Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 19, NWS Sioux Falls, SD

June 11, 2021Clay County, Union County, South Dakota; Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 11, 2021, 5:56 AM CDT for Clay County, Union County, South Dakota; Dixon County, Nebraska. It was in force for 49 min. 2 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 11, 2021, 5:56 AM CDT (10:56 UTC)
Expired: Jun 11, 2021, 6:45 AM CDT
In force: 49 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Dixon County, NE, Clay County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 94 km from the middle of the area, began a volume at 10:56 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, 6:14 AM CDT	TSTM WND GST 54	11 Nne Vermillion, SD	MEASURED BY PERSONAL WEATHER STATION. 2 INCH BRANCHES DOWN AS WELL.
Jun 11, 6:26 AM CDT	TSTM WND GST 70	6 E Vermillion, SD	MEASURED BY PERSONAL WEATHER STATION.

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

Omaha, NE (KOAX), launched 00:00Z, 10.9 hours before the alert went out and 161 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: 1135 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 2153 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

683 
WUUS53 KFSD 111056
SVRFSD
NEC051-SDC027-127-111145-
/O.NEW.KFSD.SV.W.0019.210611T1056Z-210611T1145Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Dixon County in northeastern Nebraska...
  Clay County in southeastern South Dakota...
  Union County in southeastern South Dakota...

* Until 645 AM CDT.

* At 556 AM CDT, severe thunderstorms were located along a line
  extending from near Irene to 6 miles south of Mission Hill to near
  Wausa, moving southeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Wakonda around 605 AM CDT.
  Meckling around 610 AM CDT.
  Vermillion and Maskell around 620 AM CDT.
  Beresford and Newcastle around 625 AM CDT.
  Union Grove State Park around 630 AM CDT.
  Elk Point, Alcester, Concord and Dixon In Dixon County around 635 
  AM CDT.
  Ponca and Ponca State Park around 640 AM CDT.
  Wakefield, Jefferson and Allen around 645 AM CDT.

Other locations impacted by these severe thunderstorms include
Waterbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4276 9701 4277 9713 4280 9716 4308 9716
      4308 9669 4304 9651 4298 9652 4296 9650
      4292 9654 4284 9655 4283 9658 4274 9664
      4271 9663 4263 9652 4258 9653 4250 9661
      4252 9663 4252 9672 4227 9674 4226 9700
TIME...MOT...LOC 1056Z 293DEG 41KT 4313 9720 4283 9728 4256 9757 

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

Schumacher

2 follow-up statements

691 
WWUS53 KFSD 111127
SVSFSD

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

NEC051-SDC027-127-111145-
/O.CON.KFSD.SV.W.0019.000000T0000Z-210611T1145Z/
Dixon NE-Clay SD-Union SD-
627 AM CDT Fri Jun 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 AM CDT
FOR DIXON...CLAY AND UNION COUNTIES...

At 625 AM CDT, severe thunderstorms were located along a line
extending from near Beresford to near Newcastle to near Coleridge,
moving southeast 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...
  Newcastle and Union Grove State Park around 630 AM CDT.
  Alcester and Dixon In Dixon County around 635 AM CDT.
  Ponca, Elk Point, Concord and Ponca State Park around 640 AM CDT.
  Allen around 645 AM CDT.

Other locations impacted by these severe thunderstorms include
Waterbury.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4276 9701 4277 9713 4288 9703 4308 9693
      4308 9669 4304 9651 4298 9652 4296 9650
      4292 9654 4284 9655 4283 9658 4274 9664
      4271 9663 4263 9652 4258 9653 4250 9661
      4252 9663 4252 9672 4227 9674 4226 9699
TIME...MOT...LOC 1125Z 293DEG 41KT 4301 9680 4271 9689 4244 9718 

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

Schumacher

178 
WWUS53 KFSD 111143
SVSFSD

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

NEC051-SDC027-127-111151-
/O.EXP.KFSD.SV.W.0019.000000T0000Z-210611T1145Z/
Dixon NE-Clay SD-Union SD-
643 AM CDT Fri Jun 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR DIXON...CLAY AND UNION
COUNTIES WILL EXPIRE AT 645 AM CDT...

The storms which prompted the warning have weakened. 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
northeastern Nebraska...and southeastern South Dakota.

LAT...LON 4276 9701 4277 9713 4288 9703 4308 9693
      4308 9669 4304 9651 4298 9652 4296 9650
      4292 9654 4284 9655 4283 9658 4274 9664
      4271 9663 4263 9652 4258 9653 4250 9661
      4252 9663 4252 9672 4227 9674 4226 9699
TIME...MOT...LOC 1141Z 293DEG 41KT 4294 9658 4264 9667 4237 9696 

$$

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, 5:04 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

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Severe Thunderstorm Warnings in Nebraska, 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.