Heavy Norlun Trough Snow to Target Hard-Hit NYC Area

January 6, 2011; 5:21 AM ET
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A band of heavy snow Friday into Friday night will impact a relatively small area of the Northeast, but this zone includes the New York City area.

The heavy snow will evolve from an Alberta Clipper that is responsible for the generally light snow showers currently spreading over the Midwest and a broad area of light, but slippery snow coming elsewhere in the Northeast.

Steadier snow will begin to develop across eastern Pennsylvania, New Jersey and central New York Friday morning. Residents should prepare for slick commute to work in Wilmington, Del.; Philadelphia, Pa.; and Binghamton, N.Y.

Later Friday, the snow will organize into an extremely intense and narrow band that AccuWeather.com Senior Meteorologist Matt Rinde states will only be "50 to 100 miles wide."

Rinde continued, "The band will become oriented from northwest to southeast, stretching from eastern Lake Ontario to southern New England."

For a larger version of this map, please visit the AccuWeather.com Winter Weather Center.

The band will unleash 3 to 6 inches of snow with locally higher amounts from Long Island and coastal Connecticut through southeastern and part of upstate New York. Midtown Manhattan and Hartford, Conn., can expect a fresh 3 to 6 inches.

The snow will amount to these totals in an 8- to 14-hour period, spanning Friday afternoon and night.

It should be stressed that this band of snow will be forming on Friday and cannot be tracked in advance.

As a result, AccuWeather.com Expert Senior Meteorologist Alex Sosnowski warned on Wednesday that "It [the snow band] could set up 100 miles farther north into more of New England or farther south into more of the mid-Atlantic region."

The intense band of snow will create significant travel disruptions. Roadways, including portions of several interstates, will quickly become snow-covered and slick.

Motorists will also be faced with reduced visibility as the snow falls heavily.

A norlun trough will develop across the Northeast on Friday, which AccuWeather.com Meteorologist Mark Mancuso stated "is notorious for producing a narrow band of heavy snow."

The adverse conditions could force officials to postpone some school-related activities. Airline passengers should also prepare for flight delays.

Travel conditions in New York City and its suburbs will improve late Friday night and Saturday as the accumulating snow shifts to eastern Massachusetts and coastal Maine. This includes Boston and Portland.

In the wake of the snow band, fresh cold air will pour across the entire Northeast on Saturday. Brisk winds will further add to the chill on Sunday.

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