A blast of cold air has overtaken southern Wisconsin (click on the image for a larger view). The surface temperature for each location is highlighted in red. Below the image is the NWS Wind Chill chart that can be used to compute the wind chill from temperature and wind speed. For a list of wind chills around Wisconsin (in text), click here.
Bitterly cold wind chills of 10 to 25 degrees below zero are expected this morning. A Wind Chill Advisory is in effect.
Cold wind chills between 10 and 20 degrees below zero are expected tonight. Less wind and slightly warmer temperatures due to clouds and light snow exiting the area will keep wind chills a little warmer. Wind chill readings below minus 20 °F usually require the issuance of Wind Chill Advisories.
Here is the specific outlook for south central and southeast Wisconsin through New Year's Day:
New Year's Eve Details:
BELOW: Map for early New Year's Morning, showing cold polar high pressure centered over northern Minnesota.
A cold Tuesday night is anticipated with temperatures between 5 above and 5 below zero in the late evening. These conditions are about 15 to 20 °F colder than normal for the 1st of January in southern Wisconsin. With winds from the northwest at 5 to 10 mph, bitterly cold wind chills of 10 to 20 below zero are expected.