Chicago storms trigger flood warnings and widespread power outages

Severe storms hit the Chicago area on July 3–4, 2026, downing trees, leaving tens of thousands without power, and triggering multiple flood warnings as heavy rain flooded roads, parks, and holiday venues. Wind gusts reached up to 70 mph, forcing suburbs to cancel or postpone Fourth of July fireworks and festivals.

The severe weather arrived after four consecutive days of 90-degree heat, ending a punishing heat wave just as families prepared for Independence Day weekend. Officials warned that creeks, streams, and underpasses could quickly become dangerous as rainfall stacked on ground already saturated from earlier downpours.

Key Takeaways

• More than 70,000 people were left without power after Friday storms, with ComEd reporting roughly 122,000 customers impacted overall.
• Wind gusts of up to 70 mph uprooted trees from Harvey to Chicago to Sugar Grove, and Arlington Heights reported intersections without power.
• Flood warnings and advisories covered parts of Cook, DuPage, Kane, and Will counties as some areas saw 3 to 5 inches of rain.
• Suburbs canceled or postponed July 3 and July 4 fireworks, festivals, and carnivals, including events in Wauconda, Oak Brook, Tinley Park, and Arlington Heights.
• Forecasters warned additional storm rounds could bring damaging winds, torrential downpours, and flash flooding through the holiday weekend.

What Caused the Power Outages and Flooding?

A fast-moving line of severe thunderstorms hit the Chicago area Friday afternoon, with the National Weather Service warning residents in Chicago, Evanston, and Cicero that wind gusts could reach 70 miles per hour. The winds uprooted trees across the region, damaged structures, and brought down power lines that utility crews scrambled to repair.

ComEd spokesperson Michelle Gonzalez said the storm impacted about 122,000 customers, with roughly 55,000 still without electricity as of 8 p.m. Friday. NBC 5 Chicago reported outages topping 70,000 at the peak of the severe weather. Parts of Kane County received 3 to 5 inches of rain overnight, and Notify Chicago issued a flood advisory after 2 p.m. Friday noting that 2 inches had already fallen in Cook County.

Which Holiday Events Were Canceled?

Flooding and storm damage forced widespread changes to Fourth of July plans. Footage showed water inside Wrigley Field during a Cubs-Cardinals game Friday, while Tinley Park closed its Country Fest to assess damage. Wauconda postponed fireworks after 2.5 inches of rain flooded the launch and spectator areas.

Oak Park officials canceled Taste of Oak Brook 2026, including fireworks, a drone show, and live entertainment, citing extensive flooding, safety issues, and electrical hazards. Arlington Heights briefly closed its Frontier Days carnival before reopening festival grounds, though concessions and stages stayed shuttered while crews cleared debris.

What Flood Warnings Are in Effect?

Notify Chicago sent a flood advisory alert Friday just after 2 p.m., in effect until at least 5:15 p.m., warning that 2 inches of rain had already fallen in Cook County. Authorities said creeks and streams could overflow, and underpasses and roads could become flooded.

FOX 32 Chicago reported active flood warnings for Cook, Will, and Lake counties, with trees down near Elmhurst and Villa Park and high-standing water in Sugar Grove, Sandwich, Aurora, and Montgomery. Chicago residents were also asked to limit water use after the Metropolitan Water Reclamation District issued an Overflow Action Day Alert.

Could More Storms Disrupt July 4 Celebrations?

FOX 32 Chicago forecasters said storm chances would continue through the Fourth of July weekend, with warm temperatures, humidity, and the potential for severe weather and heavy rain. Both holiday days carried some risk that any storm could become severe, with damaging winds and heavy rainfall among the primary hazards.

Modern warning systems—including NWS mobile alerts and municipal notification tools like Notify Chicago—are increasingly central to how residents track evolving extreme weather and emergency tech. For the latest official guidance, see the NBC 5 Chicago storm coverage.