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Updated: 5:00 AM GMT on July 30, 2015
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Weather Underground Forecast for Thursday, July 30, 2015

A cold front will stretch from the eastern Great Lakes to the lower Mississippi Valley on Thursday, while stormy weather develops across the Southwest.

A cold frontal boundary will extend south southwestward over the eastern Great Lakes, the interior Mid-Atlantic, the Tennessee Valley and the lower Mississippi Valley. This frontal boundary will interact with warm, humid air from the Gulf of Mexico, which will initiate a line of rain and thunderstorms across the Eastern Seaboard and the eastern half of the Gulf Coast. The heaviest rain will likely develop along the eastern Gulf Coast due to moisture pooling from the Gulf of Mexico. A ridge of high pressure will remain parked over the southern Plains. Warm, muggy conditions will persist from the southern Plains to the Deep South. This high pressure system will also usher monsoonal moisture across the Southwest and the southern Plains. Showers and thunderstorms will fire up from southern California to the central and southern Plains. The most organized storms are forecast to impact northeast New Mexico, northern Texas and western Oklahoma on Thursday.

A separate ridge of high pressure over the eastern Pacific will keep conditions warm and dry across the Northwest. Temperatures will spike 10 to 15 degrees above normal from northern California to the Pacific Northwest.

Meanwhile, there will be a slight chance of evening showers and thunderstorms over the upper Midwest as a cold front dips southeastward over the region.

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