Alert archive / Minnesota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 201, NWS Grand Forks, ND

September 11, 2026Wadena County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 11, 2026, 7:37 PM CDT for Wadena County, Minnesota. It was in force for 53 min. 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
Sep 11, 2026, 7:37 PM CDT (00:37 UTC)
Expired
Sep 11, 2026, 8:30 PM CDT
In force
53 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Tornado
Possible
Damage threat
Considerable
Hail
1.75 in
Wind
60.0 mph

County Wadena County, MN

The radar

The Minneapolis radar (KMPX), 203 km from the middle of the area, began a volume at 00:40 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

TimeReportWhereRemark
Sep 11, 7:38 PM CDTHAIL 1Blue Grass, MN

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 11, 6:39 PM CDTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 201 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2026-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 235 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2026-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 143 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
235 J/kg
Mixed-layer CIN
-300 J/kg
Mixed-layer LCL
1734 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
143 m²/s²
0-3 km storm-relative helicity
392 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

027 
WUUS53 KFGF 120037
SVRFGF
MNC159-120130-
/O.NEW.KFGF.SV.W.0201.260912T0037Z-260912T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
737 PM CDT Fri Sep 11 2026

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southern Wadena County in central Minnesota...

* Until 830 PM CDT.

* At 737 PM CDT, a severe thunderstorm was located near Verndale, or
  40 miles west of Brainerd, moving east at 45 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Wadena, Verndale, Staples Airport, Aldrich, Blue Grass, and Oylen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4637 9473 4637 9516 4649 9515 4663 9479
      4662 9478 4639 9478 4640 9476 4638 9475
      4638 9473
TIME...MOT...LOC 0037Z 265DEG 38KT 4645 9504 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DJR
2 follow-up statements
746 
WWUS53 KFGF 120103
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
803 PM CDT Fri Sep 11 2026

MNC159-120130-
/O.CON.KFGF.SV.W.0201.000000T0000Z-260912T0130Z/
Wadena MN-
803 PM CDT Fri Sep 11 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR SOUTHERN WADENA COUNTY...

At 803 PM CDT, severe thunderstorms were located along a line
extending from near Oylen to Wadena, moving east at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Wadena, Verndale, Staples Airport, Aldrich, and Oylen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4637 9473 4637 9516 4649 9515 4662 9478
      4639 9478 4640 9476 4638 9475 4638 9473
TIME...MOT...LOC 0103Z 275DEG 28KT 4651 9481 4643 9514 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DJR
694 
WWUS53 KFGF 120121
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
821 PM CDT Fri Sep 11 2026

MNC159-120130-
/O.EXP.KFGF.SV.W.0201.000000T0000Z-260912T0130Z/
Wadena MN-
821 PM CDT Fri Sep 11 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WADENA COUNTY WILL
EXPIRE AT 830 PM CDT...

The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However, small
hail, gusty winds and heavy rain are still possible with these
thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
central and west central Minnesota.

&&

LAT...LON 4637 9473 4637 9516 4649 9515 4662 9478
      4639 9478 4640 9476 4638 9475 4638 9473
TIME...MOT...LOC 0120Z 265DEG 38KT 4652 9457 4644 9490 

$$

DJR

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 11, 5:50 PM CDT, 1 hour 47 minutes earlier. Its key messages:

  • There is a level 2 out of 5 risk for severe storms late Friday afternoon into the evening for portions of west central into north central Minnesota. Storms will be capable of producing all hazards.
  • There is a high chance for soaking rainfall Sunday night into Monday night across the region which could impact outdoor activities.
Area forecast discussion, Sep 11, 5:50 PM CDT, 1 hour 47 minutes before
Area Forecast Discussion
National Weather Service Grand Forks ND
550 PM CDT Fri Sep 11 2026

.KEY MESSAGES...

- There is a level 2 out of 5 risk for severe storms late Friday
  afternoon into the evening for portions of west central into
  north central Minnesota. Storms will be capable of producing
  all hazards.

- There is a high chance for soaking rainfall Sunday night into
  Monday night across the region which could impact outdoor
  activities.

&&

.DISCUSSION...
Issued at 230 PM CDT Fri Sep 11 2026

...Synopsis...

A cold front is pushing through the Northern Plains this afternoon,
keeping temperatures in the north in the 60s. Meanwhile ahead of the
front in far southeastern ND into west central MN, temperatures have
reached the mid 80s, and dew points have climbed into the mid 60s,
creating a narrow, couple of county wide axis of instability. As the
cold front propagates through during the late afternoon and evening
hours, thunderstorms are anticipated to develop, some of which will
become strong to severe.

Over the weekend, a large upper low will dig into the Pacific
Northwest. Tracking eastward by late Sunday into Monday, widespread
rain is forecasted for the Northern Plains. Behind this system,
zonal flow will keep temperatures in the 60s most days. Rising
heights late next week may bring a few 70s back into the forecast.

...Severe Risk Today...

