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A strong southerly flow from the Gulf of Mexico pushed warm, muggy air across the central third of the country on Thursday. This air interacted with a cold frontal boundary over the Four Corners and the central Plains to trigger strong to severe thunderstorms.

This line of thunderstorms extended from eastern Texas to North Dakota, as flash flood warnings were issued in northeast Texas. College Station, Texas, reported a midday total of 1.67 inches of rain, while Oklahoma City, Oklahoma, reported a midday total of 1.89 inches of rain.

Temperatures were cold enough behind the frontal boundary to produce heavy snow showers over northwest Nebraska and southwest South Dakota. Sheridan, Nebraska, reported a midday total of 10.0 inches of snow, while Cherry, Nebraska, reported a midday total of 3.5 inches of snow.

Scattered showers moved across the northern Mid-Atlantic on Thursday, while the remainder of the Eastern Seaboard avoided wet weather. Temperatures ranged between the 80s and 90s across the Southeast, as Bennettsville, South Carolina, recorded a midday high of 95 degrees.

Meanwhile, a cold frontal boundary approached the West Coast. Low pressure along the northern tier of the frontal boundary ushered moderate to heavy rain across western Washington and northwest Oregon. A ridge of high pressure along the coast of California kept the Desert Southwest clear of precipitation on Thursday.

THURSDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................95 Bennettsville, S.C.

HIGHEST HEAT INDEX (DEGREES F)..........................96 John Bell Williams, Raymon, Miss.

LOWEST TEMPERATURE (DEGREES F)..........................12 Yellowstone, Wyo.

LOWEST WIND CHILL (DEGREES F)...........................-8 Deadhorse, Alaska

HIGHEST WIND GUST (MPH).................................66 Algona, Iowa

HIGHEST PRECIPITATION (INCHES)..........................1.89 Oklahoma City Wiley Post, Okla.

ON THIS DATE....... The "Mother's Day" tornado outbreak on this date in 1988 included 57 tornadoes (24 in Wisconsin and 22 in Iowa) spawned by thunderstorms in the Mississippi Valley. Although nobody was killed in this outbreak, a person in Rockford. Illinois, was inside a portable toilet when it was blown over by 80 mph winds.

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