Alert archive / South Dakota / Tornado Warnings in 2021

Tornado Warning 20, NWS Aberdeen, SD

October 13, 2021Roberts County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Oct 13, 2021, 3:10 PM CDT for Roberts County, South Dakota. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 13, 2021, 3:10 PM CDT (20:10 UTC)
Expired: Oct 13, 2021, 3:30 PM CDT
In force: 20 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Roberts County, SD

The radar

The Aberdeen radar (KABR), 107 km from the middle of the area, began a volume at 20:10 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.2 hours before the alert went out and 129 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 913 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

557 
WFUS53 KABR 132010
TORABR
SDC109-132030-
/O.NEW.KABR.TO.W.0020.211013T2010Z-211013T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Aberdeen SD
310 PM CDT Wed Oct 13 2021

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  Southwestern Roberts County in northeastern South Dakota...

* Until 330 PM CDT.

* At 309 PM CDT, a confirmed tornado was located near Finley Heights
  Housing, or 10 miles south of Sisseton, moving northeast at 30 mph.

  HAZARD...Damaging tornado.

  SOURCE...Weather spotters 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.

* The tornado will be near...
  Peever around 320 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Sisseton and Dakota Connection & Casino.

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.

This line of thunderstorms is capable of producing tornadoes. 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 4544 9704 4550 9715 4574 9711 4562 9686
TIME...MOT...LOC 2009Z 209DEG 26KT 4551 9706 

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

$$

Dorn

1 follow-up statement

071 
WWUS53 KABR 132019
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
319 PM CDT Wed Oct 13 2021

SDC109-132030-
/O.CON.KABR.TO.W.0020.000000T0000Z-211013T2030Z/
Roberts SD-
319 PM CDT Wed Oct 13 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR WEST
CENTRAL ROBERTS COUNTY...
    
At 319 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Sisseton, moving north at 40 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
west central Roberts County, including the following locations...
northern Lake Traverse Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4553 9705 4557 9713 4574 9711 4562 9686
TIME...MOT...LOC 2019Z 185DEG 36KT 4562 9708 

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

$$

Dorn

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 13, 2:03 PM CDT	Special Weather Statement	ABR	Potter	27 min
Oct 13, 2:05 PM CDT	High Wind Warning	ABR	Hughes, Jones, Lyman, Stanley	8 hr
Oct 13, 2:10 PM CDT	Special Weather Statement	ABR	Sully	20 min
Oct 13, 3:27 PM CDT	Tornado Warning	ABR	Marshall, Roberts	33 min
Oct 13, 3:50 PM CDT	Tornado Warning	ABR	Marshall, Roberts	40 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.