Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 178, NWS Sioux Falls, SD

August 16, 1986Union County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 1986, 11:06 PM CDT for Union County, South Dakota. It was in force for 54 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 16, 1986, 11:06 PM CDT (04:06 UTC)
Expired
Aug 17, 1986, 12:00 AM CDT
In force
54 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Union County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Aug 16, 11:27 PM CDTThunderstorm Wind 0Union, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.1 hours before the alert went out and 170 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, Omaha, NE at 00:00Z on 1986-08-17Temperature 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, Omaha, NE at 00:00Z on 1986-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
3605 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
48 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 KSUX 170406
SVRSUX
SDC127-170500-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX-CITY IA
1106 PM CDT SAT AUG 16 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL MIDNIGHT CDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
 
IN SOUTHEAST SOUTH DAKOTA
          ..UNION

 
 
AT 1125 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST TO THE EAST
OF VERMILLION...33 MILES NORTHWEST OF SIOUX CITY...IN SOUTHEAST SOUTH
DAKOTA.  AT 1127 PM WIND GUSTS OVER 70 MILES AN HOUR WERE REPORTED IN
VERMILLION.
 
THIS THUNDERSTORM WAS MOVING SOUTHEAST AT 15 MILES AN HOUR.
 
PERSONS IN UNION COUNTY SOUTH DAKOTA SHOULD BE ON THE LOOKOUT FOR THE
APPROACH OF ANY SEVERE WEATHER AND TAKE SHELTER IMMEDIATELY IF
OBSERVED.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH,
DESTRUCTIVE HAIL, DEADLY LIGHTNING AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.
SHERLIN

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, Aug 16, 9:49 PM CDT, 1 hour 17 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
948 PM CDT SAT AUG 16 1986

A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR EAST CENTRAL AND
SOUTHEAST SOUTH DAKOTA UNTIL 11PM CDT TONIGHT...

AT 945 PM... THERE WERE NUMEROUS INTENSE THUNDERSTORMS WITH VERY
HEAVY RAIN IN EAST CENTRAL AND SOUTHEAST SOUTH DAKOTA.

THE STRONGEST THUNDERSTORMS WERE 30 MILES NORTHWEST OF MITCHELL NEAR
PLANKINTON AND 35 MILES NORTHWEST OF SIOUX FALLS NEAR WINFRED.

HAIL AND STRONG GUSTY WINDS WERE IN THESE STORMS.

MOVEMENT WAS EAST AT 12 MILES AN HOUR.

BE ALERT FOR SEVERE THUNDERSTORMS AND TAKE IMMEDIATE COVER.
PRESTON
Local storm report, Aug 16, 10:16 PM CDT, 50 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1010 PM CDT SAT AUG 16 1986

TIME             EVENT AND LOCATION

945-950 PM CDT   55 MPH WIND GUST AT CANISTOTA SD IN MCKOOK COUNTY
                 70 MPH WIND GUST AT SALEM SD IN MCKOOK COUNTY
                 MARBLE SIZE HAIL 6 MILES OF SALEM IN MCKOOK COUNTY
                 60 MPH WIND GUST AT MT VERNON SD IN DAVISON COUNTY

BUSS
Local storm report, Aug 16, 10:24 PM CDT, 42 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1025 PM CDT SAT AUG 16 1986

TIME             EVENT AND LOCATION

1015 PM CDT      40 MPH WIND GUST AT HUMBODLT SD IN MINNEHAHA COUNTY
                 LOST ELECTRICITY DUE TO FREQUENT LIGHTNING STRIKES
                 AT HUMBODLT SD IN MINNEHAHA COUNTY

BUSS
Local storm report, Aug 16, 10:29 PM CDT, 37 minutes before
KFSD 170329

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1030 PM CDT SAT AUG 16 1986

TIME             EVENT AND LOCATION

1008 PM CDT      FUNNEL CLOUD REPORTED BY CIVIL DEFENSE PERSONS JUST
                 NORTH  AND SOUTH OF PARKER SD IN TURNER COUNTY NO
                 TOUCHDOWN.

BUSS
Local storm report, Aug 16, 10:34 PM CDT, 32 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1030 PM CDT SAT AUG 16 1986

TIME             EVENT AND LOCATION

1008 PM CDT      FUNNEL CLOUDY REPORTED BY CIVIL DEFENSE PERSONS JUST
!                 NORTH AND SOUTH OF PARKER SD IN TURNER COUNTY..NO
                 TOUCHDOWN.

BUSS
Special weather statement, Aug 16, 10:44 PM CDT, 22 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1040 PM CDT SAT AUG 16 1986

...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA..NORTHWEST
   IOWA..AND NORTHEAST NEBRASKA UNTIL 400 AM CDT FRIDAY MORNING...

AT 1040 PM...THERE WERE NUMEROUS INTENSE THUNDERSTORMS WITH VERY
HEAVY RAIN IN SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA.

THE STRONGEST THUNDERSTORMS WERE IN A 25 MILE WIDE BAND FROM SIOUX
FALLS TO 30 MILES SOUTHWEST OF MITCHELL.

HAIL AND STRONG GUSTY WINDS HAD BEEN REPORTED WITH THESE STORMS.

MOVEMENT WAS EAST AT 12 MILES AN HOUR.

BE ALERT FOR SEVERE THUNDERSTORMS AND BE PREPARED TO TAKE COVER
IF THREATENING WEATHER APPROACHES..
STOREY

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 9:10 PM CDTTornado WarningFSDAurora, Brule35 min
Aug 16, 9:16 PM CDTSevere Thunderstorm WarningFSDHanson, McCook59 min
Aug 16, 9:16 PM CDTSevere Thunderstorm WarningFSDAurora, Brule59 min
Aug 16, 9:16 PM CDTSevere Thunderstorm WarningFSDDavison59 min
Aug 16, 10:05 PM CDTSevere Thunderstorm WarningFSDLake, Minnehaha55 min
Aug 16, 10:05 PM CDTSevere Thunderstorm WarningFSDLincoln, Turner55 min
Aug 16, 10:17 PM CDTSevere Thunderstorm WarningFSDDavison, Douglas, Hutchinson58 min
Aug 16, 10:17 PM CDTSevere Thunderstorm WarningFSDHanson58 min
Aug 16, 10:37 PM CDTSevere Thunderstorm WarningFSDClay, Lincoln, Turner68 min
Aug 16, 10:37 PM CDTSevere Thunderstorm WarningFSDYankton68 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.