Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Grand Forks, ND

June 11, 2021Kittson County, Marshall County, Minnesota; 6 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 4:36 AM CDT for Kittson County, Marshall County, Minnesota; 6 counties in North Dakota. It was in force for 54 min. 4 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, 4:36 AM CDT (09:36 UTC)
Expired: Jun 11, 2021, 5:30 AM CDT
In force: 54 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kittson County, MN, Marshall County, MN, Cavalier County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Towner County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 160 km from the middle of the area, began a volume at 09:35 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, 4:50 AM CDT	TSTM WND DMG	Fairdale, ND	LARGE 4 TO 6 INCH DIAMETER BRANCHES BROKEN DOWN.
Jun 11, 4:50 AM CDT	TSTM WND DMG	Fairdale, ND	SEVERAL LARGE 4 TO 6 INCH DIAMETE TREE BRANCHES BROKEN DOWN AROUND TOWN.
Jun 11, 5:15 AM CDT	TSTM WND DMG	3 N Mountain, ND	A TREE WAS BLOWN DOWN ACROSS HIGHWAY 32.
Jun 11, 5:20 AM CDT	TSTM WND DMG	3 Ssw Walhalla, ND	A TREE WAS BLOWN DOWN ACROSS HIGHWAY 32.

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

Bismarck Municip, ND (KBIS), launched 00:00Z, 9.6 hours before the alert went out and 277 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: 1785 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 2484 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

As transmitted.

548 
WUUS53 KFGF 110936
SVRFGF
MNC069-089-NDC019-063-067-071-095-099-111030-
/O.NEW.KFGF.SV.W.0039.210611T0936Z-210611T1030Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Northwestern Marshall County in northwestern Minnesota...
  Southwestern Kittson County in northwestern Minnesota...
  Eastern Towner County in northeastern North Dakota...
  Cavalier County in northeastern North Dakota...
  North central Nelson County in northeastern North Dakota...
  Ramsey County in northeastern North Dakota...
  Walsh County in northeastern North Dakota...
  Pembina County in northeastern North Dakota...

* Until 530 AM CDT.

* At 435 AM CDT, severe thunderstorms were located along a line
  extending from near Sarles to near Brocket, moving east at 75 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated. A 60 mph wind gust was reported at 
           Clyde, ND in Cavalier County.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Grafton, Langdon, Park River, Cavalier, Walhalla, Drayton and
  Pembina.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4900 9920 4900 9724 4854 9688 4805 9880
      4892 9943
TIME...MOT...LOC 0935Z 252DEG 66KT 4896 9909 4818 9840 

HAIL...<.75IN
WIND...60MPH
 
$$

Lynch

1 follow-up statement

008 
WWUS53 KFGF 111025
SVSFGF

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

MNC069-089-NDC019-063-067-071-095-099-111035-
/O.EXP.KFGF.SV.W.0039.000000T0000Z-210611T1030Z/
Marshall MN-Kittson MN-Towner ND-Cavalier ND-Nelson ND-Ramsey ND-
Walsh ND-Pembina ND-
525 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MARSHALL...
SOUTHWESTERN KITTSON...EASTERN TOWNER...CAVALIER...NORTH CENTRAL
NELSON...RAMSEY...WALSH AND PEMBINA COUNTIES WILL EXPIRE AT 530 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 gusty
winds are still possible with these thunderstorms.

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

LAT...LON 4900 9920 4900 9724 4854 9688 4805 9880
      4892 9943
TIME...MOT...LOC 1025Z 252DEG 66KT 4923 9778 4845 9710 

$$

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, 4:42 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, 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.