It is not only dramatically colder air headed back to the Northeast, but also snow in some communities.
The storm that blanketed Nebraska and Wisconsin with up to a half foot of snow Sunday night and Monday and will continue to move northeastward Tuesday into the Northeast.
A few waves of low pressure will streak northward through Tuesday to bring the opportunity of snow from Detroit early Tuesday morning to New England by Tuesday night.
Most of the snow will accumulate on grassy surfaces and will initially melt on roads due to recent warmth. However, with any snow falling at night and arrival of colder air, some roads will turn slushy. Slick conditions will even develop where the snow comes down heavily for a time.
Similar to the past couple of nights, roads will initially be wet before turning slushy. If any of the slush freezes, it would first happen on bridges and overpasses.
The zone of rain changing to snow will spread east across the northern Appalachians Tuesday night.
Rain will then mix with or end as wet snow in a west-to-east fashion across the central and northern Appalachians of the Northeast Tuesday through Tuesday night.
While a substantial amount of snow is not expected, some places could still pick up a quick coating to a couple of inches. The higher terrain has the best opportunity of receiving the accumulating snow, mainly on grassy surfaces.
Cold air will not catch up to the rain quick enough to return snow to the I-95 corridor of the Northeast.
Before the snow falls, enough rain will pour down to heighten concerns of flash flooding in the Midwest and Northeast where snow is still covering the ground or where rivers remain swollen from recent rain.
The snow threat will diminish towards the end of the week but cooler air will stick around.
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