Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 101, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 2021, 6:37 PM CDT for Eddy County, Nelson County, North Dakota. It was in force for 40 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, 6:37 PM CDT (23:37 UTC)
- Expired
- Aug 22, 2021, 7:17 PM CDT
- In force
- 40 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Eddy County, ND, Nelson County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 92 km from the middle of the area, began a volume at 23:36 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, 6:45 PM CDT | HAIL 1 | 4 Wsw Pekin, ND | PEA SIZE TO QUARTER SIZE HAIL. |
| Aug 22, 6:45 PM CDT | HAIL 1 | 4 Wsw Pekin, ND | PEA TO QUARTER 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 22, 3:36 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.6 hours before the alert went out and 200 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
- 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
The text
As transmitted.
581
WUUS53 KFGF 222337
SVRFGF
NDC027-063-230030-
/O.NEW.KFGF.SV.W.0101.210822T2337Z-210823T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
637 PM CDT Sun Aug 22 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Southwestern Nelson County in northeastern North Dakota...
Southeastern Eddy County in northeastern North Dakota...
* Until 730 PM CDT.
* At 637 PM CDT, a severe thunderstorm was located 9 miles south of
Hamar, or 29 miles southeast of Devils Lake, moving northeast at 25
mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Tolna and Pekin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4785 9855 4785 9853 4786 9853 4794 9838
4783 9809 4767 9847 4767 9850 4766 9850
4761 9862 4771 9880
TIME...MOT...LOC 2337Z 240DEG 23KT 4771 9863
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DJR3 follow-up statements
621
WWUS53 KFGF 222352
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
652 PM CDT Sun Aug 22 2021
NDC027-063-230030-
/O.CON.KFGF.SV.W.0101.000000T0000Z-210823T0030Z/
Nelson ND-Eddy ND-
652 PM CDT Sun Aug 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR SOUTHWESTERN NELSON AND EAST CENTRAL EDDY COUNTIES...
At 651 PM CDT, a severe thunderstorm was located near Pekin, or 33
miles southeast of Devils Lake, moving east at 40 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Tolna and Pekin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4794 9838 4783 9809 4767 9847 4767 9857
4774 9869 4785 9851
TIME...MOT...LOC 2351Z 249DEG 35KT 4776 9838
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DJR379
WWUS53 KFGF 230003
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
703 PM CDT Sun Aug 22 2021
NDC027-230013-
/O.CAN.KFGF.SV.W.0101.000000T0000Z-210823T0030Z/
Eddy ND-
703 PM CDT Sun Aug 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL 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 900 PM CDT for
northeastern North Dakota.
LAT...LON 4782 9848 4792 9832 4783 9809 4770 9842
TIME...MOT...LOC 0003Z 240DEG 23KT 4780 9828
$$
NDC063-230030-
/O.CON.KFGF.SV.W.0101.000000T0000Z-210823T0030Z/
Nelson ND-
703 PM CDT Sun Aug 22 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR SOUTHWESTERN NELSON COUNTY...
At 703 PM CDT, a severe thunderstorm was located over Pekin, or 35
miles southeast of Devils Lake, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Tolna and Pekin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4782 9848 4792 9832 4783 9809 4770 9842
TIME...MOT...LOC 0003Z 240DEG 23KT 4780 9828
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DJR617
WWUS53 KFGF 230017
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
717 PM CDT Sun Aug 22 2021
NDC063-230027-
/O.CAN.KFGF.SV.W.0101.000000T0000Z-210823T0030Z/
Nelson ND-
717 PM CDT Sun Aug 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NELSON COUNTY IS
CANCELLED...
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 has been cancelled. However small hail is
still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern North Dakota.
LAT...LON 4782 9848 4792 9832 4783 9809 4770 9842
TIME...MOT...LOC 0015Z 240DEG 23KT 4785 9816
$$
DJRThe 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, 4:19 PM CDT | Severe Thunderstorm Warning | FGF | Benson | 41 min |
| Aug 22, 4:25 PM CDT | Tornado Warning | FGF | Benson | 35 min |
| Aug 22, 5:58 PM CDT | Severe Thunderstorm Warning | FGF | Eddy | 47 min |
| Aug 22, 6:48 PM CDT | Severe Thunderstorm Warning | FGF | Griggs | 57 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.