Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 41, NWS Grand Forks, ND

June 11, 20214 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 11, 2021, 4:47 AM CDT for 4 counties in North Dakota. It was in force for 28 min. 3 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, 4:47 AM CDT (09:47 UTC)
Expired: Jun 11, 2021, 5:15 AM CDT
In force: 28 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Barnes County, ND, Cass County, ND, Griggs County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 49 km from the middle of the area, began a volume at 09:49 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, 4:47 AM CDT	TSTM WND DMG	Finley, ND	LARGE TREE BRANCHES WERE BROKEN DOWN. ONE TREE WAS SNAPPED.
Jun 11, 4:47 AM CDT	TSTM WND DMG	Finley, ND	LARGE TREE TRUNCK BROKEN OFF.
Jun 11, 4:47 AM CDT	TSTM WND DMG	Finley, ND	LARGE TREE TRUNK BROKEN OFF.

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, 9.8 hours before the alert went out and 220 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.

644 
WUUS53 KFGF 110947
SVRFGF
NDC003-017-039-091-111015-
/O.NEW.KFGF.SV.W.0041.210611T0947Z-210611T1015Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cass County in southeastern North Dakota...
  Eastern Griggs County in southeastern North Dakota...
  Northeastern Barnes County in southeastern North Dakota...
  Western Steele County in southeastern North Dakota...

* Until 515 AM CDT.

* At 447 AM CDT, severe thunderstorms were located along a line
  extending from Finley to near Hope to 7 miles south of Pillsbury,
  moving east at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Valley City, Cooperstown, Finley, Hope, Tower City, Binford and
  Hannaford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4763 9794 4746 9771 4693 9750 4686 9806
      4756 9838
TIME...MOT...LOC 0947Z 254DEG 47KT 4750 9783 4729 9770 4709 9777 

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

Lynch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 3:23 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, 4:19 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, 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.