Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 19, NWS Aberdeen, SD

October 9, 2021Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this tornado warning at Oct 9, 2021, 6:58 PM CDT for Big Stone County, Traverse County, Minnesota. It was in force for 21 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: Oct 9, 2021, 6:58 PM CDT (23:58 UTC)
Expired: Oct 9, 2021, 7:19 PM CDT
In force: 21 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Big Stone County, MN, Traverse County, MN

The radar

The Aberdeen radar (KABR), 139 km from the middle of the area, began a volume at 00:03 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
Oct 9, 7:15 PM CDT	TSTM WND DMG	2 Sw Dumont, MN	ESTIMATED WINDS OF 70-75 MPH CAUSED DAMAGE TO A BARN. THE WINDS DAMAGED A WALL, AND UNROOFED PART OF THE BARN. TIME ESTIMATED BASED ON RADAR.
Oct 9, 7:18 PM CDT	TSTM WND DMG	2 Sw Dumont, MN	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 SW DUMONT. ESTIMATED WINDS OF 70-75 MPH CAUSED DAMAGE TO A BARN. THE WINDS DAMAGED A WALL, AND UNROOFED PART OF THE BARN. TIME ESTIMATED BASED ON RADAR.
Oct 9, 7:18 PM CDT	TORNADO	2 Sw Dumont, MN	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 SW DUMONT. A TORNADO CAUSED DAMAGE TO A BARN. THE WINDS DAMAGED A WALL, AND UNROOFED PART OF THE BARN. TIME ESTIMATED BASED ON RADAR.

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
Oct 9, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 12.0 hours before the alert went out and 161 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: 4 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 713 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

234 
WFUS53 KABR 092358
TORABR
MNC011-155-100030-
/O.NEW.KABR.TO.W.0019.211009T2358Z-211010T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Aberdeen SD
658 PM CDT Sat Oct 9 2021

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  Southern Traverse County in west central Minnesota...
  North central Big Stone County in west central Minnesota...

* Until 730 PM CDT.
    
* At 658 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Beardsley, or 17 miles southwest of Wheaton,
  moving northeast at 25 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...
  Barry around 705 PM CDT.
  Siloah Country Church and Halls Landing around 715 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Collis, Silver Bridge and Dumont.

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 4549 9661 4563 9685 4566 9682 4568 9677
      4571 9674 4574 9665 4578 9663 4580 9661
      4564 9626
TIME...MOT...LOC 2358Z 227DEG 24KT 4559 9669 

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

$$

Connelly

2 follow-up statements

607 
WWUS53 KABR 100013
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
713 PM CDT Sat Oct 9 2021

MNC011-155-100030-
/O.CON.KABR.TO.W.0019.000000T0000Z-211010T0030Z/
Traverse MN-Big Stone MN-
713 PM CDT Sat Oct 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR SOUTHERN
TRAVERSE AND NORTH CENTRAL BIG STONE COUNTIES...
    
At 713 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Siloah Country Church, or 9 miles south of Wheaton,
moving northeast at 30 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.

Locations impacted include...
  Dumont.

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 4552 9655 4571 9674 4574 9665 4578 9663
      4580 9661 4564 9626
TIME...MOT...LOC 0013Z 228DEG 26KT 4567 9653 

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

$$

Connelly

701 
WWUS53 KABR 100019
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
719 PM CDT Sat Oct 9 2021

MNC011-155-100028-
/O.CAN.KABR.TO.W.0019.000000T0000Z-211010T0030Z/
Traverse MN-Big Stone MN-
719 PM CDT Sat Oct 9 2021

...THE TORNADO WARNING FOR SOUTHERN TRAVERSE AND NORTH CENTRAL BIG
STONE COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds are still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Minnesota...and northeastern South Dakota.

LAT...LON 4552 9655 4571 9674 4574 9665 4578 9663
      4580 9661 4564 9626
TIME...MOT...LOC 0017Z 227DEG 24KT 4570 9649 

$$

Connelly

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 6:15 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone, Traverse	60 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.