A storm, which unleashed travel-snarling blizzard conditions in the Plains, will swing through the Northeast Wednesday into Thursday. The storm will bring a period of rain on the coast and everything from heavy snow to a wintry mix and rain inland and farther north.
The nature of the storm will be very complex in the Northeast, and the form of precipitation may change many times over its history in some locations.
Regardless of the form of precipitation, the storm will cause travel disruptions, including slower travel on the ground and flight delays and cancellations.
Travel Impact While rain and not snow is forecast in New York City, the rain can be heavy for a short time and accompanied by gusty wind. As a result, there is the potential for travel delays with the storm early Wednesday.
Some of the worst and longest-lasting effects from rain are in southern New England. The combination of rain and melting snow can lead to urban flooding problems. The action of moist air flowing over snow cover and/or a cold ground can also lead to fog.
A wedge of cold air was be enough to bring a period of accumulating snow from north-central and northeastern Pennsylvania to central interior New England to part of southern Ontario and Quebec. Snow in part of this area could be heavy and wet, even mixed with rain and sleet for a time.
Areas along much of the New York Thruway and the Southern Tier Expressway in New York fall within this regime.
On the upper end of I-95, much of I-93 and northern portions of I-87 and I-91, the advance of warm air and transition to a wintry mix or rain has the potential to stop dead in its tracks.
According to Chief Meteorologist Elliot Abrams, "A conveyer belt of moisture may continue to deposit moisture in the form of heavy snow over portions of Maine, New Hampshire and Vermont Wednesday into nearly the end of the week."
From central and northeastern Pennsylvania to the southern tier of New York to western Massachusetts and northern Connecticut, a few inches to a half a foot of snow accumulated Tuesday night. Much of the snow fell during a several-hour period through early Wednesday morning, rapidly covering roads.
The Storm Will Not Be in a Hurry to Leave A return flow of colder air into the central Appalachians and eastern Great Lakes, combined with lingering moisture, will translate to a change to snow or snow showers Wednesday. This can lead to renewed slippery spots and snow-covered roads.
A southward buckle in winds high in the atmosphere will develop, funneling cold air into the Deep South, and this has the potential to bring the lowest daytime temperatures of the season for the region.
The pattern could put a chill on activities for those spending spring break in Florida or other Southern states.
Depending on how quickly this buckle develops and captures the remaining moisture, a second precipitation event could unfold, in the form of snow in central and southeastern New England Friday.
"It could snow for days in part of northern New England, when factoring in the first part of storm Wednesday and lingering effects into the weekend," Abrams stated.
AccuWeather.com meteorologists will continue to monitor the progress of the storm and the cold air that follows.
This story was originally published at 1:00 p.m. EST Mon., Feb. 25, 2013 and has been updated.
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