Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Grand Forks, ND

June 11, 20217 counties in Minnesota; Cass County, Richland County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 5:39 AM CDT for 7 counties in Minnesota; Cass County, Richland County, North Dakota. It was in force for 66 min. 7 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, 5:39 AM CDT (10:39 UTC)
Expired: Jun 11, 2021, 6:45 AM CDT
In force: 66 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Becker County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Mahnomen County, MN, Otter Tail County, MN, Wilkin County, MN, Cass County, ND, Richland County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 173 km from the middle of the area, began a volume at 10:42 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, 5:40 AM CDT	TSTM WND DMG	1 Ese Breckenridge, MN	LARGE 6 TO 8 INCH DIAMETER TREE BRANCHES BROKEN DOWN.
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, 5:44 AM CDT	TSTM WND GST 67	2 Ene Barnesville, MN	PEAK WIND MEASURED AT A PERSONAL WEATHER STATION.
Jun 11, 6:00 AM CDT	TSTM WND DMG	2 E Pelican Rapids, MN	DOCK,PONTOON,AND LIFT FLIPPED. TIME ESTIMATED BASED ON RADAR.
Jun 11, 6:00 AM CDT	TSTM WND DMG	Breckenridge, MN	LARGE TREE BRANCHES DOWN, LESS THAN 10 INCH DIAMETER.
Jun 11, 6:00 AM CDT	TSTM WND DMG	Pelican Rapids, MN	DOCK AND PONTOON FLIPPED OVER.
Jun 11, 6:15 AM CDT	TORNADO	2 Nw Clitherall, MN	RELAYED VIDEO FROM SOCIAL MEDIA BROADCAST PARTNER.

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

Aberdeen, SD (KABR), launched 00:00Z, 10.7 hours before the alert went out and 229 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: 1337 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 2725 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

690 
WUUS53 KFGF 111039
SVRFGF
MNC005-027-029-051-087-111-167-NDC017-077-111145-
/O.NEW.KFGF.SV.W.0043.210611T1039Z-210611T1145Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Clay County in northwestern Minnesota...
  Otter Tail County in west central Minnesota...
  Grant County in west central Minnesota...
  Wilkin County in west central Minnesota...
  Southeastern Mahnomen County in northwestern Minnesota...
  Becker County in northwestern Minnesota...
  South central Clearwater County in northwestern Minnesota...
  Southeastern Cass County in southeastern North Dakota...
  Richland County in southeastern North Dakota...

* Until 645 AM CDT.

* At 538 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles west of Hitterdal to Campbell, moving east
  at 60 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...
  Fargo, Fergus Falls, Detroit Lakes, Wahpeton, Moorhead, West Fargo
  and Dilworth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4602 9627 4602 9657 4593 9656 4594 9702
      4699 9710 4723 9542 4657 9526 4611 9527
      4611 9577 4576 9576 4576 9625
TIME...MOT...LOC 1038Z 264DEG 51KT 4698 9639 4607 9642 

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

Lynch

3 follow-up statements

015 
WUUS53 KFGF 111047 CCA
SVRFGF
MNC005-027-029-051-087-111-167-NDC017-077-111200-
/O.COR.KFGF.SV.W.0043.210611T1039Z-210611T1145Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Clay County in northwestern Minnesota...
  Otter Tail County in west central Minnesota...
  Grant County in west central Minnesota...
  Wilkin County in west central Minnesota...
  Southeastern Mahnomen County in northwestern Minnesota...
  Becker County in northwestern Minnesota...
  South central Clearwater County in northwestern Minnesota...
  Southeastern Cass County in southeastern North Dakota...
  Richland County in southeastern North Dakota...

* Until 645 AM CDT.

* At 546 AM CDT, severe thunderstorms were located along a line
  extending from Hitterdal to near Nashua, moving east at 55 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...
  Fargo, Fergus Falls, Detroit Lakes, Wahpeton, Moorhead, West Fargo
  and Dilworth.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4602 9627 4602 9657 4593 9656 4594 9702
      4699 9710 4723 9542 4657 9526 4611 9527
      4611 9577 4576 9576 4576 9625
TIME...MOT...LOC 1046Z 264DEG 51KT 4698 9639 4607 9642 

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

Lynch

949 
WWUS53 KFGF 111115
SVSFGF

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

NDC017-077-111123-
/O.CAN.KFGF.SV.W.0043.000000T0000Z-210611T1145Z/
Cass ND-Richland ND-
615 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CASS AND RICHLAND
COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Gusty winds remain possible. Therefore, the warning has been 
cancelled.

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

LAT...LON 4576 9625 4602 9626 4602 9658 4608 9655
      4632 9660 4644 9672 4658 9676 4658 9675
      4663 9679 4663 9680 4681 9680 4692 9675
      4702 9683 4723 9542 4657 9526 4611 9527
      4611 9577 4576 9576
TIME...MOT...LOC 1113Z 264DEG 51KT 4702 9585 4611 9589 

$$

MNC005-027-029-051-087-111-167-111145-
/O.CON.KFGF.SV.W.0043.000000T0000Z-210611T1145Z/
Clay MN-Otter Tail MN-Grant MN-Wilkin MN-Mahnomen MN-Becker MN-
Clearwater MN-
615 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 AM CDT
FOR CLAY...OTTER TAIL...GRANT...WILKIN...SOUTHEASTERN MAHNOMEN...
BECKER AND SOUTH CENTRAL CLEARWATER COUNTIES...

At 613 AM CDT, severe thunderstorms were located along a line
extending from White Earth Nation to near Ashby, moving east at 60
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...
Fergus Falls, Detroit Lakes, Moorhead, Dilworth, Breckenridge, Perham
and Barnesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4576 9625 4602 9626 4602 9658 4608 9655
      4632 9660 4644 9672 4658 9676 4658 9675
      4663 9679 4663 9680 4681 9680 4692 9675
      4702 9683 4723 9542 4657 9526 4611 9527
      4611 9577 4576 9576
TIME...MOT...LOC 1113Z 264DEG 51KT 4702 9585 4611 9589 

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

Lynch

968 
WWUS53 KFGF 111136
SVSFGF

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

MNC005-027-029-051-087-111-167-111145-
/O.EXP.KFGF.SV.W.0043.000000T0000Z-210611T1145Z/
Clay MN-Otter Tail MN-Grant MN-Wilkin MN-Mahnomen MN-Becker MN-
Clearwater MN-
636 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR CLAY...OTTER TAIL...GRANT...
WILKIN...SOUTHEASTERN MAHNOMEN...BECKER AND SOUTH CENTRAL CLEARWATER
COUNTIES WILL EXPIRE AT 645 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 and west central Minnesota...and southeastern North
Dakota.

LAT...LON 4576 9625 4602 9626 4602 9658 4608 9655
      4632 9660 4644 9672 4658 9676 4658 9675
      4663 9679 4663 9680 4681 9680 4692 9675
      4702 9683 4723 9542 4657 9526 4611 9527
      4611 9577 4576 9576
TIME...MOT...LOC 1135Z 264DEG 51KT 4705 9541 4614 9546 

$$

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, 5:07 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Marshall, Norman, Pennington and 2 more	68 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.