Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 57, NWS Sioux Falls, SD

July 9, 1987Clay County, Lincoln County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 1987, 10:23 PM CDT for Clay County, Lincoln County, South Dakota. It was in force for 52 min.

The area

The counties it named.

The facts

Issued
Jul 9, 1987, 10:23 PM CDT (03:23 UTC)
Expired
Jul 9, 1987, 11:15 PM CDT
In force
52 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

Counties Clay County, SD, Lincoln 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

Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 201 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 1987-07-10Temperature 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 1987-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
3634 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
101 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 100323
SVRFSD
SDC083-027-125-100430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1023 PM CDT THU JUL 9 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

SOUTHEAST SOUTH DAKOTA...LINCOLN...NORTHERN CLAY AND EASTERN TURNER

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE PARKER...LENNOX
...CENTERVILLE...WADONKA.

AT 1015 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
ROM 25 MILES SOUTHWEST OF SIOUX FALLS TO 15 MILES NORTHEAST OF
YANKTON SOUTH DAKOTA 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 LFOW LYING AREA.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

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 9, 7:58 PM CDT, 2 hours 25 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
758 PM CDT THU JUL 9 1987

434 PM CDT   EXTREME NORTHWESTERN JONES COUNTY...AT CAPA...OR ABOUT
             30 MILES SOUTHWEST OF PIERRE.  GOLFBALL SIZE HAIL.
             REPORTED BY STANLEY COUNTY ASSISTANT CIVIL DEFENSE.

445 PM CDT   SOUTHWESTERN STANLEY COUNTY...7 MILES EAST OF HAYES...
             OR ABOUT 25 MILES WEST OF PIERRE.  NICKEL SIZE HAIL.
             BEGAN HAILING AT 415 PM CDT.  REPORTED BY SEVERE WEATHER
             SPOTTER.

628 PM CDT   NORTHERN SULLY COUNTY...ABOUT 30 MILES NORTHEAST OF PIERRE.
             TREES BENT OVER ALOT...WINDS ESTIMATED AT 55 TO 70 MPH.
             REPORTED BY SEVERE WEATHER SPOTTER.

630 PM CDT   TORNADO IN SOUTHEASTERN LYMAN COUNTY...14 MILES WEST OF
             CHAMBERLAIN...OR ABOUT 25 MILES NORTHEAST OF WINNER.
             IT TOOK DOWN A STEEL BARN...STEEL POLE SHED...AND A
             CALF SHELTER.  REPORTED BY SEVERE WEATH6ER SPOTTER
             AT 645 PM CDT.

KRAUSE
Special weather statement, Jul 9, 8:44 PM CDT, 1 hour 39 minutes before
KHON 100047

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
843 PM CDT THU JUL 9 1987

...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF EASTERN SOUTH
DAKOTA AND PART OF SOUTHWESTERN MINNESOTA UNTIL 200 AM CDT FRIDAY
MORNING...

AT 830 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
EXTENDED ACROSS PORTIONS OF SOUTHEASTERN SOUTH DAKOTA. THESE THUNDER-
STORMS WERE IN A 15 MILE WIDE LINE EXTENDING FROM 25 MILES SOUTH OF
HURON TO 60 MILES WEST OF YANKTON...NEAR PICKSTOWN...AND EXTENDING
INTO NORTHERN NEBRASKA

THERE WAS ALSO NUMEROUS INTENSE THUNDERSTORMS IN NORTHEASTERN SOUTH
DAKOTA...MOSTLY IN A 60 MILE WIDE AREA BETWEEN WATERTOWN AND ABERDEEN.

THESE ARE VERY STRONG STORMS AND STRONG GUSTY WINDS AND HAIL...ALONG
WITH VERY HEAVY RAIN IS POSSIBLE.

MOVEMENT WAS TOWARD THE EAST AT 30 MILES AN HOUR.
ORGISH
Special weather statement, Jul 9, 9:34 PM CDT, 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
930 PM CDT THU JUL 9 1987

...TORNADO WATCH FOR EASTERN SOUTH DAKOTA UNTIL 200 AM CDT...

AT 925 AM CDT...A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED
FROM 20 MILES NORTH OF WATERTOWN SOUTH DAKOTA TO 45 MILES NORTHWEST
OF YANKTON. THIS LINE OF THUNDERSTORMS WAS 40 MILES WIDE AND WAS MOVING
EAST AT 30 MPH.

SEVERE WEATHER HAS NOT BEEN REPORTED WITH THIS LINE OF THUNDERSTORMS
IN THE PAST HOUR. HOWEVER...STRONG WINDS...BRIEF HEAVY RAINS AND SMALL
HAIL CAN BE EXPECTED WITH THESE THUNDERSTORMS.

