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Parts of the Midwest and much of the East kicked off the work-week with a chilly start this Monday morning as a trough of low pressure became situated over the East.

With the trough over the East and a ridge of high pressure located over the West, strong north to northwest flow in between these systems ushered a much colder air mass from the north into the Midwest and East. This translated into unseasonably cold temperatures for these areas as daytime highs were up to 20 to 30 degrees shy of normal highs for this time of year.

Areas of the Midwest into the Northeast remained under various Freeze Watches and Warnings and Frost Advisories through Monday morning. With temperatures near the freezing mark during the morning hours, a few areas of wet snowflakes in addition to light scattered rain showers were possible downwind of the Lower Great Lakes in Upstate New York. Additional chances of snow mixed with rain showers were possible in the higher elevations of the Central Appalachians.

As weather cooled off in the East, temperatures began to heat up across the Great Plains. Record highs were possible later in the afternoon on Monday as the ridge of high pressure over the West began to shift eastward.

Elsewhere, a warm front dipped into the north-central part of the nation and kick up scattered rain showers in the Upper Midwest as the disturbance advanced eastward across the Northern Plains. In the Northwest, scattered rain showers and areas of thunderstorms were expected through the day as the tail of a cold front reached across the Northern Intermountain West.

Afternoon and evening thunderstorms in the region as well as the Northern Plains had the potential to turn severe with hail and/or severe wind. Meanwhile, a second cold front kicked up another round of showers in the Pacific Northwest as it approached the Pacific Northwest Coast..

MONDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................102 Santee, Calif.

HIGHEST HEAT INDEX (DEGREES F)..........................93 Miami, Fla.

LOWEST TEMPERATURE (DEGREES F)..........................14 Mt. Washington, N.H.

LOWEST WIND CHILL (DEGREES F)...........................-18 Red Dog Mine, Alaska

HIGHEST WIND GUST (MPH).................................84 Mt. Washington, N.H.

HIGHEST PRECIPITATION (INCHES)..........................1.08 Ketchikan, Alaska

ON THIS DATE....... A couple incredible hail facts occurred on this date. First, in 1975, hail the size of tennis balls amassed to a depth of 10 inches in Wernersville, PA. Also, in 1930, a farmer was killed in a hailstorm near Lubbock, TX accounting for the only official United States death due to hail.

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