Flash Flood Warning 5, NWS Des Moines, IA

631 
WGUS73 KDMX 060621
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
121 AM CDT Sat Jun 6 2026

IAC125-061045-
/O.CON.KDMX.FF.W.0005.000000T0000Z-260606T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion IA-
121 AM CDT Sat Jun 6 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT EARLY THIS 
MORNING FOR MARION COUNTY...

At 121 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 5 inches of rain have 
fallen. Additional rainfall amounts up to 0.5 inch are possible in 
the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Pella, Knoxville, Melcher-Dallas, Knoxville Raceway, Lake Red 
  Rock, Harvey, Knoxville Municipal Airport, Elk Rock State Park and 
  Pella Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

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 4149 9316 4148 9287 4143 9287 4133 9287
      4129 9287 4126 9287 4125 9287 4124 9287
      4118 9300 4121 9326 4134 9333 4136 9333
      4136 9313

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Dodson

249 
WGUS73 KDMX 060811
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
311 AM CDT Sat Jun 6 2026

IAC125-060821-
/O.CAN.KDMX.FF.W.0005.000000T0000Z-260606T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion IA-
311 AM CDT Sat Jun 6 2026

...FLASH FLOOD WARNING IS CANCELLED FOR MARION COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 700 AM CDT for portions of 
south central, southeast, and southwest Iowa.

&&

LAT...LON 4149 9316 4148 9287 4143 9287 4133 9287
      4129 9287 4126 9287 4125 9287 4124 9287
      4118 9300 4121 9326 4134 9333 4136 9333
      4136 9313

$$

Dodson

Area Forecast Discussion
National Weather Service Des Moines IA
635 PM CDT Fri Jun 5 2026

 ...Updated for the 00z Aviation Discussion...

.KEY MESSAGES...

- A lull in the storm activity for much of today, but storms return
  this evening and tonight, mainly across southern and central
  Iowa. There are renewed concerns for flash flooding and severe
  storms with all hazards possible.

- Much of Saturday will be dry but muggy, with scattered late
  day and evening storms again possible across central and southern
  Iowa.

- Heavy rain is a concern for renewed showers and thunderstorms
  on Sunday into Monday. Then heat builds next week with many
  areas exceeding 90 degrees.

&&

.SHORT TERM /THROUGH SATURDAY/...
Issued at 1214 PM CDT Fri Jun 5 2026

Upper air pattern early this afternoon features a low amplitude
upper trough moving through the northern Plains and upper
Midwest. Still seeing rather thick cloud cover across much of
Iowa due to abundant low level moisture (enhanced by yesterday’s
rainfall) trapped under the developing inversion. The storms
from overnight pushed the effective sfc boundary into Missouri
this morning, but the latest sfc obs show winds shifting back
southerly across portions of southern and central Iowa. Some
breaks in the cloud cover have allowed temps to climb into the
70s, and expect some additional heating the remainder of the
afternoon.

With the expected high temperatures (upper 70s to lower 80s)
model soundings continue to show at least a weak cap /MLCIN of
-25 J/kg/ remaining over much of the CWA through early evening.
With generally weak background forcing/ascent, any CI will
likely be tied to moisture convergence along the sfc boundary.
Several of the CAMs /HRRR, RRFS/ try to initiate isolated storms
across far southern Iowa from 22-00Z. While very conditional, if
any storms can initiate in that region, strong MLCAPE /2000-3000
J/kg/, steeper mid-level lapse rates, and effective deep layer
shear values of 25-35kts could lead to supercell development.
Large hail and damaging winds would be the primary threat,
although an isolated tornado is possible, especially near any
locally backed flow and enhanced SRH near the boundary.

The more robust severe threat will occur later in the evening
and then continue into the overnight as stronger lift develops
due to the strengthening nocturnal LLJ. Good model consensus
shows storms developing over ern NE/swrn IA from 9-11pm CDT and
then expanding eastward along the sfc boundary. Highest threat
for storms will generally occur along and south of I-80, but
will be ultimately dependent on where the sfc boundary ends up.
Even during these overnight hours, favorable MUCAPE/effective
shear will continue at least an isolated severe weather threat
/mainly hail and wind/ along with an escalating heavy rain
threat, see Hydro Discussion below. Storms will likely persist
until around sunrise Saturday before gradually weakening. See
the SPC Day 1 Slight Risk (Level 2 of 5) and any forthcoming
SWOMCDs for further details.

Saturday and Saturday Night..

Any remaining storms will be diminishing on early Saturday
morning. Shortwave upper ridging is then expected to develop by
Sat afternoon, with broad subsidence and little in the way of
forcing noted. As such, still expecting much of Saturday to be
dry, warm, and muggy, with highs again in the 80s. The
deterministic models and CAMs do indicate the possibility for
isolated/scattered late afternoon or evening storms, potentially
along any sfc or residual outflow boundaries. The most likely
location of storms is again across central and southern Iowa,
where the strong instability will reside, MLCAPE of 2000-3000
J/kg. Wind shear in that same area remains generally weak /less
than 20 kts/ so mainly pulse or perhaps multicell storms being
the most likely mode, with marginally severe hail or wet
microbursts possible. A SPC Day 2 Marginal Risk (Level 1 of 5)
appears reasonable for now. Any storms will be diurnally driven,
with activity waning after sunset.

