will push a frontal boundary extending to the northern Rockies, triggering moderate showers. These storms will be slow-moving and contribute to wet conditions across most of the northern states. In addition, a low pressure system spinning over the central Plains will kick up additional showers over the region.

To the east, monsoon moisture will continue to bring scattered showers to the Four Corners region and the central Rockies. Meanwhile, a trough will dip into California, bringing slightly cooler temperatures and coastal clouds across the West Coast. However, sunny and dry conditions are expected to continue in California and the Pacific Northwest.

Temperatures in the Lower 48 states Wednesday ranged from a morning low of 35 degrees at Truckee-Tahoe, Calif., to a high of 113 degrees at Stigler, Okla.

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[Associated Press article from Weather Underground]