501 
WGUS53 KFSD 170209
FFWFSD
IAC141-143-167-170445-
/O.NEW.KFSD.FF.W.0025.250917T0209Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Sioux Falls SD
909 PM CDT Tue Sep 16 2025

The National Weather Service in Sioux Falls has issued a

* Flash Flood Warning for...
  Northwestern OBrien County in northwestern Iowa...
  Southwestern Osceola County in northwestern Iowa...
  East Central Sioux County in northwestern Iowa...

* Until 1145 PM CDT.

* At 909 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 2 inches of rain have 
  fallen. The expected rainfall rate is 1 to 3 inches in 1 hour. 
  Additional rainfall amounts up to 3 inches are possible in 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...
  Sheldon, Sanborn, Ashton, Melvin and Archer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, dont drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4316 9589 4324 9588 4331 9581 4334 9574
      4334 9563 4326 9557 4317 9564 4314 9566
      4313 9567 4309 9571 4305 9576 4305 9585
      4310 9588

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR

$$

IG

540 
WGUS73 KFSD 170252
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
952 PM CDT Tue Sep 16 2025

IAC167-170302-
/O.CAN.KFSD.FF.W.0025.000000T0000Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sioux IA-
952 PM CDT Tue Sep 16 2025

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL SIOUX COUNTY...

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

&&

LAT...LON 4330 9570 4331 9562 4326 9557 4317 9564
      4314 9566 4313 9567 4312 9570 4311 9573
      4313 9578 4316 9579 4322 9577 4329 9572

$$

IAC141-143-170445-
/O.CON.KFSD.FF.W.0025.000000T0000Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OBrien IA-Osceola IA-
952 PM CDT Tue Sep 16 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT THIS 
EVENING FOR NORTHWESTERN OBRIEN AND SOUTH CENTRAL OSCEOLA 
COUNTIES...

At 952 PM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Up to 2.5 
inches of rain have fallen. Additional rainfall amounts up to 1 inch 
are possible in the warned area. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

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...
  Sanborn, Melvin and Archer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, dont drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4330 9570 4331 9562 4326 9557 4317 9564
      4314 9566 4313 9567 4312 9570 4311 9573
      4313 9578 4316 9579 4322 9577 4329 9572

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

IG

540 
WGUS73 KFSD 170252
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
952 PM CDT Tue Sep 16 2025

IAC167-170302-
/O.CAN.KFSD.FF.W.0025.000000T0000Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sioux IA-
952 PM CDT Tue Sep 16 2025

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL SIOUX COUNTY...

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

&&

LAT...LON 4330 9570 4331 9562 4326 9557 4317 9564
      4314 9566 4313 9567 4312 9570 4311 9573
      4313 9578 4316 9579 4322 9577 4329 9572

$$

IAC141-143-170445-
/O.CON.KFSD.FF.W.0025.000000T0000Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OBrien IA-Osceola IA-
952 PM CDT Tue Sep 16 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT THIS 
EVENING FOR NORTHWESTERN OBRIEN AND SOUTH CENTRAL OSCEOLA 
COUNTIES...

At 952 PM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Up to 2.5 
inches of rain have fallen. Additional rainfall amounts up to 1 inch 
are possible in the warned area. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

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...
  Sanborn, Melvin and Archer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, dont drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4330 9570 4331 9562 4326 9557 4317 9564
      4314 9566 4313 9567 4312 9570 4311 9573
      4313 9578 4316 9579 4322 9577 4329 9572

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

IG

043 
WGUS73 KFSD 170312
FFSFSD

Flash Flood Statement
National Weather Service Sioux Falls SD
1012 PM CDT Tue Sep 16 2025

IAC141-143-170322-
/O.CAN.KFSD.FF.W.0025.000000T0000Z-250917T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OBrien IA-Osceola IA-
1012 PM CDT Tue Sep 16 2025

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN OBRIEN AND 
SOUTH CENTRAL OSCEOLA COUNTIES...

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

&&

LAT...LON 4330 9570 4331 9562 4326 9557 4317 9564
      4314 9566 4313 9567 4312 9570 4311 9573
      4313 9578 4316 9579 4322 9577 4329 9572

$$

IG