Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Grand Forks, ND

June 11, 20218 counties in Minnesota; 6 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 5:07 AM CDT for 8 counties in Minnesota; 6 counties in North Dakota. It was in force for 68 min. 19 reports 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: Jun 11, 2021, 5:07 AM CDT (10:07 UTC)
Expired: Jun 11, 2021, 6:15 AM CDT
In force: 68 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Becker County, MN, Clay County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Cass County, ND, Grand Forks County, ND, Nelson County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 42 km from the middle of the area, began a volume at 10:09 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
Jun 11, 5:07 AM CDT	TSTM WND DMG	Reynolds, ND	DOWNED TREES AND POWER LINES; POWER OUT IN REYNOLDS; TIME ESTIMATED FROM RADAR.
Jun 11, 5:07 AM CDT	TSTM WND DMG	Reynolds, ND	DOWNED TREES AND POWER LINES. TIME ESTIMATED BASED ON RADAR.
Jun 11, 5:10 AM CDT	HAIL 1.25	Argusville, ND	PHOTO AND REPORT POSTED VIA SOCIAL MEDIA.
Jun 11, 5:10 AM CDT	HAIL 1.25	Argusville, ND	TIME ESTIMATED FROM RADAR. VIA TWITTER.
Jun 11, 5:13 AM CDT	TSTM WND GST 56	8 W Ada, MN	PEAK WIND MEASURED AT A MNDOT RWIS STATION.
Jun 11, 5:13 AM CDT	TSTM WND GST 62	3 Ne Blanchard, ND	PEAK WIND MEASURED AT A PERSONAL WEATHER STATION.
Jun 11, 5:15 AM CDT	TSTM WND GST 59	6 E Perley, MN	PEAK WIND MEASURED AT AN NDAN STATION.
Jun 11, 5:15 AM CDT	TSTM WND GST 59	6 E Perley, MN	PEAK WIND MEASURED AT AN NDAWN STATION AT 3 METERS.
Jun 11, 5:19 AM CDT	TSTM WND DMG	Fisher, MN	FIVE TREES BLOWN DOWN IN A YARD. TIME ESTIMATED BASED ON RADAR.
Jun 11, 5:19 AM CDT	TSTM WND DMG	Fisher, MN	FIVE TREES DOWN, ONE PARTIALLY UPROOTED. TIME ESTIMATED FROM RADAR.
Jun 11, 5:22 AM CDT	TSTM WND GST 63	5 Wnw Grand Forks, ND	PEAK WIND MEASURED AT THE GRAND FORKS AIRPORT /KGFK/.
Jun 11, 5:22 AM CDT	TSTM WND GST 63	Grand Forks, ND	AP IN GRAND FORKS VIA ASOS REPORTED 63MPH GUST.
Jun 11, 5:26 AM CDT	TSTM WND DMG	2 E Reynolds, ND	A TRACTOR-TRAILER RIG WAS FLIPPED ALONG INTERSTATE 29.
Jun 11, 5:26 AM CDT	TSTM WND DMG	Reynolds, ND	SEMI TIPPED/ROLLED OVER.
Jun 11, 5:40 AM CDT	TSTM WND DMG	6 E Felton, MN	BARN IS DESTROYED; RELAYED VIA SOCIAL MEDIA; TIME ESTIMATED FROM RADAR.
Jun 11, 5:40 AM CDT	TSTM WND GST 80	6 Ene Felton, MN	A TALL, TWO STALL GARAGE WAS COLLAPSED BY THE WIND. SEVERAL TREES WERE SNAPPED OR UPROOTED IN THE SURROUNDING AREA. TIME ESTIMATED BASED ON RADAR.
Jun 11, 5:52 AM CDT	TSTM WND DMG	2 S Hillsboro, ND	SEMI TIPPED OVER.
Jun 11, 5:52 AM CDT	TSTM WND DMG	2 S Hillsboro, ND	A TRACTOR-TRAILER RIG WAS FLIPPED ALONG INTERSTATE 29.
Jun 11, 5:53 AM CDT	TSTM WND GST 52	Perley, MN	PEAK WIND MEASURED AT AN NDDOT RWIS STATION.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 11, 1:58 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 10.1 hours before the alert went out and 279 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: 3 J/kg
Mixed-layer CIN: -692 J/kg
Mixed-layer LCL: 1305 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

