Alert archive / Iowa / Tornado Warnings in 2026

Tornado Warning 85, NWS Quad Cities, IA

August 11, 2026Clinton County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 11, 2026, 8:29 AM CDT for Clinton County, Iowa. It was in force for 20 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 11, 2026, 8:29 AM CDT (13:29 UTC)
Expired: Aug 11, 2026, 8:49 AM CDT
In force: 20 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Clinton County, IA

The radar

The Quad Cities radar (KDVN), 24 km from the middle of the area, began a volume at 13:30 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.

What was reported inside it

Time	Report	Where	Remark
Aug 11, 8:29 AM CDT	TORNADO	Dewitt, IA	An EF0 tornado, with max wind speeds of 85 MPH, caused damage to trees and houses along its half-mile path. The tornado first caused some minor shingle damage to a home before crossing 14th Avenue. Then, damage to a few more houses was seen, including portions
Aug 11, 8:30 AM CDT	TSTM WND DMG	Dewitt, IA	Portion of roofing peeled off a house. Time estimated from radar.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 11, 7:22 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 1.5 hours before the alert went out and 19 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 4268 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 9.5

Open this sounding in Storm Lab

The text

As transmitted.

940 
WFUS53 KDVN 111329
TORDVN
IAC045-111400-
/O.NEW.KDVN.TO.W.0085.260811T1329Z-260811T1400Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
829 AM CDT Tue Aug 11 2026

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southeastern Clinton County in east central Iowa...

* Until 900 AM CDT.

* At 829 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Malone, or 12 miles west of Clinton, moving
  southeast at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Clinton, Camanche, Low Moor, Elvira, Rock Creek  Park, Folletts, 
  Clinton Municipal Airport, Rock Creek Marina and Campground, and 
  Malone around 835 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4180 9020 4177 9028 4173 9032 4174 9034
      4173 9036 4174 9039 4173 9039 4173 9041
      4174 9041 4176 9044 4176 9046 4177 9047
      4177 9053 4185 9060 4195 9047
TIME...MOT...LOC 1329Z 313DEG 36KT 4186 9048 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

3 follow-up statements

117 
WWUS53 KDVN 111337
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
837 AM CDT Tue Aug 11 2026

IAC045-111400-
/O.CON.KDVN.TO.W.0085.000000T0000Z-260811T1400Z/
Clinton IA-
837 AM CDT Tue Aug 11 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 AM CDT FOR
SOUTHEASTERN CLINTON COUNTY...

At 837 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Low Moor, or 8 miles southwest of Clinton, moving
southeast at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This dangerous storm will be near...
  Clinton, Camanche, Low Moor, Rock Creek  Park, Folletts, and Rock 
  Creek Marina and Campground around 840 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4180 9020 4177 9028 4173 9032 4174 9034
      4173 9036 4174 9039 4173 9039 4173 9041
      4174 9041 4176 9044 4176 9046 4177 9047
      4177 9053 4181 9053 4189 9041
TIME...MOT...LOC 1337Z 317DEG 40KT 4179 9040 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

941 
WWUS53 KDVN 111344
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
844 AM CDT Tue Aug 11 2026

IAC045-111400-
/O.CON.KDVN.TO.W.0085.000000T0000Z-260811T1400Z/
Clinton IA-
844 AM CDT Tue Aug 11 2026

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 AM CDT FOR
SOUTHEASTERN CLINTON COUNTY...

At 844 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Rock Creek Marina and Campground, or 8 miles
southwest of Clinton, moving southeast at 40 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
southeastern Clinton County, including the following locations...
Rock Creek Marina and Campground, Folletts, Rock Creek  Park, and
Clinton Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4180 9020 4177 9028 4173 9032 4174 9034
      4173 9036 4174 9039 4173 9039 4173 9041
      4174 9041 4176 9044 4176 9046 4185 9032
TIME...MOT...LOC 1344Z 313DEG 36KT 4174 9032 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

830 
WWUS53 KDVN 111349 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
849 AM CDT Tue Aug 11 2026

IAC045-111359-
/O.CAN.KDVN.TO.W.0085.000000T0000Z-260811T1400Z/
Clinton IA-
849 AM CDT Tue Aug 11 2026

...THE TORNADO WARNING FOR SOUTHEASTERN CLINTON COUNTY IS
CANCELLED...

The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 PM CDT for
northwestern Illinois...and east central Iowa.

&&

LAT...LON 4180 9020 4177 9028 4173 9032 4174 9034
      4173 9036 4174 9039 4173 9039 4173 9041
      4174 9041 4176 9044 4176 9046 4185 9032
TIME...MOT...LOC 1347Z 313DEG 36KT 4170 9026 

$$

Gibbs

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 9:02 PM CDT	Tornado Warning	DVN	Delaware	43 min
Aug 11, 5:08 AM CDT	Special Weather Statement	DVN	Benton	37 min
Aug 11, 6:53 AM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	52 min
Aug 11, 7:09 AM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Jones, Linn	81 min
Aug 11, 7:11 AM CDT	Severe Thunderstorm Warning Destructive damage threat	DVN	Buchanan, Delaware, Jones, Linn	49 min
Aug 11, 7:15 AM CDT	Tornado Warning	DVN	Buchanan, Delaware	45 min
Aug 11, 7:33 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Dubuque, Jackson	57 min
Aug 11, 7:36 AM CDT	Tornado Warning	DVN	Delaware, Dubuque	39 min
Aug 11, 7:59 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Clinton, Jackson, Jones	61 min
Aug 11, 8:01 AM CDT	Tornado Warning	DVN	Clinton, Jackson	44 min
Aug 11, 8:20 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	Clinton, Scott	43 min
Aug 11, 8:38 AM CDT	Tornado Warning	DVN	Scott	23 min
Aug 11, 8:54 AM CDT	Severe Thunderstorm Warning	DVN	Scott	81 min

Nearby

Tornado Warnings in Iowa, 2026 Every tornado warning in 2026 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.