Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 91, NWS Sioux Falls, SD

July 10, 1986Clay County, Turner County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 10, 1986, 10:45 PM CDT for Clay County, Turner County, South Dakota. It was in force for 60 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: Jul 10, 1986, 10:45 PM CDT (03:45 UTC)
Expired: Jul 10, 1986, 11:45 PM CDT
In force: 60 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Clay County, SD, Turner 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

Time	Report	Where	Remark
Jul 10, 11:01 PM CDT	Thunderstorm Wind 52	Clay, SD
Jul 10, 11:20 PM CDT	Thunderstorm Wind 0	Turner, 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, 3.8 hours before the alert went out and 207 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3595 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 84 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 110345
SVRFSD
SDC027-125-110445-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1045 PM CDT THU JUL 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1145 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST SOUTH DAKOTA...CLAY AND TURNER

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN SOUTHEAST SOUTH DAKOTA ARE
VERMILLION..PARKER AND CENTERVILLE.

AT 1040 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
EXTENDED FROM NEAR VERMILLION TO FREEMAN..OR 30 MILES NORTH OF
YANKTON.

 AT 1039 PM CDT 50 MPH WINDS WERE REPORTED NEAR ONE QUARTER MILE
SOUTH OF MECKLING...OR 10 MILES NORTHWEST OF VERMILLION.

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 LAR!GER..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

Local storm report, Jul 10, 9:13 PM CDT, 1 hour 32 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
915 PM CDT THU JUL 10 1986

TIME                LOCATION                        EVENT

753 TO 813 PM CDT   CHAMBERLAIN AMOS WEATHER  WIND GUSTS TO 61 :MPH.
                    OBSERVATION STATION       RAINFALL OF 0.95 BETWEEN
                                              730 PM CDT AND 9 PM CDT

UMLAND

Special weather statement, Jul 10, 10:27 PM CDT, 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
1025 PM CDT THU JUL 10 1986

...STRONG THUNDERSTORMS MOVING INTO THE SIOUXLAND AREA...

AT 1010 PM RADAR SHOWED A LINE OF INTENSE THUNDERSTORMS LOCATED FROM
YANKTON SOUTH DAKOTA...55 NORTHWEST OF SIOUX CITY TO 20 MILES WEST OF
NORFOLK NEBRASKA. THESE STORMS WERE MOVING SOUTHEAST AT 30 MILES AN
HOUR.

THESE STORMS WILL LIKEY PRODUCE VERY HEAVY RAIN..WIND GUSTS TO 50 MILES
AN/ HOUR AND SMALL HAIL. PERSONS IN DIXON COUNTY ESPECIALLY PEOPLE IN
THE TOWNS OF DIXON AND CONCORD SHOULD BE ON THE LOOKOUT FOR THIS LINE
OF STORMS AS THEY MOVE INTO THE AREA BETWEEN 11 PM AND MIDNIGHT.

TANNER

Special weather statement, Jul 10, 10:29 PM CDT, 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1030 PM CDT THU JUL 10 1986

...SEVERE THUNDERSTORM WATCH TIL 300 AM CDT FOR SOUTHEAST SOUTH DAKOTA
AND ADJACENT PORTIONS OF SOUTHWEST MINNESOTA AND NORTHWEST IOWA...

AT 1020 PM CDT RADAR INDICATED A LINE OF INTENSE THUNDERSTORMS WHICH
EXTENDED FROM YANKTON TO ALEXANDRIA TO BROOKINGS. THESE INTENSE
THUNDERSTORMS WERE PRODUCING VERY HEAVY RAIN..STRONG WINDS TO AROUND
40 MPH AND SMALL HAIL. THESE INTENSE THUNDERSTORMS WERE MOVING EAST AT
25 MPH AND WILL AFFECT THE CITIES OF VERMILLION..SIOUX FALLS AND
CANTON BETWEEN 1045 PM CDT AND 1145 PM CDT.

THE SEVERE THUNDERSTORM WARNING THAT WAS IN EFFECT FOR MOODY COUNTY
UNTIL 1030 PM CDT HAS EXPIRED. THE THUNDERSTORMS IN THAT AREA HAVE
DECREASED IN INTENSITY. THE SEVERE WARNING IN EFFECT UNTIL 1100 PM
CDT FOR ROCK COUNTY AND SOUTHERN PIPESTONE COUNTY IN MINNESOTA REMAINS
IN EFFECT UNTIL 1100 PM CDT.
WEILAND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 8:22 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	58 min
Jul 10, 9:25 PM CDT	Severe Thunderstorm Warning	FSD	Moody	65 min
Jul 10, 10:53 PM CDT	Severe Thunderstorm Warning	FSD	Union	62 min
Jul 10, 11:06 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	54 min
Jul 10, 11:08 PM CDT	Severe Thunderstorm Warning	FSD	Moody	67 min
Jul 10, 11:36 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	69 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.