Wind Chill Advisory much of the Chicago area tonight until 10AM CST Saturday

Update 11AM CST…

Wind Chill Advisory expired. Still cold over the Chicago area with afternoon wind chills in the +5 to -10-degree range, but not close to Advisory criteria.

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A Wind Chill Advisory is in effect tonight until 10AM CST Saturday morning for northeast Illinois and northwest Indiana counties away from Lake Michigan (light-blue-shaded area on map below). Dangerous wind chills -20 to -30-degrees will likely occur in areas farther inland from Lake Michigan, while counties adjacent to the lake including the city of Chicago will experience wind chills in the -10 to -15-degree range and even a little colder in spots.

The combination of Arctic-source cold high pressure overhead, a solid snow cover, and clear skies will combine to allow temperatures to drop to -10 to -20-degrees away from the lake and zero to 5 or even 10-below-zero close in along the lake and in Chicago. Northerly winds 5 to 10 mph will make temperatures “feel” even 5 to 10-degrees colder. If outside during this time, make sure to protect exposed skin such as ears, cheeks and hands, as frostbite can develop in less than 30 minutes.

Map of Forecast Area