Alert archive / South Dakota / Tornado Warnings in 1987

Tornado Warning 5, NWS Sioux Falls, SD

July 6, 1987Brule County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 6, 1987, 7:12 PM CDT for Brule 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: Jul 6, 1987, 7:12 PM CDT (00:12 UTC)
Expired: Jul 6, 1987, 8:00 PM CDT
In force: 48 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Brule County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 6, 7:15 PM CDT	Hail 1.75	Brule, SD
Jul 6, 7:30 PM CDT	Hail 1.75	Brule, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 0.2 hours before the alert went out and 142 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: 2161 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 1688 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 070012
TORFSD
SDC015-070100-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
712 PM CDT MON JUL 6 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL  800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL SOUTH DAKOTA
          ...WESTERN BRULE
 
SOME CITIES INCLUDED IN THIS WARNING...CHAMBERLAIN.
 
AT 710 PM A TORNADO WAS SIGHTED 2 MILES SOUTH OF CHAMBERLAIN MOVING
EAST NORTHEAST AT 15 MPH.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWESfT FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
JANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:55 PM CDT	Severe Thunderstorm Warning	FSD	Aurora	65 min
Jul 6, 9:34 PM CDT	Severe Thunderstorm Warning	FSD	Davison	26 min
Jul 6, 10:12 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook	48 min
Jul 7, 12:33 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	37 min
Jul 7, 1:01 AM CDT	Tornado Warning	FSD	Union	29 min

Nearby

Tornado Warnings in South Dakota, 1987 Every tornado warning in 1987 Tornadoes in 1987

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.