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Weather Underground Forecast for Monday, December 22, 2014
An area of low pressure will shift across the central third of the country on Monday, while a coastal system will develop over the southern Mid-Atlantic.
A low pressure system will move eastward over the northern Plains and the Midwest on Monday. This system will usher widespread precipitation across the Plains, the Mississippi Valley, the Tennessee Valley and the upper Midwest. Snow showers will be mostly confined to the northern Plains, while a mixture of rain and snow will affect the central high Plains and the upper Midwest. Light rain will spread across the southern Plains, the middle Mississippi Valley, the Tennessee Valley and the Ohio Valley. In addition, a cold front associated with this system will extend west northwestward over the Intermountain West and the Pacific Northwest. Scattered light showers will persist over Oregon and Washington, while moderate to heavy snow showers will develop across the central and northern Rockies. Snow accumulations could exceed one foot across favorable mountain slopes. A light mixture of rain and snow will also develop across the northern Great Basin. Conditions will stay relatively clear across the Southwest as high pressure builds over the eastern Pacific.
Meanwhile, a trough of low pressure will deepen along the coast of the Carolinas. Rain and thunderstorms will develop over the southern Mid-Atlantic and the Southeast. An onshore flow from the Gulf of Mexico will also initiate thunderstorms over the eastern Gulf Coast on Monday. To the north, late evening rain and snow will be possible across the central and northern Appalachians.