Alert archive / South Dakota / Tornado Warnings in 2019

Tornado Warning 24, NWS Sioux Falls, SD

August 17, 2019Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 17, 2019, 6:24 PM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 36 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: Aug 17, 2019, 6:24 PM CDT (23:24 UTC)
Expired: Aug 17, 2019, 7:00 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Charles Mix County, SD, Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 23:26 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 17, 6:28 PM CDT	HAIL 0.7	Pickstown, SD
Aug 17, 6:30 PM CDT	HAIL 1.5	Pickstown, SD	PICTURE RECEIVED VIA SOCIAL MEDIA.

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 17, 6:14 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.4 hours before the alert went out and 205 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: 789 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1386 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

154 
WFUS53 KFSD 172324
TORFSD
SDC023-053-180000-
/O.NEW.KFSD.TO.W.0024.190817T2324Z-190818T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
624 PM CDT Sat Aug 17 2019

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Central Charles Mix County in south central South Dakota...
  Southeastern Gregory County in south central South Dakota...

* Until 700 PM CDT.
    
* At 623 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Pickstown, moving northeast at 15 mph.

  HAZARD...Tornado and half dollar 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 dangerous storm will be near...
  Pickstown around 650 PM CDT.
  Lake Andes around 700 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 4309 9873 4319 9856 4301 9842 4300 9858
      4300 9869
TIME...MOT...LOC 2323Z 242DEG 11KT 4306 9864 

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

$$

JM

2 follow-up statements

672 
WWUS53 KFSD 172339
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
639 PM CDT Sat Aug 17 2019

SDC023-053-180000-
/O.CON.KFSD.TO.W.0024.000000T0000Z-190818T0000Z/
Charles Mix SD-Gregory SD-
639 PM CDT Sat Aug 17 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR CENTRAL
CHARLES MIX AND SOUTHEASTERN GREGORY COUNTIES...
    
At 639 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Pickstown, moving northeast at 15 mph.

HAZARD...Tornado and half dollar 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 dangerous storm will be near...
  Pickstown around 645 PM CDT.
  Lake Andes around 700 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 4309 9871 4319 9856 4301 9842 4300 9857
      4302 9862
TIME...MOT...LOC 2339Z 242DEG 11KT 4308 9858 

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

$$

JM

652 
WWUS53 KFSD 172355
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
655 PM CDT Sat Aug 17 2019

SDC023-053-180004-
/O.EXP.KFSD.TO.W.0024.000000T0000Z-190818T0000Z/
Charles Mix SD-Gregory SD-
655 PM CDT Sat Aug 17 2019

...THE TORNADO WARNING FOR CENTRAL CHARLES MIX AND SOUTHEASTERN
GREGORY COUNTIES WILL EXPIRE AT 700 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

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

LAT...LON 4309 9871 4319 9856 4301 9842 4300 9857
      4302 9862
TIME...MOT...LOC 2354Z 242DEG 11KT 4310 9853 

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 9:57 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	33 min
Aug 16, 10:28 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	32 min
Aug 17, 12:58 AM CDT	Severe Thunderstorm Warning	FSD	Brule	32 min
Aug 17, 1:28 AM CDT	Severe Thunderstorm Warning	FSD	Brule	47 min
Aug 17, 5:32 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory	43 min
Aug 17, 6:16 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	44 min

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.