The National Weather Service in the Dakotas and Minnesota says it's sticking with the "extreme cold" warnings that it tested last winter. Meteorologists say the winter weather can be dangerously cold even without wind. Forecasters will issue the warning when the temperature could feel like 30 below or colder.
Missing Wisconsin teen may be in Minnesota, authorities say
The Minnesota BCA has put out an alert to find Michael Atkins, 17.