Tornadoes and Flash Flooding in Illinois, June 11, 2026

Name: Tornadoes and Flash Flooding in Illinois, June 11, 2026
Start: 2026-06-11T14:54
End: 2026-06-11T18:20
Location: Illinois

June 11, 2026 · NWS DVN · 10 events in 4 counties and zones

Following the storm filled day on June 10th, additional storms developed June 11th, in the morning and again during the afternoon and evening hours with heavy rain and sporadic severe wind. Four brief tornadoes also were reported that did not cause any known damage and were each rated as an EF-U.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 10

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS DVN wrote it up.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Jun 11, 1:32 PM CST, 1 hour 22 minutes earlier. Its key messages:

The threat for fast-moving, severe storms this continues this afternoon. A tornado watch is in effect across much of the area until 9PM.
Heavy rain and flooding is also a threat for those areas that saw the heaviest rain earlier today. A Flood Watch is in effect until 7PM.
Cooler and drier weather will settle in Friday, but a chance for storms returns Saturday. A few storms could be strong to severe.

Area forecast discussion, Jun 11, 1:32 PM CST, 1 hour 22 minutes before

Area Forecast Discussion
National Weather Service Quad Cities IA IL
232 PM CDT Thu Jun 11 2026

.KEY MESSAGES...

- The threat for fast-moving, severe storms this continues this
  afternoon. A tornado watch is in effect across much of the
  area until 9PM.

- Heavy rain and flooding is also a threat for those areas that
  saw the heaviest rain earlier today. A Flood Watch is in
  effect until 7PM.

- Cooler and drier weather will settle in Friday, but a chance
  for storms returns Saturday. A few storms could be strong to
  severe.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 139 PM CDT Thu Jun 11 2026

Severe thunderstorm likelihood continues for this afternoon but
some muddiness exists in the forecast details. The imprint on the
atmosphere from the morning MCS is markedly present with stable
low-level air signatures on radar and satellite, and this extends
across much of our area. Offsetting this to some degree is the
1000 mb low pressure near Des Moines tracking northeast, resulting
in some synoptic scale air mass recovery from the south. While
southeast winds are gusting across eastern Iowa now, the amount of
recovery in that is still limited due to lingering widespread
cloud cover. The post MCS air mass is looking more likely to be
enough to prevent a full recovery to northwest portions of the
CWA, at least of a notable tornado threat and significant severe
wind threat. It may even prevent it for many locations north of
I-80 as well, but synoptically there is still strong forcing for
ascent spreading over the area so not able to say that for
certain.

In summary, the area we are particularly concerned for surface-
based supercell/multicells capable of longer-lived mesocyclones
is along and east of the Mississippi River and along and south of
I-80 during the mid to late afternoon. Given more oblique shear
orientation with respect to the incoming cold front, and just how
cold frontal convection tends to evolve, it might not take long
(1-3 hours after initiation) for developing storms across the CWA
to become more clusters or segments, with a good bet of severe
winds in any that do, some significant in any mature bowing
segments (75+ mph).

Storms should be east of the area this evening as a cold front
moves through. This cold front will bring northwest winds in
its wake. Forecast soundings have trended down a bit, but could
still see gusts in excess of 35 mph for a couple of hours after
the front passes through. These winds will taper off overnight
and become more westerly, and temperatures will fall into the
mid 50s.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 139 PM CDT Thu Jun 11 2026

Friday through Saturday...On Friday, a brief area of high
pressure will build in, leading to mostly sunny skies. This will
exit eastward Friday night, and southerly return flow will
develop. By Saturday afternoon forecast soundings show 1000 to
2000 J/kg, with ample deep layer speed shear. A weak boundary
will be the focus for scattered thunderstorms, and a few could
produce severe weather. Right now large hail looks like the
primary threat.

Sunday through Thursday...Ensemble guidance shows lower height
anomalies spreading across the central US next week, which
supports cooler temperatures. A few weak disturbances embedded
in northwest flow will bring small chances for showers and
thunderstorms, but overall the first half of next week appears
mostly dry.

&&

.AVIATION /12Z TAFS THROUGH 12Z FRIDAY/...
Issued at 1235 AM CDT Thu Jun 11 2026

Main concern through 00Z this evening is scattered
thunderstorms. A few storms could produce damaging wind and
hail, but given the lower predictability did remove hail from
the TAFs.
A cold front will follow once storms exit the region this
evening, bringing VFR conditions, and a brief period of gusty
northwest winds. These winds will decrease later this evening
and overnight.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...Flood Watch until 7 PM CDT this evening for IAZ040>042-051>054-
     063>068-076>078-087>089-098-099.
IL...Flood Watch until 7 PM CDT this evening for ILZ001-002-007-009-
     015>018-024>026-034-035.
MO...Flood Watch until 7 PM CDT this evening for MOZ009-010.

