Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Sioux Falls, SD

June 23, 20219 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 23, 2021, 8:20 PM CDT for 9 counties in South Dakota. It was in force for 55 min. 1 report 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, 8:20 PM CDT (01:20 UTC)
Expired: Jun 23, 2021, 9:15 PM CDT
In force: 55 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Hanson County, SD, Hutchinson County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 104 km from the middle of the area, began a volume at 01:20 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.

What was reported inside it

Time	Report	Where	Remark
Jun 23, 9:00 PM CDT	TSTM WND GST 60	Tyndall, SD	WINDS ESTIMATED AROUND 60 MPH. LOTS OF SMALL BRANCHES DOWN WITH A LARGE AMOUNT OF FRUIT BLOWN OFF TREES. SPOTTER ESTIMATED STRONGEST WIND WAS AROUND 9 PM.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.3 hours before the alert went out and 214 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: 2039 J/kg
Mixed-layer CIN: -306 J/kg
Mixed-layer LCL: 1664 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

682 
WUUS53 KFSD 240120
SVRFSD
SDC009-023-027-035-043-061-067-125-135-240215-
/O.NEW.KFSD.SV.W.0035.210624T0120Z-210624T0215Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Davison County in southeastern South Dakota...
  West central Clay County in southeastern South Dakota...
  Southeastern Charles Mix County in south central South Dakota...
  Bon Homme County in southeastern South Dakota...
  Eastern Douglas County in south central South Dakota...
  Yankton County in southeastern South Dakota...
  Southern Hanson County in southeastern South Dakota...
  Western Turner County in southeastern South Dakota...
  Hutchinson County in southeastern South Dakota...

* Until 915 PM CDT.

* At 820 PM CDT, severe thunderstorms were located along a line
  extending from near Milltown to near Springfield, moving east at 50
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Springfield around 825 PM CDT.
  Clayton around 830 PM CDT.
  Freeman and Dolton around 845 PM CDT.
  Marion around 850 PM CDT.

Other locations impacted by these severe thunderstorms include
Gayville, Lesterville, Olivet and Yankton Sioux Tribal Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4284 9815 4288 9831 4293 9842 4358 9829
      4352 9761 4350 9761 4348 9717 4280 9715
      4281 9721 4285 9723 4287 9730 4285 9736
      4287 9741 4285 9744 4286 9762 4284 9769
      4287 9785 4277 9794 4276 9803
TIME...MOT...LOC 0120Z 286DEG 44KT 4348 9780 4285 9801 

HAIL...<.75IN
WIND...60MPH
 
$$

Kalin

3 follow-up statements

038 
WWUS53 KFSD 240128
SVSFSD

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

SDC009-023-027-035-043-061-067-125-135-240215-
/O.CON.KFSD.SV.W.0035.000000T0000Z-210624T0215Z/
Davison SD-Clay SD-Charles Mix SD-Bon Homme SD-Douglas SD-Yankton SD-
Hanson SD-Turner SD-Hutchinson SD-
828 PM CDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHERN DAVISON...WEST CENTRAL CLAY...SOUTHEASTERN CHARLES
MIX...BON HOMME...EASTERN DOUGLAS...YANKTON...SOUTHERN HANSON...
WESTERN TURNER AND HUTCHINSON COUNTIES...

At 827 PM CDT, severe thunderstorms were located along a line
extending from near Clayton to near Springfield, moving east at 50
mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters. A gust to 63 mph was reported at 
         the Fort Randall Dam at 814 pm.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Freeman and Dolton around 845 PM CDT.
  Marion around 855 PM CDT.

Other locations impacted by these severe thunderstorms include
Gayville, Lesterville, Olivet and Yankton Sioux Tribal Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4284 9815 4288 9831 4293 9842 4358 9829
      4352 9761 4350 9761 4348 9717 4280 9715
      4281 9721 4285 9723 4287 9730 4285 9736
      4287 9741 4285 9744 4286 9762 4284 9769
      4287 9785 4277 9794 4276 9803
TIME...MOT...LOC 0127Z 286DEG 44KT 4346 9770 4283 9791 

HAIL...<.75IN
WIND...60MPH
 
$$

Kalin

662 
WWUS53 KFSD 240142
SVSFSD

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

SDC009-023-027-035-043-061-067-125-135-240215-
/O.CON.KFSD.SV.W.0035.000000T0000Z-210624T0215Z/
Davison SD-Clay SD-Charles Mix SD-Bon Homme SD-Douglas SD-Yankton SD-
Hanson SD-Turner SD-Hutchinson SD-
842 PM CDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHERN DAVISON...WEST CENTRAL CLAY...SOUTHEASTERN CHARLES
MIX...BON HOMME...EASTERN DOUGLAS...YANKTON...SOUTHERN HANSON...
WESTERN TURNER AND HUTCHINSON COUNTIES...

At 841 PM CDT, severe thunderstorms were located along a line
extending from near Clayton to 7 miles southeast of Santee, moving
east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters. A gust to 68 mph was reported 
         earlier at the Fort Randall Dam. 

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

These severe storms will be near...
  Freeman and Dolton around 905 PM CDT.
  Marion around 915 PM CDT.

Other locations impacted by these severe thunderstorms include
Gayville, Lesterville, Olivet and Yankton Sioux Tribal Nation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4284 9815 4288 9831 4293 9842 4358 9829
      4352 9761 4350 9761 4348 9717 4280 9715
      4281 9721 4285 9723 4287 9730 4285 9736
      4287 9741 4285 9744 4286 9762 4284 9769
      4287 9785 4277 9794 4276 9803
TIME...MOT...LOC 0141Z 287DEG 34KT 4345 9770 4279 9771 

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

Kalin

813 
WWUS53 KFSD 240215
SVSFSD

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

SDC009-023-027-035-043-061-067-125-135-240224-
/O.EXP.KFSD.SV.W.0035.000000T0000Z-210624T0215Z/
Davison SD-Clay SD-Charles Mix SD-Bon Homme SD-Douglas SD-Yankton SD-
Hanson SD-Turner SD-Hutchinson SD-
915 PM CDT Wed Jun 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN DAVISON...WEST
CENTRAL CLAY...SOUTHEASTERN CHARLES MIX...BON HOMME...EASTERN
DOUGLAS...YANKTON...SOUTHERN HANSON...WESTERN TURNER AND HUTCHINSON
COUNTIES WILL EXPIRE AT 915 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

LAT...LON 4284 9815 4288 9831 4293 9842 4358 9829
      4352 9761 4350 9761 4348 9717 4280 9715
      4281 9721 4285 9723 4287 9730 4285 9736
      4287 9741 4285 9744 4286 9762 4284 9769
      4287 9785 4277 9794 4276 9803
TIME...MOT...LOC 0214Z 286DEG 44KT 4334 9719 4268 9721 

$$

Kalin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 7:12 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	46 min
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, 8:36 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.