Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 99, NWS Grand Forks, ND

August 22, 2021Benson County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 2021, 4:19 PM CDT for Benson County, North Dakota. It was in force for 41 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 22, 2021, 4:19 PM CDT (21:19 UTC)
Expired: Aug 22, 2021, 5:00 PM CDT
In force: 41 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Benson County, ND

The radar

The Minot AFB radar (KMBX), 129 km from the middle of the area, began a volume at 21:20 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 22, 4:40 PM CDT	TSTM WND DMG	5 Wnw Maddock, ND	CORN BLOWN DOWN. LARGE BRANCHES BLOWN DOWN. REPORT POSTED VIA SOCIAL MEDIA. TIME ESTIMATED BASED ON RADAR.
Aug 22, 4:40 PM CDT	TSTM WND GST 60	5 Wnw Maddock, ND	CORN BLOWN DOWN. BRANCHES DOWN. REPORT POSTED VIA SOCIAL MEDIA. TIME ESTIMATED BASED ON RADAR.

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 22, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 9.3 hours before the alert went out and 183 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1536 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 311 m²/s²
0-3 km storm-relative helicity: 445 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

550 
WUUS53 KFGF 222119
SVRFGF
NDC005-222200-
/O.NEW.KFGF.SV.W.0099.210822T2119Z-210822T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
419 PM CDT Sun Aug 22 2021

The National Weather Service in Grand Forks has issued a

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

* Until 500 PM CDT.

* At 418 PM CDT, a severe thunderstorm was located over Harvey, or 52
  miles southwest of Devils Lake, moving northeast at 50 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...
  Maddock, Flora, Harlow, Brinsmade and Minnewaukan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Devils Lake, get away from the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4822 9985 4837 9935 4837 9924 4834 9920
      4815 9920 4811 9907 4802 9907 4805 9900
      4800 9899 4800 9893 4802 9892 4804 9886
      4797 9878 4795 9880 4796 9878 4791 9872
      4785 9902 4785 9981 4802 9981 4802 9985
TIME...MOT...LOC 2118Z 226DEG 43KT 4779 9989 

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

$$

CJ

2 follow-up statements

515 
WWUS53 KFGF 222140
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
440 PM CDT Sun Aug 22 2021

NDC005-222200-
/O.CON.KFGF.SV.W.0099.000000T0000Z-210822T2200Z/
Benson ND-
440 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR BENSON COUNTY...

At 440 PM CDT, a severe thunderstorm was located near Maddock, or 35
miles west of Devils Lake, moving northeast at 50 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...
Leeds, Maddock, Fort Totten, Minnewaukan, Oberon, Harlow and
Brinsmade.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Devils Lake, get away from the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4837 9935 4837 9924 4834 9920 4815 9920
      4811 9907 4802 9907 4805 9900 4800 9899
      4800 9893 4802 9892 4804 9886 4797 9878
      4795 9880 4796 9878 4791 9872 4785 9902
      4785 9981 4787 9981 4801 9966 4825 9974
TIME...MOT...LOC 2140Z 226DEG 43KT 4797 9961 

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

$$

CJ

044 
WWUS53 KFGF 222155
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
455 PM CDT Sun Aug 22 2021

NDC005-222204-
/O.EXP.KFGF.SV.W.0099.000000T0000Z-210822T2200Z/
Benson ND-
455 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR BENSON COUNTY WILL EXPIRE AT
500 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern North Dakota.

LAT...LON 4837 9935 4837 9924 4834 9920 4815 9920
      4811 9907 4802 9907 4805 9900 4800 9899
      4800 9893 4802 9892 4804 9886 4797 9878
      4795 9880 4796 9878 4791 9872 4785 9902
      4785 9981 4787 9981 4801 9966 4825 9974
TIME...MOT...LOC 2154Z 226DEG 43KT 4807 9946 

$$

CJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 10:01 AM CDT	Wind Advisory	FGF	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 11 more	10 hr
Aug 22, 4:25 PM CDT	Tornado Warning	FGF	Benson	35 min
Aug 22, 5:58 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FGF	Eddy	47 min
Aug 22, 6:37 PM CDT	Severe Thunderstorm Warning	FGF	Eddy, Nelson	40 min
Aug 22, 6:48 PM CDT	Severe Thunderstorm Warning	FGF	Griggs	57 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.