Alert archive / South Dakota / Tornado Warnings in 2019

Tornado Warning 18, NWS Sioux Falls, SD

August 9, 2019Gregory County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 9, 2019, 7:03 PM CDT for Gregory County, South Dakota. It was in force for 27 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: Aug 9, 2019, 7:03 PM CDT (00:03 UTC)
Expired: Aug 9, 2019, 7:30 PM CDT
In force: 27 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Gregory County, SD

The radar

The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 00:05 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
Aug 9, 7:10 PM CDT	TSTM WND GUST 61	1 Ese Gregory, SD	LATE REPORT.

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
Aug 9, 2:09 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.1 hours before the alert went out and 217 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

524 
WFUS53 KFSD 100003
TORFSD
SDC053-100030-
/O.NEW.KFSD.TO.W.0018.190810T0003Z-190810T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
703 PM CDT Fri Aug 9 2019

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Southwestern Gregory County in south central South Dakota...

* Until 730 PM CDT.

* At 702 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Dallas, or 23 miles southeast of Winner, moving
  southeast at 30 mph.

  HAZARD...Tornado and half dollar size hail.

  SOURCE...Weather spotters reported funnel cloud.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Gregory around 715 PM CDT
  Burke around 720 PM CDT.
  Herrick around 730 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4306 9953 4332 9953 4313 9904 4300 9918
      4300 9948 4306 9954
TIME...MOT...LOC 0002Z 302DEG 24KT 4318 9948 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Schumacher

3 follow-up statements

152 
WWUS53 KFSD 100008
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
708 PM CDT Fri Aug 9 2019

SDC053-100030-
/O.CON.KFSD.TO.W.0018.000000T0000Z-190810T0030Z/
Gregory SD-
708 PM CDT Fri Aug 9 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHWESTERN GREGORY COUNTY...
    
At 707 PM CDT, a confirmed tornado was located near Dallas, or 20 
miles southeast of Winner, moving southeast at 25 mph.

HAZARD...Damaging tornado and half dollar size hail.

SOURCE...Law enforcement confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornado will be near...
  Gregory around 715 PM CDT.
  Burke around 730 PM CDT.

At 704 PM CDT, Gregory County dispatch reported a tornado between 
Dallas and Gregory.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4306 9953 4332 9953 4313 9904 4300 9918
      4300 9948 4306 9954
TIME...MOT...LOC 0007Z 303DEG 21KT 4321 9951 

TORNADO...OBSERVED
HAIL...1.25IN

$$

Schumacher

055 
WWUS53 KFSD 100015
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
715 PM CDT Fri Aug 9 2019

SDC053-100030-
/O.CON.KFSD.TO.W.0018.000000T0000Z-190810T0030Z/
Gregory SD-
715 PM CDT Fri Aug 9 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHWESTERN GREGORY COUNTY...
    
At 711 PM CDT, a confirmed tornado was located near Gregory, or 24 
miles southeast of Winner, moving southeast at 20 mph. Radar also 
indicated that a second tornado was forming 5 miles south Dallas 
also moving southeast at 20 mph.

HAZARD...Damaging tornado and half dollar size hail.

SOURCE...Law enforcement confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornado will be near...  
  Burke around 720 PM CDT.
  Herrick around 725 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4332 9953 4314 9907 4301 9921 4301 9949
      4306 9954 4306 9953
TIME...MOT...LOC 0011Z 309DEG 19KT 4318 9944 

TORNADO...OBSERVED
HAIL...1.25IN

$$

Schumacher

930 
WWUS53 KFSD 100022
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
722 PM CDT Fri Aug 9 2019

SDC053-100030-
/O.CON.KFSD.TO.W.0018.000000T0000Z-190810T0030Z/
Gregory SD-
722 PM CDT Fri Aug 9 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHWESTERN GREGORY COUNTY...
    
At 721 PM CDT, a severe thunderstorm capable of producing a tornado 
was now located 7 miles south of Gregory, or 25 miles northeast of 
Springview, moving southeast at 30 mph.

HAZARD...Tornado and golf ball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
southwestern Gregory County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4301 9949 4306 9954 4306 9953 4332 9953
      4314 9907 4301 9921
TIME...MOT...LOC 0021Z 317DEG 28KT 4313 9945 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Schumacher

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:29 PM CDT	Tornado Warning	FSD	Gregory	16 min
Aug 9, 7:38 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory, Hutchinson	52 min
Aug 9, 7:47 PM CDT	Tornado Warning	FSD	Gregory	28 min
Aug 9, 7:52 PM CDT	Flash Flood Warning	FSD	Gregory	6 hr
Aug 9, 8:16 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	29 min
Aug 10, 7:07 AM CDT	River Flood Warning	FSD	Charles Mix	12 hr

Nearby

Tornado Warnings in South Dakota, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.