While many Wisconsin schools — including Madison College and the Madison Metropolitan School District — have already announced Tuesday closures due to the extreme cold, the University of Wisconsin-Madison is planning to "operate normally.

The advisory is in effect for most counties 3 a.m. Sunday until noon Tuesday. It begins for several others, including Milwaukee, at 6 p.m. Sunday.

As wind chills hit dangerous levels, the decision to close schools becomes critical. Kevin Wagner, a lead meteorologist with the National Weather Service, explains how those decisions are made.

Several schools and organizations have already announced closures for Tuesday. You can view a complete list compiled by our

Very cold air will be moving in this weekend into next week. A cold weather advisory has been issued for southeast Wisconsin.

With extremely cold temperatures and wind chills blasting the Milwaukee area — and much of Wisconsin — some schools have decided to close for the day Tuesday.

Wisconsin continues to see freezing temperatures this week. Here's how NWS meteorologists calculate wind chill.

Arctic air continues to impact southern Wisconsin with even colder temperatures Tuesday. Wind chills are expected to reach between 30 and 35 below zero, prompting an extreme cold warning from the National Weather Service.

Southeastern Wisconsin residents urged to take precautions as arctic air mass brings dangerous wind chills overnight

On Monday at 9:27 p.m. the National Weather Service issued an updated extreme cold warning valid for Tuesday between midnight and noon. The warning is for the Madison Area as

Temperatures are expected to be below zero Sunday and Monday in central Wisconsin with wind chills reaching around 30 degrees below zero.