Alert archive / South Dakota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 49, NWS Sioux Falls, SD

June 8, 2018Aurora County, Brule County, Jerauld County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 8, 2018, 10:09 PM CDT for Aurora County, Brule County, Jerauld County, South Dakota. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 8, 2018, 10:09 PM CDT (03:09 UTC)
Expired: Jun 8, 2018, 11:00 PM CDT
In force: 51 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Aurora County, SD, Brule County, SD, Jerauld County, SD

The radar

The Sioux Falls radar (KFSD), 173 km from the middle of the area, began a volume at 03:09 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.

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 8, 5:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.2 hours before the alert went out and 117 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: 755 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 2119 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

215 
WUUS53 KFSD 090309
SVRFSD
SDC003-015-073-090400-
/O.NEW.KFSD.SV.W.0049.180609T0309Z-180609T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1009 PM CDT FRI JUN 8 2018

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Aurora County in south central South Dakota...
  Jerauld County in central South Dakota...
  Eastern Brule County in south central South Dakota...

* Until 1100 PM CDT.

* At 1008 PM CDT, severe thunderstorms were located along a line
  extending from Etbauer Hill to 6 miles south of Gann Valley to near
  Kimball to 6 miles southwest of Grass Ranch Colony, moving east at
  35 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  White Lake around 1025 PM CDT.
  Plankinton and Wessington Springs around 1045 PM CDT.
  Lane and Storla around 1055 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION. These storms have a 
history of producing wind damage. SEEK SHELTER NOW inside a sturdy 
structure and stay away from windows!

&&

LAT...LON 4394 9893 4415 9893 4420 9856 4407 9833
      4362 9833 4353 9911 4367 9903 4391 9910
      4393 9912
TIME...MOT...LOC 0308Z 257DEG 32KT 4408 9915 4395 9898 4370 9891 4359
9898

HAIL...<.75IN
WIND...70MPH
 
$$

Hanko

2 follow-up statements

204 
WWUS53 KFSD 090337
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1037 PM CDT FRI JUN 8 2018

SDC003-015-073-090400-
/O.CON.KFSD.SV.W.0049.000000T0000Z-180609T0400Z/
Aurora SD-Jerauld SD-Brule SD-
1037 PM CDT FRI JUN 8 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR AURORA...JERAULD AND NORTHEASTERN BRULE COUNTIES...

At 1037 PM CDT, severe thunderstorms were located along a line
extending from 8 miles northeast of Gann Valley to 9 miles southwest
of Wessington Springs to near White Lake to 7 miles northwest of
Aurora Center, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Plankinton and Wessington Springs around 1050 PM CDT.
  Lane and Storla around 1100 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4393 9893 4415 9893 4420 9856 4407 9833
      4362 9833 4357 9886
TIME...MOT...LOC 0337Z 254DEG 26KT 4410 9886 4397 9869 4372 9862 4361
9869

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

Hanko

384 
WWUS53 KFSD 090353
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1053 PM CDT FRI JUN 8 2018

SDC003-015-073-090402-
/O.EXP.KFSD.SV.W.0049.000000T0000Z-180609T0400Z/
Aurora SD-Jerauld SD-Brule SD-
1053 PM CDT FRI JUN 8 2018

...THE SEVERE THUNDERSTORM WARNING FOR AURORA...JERAULD AND
NORTHEASTERN BRULE COUNTIES WILL EXPIRE AT 1100 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.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
south central, central and east central South Dakota.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.

LAT...LON 4393 9893 4415 9893 4420 9856 4407 9833
      4362 9833 4357 9886
TIME...MOT...LOC 0352Z 270DEG 32KT 4413 9868 4400 9851 4375 9844 4364
9851

$$

Hanko

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 9:18 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	57 min
Jun 8, 10:35 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas, Gregory	55 min
Jun 9, 12:10 AM CDT	Severe Thunderstorm Warning	FSD	Douglas, Hutchinson	50 min
Jun 9, 12:37 AM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson	38 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2018 Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.