Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 14, NWS Sioux Falls, SD

August 28, 2021Cottonwood County, Murray County, Minnesota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2021, 5:43 PM CDT for Cottonwood County, Murray County, Minnesota. It was in force for 32 min. 6 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: Aug 28, 2021, 5:43 PM CDT (22:43 UTC)
Expired: Aug 28, 2021, 6:15 PM CDT
In force: 32 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Cottonwood County, MN, Murray County, MN

The radar

The Sioux Falls radar (KFSD), 109 km from the middle of the area, began a volume at 22:43 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
Aug 28, 5:45 PM CDT	TSTM WND DMG	Avoca, MN	REPORT VIA SOCIAL MEDIA OF HEAVY TREE DAMAGE IN AVOCA.
Aug 28, 5:46 PM CDT	TSTM WND DMG	1 S Westbrook, MN	GRAIN BIN DAMAGED 1/2 MILE SOUTH OF WESTBROOK. DAMAGE ALSO TO OLD BARN 1 SOUTH OF WESTBROOK.
Aug 28, 5:50 PM CDT	TSTM WND DMG	Westbrook, MN	DAMAGE TO WESTBROOK LUMBER BUILDING. WIND GUSTS ESTIMATED AT 70 MPH.
Aug 28, 5:54 PM CDT	TSTM WND DMG	1 S Storden, MN	GRAIN BIN DAMAGE 1/2 MILE SOUTH OF STORDEN.
Aug 28, 5:58 PM CDT	TSTM WND DMG	1 E Slayton, MN	REPORT VIA SOCIAL MEDIA OF TREE DAMAGE EAST OF SLAYTON.
Aug 28, 6:16 PM CDT	TSTM WND DMG	4 S Westbrook, MN	NUMEROUS TREES DOWN AND LAYING ACROSS ROAD.

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
Aug 28, 3:44 PM CDT	Tornado Watch	SPC	5 hr
Aug 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.7 hours before the alert went out and 178 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: 1550 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 676 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

348 
WFUS53 KFSD 282243
TORFSD
MNC033-101-282315-
/O.NEW.KFSD.TO.W.0014.210828T2243Z-210828T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
543 PM CDT Sat Aug 28 2021

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Eastern Murray County in southwestern Minnesota...
  Northwestern Cottonwood County in southwestern Minnesota...

* Until 615 PM CDT.
    
* At 543 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Currie, or near Slayton, moving east at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Dovray around 555 PM CDT.
  Westbrook around 600 PM CDT.
  Storden around 605 PM CDT.

Other locations impacted by this tornadic thunderstorm include Avoca.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4390 9570 4409 9584 4420 9544 4420 9535
      4402 9520
TIME...MOT...LOC 2243Z 248DEG 41KT 4403 9571 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

SG

1 follow-up statement

688 
WWUS53 KFSD 282305
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
605 PM CDT Sat Aug 28 2021

MNC033-101-282315-
/O.CON.KFSD.TO.W.0014.000000T0000Z-210828T2315Z/
Murray MN-Cottonwood MN-
605 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
NORTHEASTERN MURRAY AND NORTHWESTERN COTTONWOOD COUNTIES...
    
At 605 PM CDT, a severe thunderstorm capable of producing a tornado 
was located north of Westbrook, or 20 miles northeast of Slayton, 
moving east at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Murray and northwestern Cottonwood Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4395 9548 4418 9552 4420 9544 4420 9535
      4402 9520
TIME...MOT...LOC 2305Z 248DEG 41KT 4412 9539 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Kalin

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 4:45 PM CDT	Tornado Warning	FSD	Rock	30 min
Aug 28, 4:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	41 min
Aug 28, 5:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	45 min
Aug 28, 5:06 PM CDT	Tornado Warning	FSD	Murray, Nobles, Pipestone, Rock	24 min
Aug 28, 5:24 PM CDT	Tornado Warning	FSD	Nobles	36 min
Aug 28, 5:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock	34 min
Aug 28, 5:26 PM CDT	Tornado Warning	FSD	Cottonwood, Murray	34 min
Aug 28, 5:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock	31 min
Aug 28, 5:34 PM CDT	Severe Thunderstorm Warning	FSD	Rock	17 min
Aug 28, 5:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles	45 min
Aug 28, 5:49 PM CDT	Tornado Warning	FSD	Cottonwood, Jackson, Murray, Nobles	26 min
Aug 28, 6:01 PM CDT	Tornado Warning	FSD	Cottonwood	30 min
Aug 28, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone, Rock	45 min
Aug 28, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	Rock	52 min

Nearby

Tornado Warnings in Minnesota, 2021 Every tornado warning in 2021 Tornadoes 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.