Alert archive / South Dakota / Tornado Warnings in 1999

Tornado Warning 21, NWS Sioux Falls, SD

June 7, 1999Aurora County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jun 7, 1999, 9:12 PM CDT for Aurora County, South Dakota. It was in force for 48 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 7, 1999, 9:12 PM CDT (02:12 UTC)
Expired: Jun 7, 1999, 10:00 PM CDT
In force: 48 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Aurora County, SD

What was reported inside it

Time	Report	Where	Remark
Jun 7, 9:22 PM CDT	Tornado F0	Stickney, SD
Jun 7, 9:23 PM CDT	Tornado F0	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
Jun 7, 6:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.2 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-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: 868 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1677 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 103 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.

000 
TTAA00 KFSD 080212 RRA
TORFSD
SDC003-080300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
912 PM CDT MON JUN 7 1999

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  AURORA COUNTY IN SOUTH CENTRAL SOUTH DAKOTA

* UNTIL 1000 PM CDT

* AT 912 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 10 MILES WEST OF STICKNEY...OR ABOUT 13 MILES SOUTHWEST OF
  PLANKINTON...MOVING EAST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
  STICKNEY AROUND 925 PM CDT

THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING
SITUATION. IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER
IMMEDIATELY. GO TO THE BASEMENT. IF A BASEMENT IS NOT AVAILABLE...GO
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN SIOUX FALLS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 7:40 PM CDT	Severe Thunderstorm Warning	FSD	Brule	50 min
Jun 7, 7:50 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	25 min
Jun 7, 8:09 PM CDT	Tornado Warning	FSD	Brule, Charles Mix	36 min
Jun 7, 8:39 PM CDT	Tornado Warning	FSD	Aurora	36 min
Jun 7, 8:45 PM CDT	Severe Thunderstorm Warning	FSD	Brule	45 min
Jun 7, 9:08 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury	52 min
Jun 7, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Charles Mix, Gregory	44 min
Jun 7, 9:24 PM CDT	Tornado Warning	FSD	Davison	51 min
Jun 7, 10:06 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	39 min
Jun 7, 10:13 PM CDT	Severe Thunderstorm Warning	FSD	Davison	47 min
Jun 7, 10:18 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	42 min
Jun 7, 10:22 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	53 min
Jun 7, 10:26 PM CDT	Tornado Warning	FSD	McCook	49 min
Jun 7, 10:35 PM CDT	Severe Thunderstorm Warning	FSD	Miner	40 min
Jun 7, 10:40 PM CDT	Tornado Warning	FSD	Lake, Miner	50 min
Jun 7, 10:43 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	47 min
Jun 7, 10:48 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Turner	57 min
Jun 7, 11:10 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	35 min
Jun 7, 11:13 PM CDT	Severe Thunderstorm Warning	FSD	McCook	32 min
Jun 7, 11:33 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	42 min
Jun 8, 1:41 AM CDT	Severe Thunderstorm Warning	FSD	Hanson	34 min
Jun 8, 1:57 AM CDT	Tornado Warning	FSD	Hanson, McCook, Miner	33 min
Jun 8, 2:17 AM CDT	Severe Thunderstorm Warning	FSD	Lake	28 min
Jun 8, 2:41 AM CDT	Severe Thunderstorm Warning	FSD	Lake	34 min

Nearby

Tornado Warnings in South Dakota, 1999 Every tornado warning in 1999 Tornadoes in 1999

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.