Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 8, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Jul 10, 1987, 4:05 PM CDT for Mellette County, South Dakota. It was in force for 25 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 10, 1987, 4:05 PM CDT (21:05 UTC)
- Expired
- Jul 10, 1987, 4:30 PM CDT
- In force
- 25 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Mellette 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 10, 4:10 PM CDT | Tornado F0 | Mellette, SD | |
| Jul 10, 4:26 PM CDT | Hail 2.5 | Mellette, 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
Rapid City, SD (KRAP), launched 12:00Z, 9.1 hours before the alert went out and 179 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.
- Mixed-layer CAPE
- 136 J/kg
- Mixed-layer CIN
- -314 J/kg
- Mixed-layer LCL
- 1547 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 102105 RRA
TORFSD
SDC095-102130-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
405 PM CDT FRI JUL 10 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 430 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH CENTRAL SOUTH DAKOTA
...NORTHERN MELLETTE
CITY POSSIBLY EFFECTED IS WHITE RIVER.
AT 403 PM CDT A TORNADO WAS REPORTED NEAR CEDER BUTTE IN NORHTWEST
MELLETTE COUNTY IN SOUTHCENTRAL SOUTH DKAOTA. THE STORM WAS MOVING TO
THE EAST AT 30 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 SH ELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR. USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY. AVOID WINDOWS.
KOSCIELSKIThe 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, 9:39 PM CDT | Tornado Warning | FSD | Hutchinson, Turner | 36 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, 4:28 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, 1987Every tornado warning in 1987Tornadoes 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.