Flash Flood Warning 9, NWS Des Moines, IA

495 
WGUS73 KDMX 111446
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
946 AM CDT Thu Jun 11 2026

IAC001-003-121-175-111815-
/O.CON.KDMX.FF.W.0009.000000T0000Z-260611T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Adair IA-Adams IA-Madison IA-Union IA-
946 AM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS 
AFTERNOON FOR SOUTHWESTERN MADISON, UNION, SOUTHEASTERN ADAIR AND 
EASTERN ADAMS COUNTIES...

At 946 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. The public reported flash flooding in the Creston area 
around 8 am.

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...
  Creston, Corning, Lenox, Green Valley Lake, Lake Icaria, Afton, 
  Orient, Lorimor, Prescott, Macksburg, Cromwell, Arispe, Shannon 
  City, Kent, Green Valley Lake State Park, Creston Municipal 
  Airport and Lake Icaria State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For the latest stream observations and forecasts refer to 
weather.gov/desmoines/water.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4134 9429 4125 9396 4116 9402 4090 9419
      4090 9421 4090 9424 4090 9427 4090 9446
      4090 9447 4090 9459 4104 9482 4116 9461

FLASH FLOOD...RADAR INDICATED

$$

Zogg

205 
WGUS73 KDMX 111502
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
1002 AM CDT Thu Jun 11 2026

IAC001-003-121-175-111512-
/O.CAN.KDMX.FF.W.0009.000000T0000Z-260611T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Adair IA-Adams IA-Madison IA-Union IA-
1002 AM CDT Thu Jun 11 2026

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN MADISON, UNION, 
SOUTHEASTERN ADAIR AND EASTERN ADAMS COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 1100 AM CDT for portions of 
central, south central, and southeast Iowa.

A Flood Watch remains in effect until 1100 AM CDT for portions of 
central, south central, southwest, and west central Iowa.

&&

LAT...LON 4134 9429 4125 9396 4116 9402 4090 9419
      4090 9421 4090 9424 4090 9427 4090 9446
      4090 9447 4090 9459 4104 9482 4116 9461

$$

Zogg

Area Forecast Discussion
National Weather Service Des Moines IA
615 AM CDT Thu Jun 11 2026

 ...Updated for the 12z Aviation Discussion...

.KEY MESSAGES...

- Severe storms are expected this morning and are possible again
  from midday into the early evening. All severe hazards are
  possible including damaging winds (potentially up to 80 mph
  early this morning), large hail, and tornadoes, as well as
  heavy rain bringing a threat for Flash Flooding.

- Gusty winds behind the storms may have 30-40 mph gusts, with
  50 mph gusts not out of the question from late morning into
  late afternoon west to east respectively.

- Cooler, drier conditions develop on Friday.

- Thunderstorm chances return Saturday, some of which may be
  severe.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 315 AM CDT Thu Jun 11 2026

Upper level trough crosses through the Central Plains this morning
before swinging through the Upper Midwest this afternoon into
tonight and then arriving in the Great Lakes region late tonight. At
the surface, a low over western Kansas early overnight is expected
to move towards and then into Iowa this morning as it heads for the
southern Great Lakes area into tonight. Additionally, the boundary
is stalled out around central Iowa that will later on today continue
to progress eastward as a cold front while the warm front/modifying
outflow has begun to activate in central Nebraska early this morning
and will continue to lift back northward. With ample forcing as
noted already aided further by a 40-50+ knot LLJ we're looking at
another round of severe storms this morning with some chance for
additional development along the eventually progressing cold
front/any lingering boundary from this morning's activity from
around midday through this afternoon.

