Severe Thunderstorm Warning for De Kalb and Kane Counties, IL
If you are in immediate danger, call emergency services now.
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NWS Chicago has issued a Severe Thunderstorm Warning for northern De Kalb County and west central Kane County until 4:00 PM CDT on August 21.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Northern Illinois
- Issued
- August 21, 2026
- Issuing authority
- NWS Chicago IL
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Severe Thunderstorm Warning issued by NWS Chicago IL. Effective from August 21 at 2:57 PM CDT until August 21 at 4:00 PM CDT. Alert type code: SVR.
Affected Areas
Northern De Kalb County in north central Illinois and west central Kane County in northeastern Illinois. Locations impacted include DeKalb, Sycamore, Campton Hills, Genoa, Elburn, Cortland, Kirkland, Maple Park, Kingston, Lily Lake, Kaneville, and Virgil.
What You Should Do
Remain alert for a possible tornado. If you spot a tornado, go at once into the basement or small central room in a sturdy structure. Move to an interior room on the lowest floor of a building.
Expected Conditions
At 2:56 PM CDT, a severe thunderstorm was located 5 miles northwest of Sycamore, moving southeast at 20 mph. Hazards include 60 mph wind gusts and half dollar size hail (1.25 inches). Radar indicated.
Timeline
The warning is effective immediately from 2:57 PM CDT and expires at 4:00 PM CDT on August 21, 2026.
Original source: NOAA Official Notice ↗
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