Alert archive / South Dakota / Tornado Warnings in 2014

Tornado Warning 48, NWS Sioux Falls, SD

August 28, 2014Yankton County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2014, 7:15 PM CDT for Yankton County, South Dakota. It was in force for 45 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 28, 2014, 7:15 PM CDT (00:15 UTC)
Expired
Aug 28, 2014, 8:00 PM CDT
In force
45 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 00:16 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.3 hours before the alert went out and 212 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2014-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 581 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2014-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
581 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
1173 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.4

Open this sounding in Storm Lab

The text

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

658 
WFUS53 KFSD 290015
TORFSD
SDC135-290100-
/O.NEW.KFSD.TO.W.0048.140829T0015Z-140829T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
715 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 800 PM CDT
    
* AT 714 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER MAYFIELD...OR 14 MILES NORTH OF YANKTON...
  MOVING NORTHEAST AT 15 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

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

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  NORTHEASTERN YANKTON 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 IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4306 9731 4309 9738 4316 9728 4312 9723
      4308 9727
TIME...MOT...LOC 0014Z 219DEG 11KT 4309 9732 

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

$$

CHENARD
2 follow-up statements
533 
WWUS53 KFSD 290035
SVSFSD

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

SDC135-290100-
/O.CON.KFSD.TO.W.0048.000000T0000Z-140829T0100Z/
YANKTON SD-
735 PM CDT THU AUG 28 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
NORTHEASTERN YANKTON COUNTY...
    
AT 735 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER MAYFIELD...OR 15 MILES NORTH OF YANKTON...MOVING
NORTHEAST AT 5 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

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

LOCATIONS IMPACTED INCLUDE...
MAYFIELD.

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 4307 9730 4310 9734 4316 9728 4312 9723
      4308 9727 4307 9729
TIME...MOT...LOC 0035Z 221DEG 5KT 4311 9728 

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

$$

CHENARD
477 
WWUS53 KFSD 290057
SVSFSD

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

SDC135-290103-
/O.EXP.KFSD.TO.W.0048.000000T0000Z-140829T0100Z/
YANKTON SD-
757 PM CDT THU AUG 28 2014

...THE TORNADO WARNING FOR NORTHEASTERN YANKTON COUNTY WILL EXPIRE AT
800 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO. STORM 
SPOTTERS HAVE REPORTED CONTINUED ROTATION WITH THIS STORM...HOWEVER 
NO FUNNEL CLOUD OR TORNADO HAS RECENTLY BEEN REPORTED. THEREFORE THE 
WARNING WILL BE ALLOWED TO EXPIRE...BUT STAY ALERT FOR ANY FUTURE 
WARNINGS.
 
LAT...LON 4307 9730 4310 9734 4316 9728 4312 9723
      4308 9727 4307 9729
TIME...MOT...LOC 0051Z 219DEG 11KT 4311 9728 

$$

CHENARD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 8:11 PM CDTTornado WarningFSDTurner, Yankton28 min

Nearby

Tornado Warnings in South Dakota, 2014Every tornado warning in 2014Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.