Alert archive / Illinois / Flash Flood Warnings in 2026
Flash Flood Warning 20, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Jun 11, 2026, 4:57 PM CDT for Jo Daviess County, Stephenson County, Illinois. It was in force for 3 hr. 4 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
- Jun 11, 2026, 4:57 PM CDT (21:57 UTC)
- Expired
- Jun 11, 2026, 8:11 PM CDT
- In force
- 3 hr
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Jo Daviess County, IL, Stephenson County, IL
The radar
The Quad Cities radar (KDVN), 104 km from the middle of the area, began a volume at 22:01 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 |
|---|---|---|---|
| Jun 11, 4:58 PM CDT | RAIN 1.96 | 3 N Stockton, IL | Todays rainfall, with 1.03in falling from 330-400pm. |
| Jun 11, 5:16 PM CDT | RAIN 1.8 | 2 W Bolton, IL | Current day total, another wave set to come through later. |
| Jun 11, 5:30 PM CDT | FLASH FLOOD | 2 Nw Damascus, IL | Rural road partially washed out by flood waters. Reported to be already receding. |
| Jun 11, 6:30 PM CDT | RAIN 2.03 | 3 N Stockton, IL | Includes 1.03 inches in 30 minutes. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 33 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 99 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
- 11 J/kg
- Mixed-layer CIN
- -285 J/kg
- Mixed-layer LCL
- 1008 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- -15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
642
WGUS53 KDVN 112157
FFWDVN
ILC085-177-120400-
/O.NEW.KDVN.FF.W.0020.260611T2157Z-260612T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
457 PM CDT Thu Jun 11 2026
The National Weather Service in Quad Cities has issued a
* Flash Flood Warning for...
Jo Daviess County in northwestern Illinois...
Stephenson County in northwestern Illinois...
* Until 1100 PM CDT Thursday.
* At 457 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Freeport, Lena, Stockton, Warren, Hanover, Pearl City, Elizabeth,
Cedarville, Davis, Woodbine, Dakota, German Valley, Scales Mound,
Apple River, Winslow, Rock City, Ridott, Nora, Massbach and
Schapville.
This includes the following State Parks...
Apple River Canyon State Park and Lake Le-Aqua-Na State Recreation
Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4220 8940 4219 9031 4251 9033 4250 8940
FLASH FLOOD...RADAR INDICATED
$$
122 follow-up statements
022
WGUS73 KDVN 112325
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
625 PM CDT Thu Jun 11 2026
ILC085-177-120400-
/O.CON.KDVN.FF.W.0020.000000T0000Z-260612T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jo Daviess IL-Stephenson IL-
625 PM CDT Thu Jun 11 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 11 PM CDT THIS
EVENING FOR JO DAVIESS AND STEPHENSON COUNTIES...
At 625 PM CDT, Heavy rainfall and run-off from earlier rounds of
strong thunderstorms may still be producing some lingering flooding
across the warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Freeport, Lena, Stockton, Warren, Hanover, Pearl City, Elizabeth,
Cedarville, Davis, Woodbine, Dakota, German Valley, Scales Mound,
Apple River, Winslow, Rock City, Ridott, Nora, Massbach and
Schapville.
This includes the following State Parks...
Apple River Canyon State Park and Lake Le-Aqua-Na State Recreation
Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4220 8940 4219 9031 4251 9033 4250 8940
FLASH FLOOD...RADAR INDICATED
$$
12819 WGUS73 KDVN 120111 FFSDVN Flash Flood Statement National Weather Service Quad Cities IA IL 811 PM CDT Thu Jun 11 2026 ILC085-177-120121- /O.CAN.KDVN.FF.W.0020.000000T0000Z-260612T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jo Daviess IL-Stephenson IL- 811 PM CDT Thu Jun 11 2026 ...FLASH FLOOD WARNING IS CANCELLED FOR JO DAVIESS AND STEPHENSON COUNTIES... The heavy rain has ended and flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. && LAT...LON 4220 8940 4219 9031 4251 9033 4250 8940 $$ Uttech
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Jun 11, 2:32 PM CDT, 2 hours 25 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, 2:32 PM CDT, 2 hours 25 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...NWSHazardous weather outlook, Jun 11, 1:14 PM CDT, 3 hours 43 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
Local storm report, Jun 11, 1:28 PM CDT, 3 hours 29 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.
&&
CMDLocal storm report, Jun 11, 1:33 PM CDT, 3 hours 24 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, 2:07 PM CDT, 2 hours 50 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, 2:59 PM CDT, 1 hour 58 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.
&&
ALELocal storm report, Jun 11, 4:24 PM CDT, 33 minutes before
Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
424 PM CDT Thu Jun 11 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM Flash Flood Dubuque 42.50N 90.69W
06/11/2026 Dubuque IA Public
Report of flooded basements and running
water over some neighborhood streets.
&&The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 7:02 PM CDT | Tornado Warning | DVN | Bureau | 43 min |
| Jun 10, 7:17 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson, McDonough, Warren | 58 min |
| Jun 10, 7:20 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Putnam | 55 min |
| Jun 10, 7:30 PM CDT | Severe Thunderstorm Warning | DVN | Hancock | 75 min |
| Jun 10, 8:19 PM CDT | Flash Flood Warning | DVN | Hancock | 5 hr |
| Jun 10, 8:49 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough, Warren | 56 min |
| Jun 10, 9:26 PM CDT | Severe Thunderstorm Warning | DVN | Hancock | 34 min |
| Jun 10, 9:44 PM CDT | River Flood Warning | DVN | Henry, Rock Island, Whiteside | 5 days |
| Jun 10, 9:44 PM CDT | River Flood Warning | DVN | Henry, Rock Island | 6 days |
| Jun 10, 10:13 PM CDT | River Flood Warning | DVN | Hancock, McDonough | 3 days |
| Jun 11, 9:18 AM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 52 min |
| Jun 11, 9:20 AM CDT | Severe Thunderstorm Warning | DVN | Henderson, Mercer, Warren | 54 min |
| Jun 11, 9:36 AM CDT | River Flood Watch | DVN | Henry | 11 hr |
| Jun 11, 11:21 AM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson, McDonough, Warren | 54 min |
| Jun 11, 3:09 PM CDT | Tornado Warning | DVN | Hancock | 51 min |
| Jun 11, 3:51 PM CDT | Tornado Warning | DVN | Hancock | 39 min |
| Jun 11, 4:19 PM CDT | Tornado Warning | DVN | Hancock, McDonough | 56 min |
| Jun 11, 5:02 PM CDT | Flash Flood Warning | DVN | Hancock, McDonough | 4 hr |
| Jun 11, 5:09 PM CDT | Tornado Warning | DVN | Putnam | 17 min |
| Jun 11, 5:14 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, McDonough | 45 min |
| Jun 11, 5:19 PM CDT | Tornado Warning | DVN | McDonough | 41 min |
| Jun 11, 5:45 PM CDT | Tornado Warning | DVN | Bureau, Henry | 30 min |
Nearby
Flash Flood Warnings in Illinois, 2026Every flash flood 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.