Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 17, NWS Sioux Falls, SD

June 11, 20214 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 11, 2021, 5:04 AM CDT for 4 counties in South Dakota. It was in force for 41 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, 5:04 AM CDT (10:04 UTC)
Expired: Jun 11, 2021, 5:45 AM CDT
In force: 41 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Brookings County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD

The radar

The Sioux Falls radar (KFSD), 79 km from the middle of the area, began a volume at 10:03 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, 5:04 AM CDT	TSTM WND DMG	De Smet, SD	FEW BRANCHES DOWN IN TOWN, INCLUDING ONE 6 TO 8 INCHES IN DIAMETER.

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, 10.1 hours before the alert went out and 122 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.

906 
WUUS53 KFSD 111004
SVRFSD
SDC011-077-079-097-111045-
/O.NEW.KFSD.SV.W.0017.210611T1004Z-210611T1045Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Kingsbury County in east central South Dakota...
  Lake County in east central South Dakota...
  Eastern Miner County in east central South Dakota...
  Western Brookings County in east central South Dakota...

* Until 545 AM CDT.

* At 504 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles south of Willow Lake to 8 miles east of
  Carthage to near Canova, moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Lake Thompson State Recreation Area around 510 AM CDT.
  Oldham around 520 AM CDT.
  Ramona around 525 AM CDT.
  Orland around 530 AM CDT.
  Badger around 535 AM CDT.
  Sinai and Nunda around 540 AM CDT.
  Chester and Oakwood State Park around 545 AM CDT.

Other locations impacted by these severe thunderstorms include Erwin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4421 9688 4385 9689 4385 9763 4420 9762
      4454 9770 4454 9695
TIME...MOT...LOC 1004Z 273DEG 38KT 4453 9762 4420 9755 4387 9756 

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

Schumacher

2 follow-up statements

333 
WWUS53 KFSD 111021
SVSFSD

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

SDC011-077-079-097-111045-
/O.CON.KFSD.SV.W.0017.000000T0000Z-210611T1045Z/
Kingsbury SD-Lake SD-Miner SD-Brookings SD-
521 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR EASTERN KINGSBURY...LAKE...EASTERN MINER AND WESTERN BROOKINGS
COUNTIES...

At 521 AM CDT, severe thunderstorms were located along a line
extending from near Bryant to near Oldham to 7 miles east of Canova,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Ramona and Orland around 530 AM CDT.
  Badger around 535 AM CDT.
  Sinai around 540 AM CDT.
  Nunda around 545 AM CDT.

Other locations impacted by these severe thunderstorms include Erwin.

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 4421 9688 4385 9689 4385 9751 4419 9749
      4454 9757 4454 9695
TIME...MOT...LOC 1021Z 273DEG 38KT 4452 9740 4419 9734 4386 9735 

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

Schumacher

232 
WWUS53 KFSD 111038
SVSFSD

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

SDC011-077-079-097-111047-
/O.EXP.KFSD.SV.W.0017.000000T0000Z-210611T1045Z/
Kingsbury SD-Lake SD-Miner SD-Brookings SD-
538 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN KINGSBURY...LAKE...
EASTERN MINER AND WESTERN BROOKINGS COUNTIES WILL EXPIRE AT 545 AM
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 to 50 mph are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
east central South Dakota.

LAT...LON 4421 9688 4385 9689 4385 9751 4419 9749
      4454 9757 4454 9695
TIME...MOT...LOC 1037Z 273DEG 38KT 4451 9716 4418 9710 4385 9711 

$$

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, 4:59 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	46 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.