&&

.LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/...
Issued at 1214 PM CDT Fri Jun 5 2026

An upper level cutoff low across the southern plains on Sunday
morning will lift into the midwest by the afternoon and evening.
Deep moisture transport out of the gulf increases into Iowa,
especially southern Iowa. Scattered daytime showers and
thunderstorms may linger with renewed thunderstorms developing
in the evening and continuing overnight into Monday morning as
the upper low/trough tracks across Iowa. The threat for severe
storms appears low at this time with deeply saturated soundings
exhibiting very little instability (500 J/kg) or shear (20 kts
or less). The primary concern this period will be additional
heavy rain across southern Iowa, following heavy rain Thursday
and Friday nights. With PWATs near 2” and deep warm cloud layers
exceeding 4000m, expect efficient rain fall across southern into
central Iowa.

The upcoming week should be mainly dry, though few weak waves
skimming the area could bring renewed showers or thunderstorms
to the area. Heat builds through the week as the thermal ridge
expands and shifts into the midwest. While NBM guidance has
rockets up into the mid to upper 90s by the middle to end of
next week, this seems overdone from over mixing and with weak
waves thwarting the highest temperatures. NBM has been on the
highest end of the guidance envelope the past several cycles and
will continue to need nudging down unless the pattern changes.
Despite the overzealous NBM, temperatures will still be quite
warm and reach the upper 80s to low 90s. The next more organized
chance for precipitation arrives late in the week around
Thursday.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 632 PM CDT Fri Jun 5 2026

Thunderstorms are expected to develop tonight which will impact
terminals in southern to central Iowa (KDSM and KOTM) while
northern terminals will not be impacted, though a stray shower
or two can't be ruled out in the north. With these
thunderstorms, KDSM and KOTM may have intermittent MVFR
conditions as thunderstorms move through. At northern terminals,
however, IFR fog may develop overnight tonight. After sunrise
and any fog dissipates, MVFR to VFR conditions are expected
across Iowa through the day tomorrow.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
None.

&&

SHORT TERM...05
LONG TERM...Fowle
AVIATION...Rotter

Hazardous Weather Outlook
National Weather Service Des Moines IA
Issued by National Weather Service Twin Cities/Chanhassen MN
137 PM CDT Fri Jun 5 2026

IAZ057>059-070>075-081>086-092>097-061845-
Audubon-Guthrie-Dallas-Cass-Adair-Madison-Warren-Marion-Mahaska-
Adams-Union-Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-
Wayne-Appanoose-Davis-
137 PM CDT Fri Jun 5 2026

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered thunderstorms are expected to develop this evening and
overnight. The risk for severe weather is low/medium (2 out of
5). Locally heavy rainfall, gusty winds, large hail, and a
tornado or two are possible. A Flood Watch has been issued across
southern Iowa.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Continued thunderstorm chances continue through midweek next week
but the severe weather risk will be determined in the coming
days.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotter activation may be needed.

IAZ004>007-015>017-023>028-033>039-044>050-060>062-061845-
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-Polk-Jasper-Poweshiek-
137 PM CDT Fri Jun 5 2026

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered thunderstorms are possible this evening and overnight.
The risk for severe weather is low (1 out of 5). Locally heavy
rainfall, gusty winds, large hail, and a tornado or two are
possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Continued thunderstorm chances continue through midweek next week
but the severe weather risk will be determined in the coming
days.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotter activation may be needed.

MPX

Preliminary Local Storm Report
National Weather Service Des Moines IA
1109 PM CDT Fri Jun 5 2026

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

1101 PM     Tstm Wnd Gst     Griswold                41.23N 95.14W
06/05/2026  M65 MPH          Cass               IA   Public

            Measured from personal weather station.

&&

JR

Preliminary Local Storm Report
National Weather Service Des Moines IA
1110 PM CDT Fri Jun 5 2026

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

1110 PM     Tstm Wnd Gst     7 SE Griswold           41.17N 95.02W
06/05/2026  M59 MPH          Cass               IA   Mesonet

            Measured from personal weather station.

&&

JR

Preliminary Local Storm Report
National Weather Service Des Moines IA
1121 PM CDT Fri Jun 5 2026

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

1118 PM     Tstm Wnd Gst     Knoxville               41.32N 93.10W
06/05/2026  M70 MPH          Marion             IA   Mesonet

            Measured from personal weather station.

&&

JR

Preliminary Local Storm Report
National Weather Service Des Moines IA
1125 PM CDT Fri Jun 5 2026

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

1118 PM     Hail             3 S Massena             41.20N 94.76W
06/05/2026  M1.50 Inch       Cass               IA   Public

            Reports of power flashes and ping pong ball
            sized hail south of Massena.

&&

JR

Preliminary Local Storm Report
National Weather Service Des Moines IA
1128 PM CDT Fri Jun 5 2026

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

1100 PM     Tstm Wnd Dmg     Pleasantville           41.39N 93.27W
06/05/2026                   Marion             IA   Emergency Mngr

            Report of tree on house in Pleasantville.
            Time estimated from radar.

&&

JR

Preliminary Local Storm Report
National Weather Service Des Moines IA
1141 PM CDT Fri Jun 5 2026

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

1139 PM     Hail             2 N Attica              41.26N 93.01W
06/05/2026  M1.00 Inch       Marion             IA   Public

            Report from mPING: Quarter (1.00 in.).

&&

90