Alert archive / South Dakota / Tornado Warnings in 1987
Tornado Warning 21, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Aug 5, 1987, 4:41 PM CDT for Sully County, South Dakota. It was in force for 34 min. 1 report 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, 4:41 PM CDT (21:41 UTC)
- Expired
- Aug 5, 1987, 5:15 PM CDT
- In force
- 34 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Sully 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, 5:00 PM CDT | Thunderstorm Wind 61 | Sully, 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, 9.7 hours before the alert went out and 138 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1519 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 168 m²/s²
- 0-3 km storm-relative helicity
- 328 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KHON 052141 TORHON SDC119-052215- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE HURON SD 441 PM CDT WED AUG 5 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 515 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL SOUTH DAKOTA...SULLY SOME OF THE CITIES INCLUDED IN THIS WARNING ARE OKOBOJO AND ONIDA. AT 435 PM CDT RADAR INDICATED A POSSIBLE TORNADO NEAR OKOBOJO OR 25 MILES NORTH OF PIERRE MOVING EAST AT 25 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 SHOULD BE ABANDONED FOR A REINFORCED BUILDING. SPRINGER
The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 4:28 PM CDT | Severe Thunderstorm Warning | ABR | Sully | 62 min |
| Aug 5, 4:32 PM CDT | Severe Thunderstorm Warning | ABR | Potter | 58 min |
| Aug 5, 5:13 PM CDT | Severe Thunderstorm Warning | ABR | Potter, Walworth | 62 min |
| Aug 5, 5:29 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde, Stanley, Sully | 61 min |
| Aug 5, 5:29 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds | 61 min |
| Aug 5, 5:49 PM CDT | Severe Thunderstorm Warning | ABR | Hand | 56 min |
| Aug 5, 6:13 PM CDT | Severe Thunderstorm Warning | ABR | Edmunds, McPherson | 62 min |
| Aug 5, 6:16 PM CDT | Severe Thunderstorm Warning | ABR | Faulk | 59 min |
| Aug 5, 6:34 PM CDT | Severe Thunderstorm Warning | ABR | Brown | 56 min |
| Aug 5, 6:46 PM CDT | Severe Thunderstorm Warning | ABR | Buffalo, Hughes, Hyde, Lyman | 59 min |
| Aug 5, 6:46 PM CDT | Severe Thunderstorm Warning | ABR | Hand | 59 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.