Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 362, NWS Sioux Falls, SD

August 22, 2002Aurora County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 22, 2002, 12:16 AM CDT for Aurora County, South Dakota. It was in force for 29 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 22, 2002, 12:16 AM CDT (05:16 UTC)
Expired
Aug 22, 2002, 12:45 AM CDT
In force
29 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Aurora County, SD

The radar

The Sioux Falls radar (KFSD), 148 km from the middle of the area, began a volume at 05:17 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 00:00Z, 5.3 hours before the alert went out and 132 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 2002-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 619 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 2002-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
619 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
532 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFSD 220516
SVRFSD
SDC003-220545-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1215 AM CDT THU AUG 22 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  AURORA COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1245 AM CDT

* AT 1215 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 19 MILES NORTHWEST OF MOUNT VERNON...OR ABOUT
  29 MILES WEST OF MITCHELL...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOUNT VERNON AROUND 1240 AM CDT

THIS STORM WILL PRODUCE DAMAGING WIND. GO INSIDE A STURDY BUILDING
AND STAY AWAY FROM WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:45 PM CDTSevere Thunderstorm WarningFSDGregory30 min
Aug 21, 11:35 PM CDTSevere Thunderstorm WarningFSDAurora, Jerauld40 min
Aug 21, 11:41 PM CDTSevere Thunderstorm WarningFSDAurora, Jerauld34 min
Aug 22, 12:19 AM CDTSevere Thunderstorm WarningFSDAurora26 min
Aug 22, 1:04 AM CDTSevere Thunderstorm WarningFSDDavison26 min
Aug 22, 3:25 AM CDTSevere Thunderstorm WarningFSDDouglas35 min
Aug 22, 4:01 AM CDTSevere Thunderstorm WarningFSDHutchinson44 min
Aug 22, 4:40 AM CDTSevere Thunderstorm WarningFSDHutchinson35 min
Aug 22, 6:09 AM CDTSevere Thunderstorm WarningFSDClay, Yankton36 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.