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A cold front stretched across the southern Plains, the lower Mississippi Valley, the Tennessee Valley, the Mid-Atlantic and New England on Wednesday. As this system moved across a warm, humid air mass, strong to severe thunderstorms developed ahead of the frontal boundary. Severe thunderstorm warnings were issued in Virginia, North Carolina, South Carolina and along the Florida Panhandle.

Lancaster, S.C., reported a midday total of 0.96 inches of rain, as well as wind speeds of 36 mph. Heavy rain and thunderstorms also impacted the lower Mississippi Valley and the Gulf Coast, as flash flood warnings were issued in southwest Mississippi. Natchez, Miss., reported a midday total of 1.56 inches of rain, while Mena, Ark., reported a midday total of 2.86 inches of rain. An area of high pressure formed to the north of the frontal boundary, which kept conditions mostly clear across the upper Midwest and the Ohio Valley.

Meanwhile, a severe weather statement was issued in north central Nebraska on Wednesday as a low pressure system brought severe thunderstorms to the region. Just to the west, monsoonal thunderstorms continued to develop across the Desert Southwest, the Great Basin and the Intermountain West. Flash flood watches were issued in parts of Colorado, Utah and Nevada. A ridge of high pressure over the eastern Pacific kept conditions clear across the West Coast..

WEDNESDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................100 Quincy Muni, Quincy, FL, Fla.

HIGHEST HEAT INDEX (DEGREES F)..........................107 Chandler, Ariz.

LOWEST TEMPERATURE (DEGREES F)..........................39 Leadville, Colo.

LOWEST WIND CHILL (DEGREES F)...........................23 Barrow, Alaska

HIGHEST WIND GUST (MPH).................................77 Mt. Washington, N.H.

HIGHEST PRECIPITATION (INCHES)..........................2.90 Mena, Ark.

ON THIS DATE....... Tucson, AZ reported a high temperature of over 100 degrees for the 33rd consecutive day on this date in 1987. What is even more remarkable than that is the morning low was 68 degrees, the 4th record breaking low in the past five days.

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