Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 63, NWS Grand Forks, ND

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

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 24, 2021, 1:51 AM CDT for Otter Tail County, Wadena County, Minnesota. It was in force for 39 min. 4 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, 1:51 AM CDT (06:51 UTC)
Expired: Jul 24, 2021, 2:30 AM CDT
In force: 39 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Otter Tail County, MN, Wadena County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 207 km from the middle of the area, began a volume at 06:54 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, 1:55 AM CDT	TSTM WND DMG	4 S Perham, MN	CORN FIELDS SNAPPED AND FLATTENED BY WIND AND HAIL.
Jul 24, 2:03 AM CDT	TSTM WND DMG	4 Ese Ottertail, MN	LARGE TREE BRANCHES WERE BROKEN DOWN AND AN AWNING SUPPORT WAS SNAPPED AROUND THE LEAF LAKE AREA IN CENTRAL LEAF LAKE TOWNSHIP. TIME ESTIMATED BASED ON RADAR.
Jul 24, 2:06 AM CDT	TSTM WND DMG	New York Mills, MN	LARGE TREE BRANCHES BROKEN DOWN. POWER OUTAGES. TIME ESTIMATED BASED ON RADAR.
Jul 24, 2:18 AM CDT	TSTM WND DMG	2 Sse Wadena, MN	SEVERAL LARGE TREE BRANCHES AND LIMBS WERE BROKEN DOWN. WINDS ESTIMATED IN EXCESS OF 60 MPH. TIME ESTIMATED BASED ON RADAR. WIDESPREAD POWER OUTAGES REPORTED.

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, 6.9 hours before the alert went out and 214 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.

259 
WUUS53 KFGF 240651
SVRFGF
MNC111-159-240730-
/O.NEW.KFGF.SV.W.0063.210724T0651Z-210724T0730Z/

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

The National Weather Service in Grand Forks has issued a

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

* Until 230 AM CDT.

* At 151 AM CDT, a severe thunderstorm was located over Perham, or 19
  miles southeast of Detroit Lakes, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  New York Mills around 205 AM CDT.

Other locations in the path of this severe thunderstorm include
Hillview, Bluffton, Sebeka, Blue Grass and Nimrod.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4637 9477 4641 9597 4668 9588 4669 9479
      4656 9478 4639 9478 4639 9477
TIME...MOT...LOC 0651Z 270DEG 40KT 4659 9562 

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

Riddle

2 follow-up statements

035 
WWUS53 KFGF 240718
SVSFGF

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

MNC111-159-240730-
/O.CON.KFGF.SV.W.0063.000000T0000Z-210724T0730Z/
Wadena MN-Otter Tail MN-
218 AM CDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR WADENA AND NORTHEASTERN OTTER TAIL COUNTIES...

At 218 AM CDT, a severe thunderstorm was located near Sebeka, or 35
miles southeast of Detroit Lakes, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Sebeka, Blue Grass, Nimrod and Oylen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4637 9477 4641 9597 4668 9588 4669 9479
      4656 9478 4639 9478 4639 9477
TIME...MOT...LOC 0718Z 270DEG 40KT 4659 9517 

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

Riddle

658 
WWUS53 KFGF 240728
SVSFGF

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

MNC111-159-240738-
/O.EXP.KFGF.SV.W.0063.000000T0000Z-210724T0730Z/
Wadena MN-Otter Tail MN-
228 AM CDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR WADENA AND NORTHEASTERN OTTER
TAIL COUNTIES WILL EXPIRE AT 230 AM CDT...
                
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 will be allowed to expire.

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

LAT...LON 4637 9477 4641 9597 4668 9588 4669 9479
      4656 9478 4639 9478 4639 9477
TIME...MOT...LOC 0728Z 270DEG 40KT 4659 9501 

$$

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, 1:34 AM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail	41 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.