Alert archive / South Dakota / Tornado Warnings in 2021

Tornado Warning 21, NWS Aberdeen, SD

October 13, 2021Marshall County, Roberts County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Oct 13, 2021, 3:27 PM CDT for Marshall County, Roberts County, South Dakota. It was in force for 33 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, 3:27 PM CDT (20:27 UTC)
Expired: Oct 13, 2021, 4:00 PM CDT
In force: 33 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Marshall County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 106 km from the middle of the area, began a volume at 20:27 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, 8.5 hours before the alert went out and 139 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.

778 
WFUS53 KABR 132027
TORABR
SDC091-109-132100-
/O.NEW.KABR.TO.W.0021.211013T2027Z-211013T2100Z/

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

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  Northwestern Roberts County in northeastern South Dakota...
  Northeastern Marshall County in northeastern South Dakota...

* Until 400 PM CDT.
    
* At 327 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Long Hollow Housing, or 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 dangerous storm will be near...
  Sica Hollow State Park around 330 PM CDT.
  Claire City around 345 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4566 9708 4567 9716 4593 9735 4594 9698
TIME...MOT...LOC 2027Z 177DEG 34KT 4570 9711 

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

$$

Dorn

2 follow-up statements

114 
WWUS53 KABR 132038
SVSABR

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

SDC091-109-132100-
/O.CON.KABR.TO.W.0021.000000T0000Z-211013T2100Z/
Roberts SD-Marshall SD-
338 PM CDT Wed Oct 13 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM CDT FOR
NORTHWESTERN ROBERTS AND NORTHEASTERN MARSHALL COUNTIES...
    
At 338 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Claire City, or 9 miles north of Sisseton, moving
north 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.

This dangerous storm will be near...
  Claire City around 345 PM CDT.

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 4566 9708 4567 9716 4593 9735 4594 9698
TIME...MOT...LOC 2038Z 175DEG 30KT 4579 9712 

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

$$

Dorn

963 
WWUS53 KABR 132045
SVSABR

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

SDC091-109-132100-
/O.CON.KABR.TO.W.0021.000000T0000Z-211013T2100Z/
Roberts SD-Marshall SD-
345 PM CDT Wed Oct 13 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM CDT FOR
NORTHWESTERN ROBERTS AND NORTHEASTERN MARSHALL COUNTIES...
    
At 344 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Claire City, or 13 miles north of Sisseton, moving
north 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
northwestern Roberts and northeastern Marshall Counties, including
the following locations... northern Lake Traverse Reservation.

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 4566 9708 4567 9716 4593 9735 4594 9698
TIME...MOT...LOC 2044Z 170DEG 40KT 4586 9707 

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, 3:10 PM CDT	Tornado Warning Tornado observed	ABR	Roberts	20 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.