THIS LINE WILL BE ENTERING THE SIOUX FALLS AREA BY 1000 PM CDT.

PERSONS IN THE PATH OF THESE THUNDERSTORMS SHOULD BE ON THE LOOKOUT
FOR THREATENING WEATHER CONDITIONS.

ANDERSON
Special weather statement, Jul 9, 9:34 PM CDT, 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
930 PM CDT THU JUL 9 1987

...TORNADO WATCH FOR EASTERN SOUTH DAKOTA UNTIL 200 AM CDT...

AT 925 PM CDT...A LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED
FROM 20 MILES NORTH OF WATERTOWN SOUTH DAKOTA TO 45 MILES NORTHWEST
OF YANKTON. THIS LINE OF THUNDERSTORMS WAS 40 MILES WIDE AND WAS MOVING
EAST AT 30 MPH.

SEVERE WEATHER HAS NOT BEEN REPORTED WITH THIS LINE OF THUNDERSTORMS
IN THE PAST HOUR. HOWEVER...STRONG WINDS...BRIEF HEAVY RAINS AND SMALL
HAIL CAN BE EXPECTED WITH THESE THUNDERSTORMS.

THIS LINE WILL BE ENTERING THE SIOUX FALLS AREA BY 1000 PM CDT.

PERSONS IN THE PATH OF THESE THUNDERSTORMS SHOULD BE ON THE LOOKOUT
FOR THREATENING WEATHER CONDITIONS.

ANDERSON
Special weather statement, Jul 9, 9:42 PM CDT, 41 minutes before
KHON 100047

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
942 PM CDT THU JUL 9 1987

...A TORNADO WATCH IS IN EFFECT FOR A LARGE PART OF EASTERN SOUTH
DAKOTA AND PART OF SOUTHWESTERN MINNESOTA UNTIL 200 AM CDT FRIDAY
MORNING...

AT 930 PM CDT...A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
EXTENDED ACROSS PORTIONS OF SOUTHEASTERN SOUTH DAKOTA. THESE THUNDER-
STORMS WERE IN A 35 MILE WIDE LINE EXTENDING FROM 70 MILES NORTHEAST
OF WATERTOWN...NEAR THE NORTH DAKOTA BORDER...TO 35 MILES WEST OF
YANKTON...AND INTO NORTHERN NEBRASKA.

THESE ARE VERY STRONG STORMS AND STRONG GUSTY WINDS AND HAIL...ALONG
WITH VERY HEAVY RAIN IS POSSIBLE.

THE #THUNDERSTORMS WERE MOVING SOUTHEAST AT 30 MILES AN HOUR.
ORGISH
Special weather statement, Jul 9, 9:59 PM CDT, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
955 PM CDT THU JUL 9 1987

THE TORNADO WATCH FOR BROWN...HAND...AND EASTERN FAULK COUNTIES
IN SOUTH DAKOTA HAS BEEN CANCELLED. THE RE6MAINDER THE WATCH IS
STILL IN EFFECT UNTIL 2 AM CDT.

RYRHOLM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 7:36 PM CDTSevere Thunderstorm WarningFSDAurora, Brule, Charles Mix54 min
Jul 9, 7:36 PM CDTSevere Thunderstorm WarningFSDGregory54 min
Jul 9, 8:07 PM CDTSevere Thunderstorm WarningFSDAurora, Davison, Douglas53 min
Jul 9, 9:39 PM CDTTornado WarningFSDHutchinson, Turner36 min
Jul 9, 9:47 PM CDTSevere Thunderstorm WarningFSDTurner43 min
Jul 9, 10:16 PM CDTSevere Thunderstorm WarningFSDBrookings59 min
Jul 9, 10:23 PM CDTSevere Thunderstorm WarningFSDTurner27 min
Jul 10, 12:00 AM CDTSevere Thunderstorm WarningFSDTodd, Tripp60 min
Jul 10, 2:06 AM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix54 min
Jul 10, 6:51 AM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix54 min
Jul 10, 3:56 PM CDTSevere Thunderstorm WarningFSDMellette64 min
Jul 10, 4:05 PM CDTTornado WarningFSDMellette25 min
Jul 10, 4:28 PM CDTTornado WarningFSDMellette32 min
Jul 10, 4:38 PM CDTSevere Thunderstorm WarningFSDTodd67 min
Jul 10, 4:59 PM CDTSevere Thunderstorm WarningFSDMellette61 min
Jul 10, 5:42 PM CDTSevere Thunderstorm WarningFSDTodd, Tripp63 min
Jul 10, 6:42 PM CDTSevere Thunderstorm WarningFSDTodd, Tripp63 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987Every severe thunderstorm warning in 1987

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.