Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 177, NWS Sioux Falls, SD

July 24, 2002Sanborn County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 24, 2002, 7:17 PM CDT for Sanborn County, South Dakota. It was in force for 13 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, 7:17 PM CDT (00:17 UTC)
Expired
Jul 24, 2002, 7:30 PM CDT
In force
13 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

County Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 108 km from the middle of the area, began a volume at 00:19 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 watch it was issued in

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

IssuedProductOfficeLasted
Jul 24, 4:50 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.3 hours before the alert went out and 116 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, Aberdeen, SD at 00:00Z on 2002-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2473 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, Aberdeen, SD at 00:00Z on 2002-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
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.

590 
WUUS53 KFSD 250017
SVRFSD
SDC111-250030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
716 PM CDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN SANBORN COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 730 PM CDT

* AT 716 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF LETCHER...OR ABOUT 9 
  MILES NORTH OF MITCHELL...MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL SANBORN COUNTY THROUGH 730 PM CDT

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

A TORNADO WATCH IS ALSO IN EFFECT FOR THE AREA. SEVERE THUNDERSTORMS
CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR
SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 4394 9806 4385 9812 4385 9788 4391 9787

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 7:05 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson40 min
Jul 24, 7:21 PM CDTSevere Thunderstorm WarningFSDMiner39 min
Jul 24, 7:36 PM CDTSevere Thunderstorm WarningFSDMcCook39 min
Jul 24, 7:46 PM CDTSevere Thunderstorm WarningFSDDavison, Hanson29 min
Jul 24, 7:52 PM CDTTornado WarningFSDMcCook23 min
Jul 24, 8:04 PM CDTSevere Thunderstorm WarningFSDTurner56 min
Jul 24, 8:11 PM CDTSevere Thunderstorm WarningFSDMinnehaha34 min
Jul 24, 8:14 PM CDTSevere Thunderstorm WarningFSDMcCook31 min
Jul 24, 8:21 PM CDTSevere Thunderstorm WarningFSDHutchinson24 min
Jul 24, 8:22 PM CDTSevere Thunderstorm WarningFSDLincoln53 min
Jul 24, 8:24 PM CDTSevere Thunderstorm WarningFSDClay, Yankton36 min
Jul 24, 8:46 PM CDTSevere Thunderstorm WarningFSDMinnehaha44 min
Jul 24, 8:51 PM CDTSevere Thunderstorm WarningFSDBrule24 min
Jul 24, 9:06 PM CDTSevere Thunderstorm WarningFSDYankton24 min
Jul 24, 9:15 PM CDTSevere Thunderstorm WarningFSDBrule, Charles Mix30 min
Jul 24, 9:43 PM CDTSevere Thunderstorm WarningFSDCharles Mix47 min
Jul 24, 10:23 PM CDTSevere Thunderstorm WarningFSDCharles Mix37 min
Jul 24, 10:57 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix33 min
Jul 25, 1:38 AM CDTSevere Thunderstorm WarningFSDUnion27 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2002Every 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.