Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 79, NWS Grand Forks, ND

August 9, 2021Benson County, Eddy County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2021, 5:38 PM CDT for Benson County, Eddy County, North Dakota. It was in force for 52 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, 5:38 PM CDT (22:38 UTC)
Expired: Aug 9, 2021, 6:30 PM CDT
In force: 52 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.5 in
Wind: 70.0 mph

Counties Benson County, ND, Eddy County, ND

The radar

The Minot AFB radar (KMBX), 110 km from the middle of the area, began a volume at 22:38 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
Aug 9, 5:55 PM CDT	HAIL 1	6 Ese Esmond, ND	DIME TO QUARTER SIZED HAIL ACROSS NORTHERN HESPER TOWNSHIP. HAILED OFF AN ON FOR ABOUT 5 MINUTES.
Aug 9, 6:00 PM CDT	HAIL 0.5	6 E Esmond, ND	PEA TO MARBLE SIZED HAIL FOR 5 TO 10 MINUTES.

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, 10.6 hours before the alert went out and 155 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.

342 
WUUS53 KFGF 092238
SVRFGF
NDC005-027-092330-
/O.NEW.KFGF.SV.W.0079.210809T2238Z-210809T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
538 PM CDT Mon Aug 9 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Benson County in northeastern North Dakota...
  Northwestern Eddy County in northeastern North Dakota...

* Until 630 PM CDT.

* At 537 PM CDT, a severe thunderstorm was located near Heimdal, or
  44 miles southwest of Devils Lake, moving northeast at 40 mph.

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  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.

* Locations impacted include...
  Flora, Oberon and Sheyenne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4808 9985 4803 9910 4774 9908 4767 9930
      4785 9930 4785 9981 4802 9981 4802 9985
TIME...MOT...LOC 2237Z 238DEG 34KT 4774 9967 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CJ

2 follow-up statements

735 
WWUS53 KFGF 092258
SVSFGF

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

NDC027-092308-
/O.CAN.KFGF.SV.W.0079.000000T0000Z-210809T2330Z/
Eddy ND-
558 PM CDT Mon Aug 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN EDDY COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern North Dakota.

LAT...LON 4805 9938 4785 9952 4785 9981 4802 9981
      4802 9985 4808 9985
TIME...MOT...LOC 2258Z 238DEG 34KT 4785 9942 

$$

NDC005-092330-
/O.CON.KFGF.SV.W.0079.000000T0000Z-210809T2330Z/
Benson ND-
558 PM CDT Mon Aug 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR SOUTHWESTERN BENSON COUNTY...

At 558 PM CDT, a severe thunderstorm was located near Bremen, or 31
miles southwest of Devils Lake, moving northeast at 40 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Maddock and Esmond. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4805 9938 4785 9952 4785 9981 4802 9981
      4802 9985 4808 9985
TIME...MOT...LOC 2258Z 238DEG 34KT 4785 9942 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CJ

855 
WWUS53 KFGF 092320
SVSFGF

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

NDC005-092330-
/O.EXP.KFGF.SV.W.0079.000000T0000Z-210809T2330Z/
Benson ND-
620 PM CDT Mon Aug 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BENSON COUNTY
WILL EXPIRE AT 630 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern North Dakota.

Remember, a Severe Thunderstorm Warning still remains in effect for
southeast Benson County.

LAT...LON 4805 9938 4785 9952 4785 9981 4802 9981
      4802 9985 4808 9985
TIME...MOT...LOC 2320Z 238DEG 34KT 4796 9916 

$$

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, 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
Aug 9, 6:59 PM CDT	Severe Thunderstorm Warning Destructive damage threat	FGF	Eddy	31 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.