Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 168, NWS Sioux Falls, SD

October 9, 20214 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Oct 9, 2021, 4:23 PM CDT for 4 counties in South Dakota. It was in force for 52 min. 3 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, 4:23 PM CDT (21:23 UTC)
Expired
Oct 9, 2021, 5:15 PM CDT
In force
52 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Beadle County, SD, Jerauld County, SD, Kingsbury County, SD, Sanborn County, SD

The radar

The Aberdeen radar (KABR), 139 km from the middle of the area, began a volume at 21:25 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

TimeReportWhereRemark
Oct 9, 4:30 PM CDTTSTM WND GST 603 S Alpena, SDSTRONG WINDS OCCURRED WITH PEA TO QUARTER SIZE HAIL.
Oct 9, 4:30 PM CDTHAIL 13 S Alpena, SD
Oct 9, 4:32 PM CDTTSTM WND DMG2 Sw Alpena, SDCOMBINATION OF HAIL AND STRONG WINDS DAMAGED SIDING TO A HOME.

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.

IssuedProductOfficeLasted
Oct 9, 2:56 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 9.4 hours before the alert went out and 77 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-pSkew-T log-p diagram, Aberdeen, SD at 12:00Z on 2021-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 12:00Z on 2021-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

730 
WUUS53 KFSD 092123
SVRFSD
SDC005-073-077-111-092215-
/O.NEW.KFSD.SV.W.0168.211009T2123Z-211009T2215Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Kingsbury County in east central South Dakota...
  Northern Sanborn County in east central South Dakota...
  Beadle County in east central South Dakota...
  Eastern Jerauld County in central South Dakota...

* Until 515 PM CDT.

* At 423 PM CDT, a severe thunderstorm was located near Alpena, or 18
  miles southwest of Huron, moving northeast at 35 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 be near...
  Alpena around 430 PM CDT.
  Virgil around 435 PM CDT.
  Huron around 455 PM CDT.
  Cavour around 505 PM CDT.

Other locations impacted by this severe thunderstorm include
Broadland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4429 9762 4394 9845 4394 9850 4419 9873
      4420 9870 4424 9870 4455 9850
TIME...MOT...LOC 2123Z 227DEG 33KT 4415 9844 

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

$$

SG
2 follow-up statements
700 
WWUS53 KFSD 092145
SVSFSD

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

SDC073-092154-
/O.CAN.KFSD.SV.W.0168.000000T0000Z-211009T2215Z/
Jerauld SD-
445 PM CDT Sat Oct 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JERAULD COUNTY IS
CANCELLED...
    
The severe 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 1000 PM CDT for
central and east central South Dakota.

LAT...LON 4429 9762 4399 9833 4419 9833 4437 9862
      4455 9850
TIME...MOT...LOC 2144Z 227DEG 33KT 4429 9824 

$$

SDC005-077-111-092215-
/O.CON.KFSD.SV.W.0168.000000T0000Z-211009T2215Z/
Kingsbury SD-Sanborn SD-Beadle SD-
445 PM CDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHWESTERN KINGSBURY...NORTHERN SANBORN AND BEADLE COUNTIES...

At 444 PM CDT, a severe thunderstorm was located near Huron, 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 storm will be near...
  Huron around 455 PM CDT.
  Cavour around 500 PM CDT.

Other locations impacted by this severe thunderstorm include
Broadland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4429 9762 4399 9833 4419 9833 4437 9862
      4455 9850
TIME...MOT...LOC 2144Z 227DEG 33KT 4429 9824 

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

$$

SG
848 
WWUS53 KFSD 092202
SVSFSD

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

SDC005-077-111-092215-
/O.CON.KFSD.SV.W.0168.000000T0000Z-211009T2215Z/
Kingsbury SD-Sanborn SD-Beadle SD-
502 PM CDT Sat Oct 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHWESTERN KINGSBURY...NORTHEASTERN SANBORN AND SOUTHEASTERN
BEADLE COUNTIES...

At 502 PM CDT, a severe thunderstorm was located near Cavour, or 9
miles southeast of Huron, 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 storm will be near...
  Cavour around 510 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4412 9803 4421 9824 4447 9824 4429 9762
TIME...MOT...LOC 2202Z 220DEG 33KT 4430 9804 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 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.

IssuedProductOfficeCountiesLasted
Oct 9, 3:39 PM CDTSevere Thunderstorm WarningFSDAurora, Beadle, Brule, Jerauld51 min
Oct 9, 3:56 PM CDTTornado WarningFSDAurora, Jerauld34 min
Oct 9, 5:08 PM CDTSevere Thunderstorm WarningFSDBeadle, Kingsbury52 min
Oct 9, 5:53 PM CDTSevere Thunderstorm WarningFSDKingsbury27 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021Every 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.