Alert archive / South Dakota / Tornado Warnings in 1987

Tornado Warning 7, NWS Sioux Falls, SD

July 9, 1987Hutchinson County, Turner County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 9, 1987, 9:39 PM CDT for Hutchinson County, Turner County, South Dakota. It was in force for 36 min.

The area

The counties it named.

The facts

Issued: Jul 9, 1987, 9:39 PM CDT (02:39 UTC)
Expired: Jul 9, 1987, 10:15 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Hutchinson County, SD, Turner County, SD

The radar

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

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 2.7 hours before the alert went out and 191 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: 3310 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 21.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 100239 RRA
TORFSD
SDC067-125-100315-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
939 PM CDT THU JUL 9 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 1015 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTHEAST SOUTH DAKOTA
          ...SOUTHEASTERN HUTCHINSON...SOUTHERN TURNER
 
AT 925 PM CDT A TORNADO WAS REPORTED ONE AND ONE-HALF MILES NORTH OF
MENNO OR 35 MILES SOUTHEAST OF SIOUX FALLS. MOVEMENT WAS EAST AT 30
MPH.
 
SOME CITIES INCLUDED IN THIS WARNING ARE...FREEMAN...HURLEY.
 
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 LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
ANDERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix	54 min
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	54 min
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas	53 min
Jul 9, 9:47 PM CDT	Severe Thunderstorm Warning	FSD	Turner	43 min
Jul 9, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	59 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Turner	27 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln	52 min
Jul 10, 12:00 AM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	60 min
Jul 10, 2:06 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	54 min
Jul 10, 6:51 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	54 min
Jul 10, 3:56 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	64 min
Jul 10, 4:05 PM CDT	Tornado Warning	FSD	Mellette	25 min
Jul 10, 4:28 PM CDT	Tornado Warning	FSD	Mellette	32 min
Jul 10, 4:38 PM CDT	Severe Thunderstorm Warning	FSD	Todd	67 min
Jul 10, 4:59 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	61 min
Jul 10, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 min
Jul 10, 6:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 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; the sounding from the Mesonet's radiosonde archive.