&&

SHORT TERM...NWS
LONG TERM...NWS
AVIATION...NWS

Hazardous weather outlook, Jun 11, 12:14 PM CST, 2 hours 40 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
114 PM CDT Thu Jun 11 2026

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-121815-
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-
114 PM CDT Thu Jun 11 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

Another round of storms capable of producing severe weather will
develop this afternoon and evening. The main threat area is east
of the Mississippi River.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Thunderstorms are expected Saturday afternoon and evening across
the area, some of which may be severe. The Storm Prediction Center
has a slight, level 2 out of 5, risk for parts of the area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today.

NWS

In the hours before

Special weather statement, Jun 11, 9:18 AM CST, 5 hours 36 minutes before

Special Weather Statement
National Weather Service Quad Cities IA IL
1018 AM CDT Thu Jun 11 2026

IAZ040-041-051-052-111630-
Buchanan-Delaware-Benton-Linn-
Including the cities of Independence, Manchester, Vinton,
and Cedar Rapids
1018 AM CDT Thu Jun 11 2026

...Strong Non-Thunderstorm Winds Through 1130 AM...

Strong northeasterly wind gusts not associated with thunderstorms
have developed across part of the U.S. Highway 20 region in
eastern Iowa. Waterloo Airport gusted to over 60 mph with isolated
wind damage reported. While winds are not expected to be that
strong to the east, gusts over 40 mph are expected for parts of
Benton, Buchanan, Delaware, and northern Linn Counties. These
should persist through 11 to 1130 AM. Expect temporary difficult
driving conditions for high profile vehicles.

Local storm report, Jun 11, 12:28 PM CST, 2 hours 26 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
128 PM CDT Thu Jun 11 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 AM     Rain             1 WNW Bettendorf        41.57N 90.50W
06/11/2026  M2.00 Inch       Scott              IA   Trained Spotter

            24-hour rainfall accumulation.

&&

CMD

Local storm report, Jun 11, 12:33 PM CST, 2 hours 21 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
133 PM CDT Thu Jun 11 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1206 PM     Rain             2 NW North Liberty      41.76N 91.62W
06/11/2026  M0.78 Inch       Johnson            IA   Trained Spotter

            Todays AM rain total.

1139 AM     Rain             2 SW Yarmouth           41.01N 91.35W
06/11/2026  M1.00 Inch       Des Moines         IA   Public

            Rainfall total from 945-1130AM.

0941 AM     Rain             1 N Ely                 41.89N 91.59W
06/11/2026  M1.00 Inch       Linn               IA   Public

            Todays AM rain total.

0818 AM     Rain             Carthage                40.41N 91.13W
06/11/2026  M3.20 Inch       Hancock            IL   Trained Spotter

            Rainfall total from Wednesday and overnight.

0702 AM     Rain             Le Claire               41.60N 90.36W
06/11/2026  M1.05 Inch       Scott              IA   Trained Spotter

            24 hour rainfall.

0644 AM     Rain             3 E Garden Plain        41.81N 90.08W
06/11/2026  M1.20 Inch       Whiteside          IL   Trained Spotter

            Wednesday and overnight rainfall totals.

0630 AM     Rain             2 NE Colusa             40.59N 91.15W
06/11/2026  M1.47 Inch       Hancock            IL   Trained Spotter

            Rainfall total from last nights Severe
            Thunderstorm. Small live tree limbs down and
            heavy rainfall with gusty winds at times.

0132 PM     Rain             2 NNW Oakland Mills     40.97N 91.63W
06/11/2026  M1.20 Inch       Henry              IA   Trained Spotter

            Total from AM storms (830-1130AM).

&&

Special weather statement, Jun 11, 1:07 PM CST, 1 hour 47 minutes before

Special Weather Statement
National Weather Service Quad Cities IA IL
207 PM CDT Thu Jun 11 2026

ILZ017-018-112115-
Bureau-Putnam-
Including the cities of Princeton and Hennepin
207 PM CDT Thu Jun 11 2026

...Strong Non-Thunderstorm Winds Through 4 PM...

Strong easterly wind gusts not associated with thunderstorms have
developed across part of the Interstate 80 corridor in Illinois
and portions of Bureau and Putnam counties. Spotters reported 55
to 65 MPH winds for 5 minutes in Princeton, Illinois just before 2
PM. These should persist through 3 to 4 PM. Expect temporary
difficult driving conditions for high profile vehicles.

