Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 109, NWS Aberdeen, SD

July 24, 2002Walworth County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 24, 2002, 10:50 PM CDT for Walworth County, South Dakota. It was in force for 25 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: Jul 24, 2002, 10:50 PM CDT (03:50 UTC)
Expired: Jul 24, 2002, 11:15 PM CDT
In force: 25 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

County Walworth County, SD

The radar

The Aberdeen radar (KABR), 137 km from the middle of the area, began a volume at 03:53 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 24, 10:05 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.8 hours before the alert went out and 150 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: 1695 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1547 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

043 
WUUS53 KABR 250350
SVRABR
SDC129-250415-
/NEW.KABR.SV.W.0179.250350-250415/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
1050 PM CDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WALWORTH COUNTY IN NORTH CENTRAL SOUTH DAKOTA

* UNTIL 1115 PM CDT

* AT 1050 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER INDIAN CREEK REC AREA...OR ABOUT 4 MILES
  EAST OF MOBRIDGE...MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LOWRY AROUND 1115 PM CDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
ABERDEEN.

LAT...LON 4560 10034 4552 10044 4524 9997 4539 9977

KEEFE

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 Jul 24, 8:40 PM CDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jul 24, 8:40 PM CDT, 2 hours 10 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/N-EAST SD AND W-CENTRAL MN
NATIONAL WEATHER SERVICE ABERDEEN SD
840 PM CDT WED JUL 24 2002

INITIAL WAVE OF CONVECTION IS DRIFTING OUT OF THE CWA ATTM WHILE A
SECOND WAVE CONTINUES TO DEVELOP ACROSS NODAK. THIS ASSOCIATED WITH
THE NEXT SHORT WAVE MOVING THROUGH THE NORTHWEST FLOW. SFC BOUNDARY
HAS PROGRESSED THROUGH NW 1/3 OF THE CWA...BUT APPERARS TO BE MAKING
LITTLE ADDITIONAL PROGRESS ATTM. WITH APPROACH OF THE NW SHORT WAVE
THIS BOUNDARY SHOULD BEGIN TO MOVE. TSTMS OVER NODAK MAY BE MORE
ELEVATED IN NATURE...BUT DID NOT RATHER STRONG GUSTY WINDS ACROSS
THE WESTERN PORTION OF THE STATE. WITH THIS ACTIVITY DROPPING SE
WILL MAKE ADJUSTMENTS TO CURRENT ZONE PACKAGE TO INCLUDE CONVECTION
FOR A LONGER PERIOD OF TIME OUT WEST.

.ABR...NONE
FAUCETTE

In the hours before

Local storm report, Jul 24, 9:09 PM CDT, 1 hour 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN, SD
909 PM CDT WED JUL 24 2002

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

0730 PM    PIERRE                    SD   1.00 INCH HAIL
07/24/02   HUGHES

0740 PM    10 NW PIERRE              SD   83 MPH TSTORM WIND
07/24/02   HUGHES                         REPORTED BY ASOS AT PIERRE
                                          REGIONAL AIRPORT

Special weather statement, Jul 24, 10:00 PM CDT, 50 minutes before

SDZ018>020-022-023-250330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1000 PM CDT WED JUL 24 2002

...TORNADO WATCH NUMBER 525 HAS EXPIRED...

THUNDERSTORMS CONTINUE TO DEVELOP WELL TO THE SOUTH AND MOVE EAST OF
EAST CENTRAL SOUTH DAKOTA. WITH THE THREAT OF SEVERE WEATHER
ENDING...THE TORNADO WATCH HAS BEEN ALLOWED TO EXPIRE.

MF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 7:16 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Sully	44 min
Jul 24, 7:37 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	23 min
Jul 24, 7:50 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	40 min
Jul 24, 8:07 PM CDT	Tornado Warning	ABR	Lyman	38 min
Jul 24, 8:52 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	23 min
Jul 24, 10:04 PM CDT	Severe Thunderstorm Warning	ABR	Corson	41 min
Jul 24, 10:42 PM CDT	Severe Thunderstorm Warning	ABR	Campbell	48 min
Jul 24, 11:51 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	39 min
Jul 25, 12:13 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Day, Faulk, Marshall, Spink	62 min
Jul 25, 1:01 AM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	44 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2002 Every severe thunderstorm warning in 2002

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.