Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 6, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Jul 6, 1987, 6:35 PM CDT for Lyman 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 6, 1987, 6:35 PM CDT (23:35 UTC)
- Expired
- Jul 6, 1987, 7:00 PM CDT
- In force
- 25 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Lyman 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, 6:40 PM CDT | Tornado F1 | Lyman, SD | |
| Jul 6, 6:52 PM CDT | Tornado F0 | Lyman, 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 12:00Z, 11.6 hours before the alert went out and 160 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
- 190 J/kg
- Mixed-layer CIN
- -276 J/kg
- Mixed-layer LCL
- 1517 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KHON 062335 TORHON SDC085-070000- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE HURON SD 635 PM CDT MON JUL 6 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL SOUTH DAKOTA...EASTERN LYMAN SOME OF THE CITIES INCLUDED IN THIS WARNING ARE RELIANCE AND OACOMA. AT 634 PM CDT A TORNADO WAS REPORTED A TORNADO WAS REPORTED NEAR RELIANCE. MOVING EAST AT 15 MILES AN HOUR. IF YOU ARE IN THE PATH OF THIS TORNADO...YOU SHOULD GO TO A BASEMENT SHELTER IF AVAILABLE. OTHERWISE GO TO A CENTRAL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. CARS AND MOBILE HOMES SHO ULD BE ABANDONED FOR A REINFORCED BUILDING.
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 4:53 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde | 67 min |
| Jul 6, 5:22 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde | 68 min |
| Jul 6, 5:26 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, Walworth | 64 min |
| Jul 6, 5:26 PM CDT | Severe Thunderstorm Warning | ABR | Potter | 64 min |
| Jul 6, 5:45 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds, Faulk | 60 min |
| Jul 6, 5:45 PM CDT | Severe Thunderstorm Warning | ABR | McPherson | 60 min |
| Jul 6, 5:47 PM CDT | Severe Thunderstorm Warning | ABR | Hand, Hyde | 58 min |
| Jul 6, 5:54 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo | 66 min |
| Jul 6, 6:18 PM CDT | Tornado Warning | ABR | Hand | 27 min |
| Jul 6, 6:25 PM CDT | Tornado Warning | ABR | Buffalo | 35 min |
| Jul 6, 6:30 PM CDT | Tornado Warning | ABR | Faulk | 30 min |
| Jul 6, 6:40 PM CDT | Tornado Warning | ABR | Hughes, Hyde | 10 min |
| Jul 6, 6:45 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds, McPherson | 60 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.