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An area of low pressure inched eastward over eastern Texas on Thursday. As this system drew warm, muggy air from the Gulf of Mexico, heavy rain and thunderstorms developed across the southern Plains and the lower Mississippi Valley. A flood warning was issued in southeast Oklahoma due to heavy rain across the region.

McAlester, Oklahoma, reported a midday total of 1.78 inches of rain, while Paris, Texas, reported a midday total of 3.61 inches of rain. Just to the east, a low pressure system retrograded westward over the Southeast.

This system ushered rain and thunderstorms over several states, as flash flood watches were issued in western South Carolina and western North Carolina. Greenville, South Carolina, reported a midday total of 2.55 inches of rain. Additionally, isolated thunderstorms developed across the Northeast as a cold front sank southeastward over the Great Lakes.

In the West, monsoonal moisture spread across the Intermountain West, the Great Basin and the Southwest on Thursday. As this moisture collided with the tail end of a cold front, locally heavy rain developed over the southern Rockies. Flash flood watches were issued across New Mexico and the western tip of Texas. High pressure over the eastern Pacific kept conditions mostly clear across the West Coast.

THURSDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................108 Palm Springs, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................111 Immokalee Regional Airport, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................35 Pinedale, Wyo.

LOWEST WIND CHILL (DEGREES F)...........................26 Deadhorse, Alaska

HIGHEST WIND GUST (MPH).................................45 Guadalupe Pass, Texas

HIGHEST PRECIPITATION (INCHES)..........................3.61 Paris, Texas

ON THIS DATE....... Stationary thunderstorms over Colorado's Big Thompson Canyon dumped up to 14 inches of rain into the canyon's drainage system on this date in 1976. A popular recreation destination, the canyon was crowded with thousands of people that day and at least 139 people were killed as a 20 foot wall of water rushed through the canyon's drainage system.

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