River Flood Warning 9, NWS Sioux Falls, SD

761 
WGUS83 KFSD 310128
FLSFSD

Flood Statement
National Weather Service Sioux Falls SD
828 PM CDT Wed Jul 30 2025

...The Flood Warning is extended for the following rivers in Iowa...

  Floyd River at Alton affecting Sioux and Plymouth Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Additional forecast information is available at 
www.weather.gov/siouxfalls.

The next statement will be issued by Thursday evening.

&&

IAC149-167-010330-
/O.EXT.KFSD.FL.W.0009.250731T0128Z-250801T0700Z/
/ALTI4.1.ER.250731T0100Z.250731T0115Z.250731T0700Z.NO/
828 PM CDT Wed Jul 30 2025

...FLOOD WARNING NOW IN EFFECT FROM THIS EVENING TO EARLY FRIDAY 
MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Floyd River at Alton.

* WHEN...From this evening to early Friday morning.

* IMPACTS...At 12.0 feet, Flooding begins to affect the lower lying 
  agricultural lands along the river.

* ADDITIONAL DETAILS...
  - At 8:15 PM CDT Wednesday the stage was 12.3 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:15 PM CDT Wednesday was 12.3 feet.
  - Forecast...The river is expected to fall below flood stage
    just after midnight tonight and continue falling to 6.5 feet
    Monday evening.
  - Flood stage is 12.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (7 pm CDT)     
Location   Stg    Stg    Day/Time   Thu   Fri   Sat          

Floyd River
Alton      12.0   12.3   Wed 8 pm   9.2   7.2   6.8          


&&

LAT...LON 4308 9594 4308 9587 4290 9605 4290 9612
      4296 9606


$$

Dux

999 
WGUS83 KFSD 310254
FLSFSD

Flood Statement
National Weather Service Sioux Falls SD
954 PM CDT Wed Jul 30 2025

...The Flood Warning continues for the following rivers in South 
Dakota...Iowa...

  Big Sioux River near Bruce affecting Brookings County.

  Big Sioux River near Estelline affecting Brookings and Hamlin 
  Counties.

  Floyd River at Alton affecting Sioux and Plymouth Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

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

Additional forecast information is available at 
www.weather.gov/siouxfalls.

The next statement will be issued by late Thursday night.

&&

IAC149-167-010500-
/O.CON.KFSD.FL.W.0009.000000T0000Z-250801T0700Z/
/ALTI4.1.ER.250731T0100Z.250731T0245Z.250731T0700Z.NO/
954 PM CDT Wed Jul 30 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL EARLY FRIDAY MORNING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Floyd River at Alton.

* WHEN...Until early Friday morning.

* IMPACTS...At 12.0 feet, Flooding begins to affect the lower lying 
  agricultural lands along the river.

* ADDITIONAL DETAILS...
  - At 9:45 PM CDT Wednesday the stage was 13.0 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 PM CDT Wednesday was 13.0 feet.
  - Forecast...The river is expected to rise near 13.7 feet and
    then fall below flood stage just after midnight tonight and
    continue falling to 6.5 feet Monday evening.
  - Flood stage is 12.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (7 pm CDT)     
Location   Stg    Stg    Day/Time   Thu   Fri   Sat          

Floyd River
Alton      12.0   13.0   Wed 9 pm   9.2   7.2   6.8          


&&

LAT...LON 4308 9594 4308 9587 4290 9605 4290 9612
      4296 9606


$$

SDC011-010500-
/O.CON.KFSD.FL.W.0008.000000T0000Z-000000T0000Z/
/BRCS2.1.ER.250729T1230Z.250731T0230Z.000000T0000Z.NO/
954 PM CDT Wed Jul 30 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring.

* WHERE...Big Sioux River near Bruce.

* WHEN...Until further notice.

* IMPACTS...At 9.5 feet, The right bank overflows flooding 
  agricultural lands for as much as 1/4 mile.

