Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Grand Forks, ND

August 9, 2021Eddy County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2021, 6:59 PM CDT for Eddy County, North Dakota. It was in force for 31 min. 2 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: Aug 9, 2021, 6:59 PM CDT (23:59 UTC)
Expired: Aug 9, 2021, 7:30 PM CDT
In force: 31 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Possible
Damage threat: Destructive
Hail: 2.75 in
Wind: 70.0 mph

County Eddy County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 107 km from the middle of the area, began a volume at 00:02 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
Aug 9, 7:01 PM CDT	HAIL 1.75	3 Ene Brantford, ND
Aug 9, 7:30 PM CDT	HAIL 1.25	6 S Hamar, ND	VERY HEAVY RAINS ANDA FEW QUARTER TO HALF DOLLAR SIZED HAIL.

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
Aug 9, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 12.0 hours before the alert went out and 180 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: 851 J/kg
Mixed-layer CIN: -361 J/kg
Mixed-layer LCL: 1736 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

570 
WUUS53 KFGF 092359
SVRFGF
NDC027-100030-
/O.NEW.KFGF.SV.W.0082.210809T2359Z-210810T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
659 PM CDT Mon Aug 9 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Eastern Eddy County in northeastern North Dakota...

* Until 730 PM CDT.

* At 659 PM CDT, a severe thunderstorm was located 7 miles northeast
  of Brantford, or 30 miles south of Devils Lake, moving east at 35
  mph.

  THIS IS A DESTRUCTIVE STORM FOR SOUTHEASTERN EDDY COUNTY.

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

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be severely injured. 
           Expect shattered windows, extensive damage to roofs, 
           siding, and vehicles.

* This severe thunderstorm will remain over mainly rural areas of
  eastern Eddy County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter such as an interior room, a
bathroom, closet or basement.

&&

LAT...LON 4771 9901 4785 9853 4767 9852 4767 9850
      4759 9850 4759 9902
TIME...MOT...LOC 2359Z 250DEG 30KT 4768 9882 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CJ

1 follow-up statement

467 
WWUS53 KFGF 100019
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
719 PM CDT Mon Aug 9 2021

NDC027-100030-
/O.CON.KFGF.SV.W.0082.000000T0000Z-210810T0030Z/
Eddy ND-
719 PM CDT Mon Aug 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR EASTERN EDDY COUNTY...

At 719 PM CDT, a severe thunderstorm was located 7 miles south of
Hamar, or 29 miles southeast of Devils Lake, moving east at 35 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
eastern Eddy County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

&&

LAT...LON 4785 9853 4767 9852 4767 9850 4759 9850
      4759 9880 4776 9884
TIME...MOT...LOC 0019Z 250DEG 30KT 4774 9858 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:24 PM CDT	Special Weather Statement	FGF	Pierce	36 min
Aug 9, 5:38 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Benson, Eddy	52 min
Aug 9, 6:03 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Benson, Eddy	57 min
Aug 9, 6:12 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Towner	63 min
Aug 9, 6:56 PM CDT	Special Weather Statement	FGF	Towner	34 min

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.