Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 342, NWS Sioux Falls, SD

October 9, 2001Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Oct 9, 2001, 7:38 PM CDT for Charles Mix County, South Dakota. It was in force for 22 min. 3 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Oct 9, 2001, 7:38 PM CDT (00:38 UTC)
Expired: Oct 9, 2001, 8:00 PM CDT
In force: 22 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Charles Mix County, SD

The radar

The Sioux Falls radar (KFSD), 144 km from the middle of the area, began a volume at 00:39 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
Oct 9, 7:47 PM CDT	Hail 0.75	Ravinia, SD
Oct 9, 7:52 PM CDT	Hail 1.5	Ravinia, SD
Oct 9, 8:02 PM CDT	Hail 1.5	Ravinia, 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 00:00Z, 0.6 hours before the alert went out and 195 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: 7 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

559 
WUUS53 KFSD 100039
SVRFSD
SDC023-100100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
738 PM CDT TUE OCT 9 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 800 PM CDT

* AT 738 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER RAVINIA...OR ABOUT 6 MILES NORTHEAST OF
  PICKSTOWN...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN IN RURAL CHARLES MIX COUNTY. 

THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

LAT...LON 4314 9857 4300 9841 4317 9814 4326 9834

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 7:55 PM CDT	Severe Thunderstorm Warning	FSD	Douglas	35 min
Oct 9, 8:00 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	15 min
Oct 9, 8:12 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, McCook	33 min
Oct 9, 8:20 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	25 min
Oct 9, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	32 min
Oct 9, 9:20 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	25 min
Oct 9, 9:39 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	36 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

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.