Local storm report, Jun 11, 1:59 PM CST, 55 minutes before

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
259 PM CDT Thu Jun 11 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0246 PM     Flash Flood      1 ESE Dubuque           42.50N 90.68W
06/11/2026                   Dubuque            IA   Emergency Mngr

            EM reported roads closed due to flooding.

&&

ALE

The radar

The Quad Cities radar (KDVN), 144 km away, was scanning. The volume nearest the first event began at 20:53 UTC.

Open the radar archive at this moment

Event by event

3 funnel cloud, 3 tornado, 2 flash flood, 1 hail, 1 thunderstorm wind. Local standard time, as filed.

Hail, Hancock

When: June 11, 2:54 PM CST
Where: Hancock County, 1.48 mi NNE of Elvaston
Measured: 1 in hail
Reported by: Emergency Manager
Coordinates: 40.420, -91.240

Funnel Cloud, Hancock

When: June 11, 3:10 PM CST
Where: Hancock County, 1.58 mi E of Carthage
Reported by: Trained Spotter
Coordinates: 40.420, -91.100

Report from the Spotter Network and confirmed via social media. Time estimated by radar.

Tornado, Hancock

When: June 11, 3:15 PM CST to 3:17 PM CST
Where: Hancock County, 4.54 mi ESE of Carthage to 4.73 mi ESE of Carthage
Rating: EFU
Path length: 0.22 mi
Path width: 10 yd
Reported by: Storm Chaser
Coordinates: 40.402, -91.047

Multiple chasers and spotters reported a brief tornado in this approximate location. No damage was found, so the tornado will be rated an EF-U.

Funnel Cloud, Hancock

When: June 11, 3:30 PM CST
Where: Hancock County, 2.14 mi NNW of Plymouth
Reported by: Fire Department/Rescue
Coordinates: 40.310, -90.930

Report of a funnel cloud by a firefighter. The time estimated by radar.

Funnel Cloud, McDonough

When: June 11, 3:47 PM CST
Where: McDonough County, 2.96 mi SSE of Colmar
Reported by: Public
Coordinates: 40.310, -90.880

Multiple calls and photos were received for funnel clouds between Plymouth and Industry.

Thunderstorm Wind, McDonough

When: June 11, 3:48 PM CST
Where: McDonough County, 1.48 mi SSW of Macomb
Measured: 50 kt (58 mph) estimated gust
Reported by: Storm Chaser
Coordinates: 40.450, -90.680

Branches were reported blown down.

Tornado, McDonough

When: June 11, 3:54 PM CST to 3:55 PM CST
Where: McDonough County, 3.38 mi NE of Argyle Lake Sp to 3.45 mi NE of Argyle Lake Sp
Rating: EFU
Path length: 0.08 mi
Path width: 10 yd
Reported by: Storm Chaser
Coordinates: 40.487, -90.738

Chaser video of short lived condensation funnel on the ground. No known damage, thus it was rated as an EFU.

Flash Flood, McDonough

When: June 11, 4:20 PM CST to 6:20 PM CST
Where: McDonough County, 2.32 mi SSW of Macomb to 1.65 mi S of Macomb
Cause: Heavy Rain
Reported by: Trained Spotter
Coordinates: 40.440, -90.690

Significant street flooding occurring by Macomb.

Flash Flood, Stephenson

When: June 11, 4:30 PM CST to 5:30 PM CST
Where: Stephenson County, 2.47 mi NW of Damascus to 2.19 mi NW of Damascus
Cause: Heavy Rain
Reported by: Trained Spotter
Coordinates: 42.390, -89.740

Rural road is partially washed out by flood waters. Reported to be already receding.

Tornado, Bureau

When: June 11, 5:12 PM CST to 5:14 PM CST
Where: Bureau County, 2.14 mi SSE of Normandy to 1.24 mi WNW of Walnut
Rating: EFU
Path length: 1.39 mi
Path width: 10 yd
Reported by: Emergency Manager
Coordinates: 41.540, -89.640

EFU tornado based on video and photos were relayed to NWS through Emergency Management and broadcast media. No damage reported by EMA and local fire department.

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Funnel Cloud: A rotating column of cloud extending from a thunderstorm that did not reach the ground.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2026 Every state in 2026 This day in weather history The tornado archive for Illinois, 2026 Warnings in Illinois, June 2026

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1337526, 1337522, 1337528, 1337525, 1337519, 1337527, 1337529, 1337503, 1337511, 1337530.