Alert archive / South Dakota / Tornado Warnings in 1986
Tornado Warning 21, NWS Aberdeen, SD
NWS Aberdeen, SD issued this tornado warning at Jul 29, 1986, 10:52 PM CDT for Codington County, South Dakota. It was in force for 38 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 29, 1986, 10:52 PM CDT (03:52 UTC)
- Expired
- Jul 29, 1986, 11:30 PM CDT
- In force
- 38 min
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Codington 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 29, 11:04 PM CDT | Tornado F1 | Codington, SD | |
| Jul 29, 11:40 PM CDT | Hail 2 | Codington, 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, 3.9 hours before the alert went out and 96 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
- 3602 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1336 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 24.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KHON 300352 TORHON SDC029-300430- BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE HURON SD 1052 PM CDT TUE JUL 29 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF EAST CENTRAL SOUTH DAKOTA...NORTHERN CODINGTON SOME OF THE CITIES INCLUDED IN THE WARNING AREA ARE WATERTOWN.. FLORENCE..AND THE LAKE KAMPESKA AREA. AT 1050 PM CDT RADAR INDICATED A POSSIBLE TORNADO 5 MILES WEST OF FLORENCE IN EXTREME NORTHWESTERN CODINGTON COUNTY. IT WAS MOVING EAST SOUTHEAST AT 40 MILES AN HOUR. THIS IS A VERY DANGEROUS STORM. IF YOU ARE IN THE PATH OF THIS TORNADO...SYOU 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 |
|---|---|---|---|---|
| Jul 29, 8:00 PM CDT | Severe Thunderstorm Warning | ABR | Clark, Hamlin, Kingsbury | 60 min |
| Jul 29, 8:26 PM CDT | Severe Thunderstorm Warning | ABR | Day | 64 min |
| Jul 29, 8:56 PM CDT | Severe Thunderstorm Warning | ABR | Hamlin, Kingsbury | 64 min |
| Jul 29, 8:56 PM CDT | Severe Thunderstorm Warning | ABR | Deuel | 64 min |
| Jul 29, 10:00 PM CDT | Severe Thunderstorm Warning | ABR | Deuel | 30 min |
| Jul 29, 10:03 PM CDT | Severe Thunderstorm Warning | ABR | Day | 57 min |
| Jul 29, 10:08 PM CDT | Severe Thunderstorm Warning | ABR | Corson | 67 min |
| Jul 29, 10:17 PM CDT | Severe Thunderstorm Warning | ABR | Campbell | 58 min |
| Jul 29, 10:19 PM CDT | Severe Thunderstorm Warning | ABR | Codington, Grant | 56 min |
| Jul 29, 10:30 PM CDT | Tornado Warning | ABR | Clark | 30 min |
| Jul 29, 10:50 PM CDT | Severe Thunderstorm Warning | ABR | Walworth | 55 min |
| Jul 29, 11:00 PM CDT | Severe Thunderstorm Warning | ABR | Day | 60 min |
| Jul 29, 11:11 PM CDT | Severe Thunderstorm Warning | ABR | Campbell | 64 min |
| Jul 29, 11:21 PM CDT | Tornado Warning | ABR | Codington | 39 min |
| Jul 29, 11:36 PM CDT | Severe Thunderstorm Warning | ABR | Campbell, McPherson | 69 min |
| Jul 29, 11:58 PM CDT | Tornado Warning | ABR | Codington, Deuel, Hamlin | 32 min |
| Jul 30, 12:28 AM CDT | Tornado Warning | ABR | Deuel, Grant | 32 min |
| Jul 30, 2:46 AM CDT | Severe Thunderstorm Warning | ABR | Faulk, Spink | 59 min |
Nearby
Tornado Warnings in South Dakota, 1986Every tornado warning in 1986Tornadoes in 1986
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.