Alert archive / South Dakota / Tornado Warnings in 1999

Tornado Warning 9, NWS Sioux Falls, SD

June 4, 1999Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jun 4, 1999, 11:25 PM CDT for Charles Mix County, South Dakota. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 4, 1999, 11:25 PM CDT (04:25 UTC)
Expired: Jun 5, 1999, 12:00 AM CDT
In force: 35 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Charles Mix County, SD

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 4, 11:15 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.4 hours before the alert went out and 189 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: 2271 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1570 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: -7 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -2.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 050428
TORFSD
SDC023-050500-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1125 PM CDT FRI JUN 4 1999

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CHARLES MIX COUNTY IN SOUTH CENTRAL SOUTH DAKOTA

* UNTIL MIDNIGHT CDT

* AT 1125 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 19 MILES SOUTHWEST OF PLATTE...OR ABOUT 8 MILES EAST OF
  BURKE...MOVING NORTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  PLATTE AROUND 1145 PM CDT

DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO STRUCTURE
IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.

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

CHAPMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 10:29 PM CDT	Severe Thunderstorm Warning	FSD	Brule, Gregory	31 min
Jun 4, 11:00 PM CDT	Tornado Warning	FSD	Gregory	45 min
Jun 4, 11:05 PM CDT	Tornado Warning	FSD	Brule	25 min
Jun 4, 11:43 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	47 min
Jun 5, 12:05 AM CDT	Tornado Warning	FSD	Aurora, Jerauld, Sanborn	25 min
Jun 5, 2:08 AM CDT	Severe Thunderstorm Warning	FSD	Brookings	32 min
Jun 5, 4:24 PM CDT	Severe Thunderstorm Warning	FSD	Union	36 min
Jun 5, 4:39 PM CDT	Tornado Warning	FSD	Union	36 min
Jun 5, 5:04 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	41 min
Jun 5, 5:38 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	37 min
Jun 5, 6:05 PM CDT	Severe Thunderstorm Warning	FSD	Turner, Yankton	50 min
Jun 5, 6:21 PM CDT	Severe Thunderstorm Warning	FSD	Union	34 min
Jun 5, 6:27 PM CDT	Tornado Warning	FSD	Union	33 min
Jun 5, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	32 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; the sounding from the Mesonet's radiosonde archive.