* ADDITIONAL DETAILS...
  - At 9:45 PM CDT Wednesday the stage was 9.5 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 PM CDT Wednesday was 9.5 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 8.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Bruce          8.0    9.5    Wed 9 pm   MSG   MSG   MSG          


&&

LAT...LON 4450 9690 4450 9684 4449 9688 4440 9689
      4433 9687 4433 9692 4442 9693


$$

SDC011-057-010500-
/O.CON.KFSD.FL.W.0007.000000T0000Z-000000T0000Z/
/BSES2.2.ER.250728T1322Z.250729T0645Z.000000T0000Z.UU/
954 PM CDT Wed Jul 30 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Moderate flooding is occurring.

* WHERE...Big Sioux River near Estelline.

* WHEN...Until further notice.

* IMPACTS...At 1645.5 feet, widespread flooding of agricultural 
  lands begins.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Wednesday the stage was 1645.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:00 PM CDT Wednesday was 1645.8 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 1644.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Estelline      1644.0 1645.6 Wed 9 pm   MSG   MSG   MSG          


&&

LAT...LON 4462 9700 4463 9696 4450 9684 4450 9690


$$

Dux

697 
WGUS83 KFSD 311325
FLSFSD

Flood Statement
National Weather Service Sioux Falls SD
825 AM CDT Thu Jul 31 2025

...The Flood Warning is extended for the following rivers in Iowa...

  Floyd River at Alton affecting Sioux and Plymouth Counties.

...The Flood Warning continues for the following rivers in South 
Dakota...

  Big Sioux River near Bruce affecting Brookings County.

  Big Sioux River near Estelline affecting Hamlin and Brookings 
  Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

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

Additional forecast information is available at 
www.weather.gov/siouxfalls.

The next statement will be issued by Friday morning.

&&

IAC149-167-011530-
/O.EXT.KFSD.FL.W.0009.000000T0000Z-250802T0336Z/
/ALTI4.1.ER.250731T0100Z.250731T1130Z.250801T0336Z.NO/
825 AM CDT Thu Jul 31 2025

...FLOOD WARNING NOW IN EFFECT UNTIL LATE TOMORROW EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Floyd River at Alton.

* WHEN...Until late tomorrow evening.

* IMPACTS...At 12.0 feet, Flooding begins to affect the lower lying 
  agricultural lands along the river.

* ADDITIONAL DETAILS...
  - At 8:15 AM CDT Thursday the stage was 13.4 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:15 AM CDT Thursday was 13.4 feet.
  - Forecast...The river is currently cresting as of Thursday
    morning and is expected to fall below flood stage late this
    evening and continue falling to 6.5 feet Tuesday morning.
  - Flood stage is 12.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (7 am CDT)     
Location   Stg    Stg    Day/Time   Fri   Sat   Sun          

Floyd River
Alton      12.0   13.4   Thu 8 am   9.8   6.8   6.7          


&&

LAT...LON 4308 9594 4308 9587 4290 9605 4290 9612
      4296 9606


$$

SDC011-011530-
/O.CON.KFSD.FL.W.0008.000000T0000Z-000000T0000Z/
/BRCS2.1.ER.250729T1230Z.250731T0945Z.000000T0000Z.NO/
825 AM CDT Thu Jul 31 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring.

* WHERE...Big Sioux River near Bruce.

* WHEN...Until further notice.

* IMPACTS...At 9.5 feet, The right bank overflows flooding 
  agricultural lands for as much as 1/4 mile.

* ADDITIONAL DETAILS...
  - At 7:45 AM CDT Thursday the stage was 9.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 7:45 AM CDT Thursday was 9.6 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 8.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Bruce          8.0    9.6    Thu 7 am   MSG   MSG   MSG          


&&

LAT...LON 4450 9690 4450 9684 4449 9688 4440 9689
      4433 9687 4433 9692 4442 9693


$$

SDC011-057-011530-
/O.CON.KFSD.FL.W.0007.000000T0000Z-000000T0000Z/
/BSES2.2.ER.250728T1322Z.250729T0645Z.000000T0000Z.UU/
825 AM CDT Thu Jul 31 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Moderate flooding is occurring.

