Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 16, NWS Sioux Falls, SD

June 11, 2021Bon Homme County, Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 11, 2021, 4:59 AM CDT for Bon Homme County, Charles Mix County, South Dakota. It was in force for 46 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 11, 2021, 4:59 AM CDT (09:59 UTC)
Expired: Jun 11, 2021, 5:45 AM CDT
In force: 46 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

The radar

The Sioux Falls radar (KFSD), 127 km from the middle of the area, began a volume at 09:59 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 11, 5:03 AM CDT	TSTM WND DMG	3 Se Avon, SD	PHOTO VIA SOCIAL MEDIA OF PART OF A TREE BLOWN DOWN. ALSO REPORTED PEA SIZED HAIL AND TOTAL OF 1.75 INCHES OF RAIN. TIME ESTIMATED FROM RADAR.

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.

Issued	Product	Office	Lasted
Jun 11, 2:15 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 10.0 hours before the alert went out and 218 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: 1337 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 2725 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

064 
WUUS53 KFSD 110959
SVRFSD
SDC009-023-111045-
/O.NEW.KFSD.SV.W.0016.210611T0959Z-210611T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
459 AM CDT Fri Jun 11 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Charles Mix County in south central South Dakota...
  Bon Homme County in southeastern South Dakota...

* Until 545 AM CDT.

* At 459 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles southeast of Delmont to near Dante to near
  Gross, moving southeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Avon around 510 AM CDT.
  Tyndall around 525 AM CDT.
  Springfield around 530 AM CDT.
  Tabor around 540 AM CDT.

Other locations impacted by these severe thunderstorms include
southeastern 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 4295 9847 4297 9848
      4303 9828 4321 9815 4319 9808 4317 9808
      4317 9781 4311 9764 4285 9764 4285 9777
      4287 9785 4286 9787 4278 9793 4276 9803
TIME...MOT...LOC 0959Z 300DEG 34KT 4318 9809 4301 9822 4294 9849 

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

Schumacher

2 follow-up statements

354 
WWUS53 KFSD 111006
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
506 AM CDT Fri Jun 11 2021

SDC009-023-111045-
/O.CON.KFSD.SV.W.0016.000000T0000Z-210611T1045Z/
Charles Mix SD-Bon Homme SD-
506 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR SOUTHEASTERN CHARLES MIX AND BON HOMME COUNTIES...

At 506 AM CDT, severe thunderstorms were located along a line
extending from near Tripp to near Avon to near Lynch, moving
southeast 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.

These severe storms will be near...
  Avon around 510 AM CDT.
  Tyndall around 525 AM CDT.
  Springfield around 530 AM CDT.
  Tabor around 540 AM CDT.

Other locations impacted by these severe thunderstorms include
southeastern 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 4295 9847 4297 9848
      4303 9828 4321 9815 4319 9808 4317 9808
      4317 9781 4311 9764 4285 9764 4285 9777
      4287 9785 4286 9787 4278 9793 4276 9803
TIME...MOT...LOC 1006Z 300DEG 34KT 4315 9801 4298 9814 4291 9841 

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

Schumacher

678 
WWUS53 KFSD 111030
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
530 AM CDT Fri Jun 11 2021

SDC009-023-111045-
/O.CON.KFSD.SV.W.0016.000000T0000Z-210611T1045Z/
Charles Mix SD-Bon Homme SD-
530 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR SOUTHEASTERN CHARLES MIX AND BON HOMME COUNTIES...

At 529 AM CDT, severe thunderstorms were located along a line
extending from 6 miles northeast of Tyndall to near Santee to 6 miles
west of Springfield to 8 miles northwest of Niobrara, moving
southeast 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.

These severe storms will be near...
  Springfield around 540 AM CDT.
  Tabor around 545 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4284 9815 4288 9827 4316 9804 4313 9781
      4311 9764 4285 9764 4285 9777 4287 9785
      4286 9787 4278 9793 4276 9803
TIME...MOT...LOC 1029Z 315DEG 31KT 4305 9777 4290 9783 4287 9802 4281
9818

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

Schumacher

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 3:13 AM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	47 min
Jun 11, 3:26 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	64 min
Jun 11, 3:39 AM CDT	Severe Thunderstorm Warning	FSD	Aurora, Charles Mix, Douglas, Gregory	51 min
Jun 11, 5:04 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Miner	41 min
Jun 11, 5:41 AM CDT	Severe Thunderstorm Warning	FSD	Yankton	34 min
Jun 11, 5:56 AM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	49 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.