Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 142, NWS Sioux Falls, SD

July 29, 1986Douglas County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 29, 1986, 5:55 PM CDT for Douglas County, South Dakota. It was in force for 65 min.

The area

The counties it named.

The facts

Issued: Jul 29, 1986, 5:55 PM CDT (22:55 UTC)
Expired: Jul 29, 1986, 7:00 PM CDT
In force: 65 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Douglas 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 12:00Z, 10.9 hours before the alert went out and 168 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: 56 J/kg
Mixed-layer CIN: -494 J/kg
Mixed-layer LCL: 1874 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: -38 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 292255
SVRFSD
SDC009-023-043-135-067-300000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
555 PM CDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST SOUTH DAKOTA...BON-HOMME...EASTERN CHARLES-MIX...SOUTHEAST 
 DOUGLAS...WESTERN YANKTON AND HUTCHINSON

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN SOUTHEAST SOUTH DAKOTA ARE PARKSTON.
.TRIPP..FREEMAN..TABOR..TYNDALL..AVON..SPRINGFIELD..WAGNER..
DELMONT.

AT 550 PM CDT  RADAR INDICATED A LINE OF THUNDERSTORMS FROM 15
MILES SOUTH OF MITCHELL SOUTH DAKOTA TO 35 MILES WESTNORTHWEST
OF YANKTON SOUTH DAKOTA. THESE THUNDERSTORMS WERE MOVING TO
EAST AT 30 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.

BEHREND

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, Jul 29, 12:40 PM CDT, 5 hours 15 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1240 PM CDT TUE JUL 29 1986

AT 1230 PM CDT...SCATTERED SHOWERS AND THUNDERSTORMS
..AND AN ISOLATED INTENSE STORM WITH VERY HEAVY RAIN..
WERE OVER PARTS OF EASTERN SOUTH DAKOTA.

THE STRONGEST STORM WAS 15 MILES NORTHWEST OF MADISON..
OR 50 MILES NORTHWEST OF SIOUX FALLS.

THIS STORM WAS WITHIN A 40 MILE WIDE AREA THAT EXTENDED
FROM 35 MILES NORTHWEST OF HURON...TO NEAR MADISON.

SOME OF THESE STORMS MAY PRODUCE SMALL HAIL..
GUSTY WINDS..LIGHTNING STRIKES..AND VERY HEAVY RAINS.
PEA SIZE HAIL HAS BEEN REPORTED WITH SOME OF THESE STORMS.

OTHER SHOWERS WERE ALONG THE JAMES RIVER..FROM HURON TO ABERDEEN.
ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR.

KRAUSE/MILLER

Special weather statement, Jul 29, 4:45 PM CDT, 1 hour 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
440 PM CDT TUE JUL 29 1986

...ISOLATED INTENSE THUNDERSTORM IN SOUTH CENTRAL SOUTH DAKOTA...

AN ISOLATED INTENSE THUNDERSTORM HAS DEVELOPED IN SOUTH CENTRAL
SOUTH DAKOTA ABOUT 55 MILES SOUTHWEST OF MITCHELL IN THE BONESTEEL AREA.
THIS THUNDERSTORM WAS MOVING TO THE EAST AT 25 MPH.

VERY HEAVY RAIN..SMALL HAIL AND STRONG GUSTYY WINDS ARE POSSIBLE WITH
THIS THUNDERSTORMS. PEOPLE IN THE SOUTH CENTRAL SOUTH DAKOTA COUNTIES
OF SOUTHEAST GREGORY..SOUTHERN CHARLES-MIX AND BON HOMME SHOULD BE
ALERT UNTIL 6 PM CDT..ESPECIALLY IN THE CITIES OF BONESTEEL..PICKSTOWN
..AVON..SPRINGFIELD AND TYNDALL. CAMPERS AND BOATERS ALONG MISSOU:RI
RIVER FROM JUST NORTH OF PICKSTOWN TO WEST OF YANKTON SHOULD ALSO BE
ALERT FOR THIS INTENSE THUNDERSTORM.
BEHREND

Local storm report, Jul 29, 5:39 PM CDT, 16 minutes before

-DSMLSRSUX

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX CITY IA
538 PM CDT TUE JUL 29 1986

          ...ALL TIMES CDT ON 28 JULY 1986...