We've already coordinated a Severe Thunderstorm watch with SPC and
surrounding offices for this first round early this morning
with the risk of large hail, some very large hail possible
early, with all guidance and expectation in the clusters of
storms growing upscale into a severe MCS as they progress
eastward across Iowa bringing the threat for damaging wind gusts
up to 70 mph, potentially even destructive and up to 80 mph.
Although early storms are generally expected to be elevated, a
tornado could be possible early with supercell structures but
certainly with time storms are expected to become surface based
as moisture surges back in this morning sending instability
values by mid morning back to 2000-4000 J/kg and with nearing 50
knots or more of 0-6 bulk shear. Thus, tornadoes along the line
near and then after sunrise are possible as the storms cross
through southern into portions of central Iowa. The bulk of this
first round should be through by 15 or 16Z (10 or 11A) and is
the highest severe risk of the day.

Additional storms may be able to reactivate along the cold front as
previously mentioned or any lingering outflow depending on our
atmosphere recovery. This looks most likely in the far
east/southeast but could also occur in portions of central to north
central Iowa if this first round is able to push through quickly
(south central), or with locations that stay dry in the first round
(portions of central into north central Iowa) or further east
altogether if morning storms hold on longer. All hazards are on the
table again - damaging wind gusts, large hail, and tornadoes, with
the tornado threat highest near the triple point into east
central/northeast Iowa, but should not be discounted elsewhere given
the environment. Showers have already started in northwest Iowa and
showers, occasional storms, are expected to prevail a good portion
of the day over northwest into northern Iowa where the severe risk
is much lower (severe weather not expected in northwest Iowa).

Behind these 2 rounds of storms, environmental winds on the back
side of the low look to increase with gusts of 30-40 mph common, and
50 mph gusts not out of the question. Considered a wind headline but
confidence in location and timing is not quite there to do so but
this will be something we will watch closely into midday with these
winds expected to move in west to east from mid morning west.
through late afternoon to early evening in the east

The Flood Watch also remains in effect this morning, see the hydro
discussion for further details on the hydro threat with these storms
today.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
Issued at 301 PM CDT Wed Jun 10 2026

Behind the cold front on Thursday, conditions become cooler and
drier through Friday. Thunderstorm chances then return again on
Saturday, with severe storms possible once again Saturday afternoon.
With so much ongoing in the short-term, will discuss this risk more
thoroughly once we are through the current active period.

&&

.AVIATION /06Z TAFS THROUGH 06Z FRIDAY/...
Issued at 559 AM CDT Thu Jun 11 2026

A complex of thunderstorms in southwest IA will continue to race
east this morning, likely growing upscale with time. DSM and
OTM are the most likely to take the brunt of this system within
the next couple of hours. Strong westerly winds will coincide
with the storms' arrival with gusts reaching 35-45 knots. These
gusts may be too conservative of an estimate but we'll see how
observations and radar trends evolve. IFR conditions are
expected during storms with showers and MVFR cigs likely
continuing afterwards for much of the region into this
afternoon. CAMs suggest a another round of storms is possible
this afternoon at OTM so have kept PROB30 while slightly
adjusting timing. VFR conditions expected this evening onward
as skies clear. Southeasterly winds flip to northwesterly after
a cold frontal passage in the wake of the precip with speeds
increasing to 15-20 knots this afternoon. Gusts will reach 30-35
knots. Winds turn westerly and slow to 5-10 knots this evening.

&&

.HYDROLOGY...
Issued at 1134 AM CDT Wed Jun 10 2026

Flash flood concerns exist through Thursday morning due to rainfall
earlier today as well as additional rain later today into tonight.
See the latest WPC Day1/Day2 Excessive Rainfall Outlooks (EROs) and
Mesoscale Precipitation Discussions (MPDs), as well as NWC Flood
Hazard Outlooks (FHOs) and Area Hydrologic Discussions (AHDs) for
more details. We issued a flash flood watch up to I-80 to
highlight the threat through Thursday morning.

Greatest concern is potential flash flooding tonight in central and
southern Iowa. Training storms may produce up to 3-4+ inches of rain
in those areas. Flash flood threat in central Iowa would mainly
involve urban areas including the Des Moines metro area. Higher end
rainfall may lead to flooding of creeks and small streams. In
southern Iowa, flash flood concerns involve more than urban areas,
such as roads going through lower areas or near streams. Higher end
rainfall there may lead to more significant flash flooding.

