Springlike Weekend, Then Turning Wintry

Friday morning

A southwesterly flow aloft from Texas to New England through the weekend assure unseasonably warm weather for most of the I-95 corridor. There is a cold front from eastern Canada that will slide slowly south and stall in central New England. The front could jump back north on Sunday, but there is much uncertainty about temperatures. This map shows a projection from last night's European model. It shows huge temperature differences in a short distance across northern and central New England:

While the East Coast has exceptionally mild weather, there is a possibility for pockets of dense fog as the warm, increasingly humid air passes over the cold ground. You may have seen this effect in operation in spring and early summer at the seashore.

Meanwhile, cold air will advance across the Great Lakes... slowly at first, then more quickly during the second half of the weekend. Along and ahead of the cold front, locally heavy rain and even thunderstorms. There can be some flash flooding; also damaging winds in some thunderstorms. Behind the cold front there will be a transition from rain, to hazardous ice then to snow. Some places from Kansas to Wisconsin can get 6-12 inches of snow. When the cold front goes off the East coast Monday and Monday night, dry cold air will flow into the Northeast and the warm spell will be over. Here's the video forecast: