Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 112, NWS Aberdeen, SD

July 25, 2002Grant County, Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 25, 2002, 1:01 AM CDT for Grant County, Roberts County, South Dakota. It was in force for 44 min. 1 report 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: Jul 25, 2002, 1:01 AM CDT (06:01 UTC)
Expired: Jul 25, 2002, 1:45 AM CDT
In force: 44 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

Counties Grant County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 108 km from the middle of the area, began a volume at 06:03 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

Time	Report	Where	Remark
Jul 25, 1:15 AM CDT	Thunderstorm Wind 52 E	Marvin, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 25, 12:25 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 6.0 hours before the alert went out and 121 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: 2473 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1734 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 14.5

Open this sounding in Storm Lab

The text

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

540 
WUUS53 KABR 250601
SVRABR
SDC051-109-250645-
/NEW.KABR.SV.W.0182.250601-250645/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
101 AM CDT THU JUL 25 2002

THE NATIONAL WEATHER SERVICE IN ABERDEEN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT COUNTY IN NORTHEAST SOUTH DAKOTA
  ROBERTS COUNTY IN NORTHEAST SOUTH DAKOTA

* UNTIL 145 AM CDT

* AT 101 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTHWEST OF RUDEBUSCH CORNER...OR
  ABOUT 15 MILES EAST OF WEBSTER...MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SUMMIT AROUND 110 AM CDT
  PEEVER AROUND 115 AM CDT
  WILMOT...MARVIN AROUND 120 AM CDT
  CORONA...TWIN BROOKS AROUND 125 AM 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 4558 9723 4517 9723 4515 9665 4558 9683

TDK

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, 4 hours 21 minutes earlier.

Area forecast discussion, Jul 24, 8:40 PM CDT, 4 hours 21 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, 3 hours 52 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, 3 hours 1 minute 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

Special weather statement, Jul 24, 11:53 PM CDT, 1 hour 8 minutes before

SDZ003-004-009-015-016-250515-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1153 PM CDT WED JUL 24 2002

...SEVERE THUNDERSTORM WATCH NUMBER 529 CANCELLED...

THUNDERSTORMS CONTINUE TO MOVE EAST ACROSS NORTHEAST SOUTH DAKOTA.
OVER NORTH CENTRAL THE THREAT OF THUNDERSTORMS HAS ENDED...THEREFORE
THE SEVERE THUNDERSTORMS WATCH HAS BEEN CANCELLED IN NORTH CENTRAL
SOUTH DAKOTA.

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, 10:50 PM CDT	Severe Thunderstorm Warning	ABR	Walworth	25 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

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.