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Lake Effect.

I thought this was a neat image. I think it was back on Jan. 22nd. The 21st and 22nd had some nasty lake effect weather, and I think it was the cause of a 80something car pile up in Ohio on the 21st, as well as a number of dozen or two car crashes on highways here in Michigan on the 21st and 22nd. I got stuck in traffic as three semi trucks jack knifed and shut down an interstate highway on the 21st.

Yes, it's the Great Lakes. Throughout that week we had a strong NW wind blowing out of Canada.

Basically the air/water of the Lakes is warmer than the air/land around it. (Water's specific heat is much higher.) As the weather systems move across the Lakes, they fill up with water (warmer air holds more water than colder air). As the systems touch land, where it's colder, the now water filled air cools and hits it's dew point. Water freezes, and snow happens.

Of course now it's 40(F) and raining, (as well as thunder and lightning, which is a bit strange).

It has been pretty cold the last few days, so end of days sounds about accurate.