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Severe Thunderstorm Watch Issued for Parts of Illinois and Indiana

August 22, 2026 · wweather1 editorial · 1 min read

The National Weather Service in Chicago has issued a severe thunderstorm watch for multiple counties across Illinois and Indiana.

The National Weather Service issued Severe Thunderstorm Watch 610 on August 21 at 8:35 PM CDT. The watch remains in effect until August 21 at 10:00 PM CDT.

The alert covers 14 counties in Illinois, including Cook, De Kalb, DuPage, Ford, Grundy, Iroquois, Kane, Kankakee, Kendall, La Salle, Lee, Livingston, Ogle, and Will counties. Additionally, two counties in northwest Indiana are included: Lake and Newton.

Numerous cities are located within the watch area, including Chicago, Aurora, Joliet, Naperville, Elgin, Gary, Hammond, and Merrillville. Residents in these locations are advised to monitor weather conditions as the watch remains active.

Why it is dangerous and what to do

⚠️ Safety
• Monitor local weather forecasts and updates from the National Weather Service.
• Stay tuned to a NOAA Weather Radio or local media for further alerts.
• Be prepared to move to a safe indoor shelter if threatening weather approaches.
📊 The numbers, from wweather1 data
Chicago: now +29°, Clear.
That is 6° above the September climate norm.
The record for this date is +33° (1960).
Three-day forecast: 8 September: +29°/+17° · 9 September: +27°/+21° · 10 September: +24°/+17°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.
📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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