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Late-Week Snowstorm to Dip into the South

Snow, wintry mix and slippery travel from Midwest to parts of South, Atlantic Coast
Jan. 24, 2013

The combination of lingering arctic air and two merging storms has the potential to spread a large swath of snow, wintry mix and slippery travel from the Midwest to the part of the South and Atlantic Coast at the end of the week.

As with many winter storms, it's complicated.

The storm scenario continues to trend colder and farther south than indications to start this week.

How much snow falls depends on how quickly two storms come together. One storm is coming from western Canada (an Alberta Clipper), and the other is a storm from the southern United States.


Part of the Upper Midwest will be solely under the influence of the Alberta Clipper.

A broad area of snow and flurries will occur from around the Ohio River northward to the Great Lakes with coating to an inch of snow. Chicago, Louisville, Indianapolis, Cincinnati and Detroit fall within this area.

Part of this area could find a way into a heavier band of snow that brings a few inches. This is a little more likely farther east in Ohio, West Virginia and southwestern Pennsylvania, while areas farther west are more likely to have issues with dry air limiting the precipitation. Little or no precipitation is likely around St. Louis, but even a light amount of sleet or freezing rain can cause slippery travel.

A wintry mix and slippery conditions are likely from southwestern Kentucky to middle Tennessee including the Paducah, Ky., and Nashville, Tenn., areas.

Mid-Atlantic and the South

Farther east, the area from the northern Shenandoah Valley to Washington, D.C., Philadelphia, Atlantic City, N.J., and Dover, Del., northward to upstate New York, lie in a swath where it is a snow or no situation like that of the Ohio Valley states.

Colder air will have been around for a few days ahead of the late-week storm. As a result, the snow and wintry mix has a greater potential to adhere to paved and concrete surfaces, raising the risk of slippery conditions and travel delays.

It appears that farther south, a wedge of cold air will lead to snow and a wintry mix into northern and western North Carolina to a large part of southeastern Virginia and the southern Delmarva Peninsula. This includes the cities of Beckley, W.Va., Greensboro, Charlotte and Raleigh, N.C., Roanoke and Richmond, Va., and Salisbury, Md. Accumulations in this area would range from a slippery coating due to an icy mix to several inches of snow.

New York City, New England

Odds favor, cold dry air winning out around New York City and interior New England. It is possible that enough moisture from one or the other of the two storms produces a band of light snow in the area.

Southeastern New England (Cape Cod) is likely to share the same fate as New York City, unless the storms get together quickly and turn northward at the last minute. The more likely scenario being radar snow and a spotty light accumulation. The other outlier being an all-out blizzard.

Forecast Challenges

Just as the chance that the western Canada and southern U.S. storms may fail to come together, leaving spotty light snow from the Ohio Valley to the East, there is still the potential the two late-week storms to fully merge.

The latter would produce a swath of heavy snow over part of the South and farther north over the mid-Atlantic and southern New England.

Because of the extend of arctic air, it will not take a great deal of moisture to produce several inches of snow. In this case, a tenth of an inch of liquid (rain) could yield 3 inches of snow. A typical liquid to snow equivalent for storms in the East is 10 to 1, where a tenth of an inch of water would yield an inch of snow or an inch of water would yield 10 inches of snow.

The arctic air has already unleashed locally heavy lake-effect snow even in areas missed by the path of the general storms this week.

The dense arctic air is playing a major role in driving the storms farther south.

AccuWeather.com will have further updates on the potential for snow as the week progresses.

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Weather here in SW Florida (Alva) is sunny and warm. We don't miss the cold winters of New York and Western PA.
Come down here and visit us...ya here?

January 24 2013 at 12:19 PM Report abuse rate up rate down Reply

Who cares as long as we're 1 day closer to SUMMER!

January 24 2013 at 12:07 PM Report abuse rate up rate down Reply

They can't predict the weather day to day. And this one they say is complicated. Wonder what that means. Just say it could snow as little as an inch and as much as a foot, as our local radio station stated in the Lehigh Valley. It's January and it is suppose to snow. LOL

January 24 2013 at 11:41 AM Report abuse rate up rate down Reply

They can't predict the weather from day to day. This one, they say is complicated. Wonder what that means. Just say what our local radio station said one Monday. Prepare for an inch or 12 inches in the Lehigh Valley. It is January and it is suppose to snow. LOL

January 24 2013 at 11:39 AM Report abuse rate up rate down Reply

if it happens it happens.....better off being prepared then if it doesnt happen oh well all ready for the next one

January 24 2013 at 11:13 AM Report abuse rate up rate down Reply

hell, let it snow, no way to stop it

January 24 2013 at 11:03 AM Report abuse rate up rate down Reply

LOL LOL....M.Taylor....exactly

January 24 2013 at 10:50 AM Report abuse rate up rate down Reply

How South will the Snow fall? The lottery of snowflakes, hah!

January 24 2013 at 10:42 AM Report abuse rate up rate down Reply

Typical WX on the East Coast : Nasty late January cold spell, followed by one or two snow events into early February. And then it's all over for another year ... : ]

January 24 2013 at 10:38 AM Report abuse +1 rate up rate down Reply

good they need the water badly

January 24 2013 at 10:37 AM Report abuse rate up rate down Reply
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