Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 85, NWS Sioux Falls, SD

June 30, 1986Mellette County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 30, 1986, 7:59 PM CDT for Mellette County, South Dakota. It was in force for 46 min.

The area

The counties it named.

The facts

Issued: Jun 30, 1986, 7:59 PM CDT (00:59 UTC)
Expired: Jun 30, 1986, 8:45 PM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Mellette 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

Rapid City, SD (KRAP), launched 00:00Z, 1.0 hours before the alert went out and 179 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: 31 J/kg
Mixed-layer CIN: -254 J/kg
Mixed-layer LCL: 1154 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 010059
SVRFSD
SDC095-010200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
759 PM CDT MON JUN 30 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

SOUTH CENTRAL SOUTH DAKOTA...MELLETTE

SOME OF THE CITIES INCLUDED IN SOUTH CENTRAL SOUTH DAKOTA ARE
CEDAR BUTTE..WHITE RIVER AND WOOD.

AT 755 PM CDT  RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES WEST
OF WHITE RIVER SOUTH DAKOTA..OR 60 MILES NORTHWEST OF WINNER
SOUTH DAKOTA. THE SEVERE THUNDERSTORMS WAS MOVING 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

Local storm report, Jun 30, 2:24 PM CDT, 5 hours 35 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
220 PM CDT MON JUNE 30 1986

LATE REPORT...

TIME                LOCATION                        EVENT

330 TO 400 PM CDT   NORTHWEST OTF OLIVET SD    GRAPEFRUIT SIZE HAIL
                    IN HUTCHINGSON CNTY       /4 IN. DIAMETER/ RESULTED
                    ...ABOUT 30 MILES         IN CONSIDERABLE CROP
                    SOUTHEAST OF MITCHELL     DAMAGE.
KAPELA

Local storm report, Jun 30, 2:31 PM CDT, 5 hours 28 minutes before

STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SIOUX FALLS SD
230 PM CDT MON JUNE 30 1986

LATE REPORT...FROM SUNDAY JUNE 29 1986

TIME                LOCATION                        EVENT

330 TO 400 PM CDT   NORTHWEST OF OLIVET SD    GRAPEFRUIT SIZE HAIL
                    IN HUTCHINGSON CNTY       /4 IN. DIAMETER/ RESULTED
                    ...ABOUT 30 MILES         IN CONSIDERABLE CROP
                    SOUTHEAST OF M[ITCHELL     DAMAGE.
KAPELA

Special weather statement, Jun 30, 7:48 PM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
745 PM CDT MON JUN 30 1986

...SEVERE THUNDERSTORM WATCH SOUTH CENTRAL INTO EXTREME SOUTHWEST
UNTIL 1 AM CDT...

AT 740 PM CDT SEVERAL INTENSE THUNDERSTORMS WERE MOVING FAIRLY
RAPIDLY EAST INTO SOUTH/CENTRAL SOUTH DAKOTA. ONE INTENSE THUNDER/
STORM WAS NEAR WHITE RIVER WHICH IS ABOUT 50 MILES WEST/NORTHWEST
OF WINNER SOUTH DAKOTA..AND ANOTHER INTENSE THUNDERSTORM WAS ABOUT
25 MILES WEST OF WHITE RIVER. BOTH OF THE THUNDERSTORMS WERE MOVING
EAST THROUGH MELLETTE COUNTY AT 30 MPH AND ARE CAPABLE OF PRODUCING
HEAVY RAINS..STRONG WINDS..AND HAIL. THESE THUNDERSTORMS SHOULD BE
MOVING INTO TODD AND TRIPP COUNTIES BY 9 PM CDT.

RYRHOLM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:39 PM CDT	Severe Thunderstorm Warning	FSD	Moody	55 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.