Alert archive / Minnesota / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 173, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 21, 2025, 7:55 PM CDT for 4 counties in Minnesota. It was in force for 50 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
- Aug 21, 2025, 7:55 PM CDT (00:55 UTC)
- Expired
- Aug 21, 2025, 8:45 PM CDT
- In force
- 50 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Marshall County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 99 km from the middle of the area, began a volume at 00:57 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 0.9 hours before the alert went out and 364 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.
- Mixed-layer CAPE
- 271 J/kg
- Mixed-layer CIN
- -228 J/kg
- Mixed-layer LCL
- 1847 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- -85 m²/s²
- 0-3 km storm-relative helicity
- 3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.5
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 Aug 21, 7:06 PM CDT, 49 minutes earlier.
Area forecast discussion, Aug 21, 7:06 PM CDT, 49 minutes before
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</html>Hazardous weather outlook, Aug 21, 5:28 PM CDT, 2 hours 27 minutes before
Hazardous Weather Outlook National Weather Service Grand Forks ND 528 PM CDT Thu Aug 21 2025 MNZ004-007-NDZ007-008-016-026>030-038-049-052-054-222230- Kittson-West Marshall-Cavalier-Pembina-Eastern Walsh-Nelson- Grand Forks-Griggs-Steele-Traill-Barnes-Ransom-Sargent- Western Walsh- 528 PM CDT Thu Aug 21 2025 This hazardous weather outlook is for portions of eastern North Dakota and northwest Minnesota. .DAY ONE...Tonight There is a level 1 out of 5 risk for severe thunderstorms this afternoon and evening for northeast North Dakota and northwest Minnesota and late afternoon and evening southeast North Dakota and west central Minnesota. The main hazards will be potential for wind gusts to 75 mph and hail to golf ball size. .DAYS TWO THROUGH SEVEN...Friday through Wednesday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required today. NDZ006-014-015-024-222230- Towner-Benson-Ramsey-Eddy- 528 PM CDT Thu Aug 21 2025 This hazardous weather outlook is for portions of eastern North Dakota. .DAY ONE...Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today. MNZ001>003-005-006-008-009-013>017-022>024-027>032-040-NDZ039-053- 222230- West Polk-Norman-Clay-Roseau-Lake Of The Woods-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- Cass-Richland- 528 PM CDT Thu Aug 21 2025 This hazardous weather outlook is for portions of eastern North Dakota, west central and northwest Minnesota. .DAY ONE...Tonight There is a level 2 out of 5 risk for severe thunderstorms this afternoon and evening for southeast North Dakota and northwest Minnesota and late afternoon and evening southeast North Dakota and west central Minnesota. The main hazards will be potential for wind gusts to 75 mph and hail to golf ball size. There is a low a low probability for isolated tornadoes. .DAYS TWO THROUGH SEVEN...Friday through Wednesday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required today.
In the hours before
Local storm report, Aug 21, 5:46 PM CDT, 2 hours 9 minutes before
Preliminary Local Storm Report
National Weather Service Grand Forks ND
546 PM CDT Thu Aug 21 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0529 PM Tornado 5 WSW Lamars 45.94N 96.78W
08/21/2025 Richland ND Trained Spotter
Observed tornado riding the North
Dakota/South Dakota state line.
&&Local storm report, Aug 21, 5:52 PM CDT, 2 hours 3 minutes before
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</html>Local storm report, Aug 21, 6:50 PM CDT, 1 hour 5 minutes before
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</html>The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 3:00 AM CDT | Wind Advisory | FGF | Kittson, Marshall, Pennington, Polk, Red Lake, Roseau | 17 hr |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2025Every 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.