Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 11, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 5, 1987, 7:30 PM CDT for Brule County, South Dakota. It was in force for 60 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
- Aug 5, 1987, 7:30 PM CDT (00:30 UTC)
- Expired
- Aug 5, 1987, 8:30 PM CDT
- In force
- 60 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 |
|---|---|---|---|
| Aug 5, 8:09 PM CDT | Thunderstorm Wind 53 | Brule, SD | |
| Aug 5, 8:20 PM CDT | Hail 2.75 | 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, 0.5 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.
- Mixed-layer CAPE
- 1188 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 1877 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 060030
TORFSD
SDC015-060130-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
730 PM CDT WED AUG 5 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 830 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH CENTRAL SOUTH DAKOTA
...BRULE
AT 725 PM CDT TORNADOES WERE REPORTED 12 MILES WEST OF CHAMBERLAIN
SOUTH DAKOTA MOVING EASTSOUTHEAST AT 15 MPH.
CITIES INCLUDED IN THIS TORNADO WARNING ARE CHAMBERLAIN AND PUKWANA
SOUTH DAKOTA.
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
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.
THEOPHILUSWhat forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 5, 4:10 PM CDT, 3 hours 20 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HURON SD 405 PM CDT WED AUG 5 1987 ...THUNDERSTORMS HAVE BEGUN DEVELOPING OVER CENTRAL SOUTH DAKOTA... AT 4 PM CDT...INTENSE THUYNDERSTORMS HAD DEVELOPED OVER CENTRAL SOUTH DAKOTA 25 AND 35 MILES NORTHWEST OF PIERRE. VERY HEAVY RAIN...STRONG WIND...AND HAIL IS LIKELY WITH THESE STORMS. MOVEMENT WAS EAST AT 25 MILES AN HOUR. SPRINGER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 7:01 PM CDT | Tornado Warning | FSD | Brule | 29 min |
| Aug 5, 8:12 PM CDT | Severe Thunderstorm Warning | FSD | Gregory, Tripp | 63 min |
| Aug 5, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Aurora, Brule, Charles Mix | 63 min |
| Aug 5, 9:15 PM CDT | Severe Thunderstorm Warning | FSD | Charles Mix, Gregory, Tripp | 60 min |
| Aug 5, 10:09 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Turner | 66 min |
| Aug 5, 10:27 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 63 min |
| Aug 5, 10:27 PM CDT | Severe Thunderstorm Warning | FSD | Douglas | 63 min |
| Aug 5, 11:26 PM CDT | Severe Thunderstorm Warning | FSD | Yankton | 34 min |
| Aug 5, 11:57 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 33 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.