Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 10, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this tornado warning at Aug 5, 1987, 7:01 PM CDT for Brule County, South Dakota. It was in force for 29 min.
The area
The counties it named.
The facts
- Issued
- Aug 5, 1987, 7:01 PM CDT (00:01 UTC)
- Expired
- Aug 5, 1987, 7:30 PM CDT
- In force
- 29 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.
The nearest sounding before it
Aberdeen, SD (KHON), launched 00:00Z, 0.0 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 060001
TORFSD
SDC015-060030-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
701 PM CDT WED AUG 5 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 730 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH CENTRAL SOUTH DAKOTA
...NORTHERN BRULE
AT 655 PM CDT A TORNADO WAS REPORTED 8 MILES WEST OF CHAMBERLAIN
SOUTH DAKOTA MOVING EAST AT 25 MPH.
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, 2 hours 51 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, 7:30 PM CDT | Tornado Warning | FSD | Brule | 60 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; the sounding from the Mesonet's radiosonde archive.