Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 59, NWS Grand Forks, ND

July 24, 2021Grant County, Otter Tail County, Wilkin County, Minnesota; Richland County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 24, 2021, 12:41 AM CDT for Grant County, Otter Tail County, Wilkin County, Minnesota; Richland County, North Dakota. It was in force for 49 min. 8 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 24, 2021, 12:41 AM CDT (05:41 UTC)
Expired: Jul 24, 2021, 1:30 AM CDT
In force: 49 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Grant County, MN, Otter Tail County, MN, Wilkin County, MN, Richland County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 173 km from the middle of the area, began a volume at 05:41 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 24, 12:50 AM CDT	TSTM WND GST 57	2 W Tenney, MN	PEAK WIND MEASURED AT A MNDOT RWIS STATION.
Jul 24, 12:50 AM CDT	TSTM WND GST 57	Tenney, MN	MEASURED AT MN RWIS STATION.
Jul 24, 12:55 AM CDT	TSTM WND DMG	2 N Wendell, MN	LARGE BRANCHES BROKEN DOWN AND A TREE SNAPPED. TIME ESTIMATED BASED ON RADAR.
Jul 24, 1:30 AM CDT	TSTM WND DMG	Fergus Falls, MN	LARGE 3 INCH DIAMETER AND LARGER BRANCHES BROKEN DOWN. WINDS ESTIMATED TO 60 MPH.
Jul 24, 1:30 AM CDT	TSTM WND GST 60	Fergus Falls, MN	3 INCH TREE LIMBS DOWN.
Jul 24, 1:36 AM CDT	TSTM WND DMG	Dalton, MN	6 BRANCH DOWN; MOSTLY SMALLER BRANCHES ALSO BROKEN DOWN.
Jul 24, 1:36 AM CDT	TSTM WND DMG	Dalton, MN	BRANCHES UP TO 6 INCH DIAMETER BROKEN DOWN.
Jul 24, 1:39 AM CDT	TSTM WND DMG	Fergus Falls, MN	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 23, 11:22 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 23, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.7 hours before the alert went out and 209 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: 3002 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

025 
WUUS53 KFGF 240541
SVRFGF
MNC051-111-167-NDC077-240630-
/O.NEW.KFGF.SV.W.0059.210724T0541Z-210724T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
1241 AM CDT Sat Jul 24 2021

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southwestern Otter Tail County in west central Minnesota...
  Northwestern Grant County in west central Minnesota...
  Southeastern Wilkin County in west central Minnesota...
  Southeastern Richland County in southeastern North Dakota...

* Until 130 AM CDT.

* At 1241 AM CDT, a severe thunderstorm was located near Foxhome, or
  13 miles southwest of Fergus Falls, moving east at 40 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Western around 1250 AM CDT.
  Fergus Falls around 100 AM CDT.

Other locations in the path of this severe thunderstorm include
Dalton, Ashby and Underwood.

This includes Interstate 94 in Minnesota between mile markers 52 and
73.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4627 9669 4636 9573 4610 9578 4602 9626
      4602 9657 4596 9657 4595 9664
TIME...MOT...LOC 0541Z 272DEG 37KT 4620 9633 

HAIL...1.25IN
WIND...60MPH
 
$$

Riddle

1 follow-up statement

039 
WWUS53 KFGF 240609
SVSFGF

Severe Weather Statement
National Weather Service Grand Forks ND
109 AM CDT Sat Jul 24 2021

NDC077-240619-
/O.CAN.KFGF.SV.W.0059.000000T0000Z-210724T0630Z/
Richland ND-
109 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RICHLAND COUNTY
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 500 AM CDT for
west central Minnesota.

LAT...LON 4629 9647 4636 9573 4610 9578 4602 9626
      4602 9652
TIME...MOT...LOC 0609Z 272DEG 37KT 4619 9591 

$$

MNC051-111-167-240630-
/O.CON.KFGF.SV.W.0059.000000T0000Z-210724T0630Z/
Otter Tail MN-Grant MN-Wilkin MN-
109 AM CDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR SOUTHWESTERN OTTER TAIL...NORTHWESTERN GRANT AND SOUTHEASTERN
WILKIN COUNTIES...

At 109 AM CDT, a severe thunderstorm was located over Dalton, or 10
miles southeast of Fergus 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...
  Underwood and Ashby.

This includes Interstate 94 in Minnesota between mile markers 52 and
73.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4629 9647 4636 9573 4610 9578 4602 9626
      4602 9652
TIME...MOT...LOC 0609Z 272DEG 37KT 4619 9591 

HAIL...1.00IN
WIND...60MPH
 
$$

Riddle

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 11:50 PM CDT	Special Weather Statement	FGF	Wilkin	55 min
Jul 24, 12:58 AM CDT	Severe Thunderstorm Warning	FGF	Grant	47 min
Jul 24, 1:05 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Otter Tail	40 min
Jul 24, 1:34 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	41 min
Jul 24, 1:51 AM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	39 min
Jul 24, 2:32 AM CDT	Special Weather Statement	FGF	Hubbard	58 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.