Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 13, NWS Sioux Falls, SD

August 28, 2021Cottonwood County, Murray County, Minnesota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2021, 5:26 PM CDT for Cottonwood County, Murray County, Minnesota. It was in force for 34 min. 7 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, 5:26 PM CDT (22:26 UTC)
Expired: Aug 28, 2021, 6:00 PM CDT
In force: 34 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), 93 km from the middle of the area, began a volume at 22:30 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, 5:30 PM CDT	TSTM WND DMG	2 E Iona, MN	TREES SNAPPED BY WINDS.
Aug 28, 5:36 PM CDT	TSTM WND DMG	Avoca, MN	MACHINE SHED DAMAGED.
Aug 28, 5:44 PM CDT	TSTM WND GST 60	1 W Slayton, MN
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, 5:58 PM CDT	TSTM WND DMG	1 E Slayton, MN	REPORT VIA SOCIAL MEDIA OF TREE DAMAGE EAST OF SLAYTON.

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, 10.4 hours before the alert went out and 193 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.

072 
WFUS53 KFSD 282226
TORFSD
MNC033-101-282300-
/O.NEW.KFSD.TO.W.0013.210828T2226Z-210828T2300Z/

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

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Central Murray County in southwestern Minnesota...
  West central Cottonwood County in southwestern Minnesota...

* Until 600 PM CDT.
    
* At 526 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Chandler, or 7 miles west of Slayton, moving east
  at 55 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...
  Slayton around 535 PM CDT.
  Currie and Lake Shetek State Park around 540 PM CDT.
  Dovray around 545 PM CDT.
  Westbrook around 555 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Hadley, Avoca and Iona.

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.

&&

LAT...LON 4393 9536 4385 9591 4385 9596 4401 9603
      4416 9548
TIME...MOT...LOC 2226Z 252DEG 47KT 4395 9590 

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

$$

SG

1 follow-up statement

629 
WWUS53 KFSD 282236
SVSFSD

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

MNC033-101-282300-
/O.CON.KFSD.TO.W.0013.000000T0000Z-210828T2300Z/
Murray MN-Cottonwood MN-
536 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR EASTERN
MURRAY AND WEST CENTRAL COTTONWOOD COUNTIES...
    
At 536 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Slayton, moving east at 50 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...
  Currie and Lake Shetek State Park around 545 PM CDT.
  Dovray around 550 PM CDT.
  Westbrook around 555 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Hadley, Avoca and Iona.

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.

&&

LAT...LON 4386 9581 4404 9592 4416 9548 4393 9536
TIME...MOT...LOC 2236Z 249DEG 43KT 4399 9576 

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

$$

SG

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, 5:29 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, 5:43 PM CDT	Tornado Warning	FSD	Cottonwood, Murray	32 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.