Alert archive / South Dakota / Tornado Warnings in 2014

Tornado Warning 47, NWS Sioux Falls, SD

August 28, 2014Yankton County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2014, 6:49 PM CDT for Yankton County, South Dakota. It was in force for 26 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 28, 2014, 6:49 PM CDT (23:49 UTC)
Expired: Aug 28, 2014, 7:15 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Observed
Hail: 0.0 in

County Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 70 km from the middle of the area, began a volume at 23:52 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 28, 6:56 PM CDT	TORNADO	2 Wsw Mayfield, SD
Aug 28, 7:08 PM CDT	TORNADO	1 Wsw Mayfield, SD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 213 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: 59 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

213 
WFUS53 KFSD 282349
TORFSD
SDC135-290015-
/O.NEW.KFSD.TO.W.0047.140828T2349Z-140829T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
649 PM CDT THU AUG 28 2014

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN YANKTON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 715 PM CDT

* AT 649 PM CDT...A CONFIRMED TORNADO WAS LOCATED OVER MAYFIELD...OR
  12 MILES NORTH OF YANKTON...MOVING NORTHEAST AT 10 MPH.

  HAZARD...TORNADO. 

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

  IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES. 

* THE TORNADO WILL BE NEAR...
  MAYFIELD AROUND 700 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 IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4308 9744 4317 9729 4317 9722 4316 9717
      4311 9720 4302 9732
TIME...MOT...LOC 2349Z 220DEG 11KT 4306 9735 

TORNADO...OBSERVED
HAIL...0.00IN

$$

CHENARD

1 follow-up statement

367 
WWUS53 KFSD 290001
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
701 PM CDT THU AUG 28 2014

SDC135-290015-
/O.CON.KFSD.TO.W.0047.000000T0000Z-140829T0015Z/
YANKTON SD-
701 PM CDT THU AUG 28 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR NORTH
CENTRAL YANKTON COUNTY...
    
AT 700 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER MAYFIELD...OR 12 MILES NORTH OF YANKTON...MOVING
NORTHEAST AT 5 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES. 

THIS DANGEROUS STORM WILL BE NEAR...
  MAYFIELD 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 IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4306 9740 4314 9734 4310 9726 4304 9733
      4306 9738
TIME...MOT...LOC 0000Z 210DEG 6KT 4307 9735 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CHENARD

Nearby

Tornado Warnings in South Dakota, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.