Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 13, NWS Sioux Falls, SD

May 7, 1986Yankton County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 7, 1986, 9:53 PM CDT for Yankton County, South Dakota. It was in force for 67 min. 2 reports 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
May 7, 1986, 9:53 PM CDT (02:53 UTC)
Expired
May 7, 1986, 11:00 PM CDT
In force
67 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Yankton 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
May 7, 10:10 PM CDTThunderstorm Wind 0Yankton, SD
May 7, 10:35 PM CDTThunderstorm Wind 0Yankton, 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, 2.9 hours before the alert went out and 206 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 1986-05-08Temperature 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 1986-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 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
3569 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
156 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 080253
SVRFSD
SDC023-053-135-080400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
953 PM CDT WED MAY 7 1986

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

SOUTH CENTRAL SOUTH DAKOTA...SOUTHEAST CHARLES-MIX...EXTREME 
 SOUTHEAST GREGORY AND YANKTON

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN SOUTHEAST SOUTH DAKOTA ARE
BONESTEEL...PICKSTOWN...WAGNER...YANKTON...

AT 950 PM CDT  RADAR INDICATED A NUMBER OF SEVERE THUNDERSTORMS...
ONE 10 MILES SOUTH OF BONESTEEL...AND ANOTHER IN THE SOUTHEAST
CORNER OF YANKTON COUNTY. THESE STORMS WERE MOVING NORTH NORTHEAST
AT 25 MILES PER HOUR.

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.

WILLIAMS

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, May 7, 4:41 PM CDT, 5 hours 12 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
440 PM CDT WED MAY 7 1986

...WEATHER ADVISORY FOR LIVESTOCK TONIGHT AND THURSDAY EXTREME
NORTHWEST AND WEST/CENTRAL SOUTH DAKOTA...

A VERY SLOW MOVING LOW PRESSURE SYSTEM OVER THE ROCKIES INTO THE
WESTERN HIGH PLAINS WILL CAUSE WET WEATHER OVER MUCH OF SOUTH
DAKOTA INTO THE WEEKEND. TEMPERATURES WILL BE COOL ENOUGH IN
EXTREME NORTHWEST AND WEST/CENTRAL SOUTH DAKOTA FOR OCCASIONAL COLD
RAIN TO BE MIXED WITH WET SNOW AT TIMES. DAMP EAST TO NORTHEAST WINDS
OF 10 TO 25 MPH WILL ALSO PUT A STRESS ON LIVESTOCK IN THESE AREAS.

WARMER MOIST AIR WILL SURGE INTO MUCH OF THE REMAINDER OF SOUTH DAKOTA
THROUGH FRIDAY. DEVELOPING SCATTERED SHOWERS AND THUNDERSTORMS COULD
BE HEAVY AT TIMES THROUGH FRIDAY. THIS WILL NOT BE GOOD NEWS FOR
PEOPLE WHO ALREADY HAVE ENOUGH WATER TO LAST THEM FOR AWHILE. IT IS
STILL TOO SOON TO SAY EXACTLY WHERE IN THE STATE WILL GET THE HEAVIEST
PRECIPITATION..SO PLEASE KEEP UP TO DATE ON THE LATEST FORECASTS.
RYRHOLM
Special weather statement, May 7, 7:49 PM CDT, 2 hours 4 minutes before
KHON 080047

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
745 PM CDT WED MAY 7 1986

AT 745 PM CDT...THERE WERE SCATTERED INTENSE THUNDERSTORMS WITH
HEAVY RAIN IN CENTRAL AND SOUTHWEST SOUTH DAKOTA. THE THUNDESTORMS
WERE FROM 40 MILES NORTHWEST OF HURON TO 70 MILES SOUTHEAST OF RAPID
CITY NEAR MARTIN.

SMALL HAIL IS POSSIBLE IN THE THUNDERSTORMS WITH WIND GUST TO
45 MILES AN HOUR.

THUNDERSTORMS WERAE MOVING NORTH AT 45 MILES AN HOUR.

PRESTON
Special weather statement, May 7, 8:00 PM CDT, 1 hour 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
800 PM CDT WED MAY 7 1986

AT 750 PM CDT INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND POSSIBLE
HAIL WERE LOCATED OVER PORTIONS OF NORTHEAST NEBRASKA AND WILL BE
MOVING INTO SOUTH DAKOTA FROM ABOUT PICKSTOWN TO YANKTON WITHIN THE
NEXT HOUR. IT MAY BE NECCASSARY TO ISSUE WARNINGS ON THERE STORMS
LATER THIS EVENING.

AN AREA OF VERY HEAVY RAIN WAS ALSO LOCATED OVER CENTRAL SOUTH DAKORTA
FROM PIERRE SOUTHWEST TO MISSION. ALL STORMS WERE MOVING TO THE NORTH
NORTHEAST AT ABOUT 25 MPH.
KOSCIELSKI

The office that day

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

IssuedProductOfficeCountiesLasted
May 7, 8:27 PM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix53 min
May 7, 9:23 PM CDTSevere Thunderstorm WarningFSDBon Homme57 min
May 7, 9:53 PM CDTSevere Thunderstorm WarningFSDCharles Mix, Gregory67 min
May 7, 10:25 PM CDTSevere Thunderstorm WarningFSDHutchinson, Turner65 min
May 7, 10:25 PM CDTSevere Thunderstorm WarningFSDClay, Lincoln65 min
May 7, 11:06 PM CDTSevere Thunderstorm WarningFSDLincoln, Minnehaha59 min
May 7, 11:06 PM CDTSevere Thunderstorm WarningFSDDouglas59 min
May 7, 11:06 PM CDTSevere Thunderstorm WarningFSDMcCook59 min
May 7, 11:32 PM CDTSevere Thunderstorm WarningFSDLincoln, Turner59 min
May 8, 6:01 PM CDTSevere Thunderstorm WarningFSDBrookings29 min
May 8, 6:07 PM CDTSevere Thunderstorm WarningFSDLincoln43 min
May 8, 6:20 PM CDTSevere Thunderstorm WarningFSDMinnehaha30 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.