          ...WOODBURY COUNTY IOWA...
750 PM    EXTENSIVE HAIL DAMAGE TO CARS AND WINN-A-BINGO HALL 4 MILES
          WEST OF SLOAN IOWA.
750 PM    TORNADO PASSED THROUGH SNYDER-S BEND STATE PART...ABOUT 15
          MILES SOUTH OF SIOUX CITY.  EXTENSIVE DAMAGE TO TREES.
800 PM    MOBILE HOME DESTROYED ONE MILE NORTH OF SLOAN.
          ...O-BRIEN COUNTY IOWA...
745 PM    MARBLE SIZE HAIL 6 MILES WEST OF PRIMGHAR.
800 PM    LARGE TREE...31/2 FT IN DIAMETER...DOWN 3 MILES EAST OF
          PRIMGHAR.
830 PM    FRONT WINDOW OF TV REPAIR SHOP IN SUTHERLAND BLOWN OUT.
830 PM    ALL THE FOLLOWING DAMAGE WAS REPORTED IN HARTLEY...68 MILES
          NORTHEAST OF SIOUX CITY.
          1. 24 BY 24 FT. METAL BLDG. DESTROYED. CONTENTS NOT TOUCHED.
          2. SUPERAMERICA MINI MART ROOF BLOWN OFF.
          3. MANY LARGE TREES DOWN. ONE MEASURED 21/2 FT DIAMETER.
835 PM    THREE SILOS DESTROYED ON FARM 4 MILES SOUTH OF HARTLEY.
835 PM    MACHINE SHED DESTROYED ON FARM 31/2 MILES EAST OF HARTLEY.
800 PM    WIND ESTIMATED 50 TO 55 MPH IN SANBORN.  MANY TREES 2 TO
          3 FT. DIAMETER BLOWN DOWN.  SOME TREES SPLIT IN TWO.
          ONE TREE FELL ON TOWN MEDICAL CENTER.
845 PM    ONE MILE SECTION OF CORNBELT POWER LINE...EAST OF HARTLEY
          ON THE O-BRIEN - CLAY COUNTY BORDER...BLOWN DOWN.
          TIME APPROXIMATED.
          ...CHEROKEE COUNTY IOWA...
823 PM    WIND GUST TO 81 MPH RECORDED AT CHEROKEE AIRPORT.
825 PM    WIND ESTIMATED AT 60 TO 65 MPH 5 MILES NORTH OF CHEROKEE.
          ...UNION COUNTY SOUTH DAKOTA...
830 PM    BASEBALL SIZE HAIL REPORTED AT JEFFERSON.  MANY WINDOWS
          BROKEN OUT.  HEN EGG SIZE HAIL AT ELK POINT.

REPORTS AND OBSERVATIONS INDICATED THE TORNADO PATH WAS ABOUT 45 MILES
IN LENGTH.  TOUCHDOWN WAS NEAR NEWCASTLE...IN NORTHERN DIXON COUNTY
WITH LAST OBSERVED LOCATION ABOUT 3 MILES SOUTHEAST OF SLOAN...JUST
INSIDE MONONA COUNTY IOWA. TORNADO OBSERVED FROM 6:30 PM TO 810 PM CDT.
SHERLIN

Special weather statement, Jul 29, 5:40 PM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
535 PM CDT TUE JUL 29 1986

AT 530 PM CDT...NUMEROUS THUNDERSTORMS...SOME OF WHICH WERE
INTENSE...CONTINUED DEVELOPING OVER SOUTHEAST SOUTH DAKOTA
AND NORTHEAST NEBRASKA.

THE STRONGEST STORMS WERE OVER SOUTHEAST SOUTH DAKOTA...50
MILES WEST OF YANKTON AND 30 MILES SOUTHWEST OF MITCHELL.
VERY HEAVY RAIN...STRONG WIND...AND HAIL ARE LIKELY WITH
THESE STORMS.

xIN NEBRSAKA...THE THUNDERSTORMS WERE NORTH OF A LINE FROM
ONEILL TO SIOUX CITY.

ALL OF THE STORMS WERE MOVING EAST AT 35 MILES AN HOUR.

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:25 PM CDT	Tornado Warning	FSD	Yankton	35 min
Jul 28, 7:45 PM CDT	Severe Thunderstorm Warning	FSD	Clay	60 min
Jul 29, 5:55 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Hutchinson, Yankton	65 min
Jul 29, 6:07 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook	68 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1986 Every 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.