Weather Underground Forecast for Saturday,December 21,2013
A very active weather system will trek across the central and eastern
thirds of the country on Saturday, while an area of low pressure will
bring wet weather to the Pacific Northwest.
A cold frontal boundary extending from Texas to the Great Lakes will
trigger severe thunderstorms, freezing rain, and flash flooding across a
handful of states. Severe thunderstorms will be possible across the
lower Mississippi Valley, the Tennessee Valley and the Ohio Valley as a
warm, muggy air mass from the Gulf of Mexico interacts with a cold,
continental air mass from the north. These thunderstorms will supply
enough precipitation to trigger flash flooding. Freezing rain will be
possible in parts of Kansas, Missouri, Iowa and Illinois before an
abundance of heavy snow pushes across the area.
A separate and much drier cold front will stretch from the Intermountain
West to the western Great Lakes, as frigid conditions will spread
across the northern Plains and upper Midwest. Meanwhile, a low pressure
system over the eastern Great Lakes and Northeast will allow for
freezing rain and snow to set up across parts of New York and northern
New England.
Out west, a trough of low pressure will continue to provide showers to
parts of Oregon and Washington, while snow showers will move across the
Cascades and northern Rockies.
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