Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 107, NWS Grand Forks, ND

September 6, 2021Beltrami County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 6, 2021, 9:17 PM CDT for Beltrami County, Minnesota. It was in force for 18 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: Sep 6, 2021, 9:17 PM CDT (02:17 UTC)
Expired: Sep 6, 2021, 9:35 PM CDT
In force: 18 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Beltrami County, MN

The radar

The Duluth radar (KDLH), 204 km from the middle of the area, began a volume at 02:18 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 6, 9:20 PM CDT	HAIL 1	1 S Blackduck, MN	NUMEROUS DIME TO NICKLE SIZED HAIL AND A FEW QUARTER SIZED HAIL, ALONG WITH BRIEF HEAVY RAIN AND VERY STRONG WINDS.

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, 2.3 hours before the alert went out and 134 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 133 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1566 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 364 m²/s²
0-3 km storm-relative helicity: 441 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

106 
WUUS53 KFGF 070217
SVRFGF
MNC007-070245-
/O.NEW.KFGF.SV.W.0107.210907T0217Z-210907T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
917 PM CDT Mon Sep 6 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southeastern Beltrami County in north central Minnesota...

* Until 945 PM CDT.

* At 917 PM CDT, a severe thunderstorm was located over Blackduck, or
  23 miles northeast of Bemidji, moving east at 45 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Funkley around 925 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4764 9468 4781 9472 4786 9442 4766 9442
TIME...MOT...LOC 0217Z 265DEG 38KT 4774 9457 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BH

1 follow-up statement

515 
WWUS53 KFGF 070235
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
935 PM CDT Mon Sep 6 2021

MNC007-070244-
/O.CAN.KFGF.SV.W.0107.000000T0000Z-210907T0245Z/
Beltrami MN-
935 PM CDT Mon Sep 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BELTRAMI COUNTY
IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However small hail and heavy rain are still possible
with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Grand Forks.

LAT...LON 4764 9468 4781 9472 4786 9442 4766 9442
TIME...MOT...LOC 0232Z 265DEG 38KT 4776 9429 

$$

BH

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 6, 9:06 PM CDT	Special Weather Statement	FGF	Beltrami	24 min
Sep 6, 9:50 PM CDT	Severe Thunderstorm Warning	FGF	Mahnomen, Norman	20 min
Sep 6, 10:32 PM CDT	Special Weather Statement	FGF	Hubbard	43 min
Sep 6, 11:19 PM CDT	Special Weather Statement	FGF	Mahnomen	41 min
Sep 6, 11:30 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Mahnomen	45 min
Sep 7, 12:07 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Wadena	38 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Every 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.