Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Grand Forks, ND

June 11, 20214 counties in Minnesota; 5 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 4:42 AM CDT for 4 counties in Minnesota; 5 counties in North Dakota. It was in force for 63 min. 17 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, 4:42 AM CDT (09:42 UTC)
Expired: Jun 11, 2021, 5:45 AM CDT
In force: 63 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Clay County, MN, Grant County, MN, Otter Tail County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND

The radar

The Aberdeen radar (KABR), 146 km from the middle of the area, began a volume at 09:44 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, 4:55 AM CDT	TSTM WND GST 67	6 N Mcleod, ND	PEAK WIND MEASURED AT A RAWS STATION. TIME ESTIMATED BASED ON RADAR.
Jun 11, 5:08 AM CDT	TSTM WND GST 60	8 W Wahpeton, ND	PEAK WIND MEASURED AT AN NDDOR RWIS STATION.
Jun 11, 5:15 AM CDT	TSTM WND DMG	Moorhead, MN	LARGE TREE BRANCHES AND LIMBS BROKEN DOWN ON VEHICLES. REPORT AND PHOTOS POSTED VIA SOCIAL MEDIA.
Jun 11, 5:15 AM CDT	TSTM WND DMG	Moorhead, MN	WIDE TREES BROKEN LANDING ON VEHICLES; TIME ESTIMATED FROM RADAR. VIA SOCIAL MEDIA PICTURE.
Jun 11, 5:15 AM CDT	TSTM WND GST 60	10 W Wahpeton, ND	ESTIMATED WIND SPEEDS.
Jun 11, 5:15 AM CDT	TSTM WND GST 60	10 W Wahpeton, ND	WIND GUST OF 60MPH 10 MILES WEST OF WAHPETON.
Jun 11, 5:22 AM CDT	HAIL 0.5	1 N Fargo, ND	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Jun 11, 5:23 AM CDT	TSTM WND GST 60	8 W Wahpeton, ND	PEAK WIND MEASURED AT AN NDDOT RWIS STATION.
Jun 11, 5:26 AM CDT	TSTM WND DMG	Wahpeton, ND	LARGE TREES UPROOTED OR SNAPPED OFF. TIME ESTIMATED FROM RADAR.
Jun 11, 5:30 AM CDT	TSTM WND GST 58	1 S Dilworth, MN	PEAK WIND MEASURED AT A MNDOT RWIS STATION.
Jun 11, 5:30 AM CDT	HAIL 1	Fargo, ND
Jun 11, 5:30 AM CDT	HAIL 1	Fargo, ND	MEDIA REPORT FROM SOCIAL MEDIA ACCOUNT.
Jun 11, 5:35 AM CDT	TSTM WND DMG	1 Nnw Moorhead, MN	SEVERAL LARGE TREE BRANCHES BROKEN DOWN.
Jun 11, 5:35 AM CDT	TSTM WND DMG	Wahpeton, ND	LARGE TREES SNAPPED OR UPROOTED. TIME ESTIMATED BASED ON RADAR.
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.

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, 9.7 hours before the alert went out and 189 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.

643 
WUUS53 KFGF 110942
SVRFGF
MNC027-051-111-167-NDC003-017-073-077-081-111045-
/O.NEW.KFGF.SV.W.0040.210611T0942Z-210611T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
442 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...
  Southwestern Otter Tail County in west central Minnesota...
  Northwestern Grant County in west central Minnesota...
  Wilkin County in west central Minnesota...
  Ransom County in southeastern North Dakota...
  Southern Cass County in southeastern North Dakota...
  Southeastern Barnes County in southeastern North Dakota...
  Richland County in southeastern North Dakota...
  Sargent County in southeastern North Dakota...

* Until 545 AM CDT.

* At 442 AM CDT, severe thunderstorms were located along a line
  extending from near Wheatland to near Geneseo, moving east at 60
  mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Fargo, Wahpeton, Moorhead, West Fargo, Dilworth, Breckenridge and
  Barnesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4629 9776 4690 9775 4711 9620 4596 9616
      4596 9626 4602 9627 4602 9657 4595 9657
      4593 9774
TIME...MOT...LOC 0942Z 264DEG 51KT 4693 9728 4602 9729 

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

Lynch

1 follow-up statement

960 
WWUS53 KFGF 111018
SVSFGF

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

NDC003-111027-
/O.CAN.KFGF.SV.W.0040.000000T0000Z-210611T1045Z/
Barnes ND-
518 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BARNES COUNTY IS
CANCELLED...

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

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

LAT...LON 4646 9751 4693 9752 4711 9620 4596 9616
      4596 9626 4602 9627 4602 9657 4595 9657
      4593 9753
TIME...MOT...LOC 1017Z 259DEG 115KT 4695 9681 4604 9683 

$$

MNC027-051-111-167-NDC017-073-077-081-111045-
/O.CON.KFGF.SV.W.0040.000000T0000Z-210611T1045Z/
Clay MN-Otter Tail MN-Grant MN-Wilkin MN-Ransom ND-Cass ND-
Richland ND-Sargent ND-
518 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR CLAY...SOUTHWESTERN OTTER TAIL...NORTHWESTERN GRANT...WILKIN...
EASTERN RANSOM...SOUTHERN CASS...RICHLAND AND EASTERN SARGENT
COUNTIES...

At 517 AM CDT, severe thunderstorms were located along a line
extending from North River to near Hankinson, moving east at 135 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...
Fargo, Wahpeton, Moorhead, West Fargo, Dilworth, Breckenridge and
Barnesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4646 9751 4693 9752 4711 9620 4596 9616
      4596 9626 4602 9627 4602 9657 4595 9657
      4593 9753
TIME...MOT...LOC 1017Z 259DEG 115KT 4695 9681 4604 9683 

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

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, 5:07 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Marshall, Norman, Pennington and 2 more	68 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 North Dakota, 2021 Severe Thunderstorm Warnings in Minnesota, 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.