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.

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.

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.

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

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

On Monday at 2:34 p.m. the National Weather Service issued an extreme cold warning valid for Tuesday between 3 a.m. and noon. The warning is for Milwaukee, Racine and Kenosha

On Monday at 2:34 p.m. an updated extreme cold warning was issued by the National Weather Service valid for Tuesday between midnight and noon. The warning is for the Madison

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.

Our FIRST ALERT WEATHER DAY continues through today (and beyond) due to the dangerously cold conditions. The National Weather Service has issued a Cold Weather Advisory for all of northeast Wisconsin until midnight. Today’s actual high temperatures will be close to zero, with wind chills mainly -15 to -30.