With much of the potential flash flooding occurring during the
night, floodwaters can be more difficult to see especially in areas
that lack urban lighting. We would like to remind people to avoid
driving into flooded areas, instead find an alternate route. Also
people living in areas prone to flash flood impacts should plan in
advance what to do if floodwaters threaten their areas tonight.

Longer term, the risk of river flooding over the next several days
is minimal (generally less than 15-25%), however minor to moderate
within-bank rises are again possible in basins that receive heavier
rainfall.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 11 AM CDT this morning for IAZ057>062-
070>075-081>086-092>097.

&&

SHORT TERM...05
LONG TERM...Dodson
AVIATION...
HYDROLOGY...Zogg

Hazardous Weather Outlook
National Weather Service Des Moines IA
343 AM CDT Thu Jun 11 2026

IAZ004>007-015>017-023>028-033>039-044>050-120845-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-
343 AM CDT Thu Jun 11 2026

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Severe storms are possible this morning in central Iowa and again
from midday into the early evening in portions of central to
eastern Iowa. All severe hazards are possible including damaging
winds, large hail, and tornadoes, as well as heavy rain bringing
a threat for flash flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Thunderstorm chances return Saturday, some of which may be severe
in especially southern Iowa.

.SPOTTER INFORMATION STATEMENT...

Spotters will be needed today. Rainfall reports are also
appreciated.

IAZ057>062-070>075-081>086-092>097-120845-
Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison-
Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-
Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis-
343 AM CDT Thu Jun 11 2026

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Severe storms are expected this morning and are possible again from
midday into the early evening. All severe hazards are possible
including damaging winds (potentially up to 80 mph early this
morning), large hail, and tornadoes, as well as heavy rain
bringing a threat for flash flooding.

A Flood Watch is in effect for the area this morning. Please
refer to the National Weather Service website at
weather.gov/desmoines for further details.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Thunderstorm chances return Saturday, some of which may be severe
in especially southern Iowa.

.SPOTTER INFORMATION STATEMENT...

Spotters will be needed today. Rainfall reports are also
appreciated.

Preliminary Local Storm Report
National Weather Service Des Moines IA
646 AM CDT Thu Jun 11 2026

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

0618 AM     Tstm Wnd Gst     Griswold                41.23N 95.14W
06/11/2026  M65 MPH          Cass               IA   Mesonet

            Measured from personal weather station.

&&

Preliminary Local Storm Report
National Weather Service Des Moines IA
651 AM CDT Thu Jun 11 2026

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

0645 AM     Hail             Creston                 41.06N 94.36W
06/11/2026  M1.00 Inch       Union              IA   Trained Spotter

&&

Preliminary Local Storm Report
National Weather Service Des Moines IA
656 AM CDT Thu Jun 11 2026

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

0638 AM     Tstm Wnd Gst     1 NNW Audubon           41.73N 94.94W
06/11/2026  M68 MPH          Audubon            IA   Mesonet

            Measured from personal weather station.

0647 AM     Tstm Wnd Gst     6 NE Audubon            41.78N 94.84W
06/11/2026  M64 MPH          Audubon            IA   Mesonet

            Measured from personal weather station.

0653 AM     Tstm Wnd Gst     1 SW Adair              41.49N 94.66W
06/11/2026  M70 MPH          Adair              IA   Mesonet

            Measured from personal weather station.

0655 AM     Tstm Wnd Gst     Creston                 41.06N 94.36W
06/11/2026  M70 MPH          Union              IA   Emergency Mngr

            Relayed via NWS Chat.

0655 AM     Hail             Afton                   41.03N 94.20W
06/11/2026  M1.00 Inch       Union              IA   Emergency Mngr

&&