Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 247, NWS Sioux Falls, SD

August 9, 2002Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 9, 2002, 6:46 PM CDT for Charles Mix County, Gregory County, South Dakota. It was in force for 44 min. 3 reports 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: Aug 9, 2002, 6:46 PM CDT (23:46 UTC)
Expired: Aug 9, 2002, 7:30 PM CDT
In force: 44 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Charles Mix County, SD, Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 153 km from the middle of the area, began a volume at 23:50 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
Aug 9, 6:50 PM CDT	Hail 0.88	Pickstown, SD	Large hail, driven by strong winds, destroyed area crops. The amount of crop damage was not known.
Aug 9, 6:50 PM CDT	Thunderstorm Wind 52 E	Pickstown, SD
Aug 9, 6:50 PM CDT	Hail 0.88	Fairfax, SD	Large hail covered the ground.

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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 9, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.8 hours before the alert went out and 208 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: 20 J/kg
Mixed-layer CIN: -386 J/kg
Mixed-layer LCL: 1144 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: -1 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.

606 
WUUS53 KFSD 092346
SVRFSD
SDC023-053-100030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
646 PM CDT FRI AUG 9 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CHARLES MIX COUNTY IN SOUTH CENTRAL SOUTH DAKOTA
  EXTREME SOUTHEAST GREGORY COUNTY IN SOUTH CENTRAL SOUTH DAKOTA

* UNTIL 730 PM CDT

* AT 646 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTH OF PICKSTOWN...MOVING EAST AT 30
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARTY AROUND 655 PM CDT
  WAGNER AROUND 705 PM CDT
  DANTE AROUND 715 PM CDT

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

LAT...LON 4311 9867 4293 9868 4289 9813 4312 9812

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 5:23 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Jerauld	22 min
Aug 9, 5:27 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	33 min
Aug 9, 5:56 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Sanborn	34 min
Aug 9, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	46 min
Aug 9, 6:11 PM CDT	Tornado Warning	FSD	Davison, Sanborn	34 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.