957 
WUUS53 KFGF 111007
SVRFGF
MNC005-027-087-089-107-113-119-125-NDC017-035-063-091-097-099-111115-
/O.NEW.KFGF.SV.W.0042.210611T1007Z-210611T1115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
507 AM CDT Fri Jun 11 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Northern Clay County in northwestern Minnesota...
  Norman County in northwestern Minnesota...
  Western Pennington County in northwestern Minnesota...
  Western Marshall County in northwestern Minnesota...
  Red Lake County in northwestern Minnesota...
  Polk County in northwestern Minnesota...
  Western Mahnomen County in northwestern Minnesota...
  Northwestern Becker County in northwestern Minnesota...
  Grand Forks County in northeastern North Dakota...
  Southern Walsh County in northeastern North Dakota...
  Eastern Nelson County in northeastern North Dakota...
  Northern Cass County in southeastern North Dakota...
  Traill County in southeastern North Dakota...
  Eastern Steele County in southeastern North Dakota...

* Until 615 AM CDT.

* At 507 AM CDT, severe thunderstorms were located along a line
  extending from Forest River to near Gardner, moving east at 40 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Gardner and Grandin around 510 AM CDT.
  Perley, Poland and Hendrum around 520 AM CDT.
  Warsaw around 525 AM CDT.

Other locations in the path of these severe thunderstorms include
Oslo, Big Woods and Alvarado.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4797 9596 4717 9571 4691 9752 4742 9771
      4820 9829 4854 9684
TIME...MOT...LOC 1007Z 252DEG 35KT 4820 9744 4719 9696 

HAIL...<.75IN
WIND...70MPH
 
$$

Lynch

3 follow-up statements

311 
WWUS53 KFGF 111018 RRA
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
518 AM CDT Fri Jun 11 2021

MNC005-027-087-089-107-113-119-125-NDC017-035-063-091-097-099-111115-
/O.CON.KFGF.SV.W.0042.000000T0000Z-210611T1115Z/
Clay MN-Norman MN-Pennington MN-Marshall MN-Red Lake MN-Polk MN-
Mahnomen MN-Becker MN-Grand Forks ND-Walsh ND-Nelson ND-Cass ND-
Traill ND-Steele ND-
518 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT
FOR NORTHERN CLAY...NORMAN...WESTERN PENNINGTON...WESTERN MARSHALL...
RED LAKE...POLK...WESTERN MAHNOMEN...NORTHWESTERN BECKER...GRAND
FORKS...SOUTHERN WALSH...EASTERN NELSON...NORTHERN CASS...TRAILL AND
EASTERN STEELE COUNTIES...

At 518 AM CDT, severe thunderstorms were located along a line
extending from near Ardoch to near Hendrum, moving east at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Grand Forks, East Grand Forks, Crookston, Grand Forks AFB, Mayville,
Ada and Hillsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4797 9596 4717 9571 4691 9752 4742 9771
      4820 9829 4854 9684
TIME...MOT...LOC 1018Z 252DEG 35KT 4823 9730 4722 9682 

HAIL...1.00IN
WIND...70MPH
 
$$

Lynch

363 
WWUS53 KFGF 111041
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
541 AM CDT Fri Jun 11 2021

MNC005-027-087-089-107-113-119-125-NDC017-035-063-091-097-099-111115-
/O.CON.KFGF.SV.W.0042.000000T0000Z-210611T1115Z/
Clay MN-Norman MN-Pennington MN-Marshall MN-Red Lake MN-Polk MN-
Mahnomen MN-Becker MN-Grand Forks ND-Walsh ND-Nelson ND-Cass ND-
Traill ND-Steele ND-
541 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT
FOR NORTHERN CLAY...NORMAN...WESTERN PENNINGTON...WESTERN MARSHALL...
RED LAKE...POLK...WESTERN MAHNOMEN...NORTHWESTERN BECKER...GRAND
FORKS...SOUTHEASTERN WALSH...NORTHEASTERN NELSON...NORTHEASTERN
CASS...TRAILL AND NORTHEASTERN STEELE COUNTIES...

