Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 116, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 16, 2021, 12:42 AM CDT for Polk County, Red Lake County, Minnesota. It was in force for 33 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
- Sep 16, 2021, 12:42 AM CDT (05:42 UTC)
- Expired
- Sep 16, 2021, 1:15 AM CDT
- In force
- 33 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Polk County, MN, Red Lake County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 94 km from the middle of the area, began a volume at 05:44 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 |
|---|---|---|---|
| Sep 16, 12:42 AM CDT | HAIL 1 | 2 Sse Gentilly, MN | PUBLIC REPORT OF HAIL ESTIMATED TO BE AROUND QUARTER SIZED, POSSIBLY UP TO GOLF BALL SIZED BUT COULD NOT CONFIRM. |
| Sep 16, 12:42 AM CDT | HAIL 1 | 2 Sse Gentilly, MN | REPORT OF HAIL TO BE AROUND QUARTER SIZED, POSSIBLY UP TO GOLF BALL SIZED BUT COULD NOT CONFIRM. |
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 00:00Z, 5.7 hours before the alert went out and 227 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
- 6 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 1751 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
196
WUUS53 KFGF 160542
SVRFGF
MNC119-125-160615-
/O.NEW.KFGF.SV.W.0116.210916T0542Z-210916T0615Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1242 AM CDT Thu Sep 16 2021
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Southeastern Red Lake County in northwestern Minnesota...
East central Polk County in northwestern Minnesota...
* Until 115 AM CDT.
* At 1241 AM CDT, a severe thunderstorm was located near Marcoux, or
26 miles south of Thief River Falls, moving east at 55 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...
Marcoux, Perault and Dugdale around 1245 AM CDT.
Mentor around 1250 AM CDT.
Terrebonne around 1255 AM CDT.
Brooks and Plummer around 100 AM CDT.
Other locations in the path of this severe thunderstorm include
Oklee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4773 9577 4766 9637 4772 9647 4782 9644
4797 9591
TIME...MOT...LOC 0541Z 249DEG 47KT 4775 9635
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Lynch1 follow-up statement
966
WWUS53 KFGF 160558
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
1258 AM CDT Thu Sep 16 2021
MNC119-125-160615-
/O.CON.KFGF.SV.W.0116.000000T0000Z-210916T0615Z/
Red Lake MN-Polk MN-
1258 AM CDT Thu Sep 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM CDT
FOR CENTRAL RED LAKE AND EAST CENTRAL POLK COUNTIES...
At 1258 AM CDT, a severe thunderstorm was located near Terrebonne, or
22 miles south of Thief River Falls, moving east at 45 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Brooks, Plummer and Oklee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4773 9577 4769 9614 4777 9624 4789 9620
4797 9591
TIME...MOT...LOC 0558Z 251DEG 38KT 4780 9609
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
LynchThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 10:38 PM CDT | Severe Thunderstorm Warning | FGF | Kittson, Marshall | 52 min |
| Sep 15, 10:47 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Polk | 43 min |
| Sep 15, 11:25 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Pennington, Polk | 50 min |
| Sep 15, 11:27 PM CDT | Special Weather Statement | FGF | Marshall | 48 min |
| Sep 15, 11:45 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 60 min |
| Sep 16, 12:14 AM CDT | Special Weather Statement | FGF | Pennington | 46 min |
| Sep 16, 12:22 AM CDT | Special Weather Statement | FGF | Polk, Red Lake | 38 min |
| Sep 16, 1:13 AM CDT | Special Weather Statement | FGF | Red Lake | 32 min |
| Sep 16, 1:23 AM CDT | Special Weather Statement | FGF | Mahnomen | 37 min |
| Sep 16, 1:51 AM CDT | Special Weather Statement | FGF | Beltrami, Clearwater | 54 min |
| Sep 16, 1:59 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater, Hubbard, Mahnomen, Polk | 49 min |
| Sep 16, 2:44 AM CDT | Special Weather Statement | FGF | Hubbard | 46 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.