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Ice storm, snow, flooding and a freeze-up to create dangers in northeastern US

By Alex Sosnowski, AccuWeather senior meteorologist

Published Jan 10, 2018 4:47 PM EDT | Updated Jul 1, 2019 5:15 PM EDT

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You will be redirected to photos of ice-jam flooding and major travel disruptions that resulted across the eastern United States momentarily.

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A multi-faceted storm will jam a thaw, heavy rain and flooding, as well as ice, snow and a freeze-up into the northeastern United States into Saturday morning.

The storm may bring major travel disruptions related to both warm and wintry weather conditions throughout the region.

Some areas will be at risk for flooding, while others may face power outages and property damage related to freezing rain, followed by clinging snow and a freeze-up.

Rapid thaw and heavy rain to raise risk of flooding in coastal areas

Rounds of heavy rain and fog will be the triggers for airline and ground transportation delays along the New England coast.

Some motorists may encounter flooded roadways. The risk of urban flooding will not be limited to areas with existing heavy snowcover.

The ground remains frozen in many areas and is causing the heavy rain to run off rather than be absorbed.

There have been dozens of flash, urban and stream flooding reports from Thursday night to Friday evening from Ohio and West Virginia to western Pennsylvania and upstate New York. Ice jams have also been occurring.

Static Saturday NE

The thaw may be rapid enough, combined with drenching rain to lead to more ice jams on some of the rivers and streams. Small streams that are free of ice may quickly spill out of their banks. Motorists traveling along secondary roads in mountainous areas should be on the lookout for debris in their path.

"There is also a risk of roof collapses in New England, where up to a couple of feet of snow remains and the heavy rain adds more weight," according to AccuWeather Senior Meteorologist Dave Samuhel.

Flat roofs will be at greatest risk of collapse.

Storm's cold side to bring change to ice, snow over interior

Following a surge of warmth with rain, colder air will rapidly invade the region, while the storm is still in progress. In a matter of a few hours, temperatures will plunge from balmy levels in the 60s and 50s F to the 30s and 20s.

The cold air caught up with the rain and caused a change to ice and snow from the Appalachians to the eastern Great Lakes on Friday night.

Motorists on the highways from West Virginia to Pennsylvania, much of upstate New York and western and northern New England will be at risk for getting caught up in ice and snow into Saturday morning.

Because of the rapidly changing weather conditions, people may slide off of area roads and be at risk for becoming stranded.

People can check their local hourly AccuWeather forecast to get a handle on when the rapid temperature drop and wintry precipitation will begin.

Road crews will not be able to take action until freezing and frozen precipitation begin due to the likelihood of treatment material being washed away by plain rain.

The period of freezing rain may be held to a few hours, which may restrict how much ice adheres to trees and power lines. Where more sleet than freezing rain falls, there will be a lower risk of regional power outages.

However, where several inches of snow falls and clings to these surfaces after a period of freezing rain, a disaster may unfold in some communities.

Cities that may blanketed by snow into Saturday afternoon include Syracuse, New York; Burlington, Vermont; Caribou, Maine; and Montreal.

Rapid freeze-up to follow storm throughout the Northeast

People should expect travel conditions to range from poor to extremely difficult and dangerous from west to east into Saturday night in the storm's wake.

Even where more snow or sleet occurs and spares some areas from a heavy accumulation of freezing rain, the temperature plunge in the wake of the storm will make it difficult to remove all of the wintry accumulation from area roads and sidewalks.

RELATED:

Reports: Massive winter storm spurs ice-jam flooding and travel-snarling snow, ice in eastern US
Preparing for the costliest weather disaster in the US: How to stay safe before, during and after a flood
Ice floes, jams can pose major dangers during winter and spring
How to survive a power outage in winter
Tips to use ice melt products properly and lower the risks they pose to pets, property
Fresh wave of cold air to freeze central, eastern US through midweek

The rapid freeze-up will occur in the Appalachians into Saturday morning.

Airports, including the major hubs at Pittsburgh, Detroit and Cincinnati, may be in cleanup mode, while airlines may be in recovery mode this weekend.

Even areas in the I-95 corridor can expect areas of moisture and standing water to freeze later Saturday and Saturday night. Motorists and pedestrians from Washington, D.C., to Philadelphia, New York City and Boston should be on the lookout for patches of ice.

Fans heading to the NFL game in Philadelphia should not be deceived by the warm, near-50-degree start to the day. Temperatures are projected to fall through the 20s as the late-afternoon game progresses. Frigid air will also make the trip to Foxboro, Massachusetts by Saturday evening.

By Sunday, high temperatures are forecast to be no better than the teens in the Appalachians and the lower 30s along much of I-95. Low temperatures Sunday night are projected to range from subzero north and west to near 20 along the mid-Atlantic coast.

New storm may spin up next week

AccuWeather meteorologists are monitoring the potential for another winter storm during the middle part of next week. That storm may unload heavy snow across the interior mid-Atlantic and New England and perhaps a combination of rain and snow along the coast.

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