Low pressure over the western Great Lakes will track eastward across the region tonight. Snow will spread across central Lower MI, east across Ontario and into western NY overnight. Significant accumulations are possible.
South of the snow area, a mix of rain, freezing rain, sleet, and snow is expected from southern Lower MI and northern OH, east across northern PA. Some accumulation of ice and snow will be possible in these areas.
Further south, mainly rain is expected.
On Friday, the low will track to the northern Mid Atlantic states, then begin to phase with a rapidly deepening low pressure system along the Mid Atlantic coast. As these systems begin to consolidate, colder air will be drawn southward across the region changing the rain or mixed precipitation over to snow across eastern OH and PA during the day on Friday. Some accumulations are possible in these areas.
However, the heavier snowfall on Friday will likely be across NY State where some locations could pick up over a foot of snow. It will become windy as well with blowing and drifting snow across much of western NY.
The storm will bomb out near the New England coast late Friday before moving away form the coast on Saturday. Improving weather conditions are expected Saturday and Sunday as precipitation exits and temperatures moderate.