Alert archive / South Dakota / Tornado Warnings in 2011

Tornado Warning 25, NWS Aberdeen, SD

August 14, 2011Corson County, Dewey County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Aug 14, 2011, 8:15 PM MDT for Corson County, Dewey County, South Dakota. It was in force for 30 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 14, 2011, 8:15 PM MDT (02:15 UTC)
Expired
Aug 14, 2011, 8:45 PM MDT
In force
30 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon

Counties Corson County, SD, Dewey County, SD

The radar

The Bismarck radar (KBIS), 142 km from the middle of the area, began a volume at 02:15 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, 8:30 PM MDTFUNNEL CLOUD5 E Trail City, SDFUNNEL CLOUD SPOTTED 15 MILES NW NEAR LITTLE EAGLE...0.70 INCHES RAIN AND PEA HAIL
Aug 14, 8:30 PM MDTHAIL 1.55 Ne Trail City, SDPING PONG BALL SIZE HAIL AND 1.15 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, 2.3 hours before the alert went out and 142 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°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.

401 
WFUS53 KABR 150215
TORABR
SDC031-041-150245-
/O.NEW.KABR.TO.W.0025.110815T0215Z-110815T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
815 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...
  NORTH CENTRAL DEWEY COUNTY IN NORTH CENTRAL SOUTH DAKOTA...

* UNTIL 845 PM MDT

* AT 812 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR TRAIL CITY...OR 14 MILES WEST OF MOBRIDGE...
  AND MOVING SOUTH AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TRAIL CITY.

THIS WARNING INCLUDES HIGHWAY 12 BETWEEN MILE MARKERS 176 AND 181.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4542 10049 4540 10078 4562 10082 4563 10060
TIME...MOT...LOC 0215Z 351DEG 20KT 4552 10071

$$
SCARLETT
2 follow-up statements
936 
WWUS53 KABR 150225
SVSABR

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

SDC031-041-150245-
/O.CON.KABR.TO.W.0025.000000T0000Z-110815T0245Z/
DEWEY SD-CORSON SD-
825 PM MDT SUN AUG 14 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CORSON AND
NORTH CENTRAL DEWEY COUNTIES UNTIL 845 PM MDT...

AT 821 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR TRAIL CITY...OR 13 MILES WEST OF 
MOBRIDGE...MOVING SOUTH AT 25 MPH. PEOPLE IN TRAIL CITY NEED TO TAKE 
COVER NOW!

LOCATIONS IMPACTED INCLUDE...
  TRAIL CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4542 10049 4540 10078 4555 10080 4558 10062
TIME...MOT...LOC 0225Z 351DEG 20KT 4549 10070

$$
SCARLETT
749 
WWUS53 KABR 150248
SVSABR

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

SDC031-041-150257-
/O.EXP.KABR.TO.W.0025.000000T0000Z-110815T0245Z/
DEWEY SD-CORSON SD-
848 PM MDT SUN AUG 14 2011

...THE TORNADO WARNING FOR SOUTHEASTERN CORSON AND NORTH CENTRAL
DEWEY COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE TORNADO WARNING HAS WEAKENED. 
HOWEVER...THIS STORM IS STILL CAPABLE OF PRODUCING STRONG GUSTY 
WINDS UP TO 60 MPH AND HAIL. A SEVERE THUNDERSTORM WARNING IS NOW IN 
EFFECT.

LAT...LON 4542 10049 4540 10078 4555 10080 4558 10062
TIME...MOT...LOC 0225Z 351DEG 20KT 4549 10070

$$
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, 7:48 PM MDTTornado WarningABRCorson27 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.