* WHERE...Big Sioux River near Estelline.

* WHEN...Until further notice.

* IMPACTS...At 1645.5 feet, widespread flooding of agricultural 
  lands begins.

* ADDITIONAL DETAILS...
  - At 8:00 AM CDT Thursday the stage was 1645.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 8:00 AM CDT Thursday was 1645.7 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 1644.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Estelline      1644.0 1645.6 Thu 8 am   MSG   MSG   MSG          


&&

LAT...LON 4462 9700 4463 9696 4450 9684 4450 9690


$$

Kalin

541 
WGUS83 KFSD 311546
FLSFSD

Flood Statement
National Weather Service Sioux Falls SD
1046 AM CDT Thu Jul 31 2025

...The Flood Warning continues for the following rivers in South 
Dakota...Iowa...

  Big Sioux River near Bruce affecting Brookings County.

  Big Sioux River near Estelline affecting Hamlin and Brookings 
  Counties.

  Floyd River at Alton affecting Sioux and Plymouth Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

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

Additional forecast information is available at 
www.weather.gov/siouxfalls.

The next statement will be issued by Friday afternoon.

&&

IAC149-167-011800-
/O.CON.KFSD.FL.W.0009.000000T0000Z-250802T0336Z/
/ALTI4.1.ER.250731T0100Z.250731T1130Z.250801T0336Z.NO/
1046 AM CDT Thu Jul 31 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL LATE TOMORROW EVENING...

* WHAT...Minor flooding is occurring and minor flooding is forecast.

* WHERE...Floyd River at Alton.

* WHEN...Until late tomorrow evening.

* IMPACTS...At 12.0 feet, Flooding begins to affect the lower lying 
  agricultural lands along the river.

* ADDITIONAL DETAILS...
  - At 10:30 AM CDT Thursday the stage was 13.1 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 10:30 AM CDT Thursday was 13.4 feet.
  - Forecast...The river is currently cresting as of Thursday
    morning and is expected to fall below flood stage late this
    evening and continue falling to 6.5 feet Tuesday morning.
  - Flood stage is 12.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (1 pm CDT)     
Location   Stg    Stg    Day/Time   Fri   Sat   Sun          

Floyd River
Alton      12.0   13.1   Thu 10 am  8.3   6.7   6.7          


&&

LAT...LON 4308 9594 4308 9587 4290 9605 4290 9612
      4296 9606


$$

SDC011-011800-
/O.CON.KFSD.FL.W.0008.000000T0000Z-000000T0000Z/
/BRCS2.1.ER.250729T1230Z.250731T1445Z.000000T0000Z.NO/
1046 AM CDT Thu Jul 31 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Minor flooding is occurring.

* WHERE...Big Sioux River near Bruce.

* WHEN...Until further notice.

* IMPACTS...At 9.5 feet, The right bank overflows flooding 
  agricultural lands for as much as 1/4 mile.

* ADDITIONAL DETAILS...
  - At 9:45 AM CDT Thursday the stage was 9.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 9:45 AM CDT Thursday was 9.6 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 8.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Bruce          8.0    9.6    Thu 9 am   MSG   MSG   MSG          


&&

LAT...LON 4450 9690 4450 9684 4449 9688 4440 9689
      4433 9687 4433 9692 4442 9693


$$

SDC011-057-011800-
/O.CON.KFSD.FL.W.0007.000000T0000Z-000000T0000Z/
/BSES2.2.ER.250728T1322Z.250729T0645Z.000000T0000Z.UU/
1046 AM CDT Thu Jul 31 2025

...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...

* WHAT...Moderate flooding is occurring.

* WHERE...Big Sioux River near Estelline.

* WHEN...Until further notice.

* IMPACTS...At 1645.5 feet, widespread flooding of agricultural 
  lands begins.

