A polar vortex will develop over the Great Lakes by Friday night. The vortex will bring a change to colder weather across much of the East. The coldest weather will be across the Upper Midwest where temperatures will be in the teens for highs.
Snow will develop across the Upper Midwest where 1-6 inches of wind blown snow will occur Thursday night into Friday. As the front plows east through the Ohio Valley Friday, the rain showers will change over to snow showers and should give at least a coating to an inch of snow.
When the front reaches the Appalachians, low pressure will form along the front and will bring a swath of snow from northern Pennsylvania into the Northeast Friday night into Saturday. Max snowfall will be around 6 inches across parts of Vermont and New Hampshire.