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Weather Underground midday recap for Wednesday, July 27, 2016

A plume of moisture moved onshore over the Gulf Coast on Wednesday, while a cold frontal boundary extended from southeast Canada to the northern Plains.

A warm and moist air mass surged across the Gulf Coast and interacted with a stationary front. This interaction produced rain and thunderstorms in the southern Plains, the Gulf Coast, the lower Mississippi Valley, the Tennessee Valley and the Mid-Atlantic. Flash flood warnings were issued for north central Tennessee and south central Kentucky, while flood advisories were issued in southern Louisiana. Lafayette, La.,. reported a midday total of 1.36 inches of rain. Springfield, Mo., reported a midday total of 1.74 inches of rain.

Just to the north, a cold frontal boundary generated thunderstorms across the northern Plains and the Midwest. Flood warnings were issued in northeast South Dakota. Ortonville, Minn., reported a midday total of 1.25 inches of rain. Sheboygan, Wis., reported a midday total of 1.00 inches of rain.

Out west, scattered showers and isolated thunderstorms popped up across the Desert Southwest as monsoonal moisture lingered over the region. High pressure kept temperatures 5 to 15 degrees above normal over a large part of the Southwest, the Great Basin and the Northwest. Excessive heat warnings and heat advisories were issued in southern California, Nevada and western Arizona. Las Vegas, Nev., recorded a midday high of 109 degrees. Palm Springs, Calif., recorded a midday high of 107 degrees.

Temperatures in the Lower 48 states Wednesday have ranged from a morning low of 35 degrees at West Yellowstone, Mont. to a midday high of 109 degrees at Blythe, Calif.

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