Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 167, NWS Sioux Falls, SD

October 9, 20214 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Oct 9, 2021, 3:39 PM CDT for 4 counties in South Dakota. It was in force for 51 min. 4 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, 3:39 PM CDT (20:39 UTC)
Expired: Oct 9, 2021, 4:30 PM CDT
In force: 51 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Aurora County, SD, Beadle County, SD, Brule County, SD, Jerauld County, SD

The radar

The Aberdeen radar (KABR), 154 km from the middle of the area, began a volume at 20:38 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, 3:46 PM CDT	HAIL 1	12 Sw Wessington Spring, SD	TIME ESTIMATED BY RADAR. SOCIAL MEDIA REPORT.
Oct 9, 3:49 PM CDT	HAIL 1.75	12 Sw Wessington Spring, SD	HAIL UP TO GOLF BALL SIZE REPORTED NEAR CROW LAKE TO SHERIFFS OFFICE IN WESSINGTON SPRINGS.
Oct 9, 3:51 PM CDT	HAIL 1	11 Sw Wessington Spring, SD	SPOTTER REPORTED HAIL UP TO 1 INCH AND TREE BRANCHES UP TO 2 INCHES IN DIAMETER DOWN.
Oct 9, 3:56 PM CDT	HAIL 1.75	11 Sw Wessington Spring, SD	TIME ESTIMATED BY RADAR. SPOTTER REPORTED LARGE HAIL, STRONG WINDS, BUT NO OTHER DAMAGE.

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, 8.7 hours before the alert went out and 95 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.

988 
WUUS53 KFSD 092039
SVRFSD
SDC003-005-015-073-092130-
/O.NEW.KFSD.SV.W.0167.211009T2039Z-211009T2130Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Beadle County in east central South Dakota...
  Northwestern Aurora County in south central South Dakota...
  Jerauld County in central South Dakota...
  Northeastern Brule County in south central South Dakota...

* Until 430 PM CDT.

* At 338 PM CDT, a severe thunderstorm was located near Gann Valley,
  or 15 miles north of Kimball, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Wessington Springs around 410 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4418 9843 4382 9885 4393 9905 4394 9893
      4420 9893 4420 9870 4425 9870
TIME...MOT...LOC 2038Z 217DEG 26KT 4396 9889 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

2 follow-up statements

627 
WWUS53 KFSD 092047
SVSFSD

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

SDC003-005-015-073-092130-
/O.CON.KFSD.SV.W.0167.000000T0000Z-211009T2130Z/
Beadle SD-Aurora SD-Jerauld SD-Brule SD-
347 PM CDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SOUTHWESTERN BEADLE...NORTHWESTERN AURORA...JERAULD AND
NORTHEASTERN BRULE COUNTIES...

At 347 PM CDT, a severe thunderstorm was located 9 miles east of Gann
Valley, or 18 miles northeast of Kimball, moving northeast at 35 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Wessington Springs around 410 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4418 9843 4382 9885 4391 9896 4394 9893
      4420 9893 4420 9870 4425 9870
TIME...MOT...LOC 2047Z 221DEG 29KT 4400 9880 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

033 
WWUS53 KFSD 092109
SVSFSD

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

SDC003-015-092118-
/O.CAN.KFSD.SV.W.0167.000000T0000Z-211009T2130Z/
Aurora SD-Brule SD-
409 PM CDT Sat Oct 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN AURORA AND
NORTHEASTERN BRULE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
moved out of the warned area. Therefore, the warning has been 
cancelled.

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

LAT...LON 4398 9867 4403 9873 4420 9888 4420 9870
      4425 9870 4418 9843
TIME...MOT...LOC 2108Z 223DEG 26KT 4410 9861 

$$

SDC005-073-092130-
/O.CON.KFSD.SV.W.0167.000000T0000Z-211009T2130Z/
Beadle SD-Jerauld SD-
409 PM CDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SOUTHWESTERN BEADLE AND WESTERN JERAULD COUNTIES...

At 408 PM CDT, a severe thunderstorm was located over Wessington
Springs, or 26 miles southwest of Huron, moving northeast at 30 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
southwestern Beadle and western Jerauld Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4398 9867 4403 9873 4420 9888 4420 9870
      4425 9870 4418 9843
TIME...MOT...LOC 2108Z 223DEG 26KT 4410 9861 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 3:56 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
Oct 9, 5:53 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	27 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.