Alert archive / South Dakota / Tornado Warnings in 2017

Tornado Warning 29, NWS Sioux Falls, SD

August 13, 2017McCook County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 13, 2017, 6:58 PM CDT for McCook County, South Dakota. It was in force for 17 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: Aug 13, 2017, 6:58 PM CDT (23:58 UTC)
Expired: Aug 13, 2017, 7:15 PM CDT
In force: 17 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County McCook County, SD

The radar

The Sioux Falls radar (KFSD), 41 km from the middle of the area, began a volume at 00:04 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
Aug 13, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	11 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 12.0 hours before the alert went out and 172 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: 308 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 693 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

829 
WFUS53 KFSD 132358
TORFSD
SDC087-140015-
/O.NEW.KFSD.TO.W.0029.170813T2358Z-170814T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
658 PM CDT SUN AUG 13 2017

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Southeastern McCook County in southeastern South Dakota...

* Until 715 PM CDT
    
* At 657 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Canistota, or near Lake Vermillion State
  Recreation Area, moving east at 25 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...
  Lake Vermillion State Recreation Area around 715 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.

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

&&

LAT...LON 4362 9713 4350 9713 4359 9741 4365 9738
TIME...MOT...LOC 2357Z 283DEG 20KT 4360 9732 

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

$$

Ferguson

1 follow-up statement

081 
WWUS53 KFSD 140015
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
715 PM CDT SUN AUG 13 2017

SDC087-140025-
/O.EXP.KFSD.TO.W.0029.000000T0000Z-170814T0015Z/
McCook SD-
715 PM CDT SUN AUG 13 2017

...THE TORNADO WARNING FOR SOUTHEASTERN MCCOOK COUNTY HAS EXPIRED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A severe thunderstorm watch remains in effect until midnight CDT for
southeastern 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 4362 9713 4350 9713 4359 9741 4365 9738
TIME...MOT...LOC 0015Z 283DEG 20KT 4358 9719 

$$

Ferguson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 3:16 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas	44 min
Aug 13, 3:54 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Hutchinson	51 min
Aug 13, 4:20 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	25 min
Aug 13, 4:24 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook, Turner	36 min
Aug 13, 4:39 PM CDT	Tornado Warning	FSD	Bon Homme, Charles Mix	36 min
Aug 13, 5:15 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	30 min
Aug 13, 5:40 PM CDT	Tornado Warning	FSD	Bon Homme, Charles Mix	35 min
Aug 13, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	33 min
Aug 13, 5:52 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	23 min
Aug 13, 6:39 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	21 min
Aug 13, 6:44 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	31 min

Nearby

Tornado Warnings in South Dakota, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.