* ADDITIONAL DETAILS...
  - At 10:00 AM CDT Thursday the stage was 1645.6 feet.
  - Recent Activity...The maximum river stage in the 24 hours
    ending at 10:00 AM CDT Thursday was 1645.6 feet.
  - Forecast...No forecast is available for this location.
  - Flood stage is 1644.0 feet.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

               Fld    Observed          Forecasts (unknown time) 
Location       Stg    Stg    Day/Time   d1    d2    d3           

Big Sioux River
Estelline      1644.0 1645.6 Thu 10 am  MSG   MSG   MSG          


&&

LAT...LON 4462 9700 4463 9696 4450 9684 4450 9690


$$

Kalin

256 
WGUS83 KFSD 010215
FLSFSD

Flood Statement
National Weather Service Sioux Falls SD
915 PM CDT Thu Jul 31 2025

...The Flood Warning is cancelled for the following rivers in Iowa...

  Floyd River At Le Mars affecting Plymouth County.

  Floyd River at Alton affecting Plymouth and Sioux Counties.

IAC149-010315-
/O.CAN.KFSD.FL.W.0010.000000T0000Z-250801T0215Z/
/LMRI4.1.ER.250731T2203Z.000000T0000Z.250731T2248Z.NO/
915 PM CDT Thu Jul 31 2025

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Floyd River At Le Mars.

* ADDITIONAL DETAILS...
  - At 8:15 PM CDT Thursday the stage was 19.8 feet.
  - Forecast...The river is expected to fall to 12.4 feet Tuesday
    evening.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (7 pm CDT)     
Location   Stg    Stg    Day/Time   Fri   Sat   Sun          

Floyd River
Le Mars    20.0   19.8   Thu 8 pm   16.1  13.7  12.9         


&&

LAT...LON 4290 9612 4290 9605 4279 9616 4273 9620
      4275 9623 4279 9620


$$

IAC149-167-010315-
/O.CAN.KFSD.FL.W.0009.000000T0000Z-250801T0215Z/
/ALTI4.1.ER.250731T0100Z.250731T1130Z.250731T1943Z.NO/
915 PM CDT Thu Jul 31 2025

...FLOOD WARNING IS CANCELLED...

The Flood Warning is cancelled for
  the Floyd River at Alton.

* ADDITIONAL DETAILS...
  - At 9:00 PM CDT Thursday the stage was 10.0 feet.
  - Forecast...The river is expected to fall to 6.5 feet early
    Tuesday afternoon.
  - Stay up to date with the latest river observations and
    forecasts at: www.water.noaa.gov

&&

           Fld    Observed          Forecasts (7 pm CDT)     
Location   Stg    Stg    Day/Time   Fri   Sat   Sun          

Floyd River
Alton      12.0   10.0   Thu 9 pm   7.0   6.7   6.7          


&&

LAT...LON 4308 9594 4308 9587 4290 9605 4290 9612
      4296 9606


$$

JM

Area Forecast Discussion
National Weather Service Sioux Falls SD
557 PM CDT Wed Jul 30 2025

.KEY MESSAGES...

- Potential for some very localized heavy rain this afternoon
  and evening, mainly south of I-90. A few funnel cloud are also
  likely.

- Below normal temperatures settle in through early next week.

- Some smoke mainly aloft will be possible the remainder of the
  week.

- Sunday should be the next chance for a few severe storms but
  for now this threat appears to remain isolated. Tuesday night
  appears to be the next chance for severe storms after Sunday
  with what looks to be a bit better chance for scattered severe
  storms. However, uncertainty remains in the coverage and
  severity with this potential activity.

