Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Grand Forks, ND

September 15, 2021Polk County, Minnesota; Traill County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 15, 2021, 11:45 PM CDT for Polk County, Minnesota; Traill County, North Dakota. It was in force for 60 min. 3 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 15, 2021, 11:45 PM CDT (04:45 UTC)
Expired: Sep 16, 2021, 12:45 AM CDT
In force: 60 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Polk County, MN, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 40 km from the middle of the area, began a volume at 04:44 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 15, 11:55 PM CDT	HAIL 1	1 Ne Climax, MN	PEA SIZED HAIL IN SMALLL DRIFTS. A FEW AS LARGE AS A QUARTER TOWARDS THE END.
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, 4.8 hours before the alert went out and 281 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

124 
WUUS53 KFGF 160445
SVRFGF
MNC119-NDC097-160545-
/O.NEW.KFGF.SV.W.0115.210916T0445Z-210916T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1145 PM CDT Wed Sep 15 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Polk County in northwestern Minnesota...
  Northeastern Traill County in southeastern North Dakota...

* Until 1245 AM CDT.

* At 1145 PM CDT, a severe thunderstorm was located near Climax, or
  21 miles south of Grand Forks, moving east at 40 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...
  Climax and Nielsville around 1150 PM CDT.
  Eldred around 1155 PM CDT.

Other locations in the path of this severe thunderstorm include
Greenview, Beltrami, Harold and Melvin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4750 9688 4761 9704 4767 9697 4767 9690
      4768 9690 4769 9691 4770 9688 4779 9641
      4750 9635
TIME...MOT...LOC 0445Z 261DEG 34KT 4761 9691 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lynch

1 follow-up statement

894 
WWUS53 KFGF 160456
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1156 PM CDT Wed Sep 15 2021

NDC097-160505-
/O.CAN.KFGF.SV.W.0115.000000T0000Z-210916T0545Z/
Traill ND-
1156 PM CDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TRAILL COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4750 9670 4761 9685 4769 9690 4770 9688
      4779 9641 4750 9635
TIME...MOT...LOC 0455Z 261DEG 34KT 4763 9677 

$$

MNC119-160545-
/O.CON.KFGF.SV.W.0115.000000T0000Z-210916T0545Z/
Polk MN-
1156 PM CDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHWESTERN POLK COUNTY...

At 1155 PM CDT, a severe thunderstorm was located over Climax, or 23
miles southeast of Grand Forks, moving east at 40 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...
  Greenview, Beltrami, Harold and Melvin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4750 9670 4761 9685 4769 9690 4770 9688
      4779 9641 4750 9635
TIME...MOT...LOC 0455Z 261DEG 34KT 4763 9677 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Lynch

The 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 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, 12:42 AM CDT	Severe Thunderstorm Warning	FGF	Polk, Red Lake	33 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
Sep 15, 8:52 PM CDT	Special Weather Statement	FGF	Cavalier	38 min
Sep 15, 9:31 PM CDT	Special Weather Statement	FGF	Walsh	59 min
Sep 15, 9:33 PM CDT	Special Weather Statement	FGF	Nelson	57 min
Sep 15, 9:42 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	63 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 Severe Thunderstorm Warnings in North Dakota, 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.