Cook County, IL

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From the Forecaster

Severe Thunderstorm Threat Today

Another round of thunderstorms is expected in the area this afternoon through tonight. Like yesterday, some storms will likely be severe and may also result in flash flooding.

Image Description

Headline: Severe Thunderstorm Threat Today. Sub Headline: Some storms will likely be severe and may result in flash flooding. What To Expect: Scattered to Numerous Thunderstorms. Level 2/5 severe weather threat and level 2/4 flooding threat. Primary Storm Time Window: 3 PM - 5 AM. Severe Storms Capable Of Producing: Damaging winds and hail. A threat for tornadoes also cannot be ruled out this afternoon and evening. Torrential Rainfall. May cause flash flooding of roads, low-lying areas, fields, and basements, and cause rapid stream/creek rises. All Storms Can Produce: Lightning Strikes. Soaking Downpours. Gusty Winds. What To Do. Have multiple ways to get weather warnings. Use caution when driving in heavy rain. Graphic Created: Monday, August 10, 2026 4:52 AM CDT

Chicago Area Forecast Discussion

Seven-day Weather Risk Overview

The graphic shows the daily risk summary for 7 days. Daily risk is based on highest risk factor for that day.

	Mon 8/10	Tue 8/11	Wed 8/12	Thu 8/13	Fri 8/14	Sat 8/15	Sun 8/16
risk level	out of 10	out of 10	out of 10	out of 10	out of 10	out of 10	out of 10

No risk

Low risk

High risk

See the detailed risk analysis

Radar

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dBz	Intensity
−35–0	Extremely light (drizzle/snow)
0–20	Very light precipitation or general clutter
20–40	Light precipitation
40–50	Moderate precipitation
50–65	Heavy precipitation or some hail
>65	Extremely heavy precipitation including water-coated hail

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Weather Forecasting Office

Chicago Forecast Office