Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 86, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2021, 8:08 PM CDT for Grand Forks County, Nelson County, North Dakota. It was in force for 27 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, 8:08 PM CDT (01:08 UTC)
- Expired
- Aug 9, 2021, 8:35 PM CDT
- In force
- 27 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Grand Forks County, ND, Nelson County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 75 km from the middle of the area, began a volume at 01:07 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, 8:24 PM CDT | TSTM WND DMG | 4 N Mcville, ND | SEVERAL LARGE 4-6 INCH TREE BRANCHES BROKEN DOWN AROUND A FARMSTEAD. |
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 00:00Z, 1.1 hours before the alert went out and 237 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
- 296 J/kg
- Mixed-layer CIN
- -462 J/kg
- Mixed-layer LCL
- 1238 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- -40 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
234
WUUS53 KFGF 100108
SVRFGF
NDC035-063-100215-
/O.NEW.KFGF.SV.W.0086.210810T0108Z-210810T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
808 PM CDT Mon Aug 9 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Northwestern Grand Forks County in northeastern North Dakota...
Southeastern Nelson County in northeastern North Dakota...
* Until 915 PM CDT.
* At 808 PM CDT, a severe thunderstorm was located near Pekin, or 35
miles southeast of Devils Lake, moving northeast at 30 mph.
HAZARD...Ping pong 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...
Petersburg, Niagara and McCanna.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4786 9842 4819 9800 4819 9771 4789 9768
4776 9831
TIME...MOT...LOC 0108Z 238DEG 25KT 4783 9825
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CJ1 follow-up statement
369
WWUS53 KFGF 100135
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
835 PM CDT Mon Aug 9 2021
NDC035-063-100144-
/O.CAN.KFGF.SV.W.0086.000000T0000Z-210810T0215Z/
Grand Forks ND-Nelson ND-
835 PM CDT Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRAND FORKS AND
SOUTHEASTERN NELSON COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern North Dakota.
Remember, a Tornado Warning and Severe Thunderstorm Warning still
remains in effect for southern Nelson County.
LAT...LON 4786 9842 4819 9800 4819 9771 4789 9768
4776 9831
TIME...MOT...LOC 0133Z 238DEG 25KT 4793 9802
$$
CJThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 7:04 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Ramsey, Towner | 56 min |
| Aug 9, 7:11 PM CDT | Tornado Warning | FGF | Cavalier, Ramsey, Towner | 34 min |
| Aug 9, 7:29 PM CDT | Severe Thunderstorm Warning | FGF | Eddy, Griggs, Nelson | 46 min |
| Aug 9, 7:57 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina, Ramsey, Walsh | 63 min |
| Aug 9, 8:12 PM CDT | Severe Thunderstorm Warning | FGF | Eddy, Griggs, Nelson | 63 min |
| Aug 9, 8:28 PM CDT | Tornado Warning | FGF | Griggs, Nelson | 32 min |
| Aug 9, 8:52 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 38 min |
| Aug 9, 9:09 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Griggs, Nelson, Steele | 66 min |
| Aug 9, 9:20 PM CDT | Tornado Warning | FGF | Grand Forks, Nelson, Steele | 40 min |
| Aug 9, 9:42 PM CDT | Tornado Warning | FGF | Grand Forks | 48 min |
| Aug 9, 9:54 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Steele | 66 min |
| Aug 9, 10:08 PM CDT | Special Weather Statement | FGF | Pembina | 52 min |
| Aug 9, 10:30 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Steele, Traill | 30 min |
| Aug 9, 10:42 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Traill | 63 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.