Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 32, NWS Sioux Falls, SD

June 23, 2021Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 23, 2021, 7:12 PM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 46 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: Jun 23, 2021, 7:12 PM CDT (00:12 UTC)
Expired: Jun 23, 2021, 7:58 PM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Charles Mix County, SD, Gregory County, SD

The radar

The North Platte radar (KLNX), 175 km from the middle of the area, began a volume at 00:13 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
Jun 23, 7:20 PM CDT	HAIL 0.75	1 Nw Gregory, SD
Jun 23, 7:20 PM CDT	HAIL 0.88	1 Nnw Gregory, SD
Jun 23, 7:20 PM CDT	HAIL 0.88	Gregory, SD
Jun 23, 7:30 PM CDT	HAIL 1	Burke, SD	SHERIFF REPORTED QUARTER SIZE HAIL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.2 hours before the alert went out and 201 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: 350 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 3369 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

020 
WUUS53 KFSD 240012
SVRFSD
SDC023-053-240115-
/O.NEW.KFSD.SV.W.0032.210624T0012Z-210624T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
712 PM CDT Wed Jun 23 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Charles Mix County in south central South Dakota...
  Gregory County in south central South Dakota...

* Until 815 PM CDT.

* At 712 PM CDT, a severe thunderstorm was located near Dallas, or 20
  miles southeast of Winner, 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...
  Dallas around 715 PM CDT.
  Gregory around 725 PM CDT.
  Burke around 735 PM CDT.
  Herrick around 745 PM CDT.

Other locations impacted by this severe thunderstorm include Fairfax.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4331 9953 4337 9889 4300 9882 4300 9953
TIME...MOT...LOC 0012Z 260DEG 31KT 4317 9957 

HAIL...1.25IN
WIND...60MPH
 
$$

Kalin

3 follow-up statements

372 
WWUS53 KFSD 240037
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
737 PM CDT Wed Jun 23 2021

SDC023-053-240115-
/O.CON.KFSD.SV.W.0032.000000T0000Z-210624T0115Z/
Charles Mix SD-Gregory SD-
737 PM CDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHWESTERN CHARLES MIX AND SOUTHWESTERN GREGORY COUNTIES...

At 736 PM CDT, a severe thunderstorm was located near Burke, or 33
miles west of Lake Andes, moving east at 45 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 Charles Mix and southwestern Gregory Counties, including
the following locations... Fairfax.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4332 9941 4337 9889 4300 9882 4305 9936
TIME...MOT...LOC 0036Z 257DEG 40KT 4323 9920 

HAIL...1.00IN
WIND...60MPH
 
$$

Kalin

934 
WWUS53 KFSD 240048
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
748 PM CDT Wed Jun 23 2021

SDC023-053-240115-
/O.CON.KFSD.SV.W.0032.000000T0000Z-210624T0115Z/
Charles Mix SD-Gregory SD-
748 PM CDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHWESTERN CHARLES MIX AND SOUTH CENTRAL GREGORY COUNTIES...

At 747 PM CDT, a severe thunderstorm was located 11 miles northeast
of Herrick, or 27 miles west of Lake Andes, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. Quarter size hail 
         was reported in Burke around 740 pm. 

SOURCE...Trained weather spotters.

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

Locations impacted include...
Bonesteel, St. Charles and Fairfax. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4333 9919 4337 9889 4300 9882 4310 9915
TIME...MOT...LOC 0047Z 260DEG 31KT 4325 9907 

HAIL...1.00IN
WIND...60MPH
 
$$

Kalin

320 
WWUS53 KFSD 240058
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
758 PM CDT Wed Jun 23 2021

SDC023-053-240107-
/O.CAN.KFSD.SV.W.0032.000000T0000Z-210624T0115Z/
Charles Mix SD-Gregory SD-
758 PM CDT Wed Jun 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHARLES MIX AND
SOUTH CENTRAL GREGORY COUNTIES IS CANCELLED...
                
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 has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 4333 9919 4337 9889 4300 9882 4310 9915
TIME...MOT...LOC 0055Z 260DEG 31KT 4327 9894 

$$

Kalin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 7:46 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas, Hutchinson	44 min
Jun 23, 8:05 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas	40 min
Jun 23, 8:20 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Clay, Davison, Douglas, Hanson and 3 more	55 min
Jun 23, 8:36 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas, Hutchinson	18 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.