Milwaukee faced extreme wind chills and a cold weather advisory, with a slight chance of snow and low temperatures forecasted.

The Milwaukee County Medical Examiner's office is investigating the death of an 80-year-old man who likely died of hypothermia early Sunday morning.

The center at 12th and Vliet is open from 8 a.m. to 5:30 p.m. on Monday and Tuesday due to the cold. Nick Tomaro with the Milwaukee Health Department said more than 100 people took advantage of the center on day one. Darnell Bonner said on Sunday, he was rushed to the hospital for hypothermia while waiting for a shelter to open.

Milwaukee had its coldest Jan. 21 since 1984 on Tuesday as the city, along with the rest of the state, was under a dangerous Extreme Cold Warning. According to Milwaukee-Sullivan National Weather Service meteorologist Taylor Patterson, Milwaukee reached its lowest air temperature of the day at 7:34 a.m., at minus-10.

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.

An "artic air mass" will be moving into the region from Canada as we head into the weekend, causing temperatures to tumble.

A weather alert was issued by the National Weather Service on Wednesday at 9:06 p.m. for snow until 11 p.m. The alert is for Waukesha, Milwaukee, Rock, Walworth, Racine and

Light snow showers will move across southern Wisconsin until 2 or 3 a.m. on Thursday, amounting to up to two inches of snow.

Roughly 40 million people from Texas to the Carolinas are under winter weather alerts as a rare winter storm amid bone-chilling temperatures brings potentially historic snowfall to cities unused to harsh,

Like much of the U.S., Wisconsinites woke up Tuesday morning to bitter cold conditions. Many schools and colleges throughout the Milwaukee area closed as the area braced for the dangerous freezing temperatures. But is Wisconsin in a polar vortex? And what is a polar vortex anyways? Here's what to know.

More than 220 million people across the United States are facing dangerous cold that will also open the door for a potentially historic and crippling winter storm that could deliver snow as far south as Florida and the Gulf of Mexico.