Alert archive / South Dakota / Tornado Warnings in 2017

Tornado Warning 13, NWS Aberdeen, SD

August 25, 2017Clark County, Codington County, Day County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Aug 25, 2017, 5:47 PM CDT for Clark County, Codington County, Day County, South Dakota. It was in force for 12 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 25, 2017, 5:47 PM CDT (22:47 UTC)
Expired: Aug 25, 2017, 5:59 PM CDT
In force: 12 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Clark County, SD, Codington County, SD, Day County, SD

The radar

The Aberdeen radar (KABR), 84 km from the middle of the area, began a volume at 22:49 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 25, 3:38 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.8 hours before the alert went out and 78 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: 742 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

956 
WFUS53 KABR 252247
TORABR
SDC025-029-037-252315-
/O.NEW.KABR.TO.W.0013.170825T2247Z-170825T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Aberdeen SD
547 PM CDT FRI AUG 25 2017

The National Weather Service in Aberdeen has issued a

* Tornado Warning for...
  Southeastern Day County in northeastern South Dakota...
  Northeastern Clark County in northeastern South Dakota...
  Northwestern Codington County in northeastern South Dakota...

* Until 615 PM CDT
    
* At 546 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Swan Lake, or 14 miles south of Webster, moving
  east at 55 mph.

  HAZARD...Tornado. 

  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...
  Grass Lake around 555 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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4508 9760 4516 9759 4518 9725 4507 9724
TIME...MOT...LOC 2246Z 270DEG 49KT 4513 9750 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Scarlett

1 follow-up statement

296 
WWUS53 KABR 252259
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
559 PM CDT FRI AUG 25 2017

SDC025-029-037-252309-
/O.CAN.KABR.TO.W.0013.000000T0000Z-170825T2315Z/
Day SD-Clark SD-Codington SD-
559 PM CDT FRI AUG 25 2017

...THE TORNADO WARNING FOR SOUTHEASTERN DAY...NORTHEASTERN CLARK AND
NORTHWESTERN CODINGTON COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.  

A severe thunderstorm watch remains in effect until 1100 PM CDT for
northeastern South Dakota.

LAT...LON 4508 9760 4516 9759 4518 9725 4507 9724
TIME...MOT...LOC 2257Z 270DEG 49KT 4513 9724 

$$

Scarlett

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 10:42 AM CDT	Special Weather Statement	ABR	Dewey	48 min
Aug 25, 2:27 PM CDT	Special Weather Statement	ABR	Edmunds, Faulk, Potter, Sully	48 min
Aug 25, 3:01 PM CDT	Special Weather Statement	ABR	Faulk, Potter	44 min
Aug 25, 3:14 PM CDT	Severe Thunderstorm Warning	ABR	Potter, Sully	46 min
Aug 25, 3:23 PM CDT	Severe Thunderstorm Warning	ABR	Faulk	52 min
Aug 25, 4:35 PM CDT	Special Weather Statement	ABR	Spink	40 min
Aug 25, 4:44 PM CDT	Special Weather Statement	ABR	Hand	46 min
Aug 25, 5:14 PM CDT	Special Weather Statement	ABR	Clark	46 min
Aug 25, 5:23 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Codington, Day	52 min
Aug 25, 5:47 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	43 min
Aug 25, 6:03 PM CDT	Severe Thunderstorm Warning	ABR	Codington, Day, Deuel, Grant	42 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.