Alert archive / South Dakota / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 189, NWS Aberdeen, SD

August 20, 2003Spink County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 20, 2003, 5:56 PM CDT for Spink County, South Dakota. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 20, 2003, 5:56 PM CDT (22:56 UTC)
Expired: Aug 20, 2003, 6:30 PM CDT
In force: 34 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

County Spink County, SD

The radar

The Aberdeen radar (KABR), 58 km from the middle of the area, began a volume at 22:59 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

Aberdeen, SD (KABR), launched 12:00Z, 10.9 hours before the alert went out and 6 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: 3 J/kg
Mixed-layer CIN: -318 J/kg
Mixed-layer LCL: 1269 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 2:40 PM CDT, 3 hours 16 minutes earlier.

Area forecast discussion, Aug 20, 2:40 PM CDT, 3 hours 16 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
240 PM CDT WED AUG 20 2003

.SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT
WEAK COLD FRONT ENTERING WESTERN ZONES AS UPPER LOW EXITS NORTHEAST
ZONES.  EXPECT FRONT TO BE MOSTLY DRY THOUGH A STRAY... LESS THAN 10
POP... SHOWER IS POSSIBLE.  FRONT WILL MOVE THROUGH CWA OVERNIGHT.
DIRTY UPPER RIDGE REBOUNDS WITH ASSOCIATED SURFACE HIGH IN THE COLD
POOL BEHIND FRONT.  MODELS SHOW FAIRLY CLOSE AGREEMENT WITH
PATTERN.  WEAK UPPER LEVEL SHORTWAVES ROTATE OVER AND FLATTEN THE
RIDGE AT INTERVALS THROUGH THE PERIOD.  EXPECT SOME LOW QPF AND LOW
POP SHOWERS TO DEVELOP OVER THE WESTERN ZONES LATE SATURDAY.  COOLER
AIR MASS WILL ALLOW TEMPERATURES WILL APPROACH NORMAL WITH WARMER
POCKETS POSSIBLE IN WESTERN AREAS.  MCNULTY

.LONG TERM...SUNDAY THROUGH WEDNESDAY
LATEST CYCLE OF EXTENDED MODELS TO CHOOSE FROM SUPPORT A SIMILAR
PATTERN EVOLUTION. ON DAY 4...AN UPPER LEVEL LOW...NOW OVER THE
EASTERN PAC...WILL PROPAGATE THROUGH NORTHERN TIER STATES AND DRAG A
COLD FRONT THROUGH THIS AREA. THE COLD FRONT SHOULD HELP TO
REINFORCE COOLER...MORE NORMAL TEMPS FOR THIS TIME OF YEAR AS WELL
AS DRIER AIR. SOMEWHAT MORE ZONAL FLOW DOES TAKE SHAPE FOR BEGINNING
OF NEXT WEEK...BUT FOR HOW LONG IS THE QUESTION. TYPICALLY IN
FASTER...MORE ZONAL SCENARIOS...S/WS AND FROPAS ARE A BIT QUICKER
AND DRIER...SO HAVE REMOVED THE CHANCES PREVIOUSLY INSERTED FOR
MONDAY AND TUESDAY FOR NOW. THIS IN CONJUNCTION WITH HPC AND
SURROUNDING WEATHER OFFICES. STEERED MAX T VALUE ON DAY 4 A BIT
ABOVE ALL FORMS OF GUIDANCE AS FROPA IS EXPECTED LATER IN THAT
PERIOD. TEMPS FOR DAYS 5 THROUGH 7 WERE KEPT CLOSER TO MEX ENSEMBLES
MOS AND HPC GUIDANCE.  DORN

.ABR...NONE

In the hours before

Local storm report, Aug 20, 5:18 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
0518 PM CDT WED AUG 20 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0445 PM    13 E HILLSVIEW            SD   1.25 IN HAIL
08/20/03   MCPHERSON

NDM

Local storm report, Aug 20, 5:53 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
0553 PM CDT WED AUG 20 2003

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0540 PM    5 N ASHTON                SD   0.75 IN HAIL
08/20/03   SPINK

NWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 4:37 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, McPherson	38 min
Aug 20, 5:33 PM CDT	Severe Thunderstorm Warning	ABR	Spink	27 min
Aug 20, 6:19 PM CDT	Severe Thunderstorm Warning	ABR	Clark	41 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2003 Every severe thunderstorm warning in 2003

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.