Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 154, NWS Sioux Falls, SD

August 3, 1986Tripp County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 3, 1986, 8:29 PM CDT for Tripp County, South Dakota. It was in force for 36 min.

The area

The counties it named.

The facts

Issued
Aug 3, 1986, 8:29 PM CDT (01:29 UTC)
Expired
Aug 3, 1986, 9:05 PM CDT
In force
36 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Tripp 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, 1.5 hours before the alert went out and 209 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, Aberdeen, SD at 00:00Z on 1986-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Aberdeen, SD at 00:00Z on 1986-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 040129
SVRFSD
SDC123-040230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
829 PM CDT SUN AUG 3 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 930 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

SOUTH CENTRAL SOUTH DAKOTA...SOUTHERN TRIPP

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE CLEARFIELD..
KEYAPAHA..MILLBORO..AND WEWELA.

AT 825 PM CDT  RADAR INDICATED A SEVERE THUNDERSTORM 17 MILES
SOUTHWEST OF WINNER SOUTH DAKOTA. THIS SEVERE THUNDERSTORM WAS
MOVING SOUTH/SOUTHEAST AT 15 MPH.

 3/4 INCH HAIL COVERING THE GROUND HAS BEEN REPORTED WITH THIS
SEVERE THUNDERSTORM ALONG WITH HEAVY RAINS OF OVER AN INCH.

IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED
SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS OF
60 MPH..HAIL 3/4 INCH OR LARGER..DEADLY LIGHTNING..AND HEAVY RAIN
THAT CAN QUICKLY FLOOD A LOW LYING AREA.

KAPELA

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Aug 3, 7:45 PM CDT, 44 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
745 PM CDT SUN AUG 3 1986

TIME                   EVENT AND LOCATION

725 PM CDT             3/4 INCH HAIL /AND SMALLER/ COVERED GROUND
                       TOTALLY WHITE IN WITTEN AREA OF TRIPP COUNTY
                       ..ABOUT 12 MILES WEST/NORTHWEST OF WINNER SD...
                       1.50 INCHES OF RAIN AT WITTEN FROM 700 TO 730 PM
KAPELA
Special weather statement, Aug 3, 7:47 PM CDT, 42 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
745 PM CDT SUN AUG 3 1986

AT 730 PM CDT...ISOLATED INTENSE THUNDERSTORMS WITH VERY
HEAVY RAINS HAD DEVELOPED OVER SOUTH CENTRAL SOUTH DAKOTA.

THE INTENSE THUNDERSTORMS WERE LOCATED JUST WEST OF WINNER.
THESE THUNDERSTORMS MAY PRODUCE LARGE HAIL..GUSTY WINDS..
FREQUENT LIGHTNING..AND VERY HEAVY RAIN.

OTHERWISE..ISOLATED THUNDERSTORMS WERE OCCURING 70 MILES SOUTHWEST
OF PIERRE.

MOVEMENT WAS SOUTHEAST AT 20 MILES AN HOUR.

EDDY/MILLER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:22 PM CDTSevere Thunderstorm WarningFSDTripp68 min
Aug 4, 5:02 AM CDTSevere Thunderstorm WarningFSDBon Homme58 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1986Every severe thunderstorm warning 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.