Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 95, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 20, 2021, 1:53 PM CDT for 5 counties in Minnesota. It was in force for 67 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 20, 2021, 1:53 PM CDT (18:53 UTC)
- Expired
- Aug 20, 2021, 3:00 PM CDT
- In force
- 67 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Beltrami County, MN, Clearwater County, MN, Lake of the Woods County, MN, Marshall County, MN, Pennington County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 161 km from the middle of the area, began a volume at 18:57 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 20, 1:55 PM CDT | TSTM WND DMG | 5 Ese High Landing, MN | TIN ROOF PANEL BLOWN OFF A SHED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 6.9 hours before the alert went out and 161 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
- 347 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 1086 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
286
WUUS53 KFGF 201853
SVRFGF
MNC007-029-077-089-113-202000-
/O.NEW.KFGF.SV.W.0095.210820T1853Z-210820T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
153 PM CDT Fri Aug 20 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Southeastern Marshall County in northwestern Minnesota...
Northern Beltrami County in north central Minnesota...
Eastern Pennington County in northwestern Minnesota...
Southwestern Lake of the Woods County in north central Minnesota...
Northwestern Clearwater County in northwestern Minnesota...
* Until 300 PM CDT.
* At 153 PM CDT, a severe thunderstorm was located 7 miles east of
Roland, or 27 miles east of Thief River Falls, moving northeast at
45 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Northwestern Red Lake Nation around 200 PM CDT.
Other locations in the path of this severe thunderstorm include
Jelle, Thorhult, Fourtown and Oaks Corner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
If on or near Upper and Lower Red Lakes, get away from the water and
move indoors or inside a vehicle. Remember, lightning can strike out
to 15 miles from the parent thunderstorm. If you can hear thunder,
you are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4784 9558 4793 9558 4794 9571 4796 9571
4797 9583 4814 9589 4854 9540 4854 9534
4859 9534 4871 9519 4847 9460 4803 9452
TIME...MOT...LOC 1853Z 227DEG 37KT 4799 9562
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CJ2 follow-up statements
333
WWUS53 KFGF 201926
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
226 PM CDT Fri Aug 20 2021
MNC089-113-201935-
/O.CAN.KFGF.SV.W.0095.000000T0000Z-210820T2000Z/
Marshall MN-Pennington MN-
226 PM CDT Fri Aug 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARSHALL AND
EASTERN PENNINGTON COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
north central and northwestern Minnesota.
LAT...LON 4791 9516 4802 9545 4838 9559 4854 9540
4854 9534 4859 9534 4871 9519 4847 9460
4803 9452
TIME...MOT...LOC 1925Z 227DEG 37KT 4822 9525
$$
MNC007-029-077-202000-
/O.CON.KFGF.SV.W.0095.000000T0000Z-210820T2000Z/
Beltrami MN-Lake of the Woods MN-Clearwater MN-
226 PM CDT Fri Aug 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR NORTHERN BELTRAMI...SOUTHWESTERN LAKE OF THE WOODS AND NORTH
CENTRAL CLEARWATER COUNTIES...
At 225 PM CDT, a severe thunderstorm was located over Thorhult, or 42
miles east of Thief River Falls, moving northeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Oaks Corner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near Upper and Lower Red Lakes, get away from the water and
move indoors or inside a vehicle. Remember, lightning can strike out
to 15 miles from the parent thunderstorm. If you can hear thunder,
you are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4791 9516 4802 9545 4838 9559 4854 9540
4854 9534 4859 9534 4871 9519 4847 9460
4803 9452
TIME...MOT...LOC 1925Z 227DEG 37KT 4822 9525
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CJ932
WWUS53 KFGF 201954
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
254 PM CDT Fri Aug 20 2021
MNC007-029-077-202003-
/O.EXP.KFGF.SV.W.0095.000000T0000Z-210820T2000Z/
Beltrami MN-Lake of the Woods MN-Clearwater MN-
254 PM CDT Fri Aug 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BELTRAMI...
SOUTHWESTERN LAKE OF THE WOODS AND NORTH CENTRAL CLEARWATER COUNTIES
WILL EXPIRE AT 300 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
north central and northwestern Minnesota.
LAT...LON 4791 9516 4802 9545 4838 9559 4854 9540
4854 9534 4859 9534 4871 9519 4847 9460
4803 9452
TIME...MOT...LOC 1953Z 227DEG 37KT 4840 9495
$$
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 | Marshall, Pennington, Polk, Red Lake | 28 min |
| Aug 20, 11:04 AM CDT | Areal Flood Advisory | FGF | Polk | 4 hr |
| Aug 20, 12:28 PM CDT | Special Weather Statement | FGF | Norman, Polk | 32 min |
| Aug 20, 1:02 PM CDT | Special Weather Statement | FGF | Pennington, Red Lake | 28 min |
| Aug 20, 1:09 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 51 min |
| Aug 20, 2:00 PM CDT | Special Weather Statement | FGF | Roseau | 60 min |
| Aug 20, 2:52 PM CDT | Special Weather Statement | FGF | Lake of the Woods | 53 min |
| Aug 20, 3:31 PM CDT | Special Weather Statement | FGF | Grant | 59 min |
| Aug 20, 4:12 PM CDT | Special Weather Statement | FGF | Wadena | 33 min |
| Aug 20, 4:19 PM CDT | Special Weather Statement | FGF | Beltrami | 26 min |
| Aug 20, 4:20 PM CDT | Special Weather Statement | FGF | Beltrami | 25 min |
| Aug 20, 4:22 PM CDT | Special Weather Statement | FGF | Clay | 53 min |
| Aug 20, 4:43 PM CDT | Special Weather Statement | FGF | Beltrami | 32 min |
| Aug 20, 4:49 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 26 min |
| Aug 20, 5:07 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wadena | 38 min |
| Aug 20, 5:13 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.