Alert archive / South Dakota / Tornado Warnings in 2021

Tornado Warning 5, NWS Aberdeen, SD

August 22, 2021Day County, Grant County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Aug 22, 2021, 8:05 PM CDT for Day County, Grant County, South Dakota. It was in force for 25 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: Aug 22, 2021, 8:05 PM CDT (01:05 UTC)
Expired: Aug 22, 2021, 8:30 PM CDT
In force: 25 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Day County, SD, Grant County, SD

The radar

The Aberdeen radar (KABR), 109 km from the middle of the area, began a volume at 01:05 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 22, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.1 hours before the alert went out and 110 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: 166 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1323 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

122 
WFUS53 KABR 230105
TORABR
SDC037-051-230130-
/O.NEW.KABR.TO.W.0005.210823T0105Z-210823T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Aberdeen SD
805 PM CDT Sun Aug 22 2021

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  Southeastern Day County in northeastern South Dakota...
  Northwestern Grant County in northeastern South Dakota...

* Until 830 PM CDT.

* At 755 PM CDT, a confirmed tornado was located near 7 miles east 
  northeast of Lily and the storm continues moving east at 40 mph.

  HAZARD...Damaging tornado and quarter size hail.

  SOURCE...Public 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...
  Marvin.

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 4515 9691 4515 9703 4520 9735 4526 9732
      4529 9689
TIME...MOT...LOC 0104Z 269DEG 33KT 4524 9726 

TORNADO...OBSERVED
MAX HAIL SIZE...1.00 IN

$$

Lueck

2 follow-up statements

281 
WWUS53 KABR 230115
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
815 PM CDT Sun Aug 22 2021

SDC037-230125-
/O.CAN.KABR.TO.W.0005.000000T0000Z-210823T0130Z/
Day SD-
815 PM CDT Sun Aug 22 2021

...THE TORNADO WARNING FOR SOUTHEASTERN DAY COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern South Dakota.

LAT...LON 4515 9691 4515 9703 4517 9715 4527 9711
      4529 9689
TIME...MOT...LOC 0115Z 268DEG 36KT 4524 9706 

$$

SDC051-230130-
/O.CON.KABR.TO.W.0005.000000T0000Z-210823T0130Z/
Grant SD-
815 PM CDT Sun Aug 22 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR
NORTHWESTERN GRANT COUNTY...
    
At 815 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Summit, or 20 miles west of Milbank, moving east 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.

Locations impacted include...
Marvin.

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 4515 9691 4515 9703 4517 9715 4527 9711
      4529 9689
TIME...MOT...LOC 0115Z 268DEG 36KT 4524 9706 

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

$$

Lueck

732 
WWUS53 KABR 230129
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
829 PM CDT Sun Aug 22 2021

SDC051-230138-
/O.EXP.KABR.TO.W.0005.000000T0000Z-210823T0130Z/
Grant SD-
829 PM CDT Sun Aug 22 2021

...THE TORNADO WARNING FOR NORTHWESTERN GRANT COUNTY WILL EXPIRE AT
830 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern South Dakota.

LAT...LON 4515 9691 4515 9703 4517 9715 4527 9711
      4529 9689
TIME...MOT...LOC 0128Z 269DEG 33KT 4524 9690 

$$

Lueck

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 7:17 PM CDT	Severe Thunderstorm Warning	ABR	Day	43 min
Aug 22, 8:12 PM CDT	Special Weather Statement	ABR	Codington	33 min
Aug 22, 8:39 PM CDT	Special Weather Statement	ABR	Grant	36 min
Aug 23, 4:13 PM CDT	Severe Thunderstorm Warning	ABR	Jones	27 min
Aug 23, 5:07 PM CDT	Severe Thunderstorm Warning	ABR	Jones	38 min
Aug 23, 6:13 PM CDT	Special Weather Statement	ABR	Jones	32 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.