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A cold frontal boundary extended from the upper Intermountain West, over the central Plains and across the upper Midwest on Friday. As warm, muggy air interacted with a cooler air mass behind the frontal boundary, strong to severe thunderstorms developed across the region. Severe thunderstorm warnings were issued in eastern Colorado, western Nebraska and southern South Dakota, while a tornado warning was issued in north central Nebraska. A cluster of showers also moved across eastern Montana and North Dakota.

A separate cold front stretched across the southern Plains, the middle Mississippi Valley, the Tennessee Valley and the Southeast. Warm, muggy air also interacted with this frontal boundary to initiate widespread rain and thunderstorms over a handful of states. Severe thunderstorm watches were issued in southeast Oklahoma, Arkansas, southwest Tennessee, northern Mississippi, northern Alabama and northwest Georgia. Flash flood warnings were also issued in northwest Arkansas as heavy rain accompanied these thunderstorms. Woodward, Oklahoma, reported a midday total of 2.17 inches of rain, while Walnut Ridge, Arkansas, reported a midday total of 1.02 inches of rain. High pressure over the Gulf of Mexico kept conditions mostly clear across the Gulf Coast on Friday.

To the north, a low pressure system over Nova Scotia ushered rainy weather across northern New England. Frenchville, Maine, reported a midday total of 0.65 inches of rain. Meanwhile, conditions remained warm and dry across the West Coast due to a ridge of high pressure over the eastern Pacific. Excessive heat watches were issued in southeast California, southern Nevada and northwest Arizona, as Needles, California, recorded a midday high of 105 degrees.

FRIDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................105 Needles, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................105 Ellington Field, Texas

LOWEST TEMPERATURE (DEGREES F)..........................25 Stanley, Idaho

LOWEST WIND CHILL (DEGREES F)...........................20 Point Hope, Alaska

HIGHEST WIND GUST (MPH).................................56 Fort Worth NAS, Texas

HIGHEST PRECIPITATION (INCHES)..........................2.17 Woodward, Okla.

ON THIS DATE....... On this date in 1816, Salem, Massachusetts, recorded a high temperature of 92 degrees. A day later, the temperature would register at 49 degrees to mark the start of "The Year Without a Summer."

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