Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 80, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2021, 6:03 PM CDT for Benson County, Eddy County, North Dakota. It was in force for 57 min. 5 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, 6:03 PM CDT (23:03 UTC)
- Expired
- Aug 9, 2021, 7:00 PM CDT
- In force
- 57 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.75 in
- Wind
- 70.0 mph
Counties Benson County, ND, Eddy County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 133 km from the middle of the area, began a volume at 23:07 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, 6:21 PM CDT | HAIL 1.5 | 4 Ssw New Rockford, ND | |
| Aug 9, 6:46 PM CDT | TSTM WND DMG | 3 Nnw Brantford, ND | BROKEN WINDOWS FROM VERY STRONG WINDS AND HAIL AT LEAST QUARTER SIZED. |
| Aug 9, 6:46 PM CDT | TSTM WND DMG | 3 Nnw Brantford, ND | BROKEN WINDOWS FROM VERY STRONG WINDS AND HAIL AT LEAST QUARTER SIZED. TIME ESTIMATED FROM RADAR. |
| Aug 9, 6:46 PM CDT | TSTM WND DMG | 3 Wnw Brantford, ND | BROKEN WINDOWS FROM VERY STORNG WINDS AND HAIL AT LEAST QUARTER SIZED. TIME ESTIMATED FROM RADAR. |
| Aug 9, 7:01 PM CDT | HAIL 1.75 | 3 Ene Brantford, ND |
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, 11.1 hours before the alert went out and 170 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.
- 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
The text
As transmitted.
875
WUUS53 KFGF 092303
SVRFGF
NDC005-027-100000-
/O.NEW.KFGF.SV.W.0080.210809T2303Z-210810T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
603 PM CDT Mon Aug 9 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Southeastern Benson County in northeastern North Dakota...
Eddy County in northeastern North Dakota...
* Until 700 PM CDT.
* At 602 PM CDT, a severe thunderstorm was located near Bremen, or 38
miles southwest of Devils Lake, moving northeast at 30 mph.
HAZARD...Golf ball size 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.
* Locations impacted include...
New Rockford, Sheyenne and Tokio.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. 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 4800 9877 4797 9877 4795 9880 4759 9872
4759 9926 4767 9927 4768 9930 4785 9930
4785 9952
TIME...MOT...LOC 2302Z 246DEG 27KT 4771 9942
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
CJ3 follow-up statements
713
WWUS53 KFGF 092321
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
621 PM CDT Mon Aug 9 2021
NDC005-027-100000-
/O.CON.KFGF.SV.W.0080.000000T0000Z-210810T0000Z/
Benson ND-Eddy ND-
621 PM CDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN BENSON AND EDDY COUNTIES...
At 621 PM CDT, a severe thunderstorm was located near Sheyenne, or 28
miles southwest of Devils Lake, moving northeast at 30 mph.
HAZARD...70 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
New Rockford, Sheyenne, Tokio, Brantford and Spirit Lake Nation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.
&&
LAT...LON 4800 9877 4797 9877 4795 9880 4759 9872
4759 9926 4767 9927 4768 9930 4785 9930
TIME...MOT...LOC 2321Z 246DEG 27KT 4777 9922
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
CJ985
WWUS53 KFGF 092334
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
634 PM CDT Mon Aug 9 2021
NDC005-027-100000-
/O.CON.KFGF.SV.W.0080.000000T0000Z-210810T0000Z/
Benson ND-Eddy ND-
634 PM CDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN BENSON AND EDDY COUNTIES...
At 634 PM CDT, a severe thunderstorm was located over Sheyenne, or 23
miles southwest of Devils Lake, moving northeast at 30 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.
Locations impacted include...
New Rockford, Sheyenne, Tokio, Brantford and Spirit Lake Nation.
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 4800 9877 4797 9877 4795 9880 4759 9872
4759 9926 4767 9927 4768 9930 4769 9930
4787 9922
TIME...MOT...LOC 2334Z 246DEG 27KT 4781 9908
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
$$
CJ494
WWUS53 KFGF 092350
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
650 PM CDT Mon Aug 9 2021
NDC005-027-100000-
/O.CON.KFGF.SV.W.0080.000000T0000Z-210810T0000Z/
Benson ND-Eddy ND-
650 PM CDT Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN BENSON AND CENTRAL EDDY COUNTIES...
At 649 PM CDT, a severe thunderstorm was located over southwestern
Spirit Lake Nation, or 17 miles south of Devils Lake, moving
northeast at 30 mph.
THIS IS A DESTRUCTIVE STORM FOR SOUTHERN EDDY COUNTY.
HAZARD...Baseball size hail and 70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Tokio, Brantford and Spirit Lake Nation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.
&&
LAT...LON 4800 9877 4797 9877 4795 9880 4759 9872
4759 9909 4790 9910
TIME...MOT...LOC 2349Z 246DEG 27KT 4786 9893
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
CJThe 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 | FGF | Benson, Eddy | 52 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 | FGF | Eddy | 31 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2021Every 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.