Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 153, NWS Sioux Falls, SD

August 30, 2021Beadle County, Jerauld County, Sanborn County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 30, 2021, 11:19 PM CDT for Beadle County, Jerauld County, Sanborn County, South Dakota. It was in force for 41 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 30, 2021, 11:19 PM CDT (04:19 UTC)
Expired: Aug 31, 2021, 12:00 AM CDT
In force: 41 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Sioux Falls radar (KFSD), 135 km from the middle of the area, began a volume at 04:20 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 30, 9:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.3 hours before the alert went out and 90 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: 205 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1953 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

760 
WUUS53 KFSD 310419
SVRFSD
SDC005-073-111-310500-
/O.NEW.KFSD.SV.W.0153.210831T0419Z-210831T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1119 PM CDT Mon Aug 30 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Sanborn County in east central South Dakota...
  South central Beadle County in east central South Dakota...
  East central Jerauld County in central South Dakota...

* Until midnight CDT.

* At 1118 PM CDT, a severe thunderstorm was located near Woonsocket,
  or 18 miles south of Huron, moving northeast at 20 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 remain over mainly rural areas of
  northwestern Sanborn, south central Beadle and east central Jerauld
  Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4399 9837 4412 9845 4432 9810 4408 9799
TIME...MOT...LOC 0418Z 244DEG 16KT 4411 9833 

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

$$

APT

2 follow-up statements

310 
WWUS53 KFSD 310447
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1147 PM CDT Mon Aug 30 2021

SDC005-073-111-310500-
/O.CON.KFSD.SV.W.0153.000000T0000Z-210831T0500Z/
Sanborn SD-Beadle SD-Jerauld SD-
1147 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR NORTHWESTERN SANBORN...SOUTH CENTRAL BEADLE AND EAST CENTRAL
JERAULD COUNTIES...

At 1147 PM CDT, a severe thunderstorm was located near Woonsocket, or
15 miles south of Huron, moving east at 15 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 remain over mainly rural areas of
northwestern Sanborn, south central Beadle and east central Jerauld
Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4399 9837 4412 9845 4432 9810 4408 9799
TIME...MOT...LOC 0447Z 252DEG 11KT 4414 9825 

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

$$

APT

435 
WWUS53 KFSD 310451
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1151 PM CDT Mon Aug 30 2021

SDC005-073-111-310501-
/O.EXP.KFSD.SV.W.0153.000000T0000Z-210831T0500Z/
Sanborn SD-Beadle SD-Jerauld SD-
1151 PM CDT Mon Aug 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SANBORN...SOUTH
CENTRAL BEADLE AND EAST CENTRAL JERAULD COUNTIES WILL EXPIRE AT
MIDNIGHT CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
central South Dakota.

LAT...LON 4399 9837 4412 9845 4432 9810 4408 9799
TIME...MOT...LOC 0451Z 244DEG 16KT 4414 9824 

$$

APT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 7:29 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	46 min
Aug 30, 7:57 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, McCook, Minnehaha, Turner	48 min
Aug 31, 12:00 AM CDT	Flash Flood Warning	FSD	Aurora, Brule	3 hr
Aug 31, 12:05 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas	40 min
Aug 31, 12:15 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson	45 min
Aug 31, 1:26 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Gregory	49 min
Aug 31, 2:14 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	31 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.