Alert archive / South Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 264, NWS Sioux Falls, SD

August 11, 2002Aurora County, Davison County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 11, 2002, 9:30 PM CDT for Aurora County, Davison County, South Dakota. It was in force for 30 min. 2 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 11, 2002, 9:30 PM CDT (02:30 UTC)
Expired: Aug 11, 2002, 10:00 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Aurora County, SD, Davison County, SD

The radar

The Sioux Falls radar (KFSD), 132 km from the middle of the area, began a volume at 02:30 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 11, 9:33 PM CDT	Thunderstorm Wind 58 M	(Mhe)Mitchell Arpt, SD	Thunderstorm winds caused tree damage, including several large branches blown down. One branch damaged a pickup truck when it fell. The winds also blew down power lines, resulting in power outages.
Aug 11, 9:40 PM CDT	Thunderstorm Wind 52 E	Stickney, 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
Aug 11, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 128 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: 2317 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 2063 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

384 
WUUS53 KFSD 120230
SVRFSD
SDC003-035-120300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
929 PM CDT SUN AUG 11 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 1000 PM CDT

* AT 929 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 14 MILES NORTH OF PLANKINTON TO
  14 MILES SOUTHWEST OF STICKNEY...OR FROM 22 MILES NORTHWEST OF
  MITCHELL TO 19 MILES NORTH OF LAKE ANDES...MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MOUNT VERNON AROUND 935 PM CDT
  LOOMIS AROUND 950 PM CDT
  MITCHELL AROUND 955 PM CDT
  ETHAN AROUND 1000 PM CDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. WIND GUSTS TO 
70 MPH CAN BE EXPECTED WITH THESE STORMS.  GO INSIDE A STURDY 
BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4392 9851 4374 9849 4350 9865 4350 9798
          4383 9798 4384 9834

SCHUMACHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:58 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	47 min
Aug 11, 8:10 PM CDT	Severe Thunderstorm Warning	FSD	Brule	50 min
Aug 11, 8:28 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	32 min
Aug 11, 8:47 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld	43 min
Aug 11, 8:53 PM CDT	Severe Thunderstorm Warning	FSD	Aurora	37 min
Aug 11, 8:56 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	49 min
Aug 11, 9:00 PM CDT	Severe Thunderstorm Warning	FSD	Brule	15 min
Aug 11, 9:05 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	25 min
Aug 11, 9:36 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Miner	24 min
Aug 11, 10:00 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Douglas	30 min
Aug 11, 10:14 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	46 min
Aug 11, 10:22 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	53 min
Aug 11, 10:49 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	26 min
Aug 11, 11:17 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	43 min
Aug 12, 12:46 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	44 min
Aug 12, 12:53 AM CDT	Severe Thunderstorm Warning	FSD	Clay	37 min
Aug 12, 1:18 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	42 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.