Alert archive / Minnesota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 187, NWS Grand Forks, ND

September 12, 2025Hubbard County, Otter Tail County, Wadena County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 12, 2025, 8:41 AM CDT for Hubbard County, Otter Tail County, Wadena County, Minnesota. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 12, 2025, 8:41 AM CDT (13:41 UTC)
Expired: Sep 12, 2025, 9:45 AM CDT
In force: 64 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hubbard County, MN, Otter Tail County, MN, Wadena County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 185 km from the middle of the area, began a volume at 13:45 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 12:00Z, 1.7 hours before the alert went out and 240 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1190 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 12, 7:30 AM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, Sep 12, 7:30 AM CDT, 1 hour 11 minutes before

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Hazardous weather outlook, Sep 12, 5:22 AM CDT, 3 hours 19 minutes before

Hazardous Weather Outlook
National Weather Service Grand Forks ND
522 AM CDT Fri Sep 12 2025

MNZ001>009-013>017-022>024-027>032-040-NDZ027-030-039-049-052-053-
131030-
West Polk-Norman-Clay-Kittson-Roseau-Lake Of The Woods-
West Marshall-East Marshall-North Beltrami-Pennington-Red Lake-
East Polk-North Clearwater-South Beltrami-Mahnomen-
South Clearwater-Hubbard-West Becker-East Becker-Wilkin-
West Otter Tail-East Otter Tail-Wadena-Grant-Grand Forks-Traill-
Cass-Ransom-Sargent-Richland-
522 AM CDT Fri Sep 12 2025

This hazardous weather outlook is for portions of eastern North
Dakota, west central and northwest Minnesota.

.DAY ONE...Today and Tonight

Thunderstorms will move out of the northern Red River valley and
northwest Minnesota this morning. Frequent lightning is the main
hazard. Thunderstorms are not anticipated this afternoon or
tonight at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Chances for thunderstorms Sunday afternoon into into Monday
morning. Severe chances are low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today.

NDZ006>008-014>016-024-026-028-029-038-054-131030-
Towner-Cavalier-Pembina-Benson-Ramsey-Eastern Walsh-Eddy-Nelson-
Griggs-Steele-Barnes-Western Walsh-
522 AM CDT Fri Sep 12 2025

This hazardous weather outlook is for portions of eastern North
Dakota.

.DAY ONE...Today and Tonight

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Chances for a few thunderstorms late Saturday and into Sunday
night. Chances for an isolated strong or severe storm.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today.

In the hours before

Special weather statement, Sep 12, 5:11 AM CDT, 3 hours 30 minutes before

Special Weather Statement
National Weather Service Grand Forks ND
511 AM CDT Fri Sep 12 2025

MNZ001-007-013-121045-
Pennington MN-West Polk MN-West Marshall MN-
511 AM CDT Fri Sep 12 2025

...STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN MARSHALL...
NORTHWESTERN POLK AND NORTHWESTERN PENNINGTON COUNTIES THROUGH 545 AM
CDT...

At 510 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Argyle to Tabor to near East Grand Forks.
Movement was southeast at 40 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
East Grand Forks, Warren, Euclid, Angus, Tabor, Radium, and Mallory.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4821 9639 4818 9639 4796 9648 4777 9668
      4792 9702 4796 9706 4800 9705 4810 9695
      4832 9682
TIME...MOT...LOC 1010Z 298DEG 33KT 4827 9679 4808 9688 4799 9698

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Thomas

Local storm report, Sep 12, 5:44 AM CDT, 2 hours 57 minutes before

Preliminary Local Storm Report
National Weather Service Grand Forks ND
544 AM CDT Fri Sep 12 2025

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

0535 AM     Tstm Wnd Gst     Mallory                 47.88N 96.92W
09/12/2025  M55 MPH          Polk               MN   Mesonet

            Mesonet station MN060 E Grand Forks MN DOT.

&&

TT

Local storm report, Sep 12, 6:00 AM CDT, 2 hours 41 minutes before

Preliminary Local Storm Report
National Weather Service Grand Forks ND
600 AM CDT Fri Sep 12 2025

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

0556 AM     Tstm Wnd Gst     3 N Crookston           47.82N 96.61W
09/12/2025  M53 MPH          Polk               MN   Mesonet

            NDAWN Mesonet north of Crookston.

&&

TT

Local storm report, Sep 12, 6:49 AM CDT, 1 hour 52 minutes before

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Local storm report, Sep 12, 6:55 AM CDT, 1 hour 46 minutes before

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Local storm report, Sep 12, 7:21 AM CDT, 1 hour 20 minutes before

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The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 12, 5:11 AM CDT	Special Weather Statement	FGF	Polk	34 min
Sep 12, 5:40 AM CDT	Severe Thunderstorm Warning	FGF	Pennington, Polk, Red Lake	65 min
Sep 12, 6:07 AM CDT	Severe Thunderstorm Warning	FGF	Clearwater, Pennington, Polk, Red Lake	38 min
Sep 12, 12:27 AM CDT	Severe Thunderstorm Warning	FGF	Benson	63 min
Sep 12, 12:46 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Benson	59 min
Sep 12, 1:17 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Towner	58 min
Sep 12, 1:57 AM CDT	Flash Flood Warning	FGF	Benson, Towner	6 hr
Sep 12, 2:02 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	58 min
Sep 12, 2:34 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Benson, Eddy, Nelson, Ramsey, Walsh	56 min
Sep 12, 3:27 AM CDT	Severe Thunderstorm Warning	FGF	Nelson, Ramsey	63 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2025 Every severe thunderstorm 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.