At 541 AM CDT, severe thunderstorms were located along a line
extending from near Big Woods to Ada, moving east at 40 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...
Grand Forks, East Grand Forks, Crookston, Grand Forks AFB, Mayville,
Ada and Hillsboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4797 9596 4717 9571 4694 9735 4752 9753
      4823 9813 4854 9684
TIME...MOT...LOC 1041Z 252DEG 35KT 4830 9699 4729 9651 

HAIL...1.00IN
WIND...60MPH
 
$$

Lynch

115 
WWUS53 KFGF 111108
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
608 AM CDT Fri Jun 11 2021

MNC005-027-087-089-107-113-119-125-NDC017-035-063-091-097-099-111118-
/O.EXP.KFGF.SV.W.0042.000000T0000Z-210611T1115Z/
Clay MN-Norman MN-Pennington MN-Marshall MN-Red Lake MN-Polk MN-
Mahnomen MN-Becker MN-Grand Forks ND-Walsh ND-Nelson ND-Cass ND-
Traill ND-Steele ND-
608 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CLAY...NORMAN...
WESTERN PENNINGTON...WESTERN MARSHALL...RED LAKE...POLK...WESTERN
MAHNOMEN...NORTHWESTERN BECKER...GRAND FORKS...SOUTHEASTERN WALSH...
NORTHEASTERN NELSON...NORTHEASTERN CASS...TRAILL AND NORTHEASTERN
STEELE COUNTIES WILL EXPIRE AT 615 AM 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
and gusty winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
northwestern Minnesota...and southeastern and northeastern North
Dakota.

LAT...LON 4797 9596 4717 9571 4694 9735 4752 9753
      4823 9813 4854 9684
TIME...MOT...LOC 1108Z 252DEG 35KT 4838 9663 4737 9615 

$$

Lynch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 4:19 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Marshall, Norman, Polk	56 min
Jun 11, 4:36 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall	54 min
Jun 11, 4:42 AM CDT	Severe Thunderstorm Warning	FGF	Clay, Grant, Otter Tail, Wilkin	63 min
Jun 11, 5:39 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Clearwater, Grant, Mahnomen, Otter Tail and 1 more	66 min
Jun 11, 6:07 AM CDT	Special Weather Statement	FGF	Clearwater, Mahnomen, Marshall, Norman, Pennington, Polk and 1 more	68 min
Jun 11, 6:39 AM CDT	Special Weather Statement	FGF	Becker, Grant, Hubbard, Otter Tail, Wadena	66 min
Jun 11, 3:23 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey, Steele	67 min
Jun 11, 3:36 AM CDT	Special Weather Statement	FGF	Barnes, Griggs, Steele	54 min
Jun 11, 3:48 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele	57 min
Jun 11, 4:07 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland, Sargent	38 min
Jun 11, 4:11 AM CDT	Special Weather Statement	FGF	Benson, Cavalier, Pembina, Ramsey, Towner, Walsh	64 min
Jun 11, 4:28 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey, Steele	62 min
Jun 11, 4:47 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele	28 min
Jun 11, 5:27 AM CDT	Special Weather Statement	FGF	Cavalier, Pembina, Ramsey, Towner, Walsh	33 min
Jun 11, 9:57 AM CDT	Wind Advisory	FGF	Barnes, Benson, Cavalier, Eddy, Griggs, Nelson and 4 more	11 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Severe Thunderstorm Warnings in North Dakota, 2021 Every severe thunderstorm warning in 2021

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.