Snow Reaches DC, Philly; Grazes NYC

By , Senior Meteorologist
March 25, 2013; 7:30 PM ET
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Play video An expert analysis on the snowstorm is given in the above video.

A storm responsible for heavy snow from Denver to Kansas City on Saturday and from St. Louis to Indianapolis on Sunday will continue to affect the mid-Atlantic into Monday evening with snow, slush and rain.

The heaviest snow will focus over part of South Jersey into Monday evening and could briefly swing into central and eastern Long Island for a time Monday night, following rain. These areas have the best chance at picking up a quick couple of inches. The timing of the snow along the mid-Atlantic coast should coincide with when road surfaces are cooling Monday evening.

As the storm heads out to sea later Monday night, precipitation will shut down from west to east from the western suburbs of the I-95 cities to the coast. However, pockets of flurries and intermittent snow will remain behind over the Appalachians and the Ohio Valley.

It is possible that some roads over the Midwest and central Appalachians that became wet during the day Monday can become slippery again overnight. Some folks whose cars were cleaned off when they got home Monday evening may be covered with snow again by Tuesday morning.

Most of the snowfall during the day Monday was on grassy surfaces. This map shows additional accumulation expected Monday evening. A larger version of this map is available on the Winter Weather Center.

The storm struggled with marginal temperatures along I-95, causing some of the snow to fall as rain or melt as it fell. However, enough slush and poor visibility result in travel delays and foiled plans to start the week for many.

Minor coastal flooding can also occur from New Jersey to Cape Cod through Monday night. More details on this danger can be found here.

Part of the storm started on Sunday night, including in Pittsburgh, Pa., and Washington, D.C., when road surface temperatures were cold. The Pittsburgh area had accumulated as much as 3 inches before sunrise while some of the mountainous areas of West Virginia had already received 10 inches. As a result, many Monday morning commuters were navigating on some slippery secondary roadways. meteorologists are bringing you live reports of the Mid-Atlantic snowstorm to keep you informed.

From Washington, D.C., to Baltimore, Wilmington, Philadelphia, Trenton and New York City, precipitation falling for part of the day on Monday fought the March sun effect. Even when concealed by clouds, enough energy gets through to warm road surfaces, causing some or all of the snow to melt.

It has to snow very hard in urban areas to overwhelm the sun effect and accumulate on paved and concrete surfaces during the middle of the day. The greatest amount of snow will be on grassy and elevated surfaces from Washington, D.C. to Trenton, N.J. The snow had more success accumulating northwest and southeast of this major urban highway.

This image of a slushy snowman and forward thinking for baseball season was taken on March 6, 2013, in Alexandria, Va., by Flickr user wfyurasko.

The area of accumulating snow has been and will continue to be defined by rather sharp edges across the north and south.

Live Updates on the Snowstorm
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As always, local effects, such as urban versus rural and valley versus mountains, can bring a little less or a little more snowfall respectively. During March, these effects are often exploited to the max.

As the snowstorm impacts the mid-Atlantic, it should only graze the South Coast of New England. A chance from what has become so common this winter, New England is actually expected to escape the worst of the storm.

The thumbnail image of snow in Terre Haute, Ind., on Sunday, March 24, 2013, is from Facebook fan Michael G.

This story was originally published at 10:00 a.m. EDT Sunday, March 24, 2013 and has been updated most recently at 3:00 p.m. Monday, March 25.


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