&&

.DISCUSSION...
Issued at 222 PM CDT Wed Jul 30 2025

Today should be the final day of the deeper moisture that has been
aiding in producing almost daily thunderstorms across the area. A
weak MCV will continue to weaken in southeast SD this afternoon.
This should be the focus for a few showers and thunderstorms. The hi-
res models that have this suggest the an storms that develop should
be mainly south of I-90. That area has had quite a bit of rain the
past week. Storm motion looks pretty slow and model soundings have
relatively weak CAPE (500-1000 J/kg) with the freezing level around
12-13 kft, so likely some efficient rainers. The HRRR and ARW seem
to be handling things best thus far. The Nam 3KM and NSSL have
convection in northwest IA from 12-15z this morning which is not
happening so they are being ruled out. The models handling the MCV
better are producing a small area of 1-3", possibly up to 4" which
would fall over a short period of time with the focused area south
of I-90 in far southeast SD then into northwest IA. For now the
better chances will be between Sioux Falls and Sioux City, but will
monitor for any changes in this subtle, weakly forced environment.
Along with the threat for pockets of heavy rain will be a few funnel
clouds. Winds in the lowest few thousand feet are very light and a
weak boundary is also in place in far southern SD and northwest IA
along with very low LFC/LCL. All of this hints that a few funnels
are likely during the initial updraft phase but for now production
of a tornado looks unlikely.

Any shower and thunderstorms activity should pretty much follow the
diurnal cycle with most activity done by 10 pm to midnight. Through
the night drier and more stable northeast flow will bring quieter
weather Thursday into Friday with seasonally cool temperatures.
Highs will be in the 70s to around 80 with lows in the 50s to near
60.

On Friday night troughiness to the west develops and swings a mid
level wave into central SD. The LLJ increases with a focus more to
the west of the area, but this forcing does creep towards the James
Valley. Overall instability looks pretty low so only very isolates
severe is expected.

Saturday into Saturday night continues to indicate a decent LLJ into
the area with troughiness and a mid level wave rotating through.
This will keep chances for showers and thunderstorms in place, but
the severe threat continues to look very isolated.

Sunday will continue the chances for showers and thunderstorms with
a slight increase in the threat for a few severe storms. The upper
level troughiness begins to slip eastward with a bit stronger
northwest flow aloft providing a bump in shear. Will continue to
monitor trends with upcoming model runs.

Thunderstorm chances continue into early next week. There may be a
lull Monday night into Tuesday, but by Tuesday afternoon into
Tuesday night a stronger jet/wave moves onto the Northern Plains
and could bring the next better chance for scattered severe storms.

Temperatures Tuesday into Wednesday will climb back to around
normal.

&&

.AVIATION /00Z TAFS THROUGH 00Z FRIDAY/...
Issued at 554 PM CDT Wed Jul 30 2025

VFR rain and scattered thunderstorms will continue to sink
southward late this afternoon and evening. Gradually this
precipitation will come to an end leaving a VFR ceiling in place
through the night. Latest guidance maintains a high broken VFR
ceiling into Thursday in most locations as winds remain light
from the northeast.

Minor visibility restrictions may begin to develop due to
wildfire smoke drifting southward into Thursday. Most upstream
observations remain above 4SM, but will hint at some minor haze
through mid-day Thursday.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
IA...None.
NE...None.

&&

DISCUSSION...08
AVIATION...Dux

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
1031 AM CDT Wed Jul 30 2025

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-311545-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-
McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-
Yankton-Union-
1031 AM CDT Wed Jul 30 2025

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, southwest Minnesota, northeast Nebraska,
central South Dakota, east central South Dakota, south central
South Dakota, and southeast South Dakota.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms will be possible by early
afternoon and continue into the evening. While severe weather is
not expected, some patchy heavy rain will be possible. The better
chance for heavier rain, amounting to 1 to 3 inches in a short
period of time, will be roughly between interstate 90 and the
Missouri River in southeast South Dakota then into northwest Iowa.
This amount of rain, due to saturated ground, could cause some
localized streams and creeks to overflow as well as some street
flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Additional chances for showers and thunderstorms will occur over the
weekend. However, uncertainty remains in severity and coverage.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
252 PM CDT Wed Jul 30 2025

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

0930 PM     Tornado          1 E Alvord              43.34N 96.27W
07/28/2025                   Lyon               IA   NWS Storm Survey

            Mangled trees south of a convergent cord
            damage path.

