Alert archive / South Dakota / Tornado Warnings in 2021

Tornado Warning 8, NWS Aberdeen, SD

October 9, 2021Brown County, Spink County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Oct 9, 2021, 4:10 PM CDT for Brown County, Spink County, South Dakota. It was in force for 35 min. 2 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, 4:10 PM CDT (21:10 UTC)
Expired: Oct 9, 2021, 4:45 PM CDT
In force: 35 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Brown County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 35 km from the middle of the area, began a volume at 21:12 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, 4:12 PM CDT	TORNADO	2 Sw Brentford, SD	12 LARGE HAY BALES WERE ROLLED SOME DISTANCE, INCLUDING OVER A FENCE. TIME ESTIMATED BASED ON RADAR. SECONDARY PUBLIC REPORT OF BRIEF TORNADO SOUTHWEST OF BRENTFORD IN AN OPEN FIELD.
Oct 9, 4:25 PM CDT	TSTM WND GST 75	6 Ene Brentford, SD

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, 9.2 hours before the alert went out and 29 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.

915 
WFUS53 KABR 092110
TORABR
SDC013-115-092145-
/O.NEW.KABR.TO.W.0008.211009T2110Z-211009T2145Z/

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

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  South central Brown County in northeastern South Dakota...
  Northeastern Spink County in northeastern South Dakota...

* Until 445 PM CDT.
    
* At 409 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Brentford, or 20 miles north of Redfield, moving
  northeast at 35 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...
  Stratford.

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 4503 9836 4516 9854 4535 9826 4518 9803
TIME...MOT...LOC 2109Z 225DEG 29KT 4516 9838 

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

$$

Connelly

2 follow-up statements

658 
WWUS53 KABR 092122
SVSABR

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

SDC013-115-092145-
/O.CON.KABR.TO.W.0008.000000T0000Z-211009T2145Z/
Brown SD-Spink SD-
422 PM CDT Sat Oct 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR SOUTH
CENTRAL BROWN AND NORTHEASTERN SPINK COUNTIES...
        
At 421 PM CDT, a confirmed tornado was located near Conde, or 19
miles south of Groton, moving northeast at 35 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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...
Conde, Brentford and Stratford. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4506 9829 4523 9843 4535 9826 4518 9803
TIME...MOT...LOC 2121Z 241DEG 31KT 4519 9820 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Connelly

222 
WWUS53 KABR 092140
SVSABR

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

SDC013-115-092150-
/O.EXP.KABR.TO.W.0008.000000T0000Z-211009T2145Z/
Brown SD-Spink SD-
440 PM CDT Sat Oct 9 2021

...THE TORNADO WARNING FOR SOUTH CENTRAL BROWN AND NORTHEASTERN SPINK
COUNTIES WILL EXPIRE AT 445 PM 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 1000 PM CDT for
northeastern South Dakota.

LAT...LON 4506 9829 4523 9843 4535 9826 4518 9803
TIME...MOT...LOC 2140Z 225DEG 29KT 4530 9805 

$$

Connelly

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 12:05 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	27 min
Oct 9, 1:57 PM CDT	Special Weather Statement	ABR	Lyman	33 min
Oct 9, 4:30 PM CDT	Tornado Warning	ABR	Brown	15 min
Oct 9, 4:33 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Codington, Day, Hamlin, Spink	42 min
Oct 9, 4:33 PM CDT	Tornado Warning Tornado observed	ABR	Brown, Day, Spink	27 min
Oct 9, 4:57 PM CDT	Tornado Warning	ABR	Brown, Day, Marshall	18 min
Oct 9, 5:16 PM CDT	Tornado Warning	ABR	Day, Marshall	29 min
Oct 9, 5:17 PM CDT	Tornado Warning	ABR	Brown, Day, Marshall	28 min
Oct 9, 5:18 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Codington, Day, Grant, Hamlin and 2 more	57 min
Oct 9, 5:44 PM CDT	Tornado Warning	ABR	Brown, Marshall	31 min
Oct 9, 5:47 PM CDT	Tornado Warning	ABR	Day, Marshall, Roberts	28 min
Oct 9, 6:07 PM CDT	Tornado Warning Tornado observed	ABR	Day, Roberts	23 min
Oct 9, 6:14 PM CDT	Tornado Warning	ABR	Marshall, Roberts	31 min
Oct 9, 6:15 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Day, Deuel, Grant, Hamlin, Marshall and 1 more	60 min
Oct 9, 6:28 PM CDT	Tornado Warning	ABR	Roberts	21 min

Nearby

Tornado Warnings in South Dakota, 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.