Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 62, NWS Grand Forks, ND

July 24, 2021Grant County, Otter Tail County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 24, 2021, 1:34 AM CDT for Grant County, Otter Tail County, Minnesota. It was in force for 41 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: Jul 24, 2021, 1:34 AM CDT (06:34 UTC)
Expired: Jul 24, 2021, 2:15 AM CDT
In force: 41 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grant County, MN, Otter Tail County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 188 km from the middle of the area, began a volume at 06:37 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, 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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.6 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.

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: 2540 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1098 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.4

Open this sounding in Storm Lab

The text

As transmitted.

601 
WUUS53 KFGF 240634
SVRFGF
MNC051-111-240715-
/O.NEW.KFGF.SV.W.0062.210724T0634Z-210724T0715Z/

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

The National Weather Service in Grand Forks has issued a

* Severe Thunderstorm Warning for...
  Southern Otter Tail County in west central Minnesota...
  Northeastern Grant County in west central Minnesota...

* Until 215 AM CDT.

* At 133 AM CDT, a severe thunderstorm was located near Underwood, or
  11 miles east of Fergus Falls, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Battle Lake around 140 AM CDT.
  Clitherall around 145 AM CDT.
  Vining around 150 AM CDT.

Other locations in the path of this severe thunderstorm include
Urbank, Henning and Almora.

This includes Interstate 94 in Minnesota between mile markers 50 and
74.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4641 9615 4639 9516 4611 9515 4611 9577
      4607 9577 4604 9613
TIME...MOT...LOC 0633Z 270DEG 45KT 4622 9585 

HAIL...<.75IN
WIND...60MPH
 
$$

Riddle

2 follow-up statements

575 
WWUS53 KFGF 240656
SVSFGF

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

MNC051-240705-
/O.CAN.KFGF.SV.W.0062.000000T0000Z-210724T0715Z/
Grant MN-
156 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRANT COUNTY IS
CANCELLED...
    
The severe thunderstorm whiched 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 4640 9595 4639 9516 4611 9515 4611 9597
TIME...MOT...LOC 0655Z 268DEG 38KT 4622 9550 

$$

MNC111-240715-
/O.CON.KFGF.SV.W.0062.000000T0000Z-210724T0715Z/
Otter Tail MN-
156 AM CDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM CDT
FOR SOUTHEASTERN OTTER TAIL COUNTY...

At 155 AM CDT, a severe thunderstorm was located near Vining, or 27
miles east of Fergus Falls, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Almora, Parkers Prairie and Wrightstown.

This includes Interstate 94 in Minnesota between mile markers 66 and
70.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4640 9595 4639 9516 4611 9515 4611 9597
TIME...MOT...LOC 0655Z 268DEG 38KT 4622 9550 

HAIL...<.75IN
WIND...60MPH
 
$$

Riddle

289 
WWUS53 KFGF 240714
SVSFGF

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

MNC111-240724-
/O.EXP.KFGF.SV.W.0062.000000T0000Z-210724T0715Z/
Otter Tail MN-
214 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OTTER TAIL COUNTY
WILL EXPIRE AT 215 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
west central Minnesota.

LAT...LON 4640 9595 4639 9516 4611 9515 4611 9597
TIME...MOT...LOC 0714Z 270DEG 45KT 4622 9518 

$$

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, 12:41 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	49 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, 1:51 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 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.