At least 20 vehicles have been involved in a multi-vehicle pileup that has closed part of Interstate 39 in Wisconsin.
Travel was hazardous in the region as a snow storm continued late Tuesday afternoon.
The crash was reported about 2 p.m. CST and closed all northbound lanes of I-39/U.S. 51 northbound at County Road C near Knowlton, Wis., in Marathon County, the Wisconsin Department of Transportation said on its website.
There was a quarter-of-a-mile visibility and snow at the time of the crashes, AccuWeather.com Meteorologist Frank Strait said.
"The snow is starting to wind down there but it will snow there for the next two to three hours," Strait said.
A spokesman at the Marathon County Sheriff's Department said no one was immediately available about the incident because the department was very busy handling calls.
The transportation department issued a travel alert in northwest Wisconsin due to hazardous road conditions.
U.S. 51 and Wisconsin 39 were also closed because of crashes, the Wisconsin DOT said.
Up to 11 inches of snow had been reported by Tuesday evening in the region, the National Weather Service said. A 9-inch snowfall in Eau Claire, Wis., set a new record for Jan. 14, breaking the 7-inch snow recorded there in 1930.
Another visit from the Polar Vortex will deliver unseasonably cool air to the Midwest, preceded by rounds of thunderstorms, including severe weather.
Heat-related dangers will be on the rise over the weekend for much of the Northwest as scorching heat settles in.
As the Northeast continues to clean up from destructive storms early this week, more rounds of severe weather and flash flooding loom for early next week.
Parts of the South will get major relief from heat, humidity and storms next week while other locations will be at greater risk for flash flooding.
Yellowstone National Park's Firehole Lake Drive was closed Thursday, July 10, as portions of the roadway's asphalt melted amid the summer's recent heat wave in the Northwest.
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114 degrees -- hottest ever for Wyoming.