Alert archive / Minnesota / Flash Flood Warnings in 2025

Flash Flood Warning 21, NWS Twin Cities, MN

August 17, 20254 counties in Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 17, 2025, 9:28 PM CDT for 4 counties in Minnesota. It was in force for 5 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 17, 2025, 9:28 PM CDT (02:28 UTC)
Expired: Aug 18, 2025, 2:30 AM CDT
In force: 5 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Blue Earth County, MN, Faribault County, MN, Steele County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 108 km from the middle of the area, began a volume at 02:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 17, 11:30 PM CDT	FLASH FLOOD	3 Sw Waseca, MN	Waseca County Dispatch reported several closed roads around and within the city of Waseca, including a portion of 110th Street stretching from 325th to 360th.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.5 hours before the alert went out and 108 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 225 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 285 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

114 
WGUS53 KMPX 180228
FFWMPX
MNC013-043-147-161-180730-
/O.NEW.KMPX.FF.W.0021.250818T0228Z-250818T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Twin Cities/Chanhassen MN
928 PM CDT Sun Aug 17 2025

The National Weather Service in the Twin Cities has issued a

* Flash Flood Warning for...
  Southeastern Blue Earth County in south central Minnesota...
  Northern Faribault County in south central Minnesota...
  Steele County in south central Minnesota...
  Waseca County in south central Minnesota...

* Until 230 AM CDT.

* At 928 PM CDT, Broadcast media reported thunderstorms producing 
  heavy rain and ongoing flash flooding in the City of Waseca. 
  Between 1 and 3 inches of rain have fallen across south central 
  Minnesota. Additional rainfall amounts of 1 to 3 inches are 
  possible in the warned area. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Broadcast media reported.

  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...
  Owatonna, Waseca, Blue Earth, Blooming Prairie, Mapleton, 
  Winnebago, Medford, New Richland, Ellendale, Minnesota Lake, 
  Pemberton, Waldorf, Easton, Delavan, Otisco, Lemond, Clinton 
  Falls, Merton, Moland and Hope.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4384 9425 4392 9396 4405 9382 4420 9348
      4420 9305 4385 9305 4385 9365 4379 9365
      4360 9424 4363 9425

FLASH FLOOD...RADAR INDICATED

$$

BED

1 follow-up statement

276 
WGUS73 KMPX 180722
FFSMPX

Flash Flood Statement
National Weather Service Twin Cities/Chanhassen MN
222 AM CDT Mon Aug 18 2025

MNC013-043-147-161-180732-
/O.EXP.KMPX.FF.W.0021.000000T0000Z-250818T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blue Earth MN-Faribault MN-Steele MN-Waseca MN-
222 AM CDT Mon Aug 18 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 230 AM CDT EARLY THIS MORNING 
FOR SOUTHEASTERN BLUE EARTH, NORTHERN FARIBAULT, STEELE AND WASECA 
COUNTIES...

Immediate Flash Flooding threat has ended as we wait for additional 
rainfall to move through the area this morning. With multiple rounds 
of rainfall having moved through over the last 24-36 hours, if it 
appears as though additional heavy rain will be moving through, 
another warning will be immediately issued. Please continue to heed 
remaining road closures.

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

A Flood Watch remains in effect until 1000 AM CDT Monday for 
portions of Minnesota and Wisconsin.

&&

LAT...LON 4384 9425 4392 9396 4405 9382 4420 9348
      4420 9305 4385 9305 4385 9365 4379 9365
      4360 9424 4363 9425

$$

TDH

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 7:08 PM CDT	Tornado Warning	MPX	Faribault, Martin	38 min
Aug 17, 7:26 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Watonwan	49 min
Aug 17, 7:32 PM CDT	Tornado Warning	MPX	Blue Earth, Faribault, Waseca	28 min
Aug 17, 7:55 PM CDT	Tornado Warning	MPX	Waseca	21 min
Aug 17, 8:09 PM CDT	Special Weather Statement	MPX	Blue Earth, Watonwan	36 min
Aug 17, 8:21 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Le Sueur, Nicollet, Sibley, Watonwan	39 min
Aug 17, 8:57 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Le Sueur, Nicollet, Scott, Sibley	48 min
Aug 17, 9:44 PM CDT	Special Weather Statement	MPX	Hennepin	31 min
Aug 17, 10:02 PM CDT	Special Weather Statement	MPX	Dakota, Hennepin, Ramsey, Washington	118 min
Aug 17, 10:32 PM CDT	Flash Flood Warning	MPX	Goodhue, Rice	4 hr
Aug 18, 7:08 AM CDT	Special Weather Statement	MPX	Waseca	82 min

Nearby

Flash Flood Warnings in Minnesota, 2025 Every flash flood warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.