To: Kenneth E. Phillipps who wrote (20414 ) 1/19/2008 12:39:54 PM From: Ann Corrigan Respond to of 224759 Global Warming effect >B-r-r utal: Upper Midwest Locked In Deep Freeze Air Temperature May Hit 25 Below Overnight In Northwest Wisconsin; 14 Below in Minnesota, Minus 3 In Chicago CHICAGO (CBS) ? Bitter, dangerous cold has settled across the Chicago area and its neighbors in the Upper Midwest, making just walking a block a miserable experience. A wind chill advisory is in effect for all of northern Illinois and most of Indiana, as well as the entire states of Wisconsin and Minnesota and most of Michigan. The forecast high for the day in Chicago is a mere 7 degrees, with an overnight low of 3 below zero. But with northwest winds at 20 to 25 mph, the wind chills will make it feel as if it were 20 to 25 below. Thus far this January, people across the Chicago area have been treated to a warm spell with one day where the mercury reached a shocking 65 degrees. But with the temperatures plummeting beginning last night, Chicagoans have been preparing. "I probably won't go outside at all, so I won't have to think about what I have to wear," said Chicagoan Meredith Shaiv. But the fact that the cold will only last a couple of days does not diminish its danger. When air temperatures drop below zero, hospital rooms expect to be busy with cases of frostbite. Doctors say it's important to protect your skin, even if you're only outside for a short time. "Supposedly tonight it's going to be negative 15 degree windchill," Mitton said. "Negative 15 degree wind chill you can get frost bite in 20 minutes." Dr. Janet Lin, a physician at the University of Illinois-Chicago Medical Center, said, "you're freezing the cells and so the pain is probably the first thing that you actually see. The worrisome thing is when you don't; when you actually freeze the cells, then the cells could actually die off." Anyone going out is encouraged to dress in layers with socks, hats and gloves. Click here for facts on frostbite and hypothermia. In the Rockford area west of Chicago, the air temperature is expected to drop to 9 below zero overnight. In northwestern Wisconsin, the forecast high is 5 below zero in some areas for both Saturday and Sunday. For Saturday night, the overnight air temperatures – not wind chills, but air temperatures – are expected to drop to 25 below in that area. The cold will make for a difficult game for both players and spectators when the Green Bay Packers play the New York Giants at Lambeau Field. Minnesota has it equally hard. At Minneapolis' Crystal Airport, the temperature at 6:15 a.m. was 14 below zero. The forecast high for Minneapolis on Saturday is 2 below zero, on Sunday 0 degrees, CBS station WCCO-TV reported. In Detroit, the temperatures are well below normal, but almost balmy relative to the rest of the Upper Midwest. Highs there are expected to topping out at 16 degrees with scattered snow showers, CBS station WWJ-TV reported. The Associated Press contributed to this report.<