&&

JC

Special Weather Statement
National Weather Service Sioux Falls SD
320 PM CDT Wed Jul 30 2025

IAZ001>003-012>014-020>022-031-032-NEZ013-014-SDZ050-063>071-
302300-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Douglas-
Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Union-
Including the cities of Rock Rapids, George, Inwood, Larchwood,
Sibley, Spirit Lake, Milford, Arnolds Park, Sioux Center,
Orange City, Rock Valley, Hawarden, Hull, Sheldon, Hartley,
Sanborn, Spencer, Le Mars, Cherokee, Storm Lake, Sioux City,
Ida Grove, Holstein, Battle Creek, Wakefield, Ponca, Allen,
South Sioux City, Gregory, Burke, Wagner, Platte, Lake Andes,
Marty, Armour, Corsica, Delmont, Parkston, Freeman, Menno, Tripp,
Clayton, Parker, Centerville, Marion, Viborg, Irene, Hurley,
Chancellor, Canton, Lennox, Tea, Harrisburg, Tyndall, Scotland,
Springfield, Avon, Tabor, Yankton, Vermillion, North Sioux City,
Beresford, Elk Point, Alcester, and Jefferson
320 PM CDT Wed Jul 30 2025

...FUNNEL CLOUDS POSSIBLE ACROSS SOUTHERN SOUTH DAKOTA INTO
NORTHEAST NEBRASKA AND NORTHWEST IOWA...

Showers and isolated thunderstorms have developed across
southeast South Dakota and northwest Iowa. Conditions are
favorable for funnel clouds with any activity that develops. These
types of funnel clouds are usually short lived and weak, and
usually will not touch the ground or cause damage. However, if you
see a funnel cloud and feel your safety is threatened, please
seek shelter.

Preliminary Local Storm Report...Summary
National Weather Service Sioux Falls SD
456 PM CDT Wed Jul 30 2025

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

0510 PM     Tstm Wnd Dmg     5 S Chamberlain         43.74N 99.31W
07/29/2025                   Brule              SD   CO-OP Observer

            Several trees blown over. Very strong winds
            tore off part of roof of house.

0542 PM     Tstm Wnd Gst     14 W Platte             43.39N 99.12W
07/29/2025  M61 MPH          Charles Mix        SD   Mesonet

            Mesonet station 154 SD RWIS Platte-Winner
            Bridge.

0546 PM     Tstm Wnd Gst     9 SW Platte             43.30N 98.99W
07/29/2025  M59 MPH          Charles Mix        SD   Mesonet

            Public Mesonet Wind Observation.

0608 PM     Tstm Wnd Dmg     7 N Platte              43.49N 98.85W
07/29/2025                   Charles Mix        SD   Trained Spotter

            Strong winds. Large healthy tree branch
            down, estimated 8-9 inches in diameter. Time
            estimated via radar.

0618 PM     Tstm Wnd Gst     5 W Plankinton          43.71N 98.58W
07/29/2025  M60 MPH          Aurora             SD   Mesonet

            Mesonet station 214 SD RWIS Plankinton.

0623 PM     Tstm Wnd Gst     5 W Plankinton          43.71N 98.58W
07/29/2025  M61 MPH          Aurora             SD   Mesonet

            Mesonet station 214 SD RWIS Plankinton.

0646 PM     Tstm Wnd Gst     3 N Mitchell            43.77N 98.04W
07/29/2025  M63 MPH          Davison            SD   ASOS

            ASOS station KMHE Mitchell Municipal
            Airport.

0652 PM     Tstm Wnd Gst     3 S Corsica             43.38N 98.41W
07/29/2025  M63 MPH          Douglas            SD   Mesonet

            Mesonet station 304 SD RWIS Corsica.

0658 PM     Tstm Wnd Gst     8 WNW Dimock            43.51N 98.14W
07/29/2025  M62 MPH          Davison            SD   Mesonet

            Reported via mobile mesonet on X.

