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Article updated: 1/21/2013 9:04 AM

Wind chills to plummet to minus-25

By Lee Filas

A deep freeze has rolled in to the Chicago area, and people should be prepared for negative temperatures and wind chills not felt in more than a year.

The National Weather Service has issued a wind chill advisory for most of Illinois from 6 p.m. this evening and runs through 9 a.m. Tuesday.

Cook, McHenry, Lake, Kane and DuPage counties are all under the wind chill advisory.

Wind chill values overnight could reach negative-25 degrees, meteorologists warn, and the air will be cold enough to cause exposed skin to frostbite in one half-hour.

Officials are urging residents in the affected areas to take steps to avoid be exposed to the elements for prolonged time. People are urged to bundle up with a hat and gloves if outdoor travel is unavoidable, and wear layers of clothing to stay warm.

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