Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Grand Forks, ND

June 11, 20216 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 3:23 AM CDT for 6 counties in North Dakota. It was in force for 67 min. 5 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, 3:23 AM CDT (08:23 UTC)
Expired: Jun 11, 2021, 4:30 AM CDT
In force: 67 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Benson County, ND, Eddy County, ND, Griggs County, ND, Nelson County, ND, Ramsey County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 112 km from the middle of the area, began a volume at 08:25 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, 3:56 AM CDT	TSTM WND GST 58	25 E New Rockford, ND	PEAK WIND MEASURED AT AN NDAWN STATION.
Jun 11, 3:56 AM CDT	TSTM WND GST 58	25 E New Rockford, ND	WIND GUST REPORTED OF 58 MPH GUST THROUGH NDAWN.
Jun 11, 4:08 AM CDT	TSTM WND GST 72	2 Ne Pekin, ND	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 2 NE PEKIN. PEAK WIND REPORT AT 10 METER NDAWN SENSOR.
Jun 11, 4:10 AM CDT	TSTM WND GST 65	2 Ne Pekin, ND	65 MPH GUST REPORTED BY NDAWN.
Jun 11, 4:10 AM CDT	TSTM WND GST 72	2 Ne Pekin, ND	PEAK WIND MEASURED AT AN NDAWN STATION AT 10 METERS.

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, 8.4 hours before the alert went out and 190 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.

309 
WUUS53 KFGF 110823
SVRFGF
NDC005-027-039-063-071-091-110930-
/O.NEW.KFGF.SV.W.0034.210611T0823Z-210611T0930Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southeastern Benson County in northeastern North Dakota...
  Nelson County in northeastern North Dakota...
  Northern Griggs County in southeastern North Dakota...
  Southeastern Ramsey County in northeastern North Dakota...
  Eddy County in northeastern North Dakota...
  Northwestern Steele County in southeastern North Dakota...

* Until 430 AM CDT.

* At 323 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles northeast of Bremen to near Carrington,
  moving east at 50 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...
  New Rockford, Lakota, McVille, Fort Totten, Aneta, Sheyenne and
  Tolna.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4820 9828 4819 9827 4763 9787 4754 9850
      4759 9850 4759 9916 4779 9930 4785 9930
      4785 9933 4790 9937
TIME...MOT...LOC 0823Z 248DEG 43KT 4780 9927 4749 9905 

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

Lynch

1 follow-up statement

755 
WWUS53 KFGF 110857
SVSFGF

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

NDC005-027-039-063-071-091-110930-
/O.CON.KFGF.SV.W.0034.000000T0000Z-210611T0930Z/
Benson ND-Nelson ND-Griggs ND-Ramsey ND-Eddy ND-Steele ND-
357 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 AM CDT
FOR SOUTHEASTERN BENSON...NELSON...NORTHERN GRIGGS...SOUTHEASTERN
RAMSEY...EDDY AND NORTHWESTERN STEELE COUNTIES...

At 357 AM CDT, severe thunderstorms were located along a line
extending from Spirit Lake Nation to near Mchenry, moving east at 50
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...
New Rockford, Lakota, McVille, Fort Totten, Aneta, Sheyenne and
Tolna.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4820 9828 4819 9827 4763 9787 4754 9850
      4759 9850 4759 9916 4779 9930 4785 9930
      4785 9933 4790 9937
TIME...MOT...LOC 0857Z 248DEG 43KT 4794 9875 4763 9853 

TORNADO...POSSIBLE
HAIL...<.75IN
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, 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, 4:19 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Nelson, Steele, Traill, Walsh	56 min
Jun 11, 4:28 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey, Steele	62 min
Jun 11, 4:36 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Nelson, Pembina, Ramsey, Towner, Walsh	54 min
Jun 11, 4:42 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Ransom, Richland, Sargent	63 min
Jun 11, 4:47 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele	28 min
Jun 11, 5:07 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Grand Forks, Nelson, Steele, Traill, Walsh	68 min
Jun 11, 5:27 AM CDT	Special Weather Statement	FGF	Cavalier, Pembina, Ramsey, Towner, Walsh	33 min
Jun 11, 5:39 AM CDT	Severe Thunderstorm Warning	FGF	Cass, Richland	66 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 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.