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A cold frontal boundary extended across the Eastern Seaboard on Friday, while a separate frontal boundary stretched over the upper Intermountain West and the northern Plains.

Severe thunderstorm warnings were issued in several states along the Eastern Seaboard on Friday as a cold front inched across the area. Warm air from the Gulf of Mexico pushed in front of the cold front, which initiated a line of thunderstorms from Florida to Pennsylvania. Pensacola, Fla., reported a midday total of 2.19 inches of rain, while Valparaiso, Fla., reported a midday total of 1.83 inches of rain. The southern tip of Florida experienced warm, muggy conditions, as Immokalee Regional Airport, Fla., recorded a midday high of 91 degrees. Along the northern end of the frontal boundary, cold air allowed for a mixture of freezing rain, sleet and snow to develop over parts of Pennsylvania, New York and New England. Winter weather advisories were issued in northern Maine as moderate snow showers shifted across the region.

A separate frontal boundary ushered heavy snow across the Cascades and northern Rockies, as Mineral, Mont., reported a midday total of 11.0 inches of snow. Avalanche warnings were issued in parts of Washington and Idaho as a result of heavy snow showers. Meanwhile, high pressure kept conditions warm and sunny from the Southwest to the southern Plains on Friday.

FRIDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................91 Immokalee Regional Airport, Fla.

HIGHEST HEAT INDEX (DEGREES F)..........................91 Kendall, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................-16 Rugby, N.D.

LOWEST WIND CHILL (DEGREES F)...........................-68 Deadhorse, Alaska

HIGHEST WIND GUST (MPH).................................76 Syracuse, N.Y.

HIGHEST PRECIPITATION (INCHES)..........................2.19 Pensacola, Fla.

ON THIS DATE....... An unusual northeastern Louisiana tornado outbreak occurred on this date in 1971, killing over 120 people. Nearly 50 people were killed by the first tornado as it touched down in Louisiana and quickly moved into Mississippi. Almost 1600 people were injured.

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