0701 PM     Tstm Wnd Gst     4 N Fulton              43.79N 97.83W
07/29/2025  M73 MPH          Hanson             SD   Public

            Personal weather station.

0714 PM     Tstm Wnd Gst     2 NW Tripp              43.24N 97.99W
07/29/2025  M61 MPH          Hutchinson         SD   Mesonet

            Mesonet station 26 SD RWIS Tripp.

0715 PM     Tstm Wnd Gst     4 ENE Alexandria        43.67N 97.71W
07/29/2025  M60 MPH          Hanson             SD   Mesonet

            Mesonet station 213 SD RWIS Alexandria.

0720 PM     Tstm Wnd Gst     2 NW Tripp              43.24N 97.99W
07/29/2025  M68 MPH          Hutchinson         SD   Mesonet

            Mesonet station 26 SD RWIS Tripp.

0725 PM     Hail             1 E Fulda               43.87N 95.59W
07/29/2025  M0.75 Inch       Murray             MN   Public

0732 PM     Tstm Wnd Gst     1 SW Tyndall            42.98N 97.87W
07/29/2025  M60 MPH          Bon Homme          SD   Public

            Personal weather system.

0735 PM     Tstm Wnd Dmg     Bridgewater             43.55N 97.50W
07/29/2025                   McCook             SD   Emergency Mngr

            Scattered tree damage throughout the city of
            Bridgewater.

0735 PM     Tstm Wnd Gst     Bridgewater             43.55N 97.51W
07/29/2025  E75 MPH          McCook             SD   Emergency Mngr

0745 PM     Tstm Wnd Gst     5 S Freeman             43.28N 97.42W
07/29/2025  M62 MPH          Hutchinson         SD   Mesonet

            Mesonet station 163 SD RWIS Freeman.

0745 PM     Tstm Wnd Gst     4 W Dolton              43.48N 97.46W
07/29/2025  M70 MPH          Hutchinson         SD   Public

            Personal weather station.

0745 PM     Hail             4 W Heron Lake          43.79N 95.41W
07/29/2025  M1.00 Inch       Jackson            MN   Public

0749 PM     Tstm Wnd Gst     4 NNE Freeman           43.40N 97.41W
07/29/2025  M75 MPH          Hutchinson         SD   Public

            Personal weather station.

0750 PM     Tstm Wnd Gst     4 N Dolton              43.54N 97.39W
07/29/2025  M67 MPH          McCook             SD   Mesonet

            Mesonet station 322 SD RWIS STANLEY CORNER.

0800 PM     Tstm Wnd Gst     2 ESE Marion            43.41N 97.22W
07/29/2025  M69 MPH          Turner             SD   Public

            Personal weather station.

0805 PM     Tstm Wnd Gst     4 E Dolton              43.49N 97.31W
07/29/2025  M64 MPH          Turner             SD   Public

            Personal weather station.

0806 PM     Tstm Wnd Gst     5 SW Hurley             43.23N 97.17W
07/29/2025  E69 MPH          Turner             SD   Mesonet

            First severe gust at 806 pm, peak of 69 mph
            at 816 pm. Hurley SDSU Mesonet site.

0830 PM     Tstm Wnd Gst     3 ESE Parker            43.37N 97.08W
07/29/2025  M59 MPH          Turner             SD   Mesonet

            Mesonet station 310 SD RWIS Parker.

0833 PM     Tstm Wnd Gst     4 WSW Rowena            43.51N 96.64W
07/29/2025  M59 MPH          Minnehaha          SD   Public

            Personal weather station.

0848 PM     Tstm Wnd Gst     4 E Irene               43.08N 97.08W
07/29/2025  M60 MPH          Turner             SD   Mesonet

            Mesonet station 320 SD RWIS IRENE.

0851 PM     Tstm Wnd Gst     3 SSW Beresford         43.04N 96.80W
07/29/2025  M63 MPH          Union              SD   Mesonet

            Mesonet station 16 SD RWIS Beresford.

