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An active weather system moved across the central third of the country on Sunday as a cold frontal boundary stretched from Arizona to Michigan. A cold air mass pushed southward over the Intermountain West, the Plains and the upper Midwest, while a warm, muggy air mass surged northward from the Gulf of Mexico. As these two air masses collided, strong to severe thunderstorms developed across the southern Plains, the Mississippi Valley and the upper Midwest.

Tornado watches and severe thunderstorm watches were issued over several states, as Cowley, Kan., reported a midday total of 1.50 inches of hail, while Osceola Municipal, Iowa, reported a midday total of 2.22 inches of rain. Meanwhile, a mixture of rain and snow pushed across the central Rockies and the central Plains as an area of low pressure deepened over the area. Winter storm warnings were issued in Wyoming and Colorado, while freeze warnings were issued in western Oklahoma and southwestern Kansas. Crook, Wyo., reported a midday total of 4.0 inches of snow.

A mixture of rain and snow also moved across Maine on Sunday, while the remainder of the Eastern Seaboard experienced warm, sunny conditions. Kendall, Fla., recorded a midday high of 86 degrees, while Point Pleasant, W. Va., recorded a midday high of 87 degrees.

High pressure also kept conditions clear across the West Coast, as temperatures ranged between the 80s and 90s across the Desert Southwest.

SUNDAY'S WEATHER EXTREMES:

HIGHEST TEMPERATURE (DEGREES F).........................93 Vernon, Texas

HIGHEST HEAT INDEX (DEGREES F)..........................94 Kingsville NAS, Texas

LOWEST TEMPERATURE (DEGREES F)..........................7 Great Falls, Mont.

LOWEST WIND CHILL (DEGREES F)...........................-28 Barrow, Alaska

HIGHEST WIND GUST (MPH).................................62 Kearney, Neb.

HIGHEST PRECIPITATION (INCHES)..........................2.22 Osceola Municipal, Iowa

ON THIS DATE....... Thunderstorms without tornadoes can cause more damage than you would think. For instance, on this date in 1987, a strong thunderstorm in Texas created wind gusts of almost 100 mph. Wind of this magnitude was enough to destroy two airplanes, and caused $1 million in property damage.

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