Alert archive / South Dakota / Tornado Warnings in 1986

Tornado Warning 13, NWS Aberdeen, SD

July 18, 1986Brown County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 18, 1986, 8:12 PM CDT for Brown County, South Dakota. It was in force for 33 min.

The area

The counties it named.

The facts

Issued
Jul 18, 1986, 8:12 PM CDT (01:12 UTC)
Expired
Jul 18, 1986, 8:45 PM CDT
In force
33 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Brown 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.2 hours before the alert went out and 223 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-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 1986-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 747 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 1986-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -128 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
747 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
714 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
-128 m²/s²
0-3 km storm-relative helicity
-74 m²/s²
Significant tornado parameter
-0.3
Supercell composite
-2.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 190112
TORABR
SDC013-190145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
812 PM CDT FRI JUL 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHEAST SOUTH DAKOTA...SOUTHEAST BROWN

SOME OF THE CITIES INCLUDED IN THIS TORNADO WARNING ANE GROTON
PUTNEY FERNEY

AT 806 PM CDT  A FUNNEL CLOUD WAS REPORTED BY THE GROTON POLICE 4
 MILES NORTH OF GROTON. NO MOVEMENT REPORTED.

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. CAR"S AND MOBILE HOMES SHOULD BE ABANDONED FOR
A REINFORCED BUILDING.

HUSTON

The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 18, 7:02 PM CDTSevere Thunderstorm WarningABRCorson58 min
Jul 18, 7:34 PM CDTSevere Thunderstorm WarningABRDewey56 min
Jul 18, 8:00 PM CDTSevere Thunderstorm WarningABRCampbell, Walworth60 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; the sounding from the Mesonet's radiosonde archive.