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December 16, 2010 / Dave Gorham

Storm Development Outlook: Mid-Atlantic and Appalachians

Snow will continue across the Midwest today with a developing system leading to snow and ice across the Ohio River Valley, Appalachians and into the Mid-Atlantic.

Snow will linger from the Dakotas through much of the Midwest today while a developing surface low pushes eastward across the Tennessee River Valley and into the Mid-Atlantic. This feature will lift warm, moist air over cold air already entrenched over the eastern U.S. to allow for moderate-to-heavy snow and potentially significant icing. The heaviest precipitation is expected to fall from the Ohio River Valley through northeastern Tennessee, western North Carolina and through southern Virginia. Along and north of a line from Cincinnati Ohio, southeast through Blacksburg and Richmond, Virginia expect mostly snow and patchy sleet with mostly sleet and freezing rain to the south. Ice accumulations could reach up to 1/4 inch from northern and eastern Kentucky through northeastern Tennessee and along the Virginia and North Carolina border. In these locations, ice accumulations could accumulate on roads, trees, and power lines. This would obviously affect travel and business this morning through early afternoon. Elsewhere, only light icing, below 1/10 inch, is possible down through northern Georgia and central North Carolina. Here, ice will be mainly limited to elevated surfaces with some elevated roadways becoming very slick.

A secondary low pressure system moving off the Eastern Seaboard may pose a threat of wintry precipitation up through the Mid-Atlantic and New England coast late in the weekend and into next week, but there remains some uncertainty in the path of this system. A more easterly path of this system will mean littleto-no impact to the East Coast, but a path closer to shore could mean significant snow and wind impacts over some major metropolitan areas of New England.

The current radar over the early Friday SDO forecast. Image: ImpactWeather Gmaps.

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