Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 50, NWS Sioux Falls, SD

May 7, 2002Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 7, 2002, 3:33 PM CDT for Gregory County, South Dakota. It was in force for 27 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
May 7, 2002, 3:33 PM CDT (20:33 UTC)
Expired
May 7, 2002, 4:00 PM CDT
In force
27 min
Issued by
NWS Sioux Falls, SD
Area
Counties, with a storm outline in the text

County Gregory County, SD

What was reported inside it

TimeReportWhereRemark
May 7, 3:40 PM CDTHail 0.75Gregory, 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.6 hours before the alert went out and 200 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 12:00Z on 2002-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2002-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -93 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
-93 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 072033
SVRFSD
SDC053-072100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
333 PM CDT TUE MAY 7 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREGORY COUNTY IN SOUTH CENTRAL SOUTH DAKOTA

* UNTIL 400 PM CDT

* AT 333 PM CDT...A SEVERE THUNDERSTORM WAS REPORTED OVER GREGORY...
  MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
GREGORY AT 335 PM CDT
RURAL GREGORY COUNTY THROUGH 350 PM CDT

LAT...LON 4308 9951 4302 9882 4347 9928 4349 9951

$$

08

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 3:53 PM CDTSevere Thunderstorm WarningFSDCharles Mix37 min
May 7, 4:23 PM CDTSevere Thunderstorm WarningFSDAurora52 min
May 7, 4:53 PM CDTSevere Thunderstorm WarningFSDSanborn37 min
May 7, 4:58 PM CDTSevere Thunderstorm WarningFSDDavison32 min
May 7, 5:41 PM CDTSevere Thunderstorm WarningFSDAurora34 min
May 7, 6:10 PM CDTSevere Thunderstorm WarningFSDHutchinson35 min
May 7, 6:31 PM CDTSevere Thunderstorm WarningFSDYankton29 min
May 7, 6:39 PM CDTSevere Thunderstorm WarningFSDYankton21 min
May 7, 6:52 PM CDTSevere Thunderstorm WarningFSDTurner38 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.