Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Grand Forks, ND

August 9, 2021Benson County, Cavalier County, Towner County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2021, 6:12 PM CDT for Benson County, Cavalier County, Towner County, North Dakota. It was in force for 63 min. 1 report 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, 6:12 PM CDT (23:12 UTC)
Expired: Aug 9, 2021, 7:15 PM CDT
In force: 63 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Benson County, ND, Cavalier County, ND, Towner County, ND

The radar

The Minot AFB radar (KMBX), 124 km from the middle of the area, began a volume at 23:12 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, 6:25 PM CDT	HAIL 1	8 W Cando, ND	DIME TO QUARTER SIZED HAIL REPORTED ACROSS SOUTHEASTERN ZION TOWNSHIP. NEARLY COVERED THE GROUND.

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, 11.2 hours before the alert went out and 223 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.

364 
WUUS53 KFGF 092312
SVRFGF
NDC005-019-095-100015-
/O.NEW.KFGF.SV.W.0081.210809T2312Z-210810T0015Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  North central Benson County in northeastern North Dakota...
  Southern Towner County in northeastern North Dakota...
  Southwestern Cavalier County in northeastern North Dakota...

* Until 715 PM CDT.

* At 611 PM CDT, a severe thunderstorm was located 9 miles northeast
  of York, or 34 miles northwest of Devils Lake, moving northeast at
  30 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Considine, Cando, Arndt, Egeland, Calio, Clyde and Munich.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4837 9949 4855 9949 4888 9902 4861 9867
      4854 9885 4854 9897 4850 9897 4831 9946
      4837 9953
TIME...MOT...LOC 2311Z 231DEG 28KT 4843 9946 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lee

1 follow-up statement

991 
WWUS53 KFGF 092337
SVSFGF

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

NDC005-019-095-100015-
/O.CON.KFGF.SV.W.0081.000000T0000Z-210810T0015Z/
Benson ND-Towner ND-Cavalier ND-
637 PM CDT Mon Aug 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTH CENTRAL BENSON...SOUTHERN TOWNER AND SOUTHWESTERN CAVALIER
COUNTIES...

At 637 PM CDT, a severe thunderstorm was located over Cando, or 30
miles northwest of Devils Lake, moving northeast at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Cando, Munich, Bisbee, Clyde, Alsen, Egeland and Calio. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4888 9902 4861 9867 4854 9885 4854 9897
      4850 9897 4831 9946 4837 9953 4837 9949
      4855 9949
TIME...MOT...LOC 2337Z 237DEG 36KT 4849 9923 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lee

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, 6:56 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.