A cold front pushing eastward will provide the catalyst for
thunderstorm development late this afternoon into the evening hours.
Latest satellite imagery shows a developing stratocumulus field
ahead of the front in Grant, Otter Tail and Wadena Counties.
Capping is forecast to erode between 4 and 5 o'clock. As it
erodes, the expectation is for storms to develop along the
front, which should then be situated in the western reaches of
the current SPC severe weather level 2 out of 5 risk area.
Storms will have a narrow but rich axis of instability to work
with, with MLCAPE approaching 3000 J/Kg, and effective shear of
around 40 knots. Meanwhile, across eastern South Dakota, a
surface low is propagating eastward/northeastward. In west
central MN, closer to where this surface low will be located by
this evening, more low level curvature within hodographs will
foster the potential for a tornado or two. Further north
(especially north of US Highway 2), hodographs are straighter,
keeping the severe risk tied more to a hail and wind threat
instead of tornado. One big question is how quickly storm mode
becomes messy. The front should provide strong enough forcing
for several updrafts to go up at once. If this occurs, the
window for truly discrete storms will be shorter, leaving the
potential for significant hail and a tornado or two shorter in
duration. Activity will cluster and grow upscale as it pushes
eastward, leaving our FA around 10 PM this evening.

...Late Weekend into Early Next Week Rainfall...

A large upper low over the Pacific Northwest will propagate eastward
towards the Northern Plains late Sunday into Monday. Very little
instability appears in place, therefore severe weather is not
expected. However, as the low tracks from southwest to northeast
across the Northern Plains and Canadian Prairies, rainfall will
overspread the region from west to east Sunday night, lasting into
Monday. While there remains uncertainty in where the deformation
band and heaviest rainfall will set up, with NBM probabilities
for a half inch of rain is about 60 percent across the entire
FA.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 550 PM CDT Fri Sep 11 2026

A cold will continue moving across northwest and west central MN
this evening, with medium to high probabilities of thunderstorms
in its vicinity, including at KBJI. A period of low VFR ceilings
is also expected behind the front, but with only a 20% chance of
MVFR ceilings at KTVF and KBJI this evening. North-northwest
winds behind the front will decrease after sunset, but then will
increase once again during the day Saturday. High confidence
exists in peak gusts from 25 to 28 kts during the day Saturday at
KGFK, KFAR, KDVL, and KTVF, though gusts will start to diminish
toward the end of the TAF valid time (e.g., closer to 00Z).

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.

&&

DISCUSSION...Rafferty
AVIATION...CJS
Hazardous weather outlook, Sep 11, 2:21 PM CDT, 5 hours 16 minutes before
Hazardous Weather Outlook
National Weather Service Grand Forks ND
221 PM CDT Fri Sep 11 2026

MNZ001-002-004-005-007-008-013>015-NDZ006>008-014>016-024-026>030-
038-039-049-052-054-121930-
West Polk-Norman-Kittson-Roseau-West Marshall-East Marshall-
Pennington-Red Lake-East Polk-Towner-Cavalier-Pembina-Benson-
Ramsey-Eastern Walsh-Eddy-Nelson-Grand Forks-Griggs-Steele-Traill-
Barnes-Cass-Ransom-Sargent-Western Walsh-
221 PM CDT Fri Sep 11 2026

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

.DAY ONE...This Afternoon and Tonight

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today.

MNZ003-006-009-016-017-022>024-027>032-040-NDZ053-121930-
Clay-Lake Of The Woods-North Beltrami-North Clearwater-
South Beltrami-Mahnomen-South Clearwater-Hubbard-West Becker-
East Becker-Wilkin-West Otter Tail-East Otter Tail-Wadena-Grant-
Richland-
221 PM CDT Fri Sep 11 2026

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

.DAY ONE...This Afternoon and Tonight

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a level 2 out of 5 risk for severe thunderstorms mid
afternoon into the evening. The main hazards will be hail up the
size of golf balls, damaging winds up to 70 mph, with a tornado or
two possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today.

In the hours before

Local storm report, Sep 11, 6:39 PM CDT, 58 minutes before
Preliminary Local Storm Report
National Weather Service Grand Forks ND
639 PM CDT Fri Sep 11 2026

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

0638 PM     Hail             4.8 SW Herman           45.76N 96.21W
09/11/2026  M1.25 Inch       Grant              MN   Trained Spotter

&&
Local storm report, Sep 11, 6:51 PM CDT, 46 minutes before
Preliminary Local Storm Report
National Weather Service Grand Forks ND
651 PM CDT Fri Sep 11 2026

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

0647 PM     Hail             2 SSE Norcross          45.84N 96.17W
09/11/2026  M1.25 Inch       Grant              MN   Trained Spotter

&&

TT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 7:02 PM CDTSevere Thunderstorm Warning Considerable damage threatFGFOtter Tail, Wadena58 min
Sep 11, 7:05 PM CDTSevere Thunderstorm WarningFGFOtter Tail55 min
Sep 11, 7:12 PM CDTTornado WarningFGFOtter Tail, Wadena48 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2026Every severe thunderstorm warning in 2026

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.