Freezing rain, sleet, and snow will be possible Tuesday from the Appalachians through the Upper Northeast. Moderate to heavy rainfall, as well as some flooding will be possible for the Upper Northeast and the Pacific Northwest coasts.

Appalachians through Upper Northeast: A strong Nor’easter storm is forecast to begin the most significant precipitation early Tuesday morning for much of the Northeast US. The low pressure just off of the East Coast near the Carolinas will strengthen significantly and steal some energy from the clipper low in the Great Lakes. This will set up a strong cyclone just offshore somewhere between New Jersey to Long Island. The high pressure from yesterday, meanwhile, will move upstream of this low. This will create a block that will ensure the low pressure cyclone lingers around the Northeast to cause plentiful amounts of mixed winter precipitation to fall for 2-3 days. Current estimates for Tuesday through Wednesday morning look to put the heaviest snowfall from the borders of Pennsylvania and New Jersey up through Maine. There still lies much uncertainty in this forecast, however. Models are still not all coming together with a tight consensus, and with temperatures hovering near freezing along with a warm mid-layer, this event looks to be a very messy forecast. Nonetheless, areas inland with colder temperatures could expect amounts between 6-12 inches of snowfall through early Wednesday morning, while much of this region will see a snow, sleet, and freezing rain mixture with varying amounts of snowfall of 4-10 inches, and freezing precipitation between a glazing to isolated spots of a quarter of an inch. Winds will also be moderate to strong, with coastal areas seeing as high as 30-40 mph, and onshore winds closer to 15-25 mph. Low visibilities and power outages are expected.

Northeast Coastline: With plentiful moisture surging into the region and warmer temperatures along the coastline, some precipitation will remain primarily rainfall. Because of this, 2-3 inches of precipitation along the coastline from Delaware to Maine is expected, with isolated heavier amounts within. As stated above, strong winds are also possible, helping to cause localized and flash flooding, and low visibilities.

Pacific Northwest Coastline: Another round of moderate to heavy rainfall is expected Northwestern Oregon up through Washington. Another 2-4 inches will be possible with isolated heavier amounts is possible.