Summary (tl;dr)

Chicago is currently experiencing severe thunderstorms with multiple warnings and watches in effect, leading to concerns about flash flooding, strong winds, hail, and a potential tornado threat.

Essential Background

The Midwest and Great Lakes region have been anticipating severe weather, with a Level 2 out of 5 risk of severe storms for northern Illinois, including Chicago. Forecasters had predicted a batch of showers and storms to roll through the region starting late Sunday morning and continuing into the afternoon.

The Full Story

On Sunday, August 9, 2026, the Chicago area was hit by severe weather, marking the beginning of a multi-day storm event. Severe Thunderstorm Warnings have been issued for various parts of Cook, DuPage, Kane, Kendall, and Will counties, with some warnings active until the early afternoon. These storms are bringing wind gusts topping 60 miles per hour and quarter-sized hail. Ground stops were ordered at O'Hare and Midway international airports due to the storms, causing significant delays. A second round of severe weather is anticipated for Sunday night, with flash flooding being a major concern, as torrential downpours could result in 4 to 7 inches of rain in some areas. There is also a window for supercell development, raising the risk of tornadoes. Severe Thunderstorm Watches have been extended for Cook and DuPage counties until 4 p.m., and other areas like LaPorte County in northwest Indiana are also under watches.

Why It Matters

The severe weather poses significant risks to residents and infrastructure, including potential widespread power outages, property damage from strong winds and hail, and dangerous driving conditions due to flash flooding. The threat of tornadoes, while uncertain in exact location, necessitates immediate preparedness and vigilance. Disruptions to air travel at major hubs like O'Hare and Midway are impacting travelers, while the ongoing nature of the storms through the week suggests continued hazards for the region. Public safety officials are urging residents to stay alert, monitor official weather updates, and be prepared to take shelter.

Geographic Location

• Chicago, Cook County, Illinois, United States (severe thunderstorms, flash flooding, potential tornadoes, airport ground stops)
• Northern Cook County, Illinois, United States (severe thunderstorm warning)
• Northern DuPage County, Illinois, United States (severe thunderstorm warning, extended watch)
• East Central Kane County, Illinois, United States (severe thunderstorm warning)
• Northeast Kendall County, Illinois, United States (severe thunderstorm warning)
• Northwest Will County, Illinois, United States (severe thunderstorm warning)
• Southeast Kane County, Illinois, United States (severe thunderstorm warning)
• Southern DuPage County, Illinois, United States (severe thunderstorm warning)
• LaPorte County, Indiana, United States (severe thunderstorm watch)