Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 121, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Oct 8, 2021, 6:21 PM CDT for 4 counties in Minnesota. It was in force for 32 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
- Oct 8, 2021, 6:21 PM CDT (23:21 UTC)
- Expired
- Oct 8, 2021, 6:53 PM CDT
- In force
- 32 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Beltrami County, MN, Lake of the Woods County, MN, Marshall County, MN, Roseau County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 174 km from the middle of the area, began a volume at 23:22 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 nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 11.4 hours before the alert went out and 167 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
- 17 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
407
WUUS53 KFGF 082321
SVRFGF
MNC007-077-089-135-090015-
/O.NEW.KFGF.SV.W.0121.211008T2321Z-211009T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
621 PM CDT Fri Oct 8 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Northeastern Marshall County in northwestern Minnesota...
Southeastern Roseau County in northwestern Minnesota...
Northwestern Beltrami County in north central Minnesota...
Southwestern Lake of the Woods County in north central Minnesota...
* Until 715 PM CDT.
* At 621 PM CDT, a severe thunderstorm was located over Casperson, or
20 miles south of Roseau, moving east at 15 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.
* This severe thunderstorm will be near...
Skime around 635 PM CDT.
Other locations in the path of this severe thunderstorm include Hayes
Lake State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4849 9578 4860 9586 4880 9531 4849 9515
TIME...MOT...LOC 2321Z 255DEG 14KT 4855 9570
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Perroux1 follow-up statement
438
WWUS53 KFGF 082353
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
653 PM CDT Fri Oct 8 2021
MNC007-077-089-135-090003-
/O.CAN.KFGF.SV.W.0121.000000T0000Z-211009T0015Z/
Marshall MN-Roseau MN-Beltrami MN-Lake of the Woods MN-
653 PM CDT Fri Oct 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MARSHALL...
SOUTHEASTERN ROSEAU...NORTHWESTERN BELTRAMI AND SOUTHWESTERN LAKE OF
THE WOODS COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 4849 9578 4860 9586 4880 9531 4849 9515
TIME...MOT...LOC 2351Z 255DEG 14KT 4858 9552
$$
PerrouxThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 8, 5:12 PM CDT | Special Weather Statement | FGF | Polk | 33 min |
| Oct 8, 5:16 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 59 min |
| Oct 8, 5:26 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 52 min |
| Oct 8, 5:31 PM CDT | Special Weather Statement | FGF | Marshall | 29 min |
| Oct 8, 5:41 PM CDT | Special Weather Statement | FGF | Roseau | 34 min |
| Oct 8, 6:04 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 56 min |
| Oct 8, 6:06 PM CDT | Special Weather Statement | FGF | Norman | 24 min |
| Oct 8, 6:17 PM CDT | Special Weather Statement | FGF | Polk | 28 min |
| Oct 8, 6:30 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 37 min |
| Oct 8, 6:49 PM CDT | Special Weather Statement | FGF | Red Lake | 26 min |
| Oct 8, 6:59 PM CDT | Special Weather Statement | FGF | Norman | 31 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.