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A very active weather pattern moved through the Central U.S. on Tuesday as an upper trough of low pressure from the Western U.S. advanced eastward into the Plains.

As this trough deepened, it ushered a complex system across the Plains with a series of strengthening lows lifting along a cold front associated with the trough. Increased instability from this system led to showers, areas of heavy rain, and organized thunderstorms along and ahead of the advancing cold front, from the Southern Plains through the Ohio Valley through the afternoon.

Further ahead of this system, areas from the Arklatex region through the lower Ohio Valley remained at moderate risk of severe thunderstorm development with threats of hail, damaging wind and tornadoes especially during the evening and overnight hours.

Meanwhile, areas surrounding this moderate risk area, from the eastern Southern Plains and Lower Mississippi Valley through the Ohio Valley remained at slight risk of severe thunderstorm development with similar primary threats.

To the north, a warm front associated with this system kicked up showers, freezing rain and thunderstorms in the Ohio Valley and Great Lakes. Finally, much colder air behind this system supported light to moderate snow showers across the Central Plains through the afternoon.

Out West, strong onshore flow maintained coastal rain and moderate to heavy high elevation snow in the Pacific Northwest, northern Great Basin, and parts of the Northern and Central Rockies. A variety of Wintery Weather Advisories and Winter Storm Warnings remained in effect for the the Northwest and northern Great Basin through the afternoon..

TUESDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................91 Kingsville NAS, Texas

HIGHEST HEAT INDEX (DEGREES F)..........................93 Kingsville NAS, Texas

LOWEST TEMPERATURE (DEGREES F)..........................-14 Big Piney, Wyo.

LOWEST WIND CHILL (DEGREES F)...........................-56 Deadhorse, Alaska

HIGHEST WIND GUST (MPH).................................79 Guadalupe Pass, Texas

HIGHEST PRECIPITATION (INCHES)..........................1.92 Whiteman AFB, Mo.

ON THIS DATE....... It was a cold New York City morning on this date in 1780 as the temperature dropped to -16 degrees. The intense cold actually froze New York Harbor to such a depth that the British were able to carry a heavy cannon across the ice in order to fortify Staten Island.

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