Severe Thunderstorm Warning 182, NWS Quad Cities, IA

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
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

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.

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

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
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.

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