Alert archive / South Dakota / Tornado Warnings in 1986

Tornado Warning 20, NWS Aberdeen, SD

July 29, 1986Clark County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 29, 1986, 10:30 PM CDT for Clark County, South Dakota. It was in force for 30 min.

The area

The counties it named.

The facts

Issued: Jul 29, 1986, 10:30 PM CDT (03:30 UTC)
Expired: Jul 29, 1986, 11:00 PM CDT
In force: 30 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Clark 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, 3.5 hours before the alert went out and 53 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KHON 300330 RRA
TORHON
SDC025-300400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE HURON SD
1030 PM CDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 1100 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

EAST CENTRAL SOUTH DAKOTA...EXTREME NORTHEAST CLARK

SOME OF THE CITIES INCLUDED IN BRADLEY

AT 1025 PM CDT RADAR INDICATED A POSSIBLE TORNADO 5 MILES NORTHWEST
 OF BRADLEY..OR 30 MILES NORTHWEST OF WATERTOWN MOVING SOUTHEAST
 AT 30 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 FLOOGR POSSIBLE. CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR
A REINFORCED BUILDING.

SPRINGER/MILLER

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, 10:50 PM CDT	Severe Thunderstorm Warning	ABR	Walworth	55 min
Jul 29, 10:52 PM CDT	Tornado Warning	ABR	Codington	38 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, 1986 Every tornado warning in 1986 Tornadoes 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; the sounding from the Mesonet's radiosonde archive.