Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 138, NWS Sioux Falls, SD

July 9, 2002Brule County, Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 2002, 7:51 PM CDT for Brule County, Charles Mix County, South Dakota. It was in force for 39 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: Jul 9, 2002, 7:51 PM CDT (00:51 UTC)
Expired: Jul 9, 2002, 8:30 PM CDT
In force: 39 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Brule County, SD, Charles Mix County, SD

The radar

The Sioux Falls radar (KFSD), 187 km from the middle of the area, began a volume at 00:53 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
Jul 9, 8:00 PM CDT	Hail 1.5	Academy, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 9, 6:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.9 hours before the alert went out and 163 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: 1791 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

377 
WUUS53 KFSD 100051
SVRFSD
SDC015-023-100130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
751 PM CDT TUE JUL 9 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 830 PM CDT

* AT 751 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 17 MILES NORTHWEST OF PLATTE...OR ABOUT 23
  MILES SOUTH OF CHAMBERLAIN...MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PLATTE AROUND 820 PM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 58 MPH...LARGE HAIL...HEAVY RAINS AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 4359 9928 4341 9915 4337 9874 4359 9881

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:21 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	39 min
Jul 9, 8:59 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	46 min
Jul 9, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	44 min
Jul 9, 9:28 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	32 min
Jul 9, 9:42 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	48 min
Jul 9, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	27 min
Jul 9, 10:00 PM CDT	Severe Thunderstorm Warning	FSD	Turner	45 min
Jul 9, 10:13 PM CDT	Severe Thunderstorm Warning	FSD	McCook	47 min
Jul 10, 1:10 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	35 min
Jul 10, 1:36 AM CDT	Severe Thunderstorm Warning	FSD	Yankton	24 min
Jul 10, 3:03 AM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	87 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.