Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Grand Forks, ND

July 25, 2021Grant County, Otter Tail County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 25, 2021, 10:26 PM CDT for Grant County, Otter Tail County, Minnesota. It was in force for 18 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: Jul 25, 2021, 10:26 PM CDT (03:26 UTC)
Expired: Jul 25, 2021, 10:44 PM CDT
In force: 18 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.25 in
Wind: 70.0 mph

Counties Grant County, MN, Otter Tail County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 191 km from the middle of the area, began a volume at 03:26 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
Jul 25, 10:30 PM CDT	HAIL 1.75	4 S Western, MN	GOLD BALL SIZE HAIL, SHORT DURATION, WITH SHINGELS DAMAGED.
Jul 25, 10:30 PM CDT	HAIL 1.75	4 S Western, MN	GOLF BALL SIZED HAIL, SHORT DURATION, WITH SHINGLES DAMAGED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.4 hours before the alert went out and 230 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2454 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

851 
WUUS53 KFGF 260326
SVRFGF
MNC051-111-260430-
/O.NEW.KFGF.SV.W.0067.210726T0326Z-210726T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1026 PM CDT Sun Jul 25 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Otter Tail County in west central Minnesota...
  Northern Grant County in west central Minnesota...

* Until 1130 PM CDT.

* At 1025 PM CDT, a severe thunderstorm was located near Nashua, or
  16 miles southwest of Fergus Falls, moving east at 30 mph.

  HAZARD...70 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* This severe thunderstorm will be near...
  Western around 1035 PM CDT.
  Wendell around 1040 PM CDT.

Other locations in the path of this severe thunderstorm include Elbow
Lake, Dalton, Ashby and Erdahl.

This includes Interstate 94 in Minnesota between mile markers 64 and
80.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4600 9627 4617 9627 4620 9573 4611 9572
      4611 9577 4596 9577
TIME...MOT...LOC 0325Z 268DEG 26KT 4609 9628 

HAIL...1.25IN
WIND...70MPH
 
$$

DJR

1 follow-up statement

381 
WWUS53 KFGF 260344
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
1044 PM CDT Sun Jul 25 2021

MNC051-111-260354-
/O.CAN.KFGF.SV.W.0067.000000T0000Z-210726T0430Z/
Otter Tail MN-Grant MN-
1044 PM CDT Sun Jul 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN OTTER TAIL AND
NORTHERN GRANT 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.  However small hail and
gusty winds 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 4600 9627 4617 9627 4620 9573 4611 9572
      4611 9577 4596 9577
TIME...MOT...LOC 0342Z 268DEG 26KT 4609 9608 

$$

DJR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 9:55 PM CDT	Severe Thunderstorm Warning	FGF	Wilkin	35 min
Jul 25, 10:43 PM CDT	Special Weather Statement	FGF	Grant	32 min
Jul 25, 10:46 PM CDT	Special Weather Statement	FGF	Grant	29 min
Jul 26, 4:23 PM CDT	Special Weather Statement	FGF	Beltrami	52 min
Jul 26, 4:30 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater	60 min
Jul 26, 5:13 PM CDT	Tornado Warning Tornado observed	FGF	Beltrami	47 min
Jul 26, 5:32 PM CDT	Tornado Warning	FGF	Beltrami	43 min
Jul 26, 6:23 PM CDT	Special Weather Statement	FGF	Hubbard	37 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.