Red Flag Warning Issued as Chicago Faces Severe Storm Threat

Warm temperatures, low humidity, and high winds create critical fire conditions in the region.

Published on Feb. 21, 2026

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The National Weather Service has issued a red flag warning for several counties in the Chicago area, effective Wednesday morning. Warm temperatures in the 60s, low humidity, and winds up to 50 mph are creating 'critical fire conditions' that could lead to rapidly spreading wildfires. The threat of severe storms, including the potential for tornadoes, damaging winds, and hail, is also looming for Thursday afternoon, especially south of Kankakee.

Why it matters

Red flag warnings are issued when weather conditions are primed for fast-moving and dangerous wildfires. This warning highlights the heightened risk of fire spread in the region, prompting officials to advise against any outdoor burning or activities that could spark a blaze. The severe storm threat on Thursday also raises concerns about public safety and potential property damage.

The details

The red flag warning will be in effect from 10 a.m. to 8 p.m. on Wednesday for McHenry, DeKalb, Kane, LaSalle, Kendall, and Grundy Counties. Winds are expected to gust up to 45 mph, especially west of the Fox Valley and I-55 corridor. On Thursday, a 'slight' risk of severe weather is forecast for areas south and east of Chicago, with a 'marginal' threat in Cook, Kankakee, Will, and LaSalle Counties. Storms could produce tornadoes, damaging winds, and hail.

  • The red flag warning will go into effect at 10 a.m. on Wednesday, February 18, 2026.
  • The red flag warning will remain in effect until 8 p.m. on Wednesday, February 18, 2026.
  • The severe storm threat is expected to develop by Thursday afternoon, around 2 p.m., on February 19, 2026.
  • Storms are expected to move out of the region by around 5 p.m. on Thursday, February 19, 2026.

The players

National Weather Service

The federal agency responsible for issuing weather warnings and forecasts, including the red flag warning for the Chicago area.

Alicia Roman

NBC 5 Storm Team Meteorologist who provided analysis and commentary on the weather conditions.

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What they’re saying

“Very dry, very windy”

— Alicia Roman, NBC 5 Storm Team Meteorologist (NBC 5 Chicago)

“The combination of unseasonably warm and exceptionally dry conditions and gusty winds will result in a significant risk for grass and brush fire spread this afternoon. Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.”

— National Weather Service (National Weather Service)

What’s next

The National Weather Service will continue to monitor the situation and provide updates on the severe storm threat for Thursday. Residents in the affected areas are advised to stay tuned to local media and be prepared to take shelter if severe storms develop.

The takeaway

This red flag warning highlights the heightened risk of wildfires in the Chicago region due to the combination of warm temperatures, low humidity, and strong winds. It serves as a reminder for residents to exercise extreme caution with any outdoor activities that could potentially spark a blaze, and to heed the advice of local officials to help prevent devastating fires.