Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 24, NWS Aberdeen, SD

August 14, 2011Corson County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Aug 14, 2011, 7:48 PM MDT for Corson County, South Dakota. It was in force for 27 min. 3 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 14, 2011, 7:48 PM MDT (01:48 UTC)
Expired
Aug 14, 2011, 8:15 PM MDT
In force
27 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon

County Corson County, SD

The radar

The Bismarck radar (KBIS), 132 km from the middle of the area, began a volume at 01:47 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

TimeReportWhereRemark
Aug 14, 7:55 PM MDTTORNADO2 E Little Eagle, SDBRIEF TOUCHDOWN
Aug 14, 8:00 PM MDTHAIL 13 N Trail City, SDALSO HAD ESTIMATED 40 TO 45 MPH WINDS
Aug 14, 8:10 PM MDTHAIL 0.887 Se Little Eagle, SDALSO RECEIVED 2 INCHES OF RAIN

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

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.8 hours before the alert went out and 132 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, Bismarck Municip, ND at 00:00Z on 2011-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1399 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, Bismarck Municip, ND at 00:00Z on 2011-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.19395878Sfc1 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
1399 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1398 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.2
Supercell composite
7.2

Open this sounding in Storm Lab

The text

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

503 
WFUS53 KABR 150148
TORABR
SDC031-150215-
/O.NEW.KABR.TO.W.0024.110815T0148Z-110815T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
748 PM MDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN CORSON COUNTY IN NORTH CENTRAL SOUTH DAKOTA...

* UNTIL 815 PM MDT

* AT 746 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR LITTLE EAGLE...OR 14 MILES SOUTH OF
  MCLAUGHLIN...AND MOVING SOUTHEAST AT 10 MPH.

* THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF SOUTHEASTERN
  CORSON COUNTY.

THIS WARNING INCLUDES HIGHWAY 12 BETWEEN MILE MARKERS 174 AND 183.

A TORNADO WAS REPORTED 4 MILES NORTHEAST OF LITTLE EAGLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4559 10051 4547 10052 4547 10089 4568 10096
      4569 10068
TIME...MOT...LOC 0148Z 306DEG 8KT 4561 10079

$$
SCARLETT
2 follow-up statements
199 
WWUS53 KABR 150201
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
901 PM CDT SUN AUG 14 2011

SDC031-150215-
/O.CON.KABR.TO.W.0024.000000T0000Z-110815T0215Z/
CORSON SD-
801 PM MDT SUN AUG 14 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CORSON COUNTY
UNTIL 815 PM MDT...

AT 759 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 7 MILES SOUTH OF LITTLE EAGLE...OR 16 MILES WEST OF
MOBRIDGE...MOVING SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHEASTERN CORSON COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4559 10051 4547 10052 4548 10089 4568 10096
      4569 10068
TIME...MOT...LOC 0201Z 320DEG 16KT 4558 10074

$$
SCARLETT
194 
WWUS53 KABR 150207
SVSABR

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
807 PM MDT SUN AUG 14 2011

SDC031-150215-
/O.CON.KABR.TO.W.0024.000000T0000Z-110815T0215Z/
CORSON SD-
807 PM MDT SUN AUG 14 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CORSON COUNTY
UNTIL 815 PM MDT...

AT 803 PM MDT...TRAINED WEATHER SPOTTERS REPORTED NUMEROUS FUNNEL 
CLOUDS WITH THIS STORM.  THIS TORNADO WAS LOCATED 7 MILES SOUTHEAST 
OF LITTLE EAGLE...OR 15 MILES WEST OF MOBRIDGE...MOVING SOUTHEAST AT 
15 MPH. RADAR IS INDICATING THE ROTATION IS GETTING STRONGER AND ANY 
TORNADO WOULD BE RAIN WRAPPED.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHEASTERN CORSON COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. MOVE TO 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.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4559 10051 4547 10052 4548 10089 4568 10096
      4569 10068
TIME...MOT...LOC 0207Z 311DEG 15KT 4558 10071

$$
SCARLETT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 6:26 PM MDTSevere Thunderstorm WarningABRCorson49 min
Aug 14, 7:01 PM MDTSevere Thunderstorm WarningABRCorson59 min
Aug 14, 7:16 PM MDTTornado WarningABRCorson29 min
Aug 14, 8:15 PM MDTTornado WarningABRCorson, Dewey30 min
Aug 14, 8:46 PM MDTSevere Thunderstorm WarningABRCorson, Dewey27 min
Aug 14, 10:01 PM MDTSevere Thunderstorm WarningABRSpink44 min
Aug 14, 10:25 PM MDTSevere Thunderstorm WarningABRDay24 min
Aug 15, 4:06 AM MDTAreal Flood WarningABRRoberts5 days
Aug 15, 9:42 AM MDTFlash Flood WarningABRRoberts7 hr

Nearby

Tornado Warnings in South Dakota, 2011Every tornado warning in 2011Tornadoes in 2011

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.