Alert archive / North Dakota / Tornado Warnings in 2021
Tornado Warning 8, NWS Grand Forks, ND
NWS Grand Forks, ND issued this tornado warning at Aug 20, 2021, 2:43 PM CDT for Barnes County, Cass County, North Dakota. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2021, 2:43 PM CDT (19:43 UTC)
- Expired
- Aug 20, 2021, 3:30 PM CDT
- In force
- 47 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Barnes County, ND, Cass County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 92 km from the middle of the area, began a volume at 19:45 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.
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 20, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 7.7 hours before the alert went out and 212 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
- 1019 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 682 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.2
The text
As transmitted.
464
WFUS53 KFGF 201943
TORFGF
NDC003-017-202030-
/O.NEW.KFGF.TO.W.0008.210820T1943Z-210820T2030Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Forks ND
243 PM CDT Fri Aug 20 2021
The National Weather Service in Grand Forks has issued a
* Tornado Warning for...
Southwestern Cass County in southeastern North Dakota...
Southeastern Barnes County in southeastern North Dakota...
* Until 330 PM CDT.
* At 243 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Lucca, or 21 miles southeast of Valley City,
moving northeast at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Lucca around 250 PM CDT.
Fingal around 255 PM CDT.
Other locations in the path of this tornadic thunderstorm include
Alice, Tower City and Buffalo.
This includes Interstate 94 in North Dakota between mile markers 303
and 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4665 9786 4700 9778 4688 9729 4663 9767
4663 9776
TIME...MOT...LOC 1943Z 210DEG 21KT 4668 9774
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
CJ2 follow-up statements
878
WWUS53 KFGF 202010
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
310 PM CDT Fri Aug 20 2021
NDC003-202018-
/O.CAN.KFGF.TO.W.0008.000000T0000Z-210820T2030Z/
Barnes ND-
310 PM CDT Fri Aug 20 2021
...THE TORNADO WARNING FOR SOUTHEASTERN BARNES COUNTY IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern North Dakota.
LAT...LON 4677 9768 4698 9768 4688 9729 4667 9760
TIME...MOT...LOC 2008Z 210DEG 21KT 4681 9763
$$
NDC017-202030-
/O.CON.KFGF.TO.W.0008.000000T0000Z-210820T2030Z/
Cass ND-
310 PM CDT Fri Aug 20 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR
SOUTHWESTERN CASS COUNTY...
At 308 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Alice, or 19 miles southeast of Valley City, moving
northeast at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation. At 2:34 PM CDT, numerous reports
of a rotating wall cloud have been reported near Enderlin
to near Alice.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Tower City and Buffalo.
This includes Interstate 94 in North Dakota between mile markers 308
and 327.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4677 9768 4698 9768 4688 9729 4667 9760
TIME...MOT...LOC 2008Z 210DEG 21KT 4681 9763
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
CJ660
WWUS53 KFGF 202025
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
325 PM CDT Fri Aug 20 2021
NDC017-202035-
/O.EXP.KFGF.TO.W.0008.000000T0000Z-210820T2030Z/
Cass ND-
325 PM CDT Fri Aug 20 2021
...THE TORNADO WARNING FOR SOUTHWESTERN CASS COUNTY WILL EXPIRE AT
330 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern North Dakota.
LAT...LON 4677 9768 4698 9768 4688 9729 4667 9760
TIME...MOT...LOC 2025Z 210DEG 21KT 4689 9756
$$
CJThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 9:47 AM CDT | Special Weather Statement | FGF | Grand Forks | 28 min |
| Aug 20, 11:04 AM CDT | Areal Flood Advisory | FGF | Grand Forks | 4 hr |
| Aug 20, 11:12 AM CDT | Special Weather Statement | FGF | Cass | 33 min |
| Aug 20, 3:24 PM CDT | Special Weather Statement | FGF | Cass | 36 min |
| Aug 20, 3:49 PM CDT | Special Weather Statement | FGF | Griggs | 56 min |
| Aug 20, 4:00 PM CDT | Special Weather Statement | FGF | Traill | 60 min |
| Aug 20, 4:11 PM CDT | Tornado Warning | FGF | Barnes, Griggs, Steele | 49 min |
| Aug 20, 4:13 PM CDT | Tornado Warning | FGF | Cass, Traill | 47 min |
| Aug 20, 4:49 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 26 min |
| Aug 20, 4:51 PM CDT | Special Weather Statement | FGF | Steele | 54 min |
| Aug 20, 5:11 PM CDT | Special Weather Statement | FGF | Ramsey | 49 min |
| Aug 20, 5:13 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Traill | 39 min |
| Aug 20, 6:24 PM CDT | Special Weather Statement | FGF | Walsh | 51 min |
Nearby
Tornado Warnings in North Dakota, 2021Every tornado warning in 2021Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.