Alert archive / Minnesota / Flash Flood Warnings in 2025

Flash Flood Warning 19, NWS Twin Cities, MN

August 17, 2025Blue Earth County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 17, 2025, 6:22 AM CDT for Blue Earth County, Watonwan County, Minnesota. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 17, 2025, 6:22 AM CDT (11:22 UTC)
Expired: Aug 17, 2025, 9:15 AM CDT
In force: 3 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Blue Earth County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 104 km from the middle of the area, began a volume at 11:21 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.4 hours before the alert went out and 103 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: 756 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

813 
WGUS53 KMPX 171122
FFWMPX
MNC013-165-171415-
/O.NEW.KMPX.FF.W.0019.250817T1122Z-250817T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in the Twin Cities has issued a

* Flash Flood Warning for...
  West Central Blue Earth County in south central Minnesota...
  Northeastern Watonwan County in south central Minnesota...

* Until 915 AM CDT.

* At 622 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2.5 and 3.5 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  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...
  Lake Crystal, Madelia, Garden City and Minneopa State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4401 9437 4401 9444 4405 9447 4409 9445
      4411 9439 4411 9437 4414 9428 4416 9417
      4416 9411 4412 9409 4404 9417 4401 9431

FLASH FLOOD...RADAR INDICATED

$$

TDH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 9:30 PM CDT	River Flood Warning	MPX	Chippewa, Renville, Yellow Medicine	15 days
Aug 17, 1:15 AM CDT	Flash Flood Warning	MPX	Redwood	6 hr
Aug 17, 1:52 AM CDT	Flash Flood Warning	MPX	Steele, Waseca	6 hr
Aug 17, 2:12 AM CDT	Flash Flood Warning	MPX	Redwood	5 hr
Aug 17, 4:54 AM CDT	Special Weather Statement	MPX	Faribault, Waseca	66 min
Aug 17, 8:14 AM CDT	Flash Flood Warning	MPX	Redwood	3 hr
Aug 17, 8:17 AM CDT	Special Weather Statement	MPX	Brown, Redwood, Watonwan, Yellow Medicine	6 hr
Aug 17, 8:24 AM CDT	Special Weather Statement	MPX	Blue Earth, Faribault, Freeborn, Waseca	5 hr
Aug 17, 10:06 AM CDT	River Flood Warning	MPX	Brown	6 days
Aug 17, 10:06 AM CDT	River Flood Warning	MPX	Brown	6 days
Aug 17, 10:06 AM CDT	River Flood Warning	MPX	Redwood	59 hr
Aug 17, 2:17 PM CDT	Flood Watch	MPX	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more	20 hr
Aug 17, 6:59 PM CDT	Tornado Warning	MPX	Faribault	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.