(Bloomberg) — A winter storm is threatening to drop heavy snow on New York City and surrounding areas, potentially snarling post-Christmas holiday weekend travel.

The city’s five boroughs, Westchester, southern Connecticut and northeastern New Jersey may see snow accumulations between 4 inches (10.2 centimeters) and 8 inches as the storm moves through the area from Friday at about 4 p.m. through the following day at 1 p.m., according to the National Weather Service. New York City issued a travel advisory for the duration of the storm as cold temperatures limit snowmelt, increasing the risk of slippery and hazardous road conditions.

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“The hazardous conditions could impact the Friday evening commute,” the weather service said in the notice issued on Thursday.

The winter watch extends into Philadelphia with the storm expected to move offshore into the mid-Atlantic by Saturday morning, the service said. Wintry precipitation will give way to freezing rain as the storm moves south.

A potentially stronger cold front will move across the Northeast, including the Washington area, toward the end of the weekend, which could lead to blustery conditions during the last few days of the year.

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