Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Grand Forks, ND

June 6, 202110 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 6, 2021, 2:39 AM CDT for 10 counties in North Dakota. It was in force for 51 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 6, 2021, 2:39 AM CDT (07:39 UTC)
Expired: Jun 6, 2021, 3:30 AM CDT
In force: 51 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Benson County, ND, Cavalier County, ND, Eddy County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Ramsey County, ND, Steele County, ND, Towner County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 110 km from the middle of the area, began a volume at 07:38 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 6, 2:46 AM CDT	TSTM WND GST 66	4 Sw Clyde, ND	VIA NDAWN.
Jun 6, 3:22 AM CDT	TSTM WND GST 60	3 Nw Edmore, ND	VIA NDAWN.
Jun 6, 3:25 AM CDT	TSTM WND GST 62	1 W Milton, ND
Jun 6, 3:33 AM CDT	TSTM WND GST 63	5 N Adams, ND	VIA NDAWN.

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 6, 1:39 AM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.7 hours before the alert went out and 245 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: 1639 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 3032 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

289 
WUUS53 KFGF 060739
SVRFGF
NDC005-019-027-035-039-063-071-091-095-099-060830-
/O.NEW.KFGF.SV.W.0007.210606T0739Z-210606T0830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
239 AM CDT Sun Jun 6 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southeastern Benson County in northeastern North Dakota...
  Eastern Towner County in northeastern North Dakota...
  Cavalier County in northeastern North Dakota...
  Western Grand Forks County in northeastern North Dakota...
  Nelson County in northeastern North Dakota...
  Northern Griggs County in southeastern North Dakota...
  Ramsey County in northeastern North Dakota...
  Western Walsh County in northeastern North Dakota...
  Eastern Eddy County in northeastern North Dakota...
  Northwestern Steele County in southeastern North Dakota...

* Until 330 AM CDT.

* At 238 AM CDT, severe thunderstorms were located along a line
  extending from Penn to Spirit Lake Nation to 6 miles west of
  Pingree, moving east at 60 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Langdon, Park River, Larimore, Lakota, McVille, Michigan and Aneta.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4900 9847 4860 9793 4855 9793 4854 9785
      4826 9747 4762 9769 4745 9850 4759 9850
      4759 9878 4802 9880 4900 9934
TIME...MOT...LOC 0738Z 269DEG 50KT 4820 9912 4794 9872 4716 9905 

HAIL...0.75IN
WIND...60MPH
 
$$

CJ

1 follow-up statement

228 
WWUS53 KFGF 060810
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
310 AM CDT Sun Jun 6 2021

NDC005-027-039-091-060817-
/O.CAN.KFGF.SV.W.0007.000000T0000Z-210606T0830Z/
Benson ND-Griggs ND-Eddy ND-Steele ND-
310 AM CDT Sun Jun 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BENSON...NORTHERN
GRIGGS...EASTERN EDDY AND NORTHWESTERN STEELE COUNTIES IS
CANCELLED...

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

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

LAT...LON 4900 9847 4860 9793 4855 9793 4854 9785
      4826 9747 4795 9758 4783 9852 4791 9853
      4792 9857 4900 9915
TIME...MOT...LOC 0807Z 269DEG 50KT 4821 9853 4795 9814 4717 9848 

$$

NDC019-035-063-071-095-099-060830-
/O.CON.KFGF.SV.W.0007.000000T0000Z-210606T0830Z/
Towner ND-Cavalier ND-Grand Forks ND-Nelson ND-Ramsey ND-Walsh ND-
310 AM CDT Sun Jun 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM CDT
FOR NORTHEASTERN TOWNER...CAVALIER...NORTHWESTERN GRAND FORKS...
NORTHERN NELSON...EASTERN RAMSEY AND WESTERN WALSH COUNTIES...

At 307 AM CDT, severe thunderstorms were located along a line
extending from near Southam to near Michigan to Wimbledon, moving
east at 60 mph.

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

SOURCE...At 2:46 AM CDT, a 66 mph wind gust was reported at the 
         Clyde, ND, NDAWN Mesonet site.
 
IMPACT...Expect considerable tree damage. Damage is likely 
         to mobile homes, roofs, and outbuildings.

Locations impacted include...
Langdon, Park River, Lakota, Michigan, Fordville, Munich and
Edinburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4900 9847 4860 9793 4855 9793 4854 9785
      4826 9747 4795 9758 4783 9852 4791 9853
      4792 9857 4900 9915
TIME...MOT...LOC 0807Z 269DEG 50KT 4821 9853 4795 9814 4717 9848 

HAIL...0.75IN
WIND...70MPH
 
$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 7:24 PM CDT	Special Weather Statement	FGF	Pembina	66 min
Jun 5, 7:47 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina	58 min
Jun 5, 8:44 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	16 min
Jun 6, 1:49 AM CDT	Special Weather Statement	FGF	Benson, Eddy, Towner	56 min
Jun 6, 1:55 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Eddy, Ramsey, Towner	65 min
Jun 6, 2:17 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Towner	43 min
Jun 6, 3:24 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Walsh	66 min
Jun 6, 4:33 AM CDT	Red Flag Warning	FGF	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 8 more	16 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.