0851 PM     Tstm Wnd Gst     6 SSE Centerville       43.04N 96.90W
07/29/2025  M70 MPH          Clay               SD   Mesonet

            Mesonet station BFMS2 Beresford 7 WSW (SD
            Mesonet).

0852 PM     Tstm Wnd Gst     1 SSW Vermillion        42.77N 96.93W
07/29/2025  M61 MPH          Clay               SD   AWOS

            AWOS station KVMR Vermillion.

0854 PM     Tstm Wnd Gst     1 NW Beresford          43.09N 96.79W
07/29/2025  M72 MPH          Lincoln            SD   Public

            Personal weather station.

0855 PM     Tstm Wnd Gst     2 WSW Gayville          42.88N 97.22W
07/29/2025  M58 MPH          Yankton            SD   Mesonet

            Mesonet station 197 SD RWIS Gayville.

0857 PM     Tstm Wnd Gst     1 NNE Beresford         43.09N 96.78W
07/29/2025  M66 MPH          Lincoln            SD   Public

            Personal weather station.

0857 PM     Tstm Wnd Gst     6 N Vermillion          42.86N 96.91W
07/29/2025  M60 MPH          Clay               SD   Public

            Personal weather station.

0900 PM     Tstm Wnd Dmg     Newcastle               42.65N 96.87W
07/29/2025                   Dixon              NE   Trained Spotter

            NE Highway 12 blocked by several large trees
            down in Newcastle.

0905 PM     Tstm Wnd Gst     3 SSW Beresford         43.04N 96.80W
07/29/2025  M73 MPH          Union              SD   Mesonet

            Mesonet station 16 SD RWIS Beresford.

0915 PM     Tstm Wnd Gst     3 NW Ponca              42.59N 96.75W
07/29/2025  M62 MPH          Dixon              NE   Public

            Personal weather station.

0925 PM     Tstm Wnd Dmg     Wakefield               42.27N 96.87W
07/29/2025                   Dixon              NE   CO-OP Observer

            Large section of a 50-60 foot tree down at
            the cemetery. Other spotty wind damage
            around town to tree limbs.

0925 PM     Tstm Wnd Gst     1 E Remsen              42.81N 95.96W
07/29/2025  M62 MPH          Plymouth           IA   Public

            Personal weather station.

0933 PM     Tstm Wnd Gst     4 WSW North Sioux City  42.52N 96.57W
07/29/2025  M67 MPH          Union              SD   Public

            Personal weather station.

0935 PM     Tstm Wnd Gst     3 SE Jefferson          42.57N 96.53W
07/29/2025  M68 MPH          Union              SD   Dept of Highways

            Mesonet station 53 SD RWIS North Sioux City.

0937 PM     Tstm Wnd Gst     4 SSW Newcastle         42.60N 96.91W
07/29/2025  M60 MPH          Dixon              NE   Public

            Personal weather station.

0942 PM     Tstm Wnd Gst     6 SSE Westfield         42.67N 96.55W
07/29/2025  M66 MPH          Plymouth           IA   Mesonet

            Personal weather station.

0959 PM     Tstm Wnd Gst     1 WSW Sioux City        42.50N 96.41W
07/29/2025  M58 MPH          Woodbury           IA   Public

            Personal weather station.

1001 PM     Tstm Wnd Gst     2 SW Sergeant Bluff     42.38N 96.38W
07/29/2025  M59 MPH          Woodbury           IA   ASOS

            ASOS station KSUX Sioux Gateway Airport.

1221 AM     Flash Flood      3 SSW Alton             42.95N 96.03W
07/30/2025                   Sioux              IA   Law Enforcement

            Hwy 60 near 480th closed due the roadway
            being flooded.

0205 AM     Flash Flood      2 NNE Struble           42.92N 96.18W
07/30/2025                   Sioux              IA   Other Federal

            The Floyd River near Struble rose nearly 8
            feet in 3 hours to flood stage.

&&