Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 170, NWS Sioux Falls, SD

October 9, 2021Kingsbury County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Oct 9, 2021, 5:53 PM CDT for Kingsbury County, South Dakota. It was in force for 27 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 9, 2021, 5:53 PM CDT (22:53 UTC)
Expired: Oct 9, 2021, 6:20 PM CDT
In force: 27 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Kingsbury County, SD

The radar

The Sioux Falls radar (KFSD), 111 km from the middle of the area, began a volume at 22:52 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
Oct 9, 2:56 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.9 hours before the alert went out and 94 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.

252 
WUUS53 KFSD 092253
SVRFSD
SDC077-092345-
/O.NEW.KFSD.SV.W.0170.211009T2253Z-211009T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
553 PM CDT Sat Oct 9 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Kingsbury County in east central South Dakota...

* Until 645 PM CDT.

* At 552 PM CDT, a severe thunderstorm was located 7 miles southwest
  of Bryant, or 13 miles north of Lake Thompson State Recreation
  Area, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  northwestern Kingsbury County, including the following locations...
  Bancroft and Erwin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4454 9713 4453 9713 4420 9763 4454 9783
TIME...MOT...LOC 2252Z 224DEG 34KT 4450 9754 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

2 follow-up statements

692 
WWUS53 KFSD 092309
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
609 PM CDT Sat Oct 9 2021

SDC077-092345-
/O.CON.KFSD.SV.W.0170.000000T0000Z-211009T2345Z/
Kingsbury SD-
609 PM CDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHEASTERN KINGSBURY COUNTY...

At 608 PM CDT, a severe thunderstorm was located near Bryant, or 14
miles north of Lake Thompson State Recreation Area, moving northeast
at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Badger and Erwin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4454 9713 4453 9713 4440 9733 4443 9761
      4454 9766
TIME...MOT...LOC 2308Z 220DEG 37KT 4453 9746 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

978 
WWUS53 KFSD 092320
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
620 PM CDT Sat Oct 9 2021

SDC077-092329-
/O.CAN.KFSD.SV.W.0170.000000T0000Z-211009T2345Z/
Kingsbury SD-
620 PM CDT Sat Oct 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN KINGSBURY COUNTY
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
east central South Dakota.

LAT...LON 4454 9713 4453 9713 4440 9733 4443 9761
      4454 9766
TIME...MOT...LOC 2318Z 224DEG 34KT 4461 9735 

$$

SG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 3:39 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Brule, Jerauld	51 min
Oct 9, 3:56 PM CDT	Tornado Warning	FSD	Aurora, Jerauld	34 min
Oct 9, 4:23 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld, Kingsbury, Sanborn	52 min
Oct 9, 5:08 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury	52 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Every severe thunderstorm warning 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.