It may be in the 20s Thursday, but don’t be fooled: an Arctic front headed to the Chicago area by nighttime will send temperatures plunging overnight, with perilous wind chill values that could cause frostbite in as little as 10 minutes.
According to the National Weather Service, the coldest conditions will come starting at about 3 a.m., when an extreme cold warning goes into effect for all of northeastern Illinois.
“Dangerously cold wind chills as low as 30 to 40 below zero expected,” the NWS said. “Dress in layers including a hat, face mask, and gloves if you must go outside.”
The warning led more than 100 schools across the city and suburbs to move to e-learning or fully close Friday, including Chicago Public Schools, the largest district in the state.
According to NBC 5 Storm Team Meteorologist Kevin Jeanes, Friday is likely to break weather records, and could be Chicago’s coldest day in years.
As the cold approaches, here’s a look at when and where it will be the worst, and what to know.
Extreme cold timeline
While Thursday afternoon will see highs in the 20s, a sharp drop in temperatures and wind chills will come overnight, with a “brutally cold air mass” moving in around midnight.
At 3 a.m., an extreme cold warning for all of northeastern Illinois and parts of southeastern Wisconsin will go into effect.
By 6 a.m. Friday, temperatures will have nosedived below zero, with air temperatures in Chicago predicted to be around -10 degrees. Those readings will be even lower in counties to the north and west.
And, wind chill values will be even worse than that, especially in parts north and west of I-55, the NWS warned.
Friday morning in Woodstock, the predicted “feels-like” temperature was -40 degrees. The temperature was expected to feel like -39 in DeKalb, -37 in DuPage, and -38 in Waukegan.
In parts southeast of I-55, and in northwest Indiana, wind chills would range from -20 to -30.
The worst of the cold was expected to last through 12 p.m. Friday, though the afternoon wouldn’t be much better, Roman said, with a high of -2 degrees.
“Some areas will likely see actual temps remain below zero all day,” the NWS said.
The NWS added that there was also “high confidence” in a period of bitter cold with dangerous temperatures through Saturday morning.
Saturday, the high temperature was 11 degrees, and Sunday, the predicted high was 18, with snow chances both days as a major winter storm makes its way across the country.
Next week, temperatures will rise, but only into the teens, the NBC 5 Storm Team said.
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