Warm weather could cause ice jams

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Meanwhile, a ferry connecting cities in the USA and Canada across the St. Clair River has been shut down indefinitely due to damage by an ice jam to its Canadian dock.

In much of northern and western Pennsylvania, upstate NY and northern New England, the rain will change to snow on Friday or Friday night, adding to the wintry mess.

More than an inch of rain has already fallen in Upstate New York, western Pennsylvania, southeastern OH and parts of West Virginia which combined with the melting snow has resulted in numerous reports of flooding, including river flooding and ice jams.

Winter Weather Advisory area
Winter Weather Advisory area

At 8:32 a.m. Friday, Doppler radar indicated heavy rain that will cause flooding.

The second round of flooding in the area comes as a result of the potential ice blockage on the St. Clair River aided by strong northerly flow.

Now Friday night, once the cold front moves in, temperatures drop dramatically, creating a flash freeze.

The National Weather Service is advising motorists to exercise caution and urn around if they encounter flooded roadways as most flood deaths occur in vehicles.

"People should expect travel conditions to range from poor to extremely hard from Saturday to Saturday night in the storm's wake", according to AccuWeather's senior meteorologist Alex Sosnowski. Winds gusts of 45-55 miles per hour could also develop, particularly on the South Coast. One to one and a half inches of rain has already fallen.

Snowmelt or rain on top of snow can occur, along with the breakup of a jam, and increase the level of flooding. Lows will be around 40 degrees, with a south wind 10 to 14 miles per hour.

"Rain will change to a brief period of freezing rain between 9 a.m. and noon", the weather service said.

Sunday will be mostly sunny, with a high around 26 and a low of 9. This is the kind of ice you'd expect to see in Vermont, New Hampshire or Maine.