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A cold front is forecast to extend from the Florida Panhandle to New England on Tuesday. A cold air mass behind the frontal boundary will interact with a warm, muggy air mass ahead of the front to produce a line of showers and thunderstorms. Stormy weather is expected across most of the East Coast, while severe thunderstorms will be possible along the Mid-Atlantic coast. As cold air invades the northern tier of the country, a mixture of rain and snow will develop over the upper Midwest, the Ohio Valley and the Northeast. This system will also bring a chance of flash floods to eastern New York and eastern Pennsylvania.

A cold air mass behind the frontal boundary is expected to linger across the central third of the country, as temperatures are forecast to be 20 to 30 degrees below normal. Conditions will stay mostly clear across the Plains and the Midwest throughout the day.

Meanwhile, an area of low pressure will trek eastward across the Pacific Northwest, the Intermountain West and the northern Plains on Tuesday. During the morning, rain will be possible over Washington, Oregon and Idaho, while high elevation snow showers are expected across the Rockies during the afternoon and evening. This system will bring a chance of mixed precipitation to the northern Plains late in the evening. High pressure will keep conditions clear across the Southwest. Temperatures are forecast to range between the 80s and 90s across the southern California and Arizona deserts.

MONDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................93 Death Valley, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................100 Kendall, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................-7 Yellowstone Lake, Wyo.

LOWEST WIND CHILL (DEGREES F)...........................-14 Laramie, Wyo.

HIGHEST WIND GUST (MPH).................................71 Cape Romanzoff, Alaska

HIGHEST PRECIPITATION (INCHES)..........................4.22 Vicksburg, Miss.

ON THIS DATE

Death Valley is the hottest and driest location in North America. The average year in Death Valley sees less than 2 inches of rain, with many years receiving no rain at all. On this date in 1988, Death Valley uncharacteristically received 1.53 inches of rain in one 24 hour period.

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