A snowstorm of up to six inches is forecast for the relocated Monday night NFL game between the Chicago Bears and Minnesota Vikings at TCF Bank Stadium in Minneapolis.

Snow began falling Monday morning in the Minneapolis area in the afternoon and through the game, which starts at 7:30 p.m. local time. Volunteers have been working all week to clear the open-air stadium of a snow buildup that began last weekend and dumped 17 inches, with another smaller storm during the week.

Game-time temperature is expected to be no higher than 20 degrees, with a wind chill factor of minus-1. The field at TCF Bank Stadium is not heated, and players have complained about how hard it is.

Minnesota Vikings punter Chris Kluwe went through a walkthrough at the outdoor stadium on Sunday and then let his thoughts be known on his Twitter account.

"Serious time — All respect to the people that cleared the field and got it ready, you did an amazing job," Kluwe wrote. "That being said, it's unplayable. The field is as hard as concrete an hour and a half after they took the tarp off, and anyone that hits their head is getting a concussion.

"I find it interesting that the NFL can claim an emphasis on player safety, and then tell us the field is fine. It's beyond hypocritical. I can only hope, however unlikely, that no one gets catastrophically injured at the trainwreck that's about to take place tomorrow night."

The field hasn't hosted a football game since the Golden Gophers played their last home game on Nov. 27.

Oddsmakers have the visiting Bears giving nine points to the Vikings. The total is sitting at 33, a point below where most books opened the number at the start of the week.