Severe Thunderstorm Warning Issued for Carroll, Whiteside Counties IL and Clinton, Jackson Counties IA
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The National Weather Service has issued a Severe Thunderstorm Warning for portions of northwestern Illinois and east central Iowa until 8:00 PM CDT on August 21, 2026.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Northwestern Illinois and East Central Iowa
- Issued
- August 21, 2026
- Issuing authority
- NWS Quad Cities IA 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
A Severe Thunderstorm Warning has been issued by the National Weather Service Quad Cities IA IL. The alert is effective from August 21, 2026 at 6:54 PM CDT until August 21, 2026 at 8:00 PM CDT.
Affected Areas
The warning covers Carroll County and Whiteside County in northwestern Illinois, as well as Clinton County and Jackson County in east central Iowa. Locations impacted include Clinton, Morrison, Fulton, Savanna, Garden Plain, Preston, Fairhaven, Albany, Sabula, Miles, Andover, East Clinton, Argo Fay, Union Grove, Ustick, Thomson, Wacker, Ideal, Teeds Grove, Malvern, and Morrison-Rockwood State Park.
What You Should Do
For protection, move to an interior room on the lowest floor of a sturdy building. Torrential rainfall is occurring with these storms and may lead to flash flooding. Do not drive your vehicle through flooded roadways.
Expected Conditions
At 6:53 PM CDT, severe thunderstorms were located along a line extending from near Savanna to Preston, moving southeast at 30 mph. Hazards include 60 mph wind gusts and quarter size hail (1.00 inch). Hail damage to vehicles is expected, along with wind damage to roofs, siding, and trees.
Timeline
The warning is in effect from 6:54 PM CDT on August 21, 2026, and expires at 8:00 PM CDT on August 21, 2026.
Original source: NOAA Official Notice ↗
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