Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 60, NWS Sioux Falls, SD

June 21, 1986Tripp County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 21, 1986, 9:58 PM CDT for Tripp County, South Dakota. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1986, 9:58 PM CDT (02:58 UTC)
Expired
Jun 21, 1986, 11:00 PM CDT
In force
62 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, 3.0 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 1986-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3109 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, Aberdeen, SD at 00:00Z on 1986-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 136 square meters per square second.1939587897Sfc1 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
3109 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
1356 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
136 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
1.0
Supercell composite
4.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 220258
SVRFSD
SDC123-220400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
958 PM CDT SAT JUN 21 1986

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

SOUTH CENTRAL SOUTH DAKOTA...SOUTHEAST TRIPP

SOME OF THE CITIES INCLUDED IN SOUTH CENTRAL DAKOTA ARE WEWELA
AND COLOME.

AT 950 PM CDT  RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES
SOUTH OF WINNER. THE THUNDERSTORM WAS MOVING EAST AT 15 MPH.

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.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

WEILAND

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

Special weather statement, Jun 21, 7:20 PM CDT, 2 hours 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
715 PM CDT SAT JUN 21 1986

...SEVERE THUNDERSTORM WATCH 284 CONTINUES UNTIL 1000 PM FOR MUCH OF
EASTERN SOUTH DAKOTA...

AT 715 PM CDT AN INTENSE THUNDERSTORM WAS LOCATED 35 MILES NORTHEAST
OF SIOUX FALLS JUST EAST OF HOWARD. THIS INTENSE THUNDERSTORM WAS
MOVING EAST AT 20 MPH AND WAS LIKELY PRODUCING VERY HEAVY RAINS..
GUSTY WINDS TO PERHAPS 45 MPH..AND SMALL HAIL. THIS STORM WILL HIT THE
MADISON CITY AREA BY 800 PM CDT...BUT WILL ALSO AFFECT OTHER CITIES IN
LAKE COUNTY.
KAPELA
Local storm report, Jun 21, 8:16 PM CDT, 1 hour 42 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
815 PM CDT SAT JUN 21 1986

535 PM CDT        FUNNEL CLOUD REPORTED NEAR CANOVA

540 PM CDT        ONE INCH DIAMETER HAIL AT HOWARD

725 PM CDT     *   FUNNEL CLOUD REPORTED AT CANOVA

802 PM CDT        ONE HALF INCH DIAMETER HAIL AT JUNIUS AND 6 TO 8
                  MILES SOUTHWEST OF MADISON

WEILAND
Special weather statement, Jun 21, 9:03 PM CDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
900 PM CDT SAT JUN 21 1986

..TORNADO WATCH NUMBER 284 CANCELLED FOR MUCH OF EASTERN SOUTH
DAKOTA...

THE TORNADO WATCHV THAT WAS IN EFFECT FOR MUCH OF EASTERN SOUTH DAKOTA
UNTIL 1000 PM CDT HAS BEEN CANCELLED. A SEVERE THUNDERSTORM WATCH HAS
BEEN ISSUED IN ITS PLACE FOR SOUTHEAST SOUTH DAKOTA..SOUTHWEST
MINNESOTA AND NORTHWEST IOWA.
WEILAND
Local storm report, Jun 21, 9:51 PM CDT, 7 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
950 PM CDT SAT JUN 21 1986

STORM REPORTS RELAYED VIA KELO-TV IN SIOUX FALLS SOUTH DAKOTA

915 PM CDT        BASEBALL SIZED HAIL AT COLMAN SOUTH DAKOTA IN
                  WESTERN MOODY COUNTY..OR ABOUT 25 MILES NORTH OF
                  SIOUX FALLS.

                  3 1/3 INCHES OF RAIN REPORTED SINCE THIS AFTERNOON AT
                  MADISON SOUTH DAKOTA IN LAKE COUNTY..OR 30 MILES NORTH
                  NORTHWEST OF SIOUX FALLS.
THEOPHILUS
Special weather statement, Jun 21, 9:54 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
950 PM CDT SAT JUN 21 1986

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF
EASTERN SOUTH DAKOTA UNTIL 300 AM CDT SUN JUNE 22...

AT 935 PM CDT...A LINE OF SEVERE THUNDERSTORMS WAS LOCATED
OVER SOUTHERN LAKE AND EASTERN MCCOOK COUNTIES.

HAIL..STRONG WINDS..AND HEAVY RAIN ARE POSSIBLE WITH THESE
THUNDERSTORMS.  LOCALLY HEAVY RAINS MAY CAUSE SMALL STREAM
AND LOWLAND FLOODING.

THESE THUNDERSTORMS WERE MOVING EAST AT 15 MILES AN HOUR.

OTHERWISE..THUNDERSTORMS WITH HEAVY RAIN WERE OVER CENTRAL
SOUTH DAKOTA IN A 50 MILE WIDE AREA FROM 60 MILES NORTHWEST
OF PIERRE TO THE NEBRASKA BORDER 30 MILES SOUTHWEST OF WINNER.
THESE THUNDERSTORMS EXTENDED INTO NORTHERN NEBEASKA..AND

THE STRONGEST STORMS IN THIS AREA WERE ABOUT TO MOVE INTO
GREGORY AND TRIPP COUNTIES.

MOVEMENT OF THESE STORMS WAS EASTNORTHEAST AT 15 MILES AN HOUR.

KRAUSE/MORRIS

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 7:26 PM CDTSevere Thunderstorm WarningFSDLake64 min
Jun 21, 8:32 PM CDTSevere Thunderstorm WarningFSDLake, Moody58 min
Jun 21, 9:15 PM CDTSevere Thunderstorm WarningFSDMinnehaha, Moody60 min
Jun 21, 9:33 PM CDTSevere Thunderstorm WarningFSDLake, McCook57 min
Jun 21, 10:44 PM CDTSevere Thunderstorm WarningFSDMinnehaha61 min
Jun 22, 12:06 AM CDTSevere Thunderstorm WarningFSDClay, Lincoln, Turner, Yankton69 min
Jun 22, 12:06 AM CDTSevere Thunderstorm WarningFSDHutchinson, McCook, Minnehaha69 min
Jun 22, 12:07 AM CDTSevere Thunderstorm WarningFSDUnion68 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.