Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 92, NWS Sioux Falls, SD

August 22, 2021Aurora County, Brule County, Jerauld County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 22, 2021, 5:48 PM CDT for Aurora County, Brule County, Jerauld County, South Dakota. It was in force for 42 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, 5:48 PM CDT (22:48 UTC)
Expired: Aug 22, 2021, 6:30 PM CDT
In force: 42 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Aberdeen radar (KABR), 171 km from the middle of the area, began a volume at 22:47 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 12:00Z, 10.8 hours before the alert went out and 113 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: 1388 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

933 
WUUS53 KFSD 222248
SVRFSD
SDC003-015-073-222330-
/O.NEW.KFSD.SV.W.0092.210822T2248Z-210822T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
548 PM CDT Sun Aug 22 2021

The National Weather Service in Sioux Falls has issued a

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

* Until 630 PM CDT.

* At 547 PM CDT, a severe thunderstorm was located near Gann Valley,
  or 13 miles north of Kimball, moving east at 35 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 630 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4393 9912 4394 9893 4406 9892 4417 9852
      4385 9855 4379 9913
TIME...MOT...LOC 2247Z 251DEG 29KT 4395 9900 

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

$$

Schumacher

2 follow-up statements

750 
WWUS53 KFSD 222306
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
606 PM CDT Sun Aug 22 2021

SDC003-015-073-222330-
/O.CON.KFSD.SV.W.0092.000000T0000Z-210822T2330Z/
Aurora SD-Jerauld SD-Brule SD-
606 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHWESTERN AURORA...WESTERN JERAULD AND NORTHEASTERN BRULE
COUNTIES...

At 606 PM CDT, a severe thunderstorm was located 8 miles southeast of
Gann Valley, or 15 miles north of Kimball, moving east at 50 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

This severe storm will be near...
  Wessington Springs around 625 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4393 9909 4393 9908 4394 9893 4406 9892
      4417 9852 4385 9855 4382 9905
TIME...MOT...LOC 2306Z 255DEG 42KT 4395 9885 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Schumacher

698 
WWUS53 KFSD 222314
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
614 PM CDT Sun Aug 22 2021

SDC003-015-073-222330-
/O.CON.KFSD.SV.W.0092.000000T0000Z-210822T2330Z/
Aurora SD-Jerauld SD-Brule SD-
614 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR NORTHWESTERN AURORA...SOUTHWESTERN JERAULD AND NORTHEASTERN BRULE
COUNTIES...

At 614 PM CDT, a severe thunderstorm was located 10 miles southeast
of Gann Valley, or 14 miles northeast of Kimball, moving east at 25
mph.

HAZARD...Tennis ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

This severe thunderstorm will remain over mainly rural areas of
northwestern Aurora, southwestern Jerauld and northeastern Brule
Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4394 9893 4404 9889 4411 9853 4385 9855
      4383 9892 4393 9895
TIME...MOT...LOC 2314Z 263DEG 20KT 4393 9882 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Schumacher

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 5:15 PM CDT	Severe Thunderstorm Warning	FSD	Brule	45 min
Aug 22, 6:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Aurora, Jerauld	40 min
Aug 22, 6:47 PM CDT	Tornado Warning	FSD	Aurora, Davison, Sanborn	32 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.