Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 277, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 21, 2026, 4:26 PM CDT for Dubuque County, Iowa. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2026, 4:26 PM CDT (21:26 UTC)
- Expired
- Aug 21, 2026, 4:55 PM CDT
- In force
- 29 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Dubuque County, IA
The radar
The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 21:26 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 21, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.4 hours before the alert went out and 321 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1302 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 1:58 PM CDT, 2 hours 28 minutes earlier.
Area forecast discussion, Aug 21, 1:58 PM CDT, 2 hours 28 minutes before
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</html>Hazardous weather outlook, Aug 21, 3:10 AM CDT, 13 hours 16 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 310 AM CDT Fri Aug 21 2026 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-220815- Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson- Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren-Hancock-McDonough-Scotland-Clark- 310 AM CDT Fri Aug 21 2026 This Hazardous Weather Outlook is for portions of north central Illinois...northwest Illinois...west central Illinois...east central Iowa...northeast Iowa...southeast Iowa and northeast Missouri. .DAY ONE...TODAY AND TONIGHT There will be the chance for strong to severe storms today, especially for areas along and east of the Mississippi River. Storms are expected to develop through the afternoon hours with damaging winds and hail being the primary threats, with isolated tornadoes being secondary. The Storm Prediction Center has highlighted areas along and east of the river in a Slight Risk, or level 2 of 5, for severe weather. A Marginal Risk, level 1 of 5, remains for areas west. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Storm spotter activation is expected today, especially in Illinois this afternoon and evening. ERVIN
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 5:24 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 40 min |
| Aug 21, 6:20 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson, Jones | 21 min |
| Aug 21, 6:51 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jones, Scott | 21 min |
| Aug 21, 6:54 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 66 min |
| Aug 21, 3:52 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 38 min |
| Aug 21, 5:28 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 47 min |
| Aug 21, 6:15 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson | 60 min |
| Aug 21, 6:56 PM CDT | Tornado Warning | DVN | Bureau, Putnam | 49 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.