Extreme Cold Warning Issued for Chicago as Polar Vortex Brings Dangerous Temperatures

Residents urged to prepare for bone-chilling cold, school closures, and disrupted transportation

Apr. 11, 2026 at 3:23pm

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A vast, frozen landscape painting in muted blues and grays, with a distant horizon line and a sense of overwhelming scale, conveying the overwhelming power of the extreme cold weather event.The bitter grip of the polar vortex envelops Chicago, as the city braces for a dangerous deep freeze that could bring life-threatening conditions.Chicago Today

An Extreme Cold Warning has been issued for the Chicago area on Friday, with temperatures expected to plummet to -7°F and wind chills as low as -40°F. Local officials are advising residents to take precautions against the dangerous cold, which could bring frostbite in as little as 10 minutes. Several schools have already announced closures, and transportation services like Metra and the South Shore Line will be operating on reduced schedules.

Why it matters

Extreme cold weather events can pose serious risks to public health and safety, especially for vulnerable populations. The polar vortex bringing this cold snap to Chicago could have widespread impacts on infrastructure, transportation, and daily life for residents. Preparing the community and mitigating the effects of the extreme temperatures is crucial.

The details

The Extreme Cold Warning will be in effect from 3 a.m. to noon on Friday, but the cold is expected to linger throughout the day. On Thursday, temperatures will only reach a high of 20°F, dropping to 5°F by midnight. By Friday morning, the mercury is forecast to plummet to -7°F, with wind chills as low as -30 to -40°F. This level of cold can lead to frostbite on exposed skin in as little as 10 minutes.

  • The Extreme Cold Warning will be in effect from 3 a.m. to noon on Friday, April 12, 2026.
  • On Thursday, April 11, 2026, temperatures will reach a high of only 20°F, dropping to 5°F by midnight.
  • On Friday, April 12, 2026, temperatures are expected to reach a low of -7°F, with wind chills as low as -30 to -40°F.

The players

Chicago Officials

Local authorities in Chicago who are issuing the Extreme Cold Warning and advising residents to prepare for the dangerous temperatures.

Metra

The commuter rail system serving the Chicago metropolitan area, which will be operating on a reduced schedule on Friday due to the extreme cold.

South Shore Line

The commuter rail line connecting Chicago to Northwest Indiana, which will also be running on a weekend/holiday schedule on Friday.

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What they’re saying

“We must urge all residents to take this extreme cold seriously and take the necessary precautions to stay safe.”

— Chicago Official

What’s next

The extreme cold is expected to continue through the weekend, with a major storm system bringing potential snow to the region on Saturday and Monday.

The takeaway

This polar vortex event highlights the importance of community preparedness and resilience in the face of extreme weather. Residents must stay informed, heed official warnings, and take proactive steps to protect themselves and their loved ones from the dangers of the bitter cold.