"That steam rises into the deck of clouds that are above it, and the steam acts as little particles that the water droplets can latch onto and create snow crystals" said Meteorologist Caleb Grunzke of the National Weather Service. "Everything came together perfectly for several inches of snow and major traffic problems."

As of 4 a.m., the Wisconsin Department of Transportation reports ‘good driving conditions’ on major roads in southern Wisconsin, though crashes are still being reported. If you’re heading out this morning, be sure to check road conditions before you go. Visit the Wisconsin Department of Transportation’s 511 map.

Multiple crashes in Wisconsin were reported after snow formed from steam coming from a plant near Menomonie on Thanksgiving.