Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 271, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 14, 2026, 11:11 PM CDT for Lee County, Iowa; Hancock County, Illinois. It was in force for 64 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 14, 2026, 11:11 PM CDT (04:11 UTC)
- Expired
- Aug 15, 2026, 12:15 AM CDT
- In force
- 64 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lee County, IA, Hancock County, IL
The radar
The Quad Cities radar (KDVN), 136 km from the middle of the area, began a volume at 04:11 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 nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 4.2 hours before the alert went out and 140 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
- 130 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 627 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
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 14, 6:52 PM CDT, 4 hours 19 minutes earlier.
Area forecast discussion, Aug 14, 6:52 PM CDT, 4 hours 19 minutes before
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</html>Hazardous weather outlook, Aug 14, 2:49 PM CDT, 8 hours 22 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 249 PM CDT Fri Aug 14 2026 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-152000- 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- 249 PM CDT Fri Aug 14 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...THIS AFTERNOON AND TONIGHT Rounds of heavy rain producing storms are expected again tonight. There is a chance for severe storms, especially this evening. All hazards will be possible, but the primary concern will be damaging winds and embedded brief tornadoes in southeast Iowa. Very heavy rainfall and flash flooding will also be a primary concern, especially where storms move repeatedly affect the same area. Significant flash flooding is possible tonight, in urban areas and in counties that saw excessive amounts of rain last night. Several area rivers will be on the rise and have the potential to reach bankfull or even flood stage over the weekend and into early next week. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY More episodes of thunderstorms are expected over the weekend, mainly at night and into the mornings, though there is uncertainty on area and coverage with each successive round. Flash flooding will continue to be a concern, especially Saturday night into Sunday morning if storms move across areas already soaked from Friday's storms. Isolated to scattered damaging wind threats will continue through Saturday night, depending on how organized storms become. Between the episodes of storms, high heat and humidity may produce dangerous Heat Index readings over 100 degrees Saturday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation is likely through tonight. Reports of flooding would also be appreciated. ERVIN
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:58 AM CDT | Flash Flood Warning | DVN | Lee | 6 hr |
| Aug 15, 3:19 AM CDT | Flash Flood Warning | DVN | Des Moines, Henry, Jefferson, Lee, Van Buren | 5 hr |
| Aug 15, 8:33 AM CDT | Areal Flood Warning | DVN | Lee | 6 hr |
| Aug 15, 9:15 AM CDT | River Flood Warning | DVN | Des Moines, Henry, Lee | 57 hr |
| Aug 15, 5:31 PM CDT | Special Weather Statement | DVN | Lee | 29 min |
| Aug 15, 5:41 PM CDT | Severe Thunderstorm Warning | DVN | Lee, Van Buren | 34 min |
| Aug 15, 12:02 AM CDT | Severe Thunderstorm Warning | DVN | Hancock | 58 min |
| Aug 15, 12:31 AM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 74 min |
| Aug 15, 1:55 AM CDT | Flash Flood Warning | DVN | Henderson, McDonough, Warren | 6 hr |
| Aug 15, 7:14 AM CDT | River Flood Warning | DVN | Hancock, McDonough | 4 days |
Nearby
Severe Thunderstorm Warnings in Iowa, 2026Severe Thunderstorm Warnings in Illinois, 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.