Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 35, NWS Sioux Falls, SD

July 6, 1987Lake County, McCook County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 6, 1987, 10:12 PM CDT for Lake County, McCook County, South Dakota. It was in force for 48 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 10:12 PM CDT (03:12 UTC)
Expired: Jul 6, 1987, 11:00 PM CDT
In force: 48 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Lake County, SD, McCook 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

Aberdeen, SD (KHON), launched 00:00Z, 3.2 hours before the alert went out and 149 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: 2161 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 1688 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 213 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 070312
SVRFSD
SDC079-087-070415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1012 PM CDT MON JUL 6 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1100 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN EAST CENTRAL SOUTH DAKOTA
          ...SOUTHERN LAKE
IN SOUTHEAST SOUTH DAKOTA
          ...MCCOOK
 
SOME CITIES INCLUDED IN THIS
WARNING...ORLAND...KFRANKLIN...UNITYVILLE
 
AT 1010 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 40 MILES
NORTHWEST OF SIOUX FALLS NEAR CANOVA SOUTH DAKOTA MOVING EAST AT 25
MPH.
 
AT 1005 PM CDT GOLF BALL SIZE HAIL WAS REPORTED NEAR CANOVA IN MINER
COUNTY.
 
 
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES 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.
JANSEN

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, Jul 6, 4:27 PM CDT, 5 hours 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HURON SD
425 PM CDT MON JUL 6 1987

AT 420 PM CDT...SCATTERED THUNDERSTORMS WERE DEVELOPING RAPIDLY
OVER CENTRAL SOUTH DAKOTA.  THE STORMS WERE MOSTLY IN EASTERN HUGHES
AND EASTERN SULLY COUNTIES...FROM 25 MILES SOUTHEAST OF PIERRE...
TO 25 MILES NORTHEAST OF PIERRE.

THESE STORMS WILL PRODUCE HAIL...GUSTY WIND...FREQUENT LIGHTNING...
AND VERY HEAVY RAINS.  THE STORMS MAY ALSO DEVELOP ALONG THE
MISSOURI RIVER.  IF YOU ARE IN SULLY...HUGHES...OR HYDE COUNTIES...
OR IF YOU ARE IN RECREATION AREAS ALONG THE MISSOURI...YOU SHOULD
BE PREPARED TO GET TO A PLACE OF SAFETY.   IF YOU ARE BOATING
ON THE MISSOURI RIVER...YOU SHOULD BE PREPARED TO GET OFF.

KRAUSE

Special weather statement, Jul 6, 6:08 PM CDT, 4 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
607 PM CDT MON JUL 6 1987

...SEVERE THUNDERSTORM WATCH FOR EASTERN SOUTH DAKOTA
   UNTIL 11 PM CDT...

AT 6 PM CDT NATIONAL WEATER SERVICE RADARS INDICATED AN INTENSE
THUNDERSTORM IN SOUTHEASTERN TODD COUNTY. THIS THUNDERSTORM WAS
MOVING EAST NORTHEAST AT 20 MPH AND WILL BE MOVING INTO WESTERN
TRIPP COUNTY BY 7 PM CDT. STRONG WINDS...SMALL HAIL...HEAVY RAINS
AND DANGEROUS CLOUD TO GROUND LIGHTNING CAN BE EXPECTED WITH THIS
STORM.

PERSONS ACROSS EASTERN TODD AND WESTERN TRIPP COUNTIES INCLUDING
THE COMMUNITIES OF KEYA PAHA AND CLEARFIELD SHOULD KEEP ABREAST
OF THIS WEATHER SITUATION AND BE PREPARED TO GO TO A SAFE PLAGCE
IN THREATENING WEATHER APPROACHES OR IF A WARNING IS ISSUED.
JANSEN

Local storm report, Jul 6, 8:30 PM CDT, 1 hour 42 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
830 PM CDT MON JUL 7 1987

645 PM CDT   PEA SIZE HAIL AT WINNER SD IN TRIPP COUNTY.

710 PM CDT   TORNADO 2 MILES SOUTH OF CHAMBERLAIN SD IN BRULE COUNTY.
             WENT BACK UP IN CLOUD AT 715 PM CDT. NO DAMAGED REPORTED.

715 PM CDT   GOLFBALL SIZE HAIL 5 MILES SOUTH OF CHAMBERLAIN SD IN BRULE
             COUNTY.

739 PM CDT   2 LARGE FUNNEL CLOUDS 12 MILES NORTHWEST OF KIMBALL SD IN
             BRULE COUNTY.

750 PM CDT   FUNNEL CLOUD REPORTED BY PUBLIC 10 MILES NORTHEAST OF
             KIMBALL SD IN BRULE COUNTY.

751 PM CDT   PEA SIZE HAIL AND 40 TO 50 MPH WINDS 2 MILES WEST OF
             KIMBALL SD IN BRULE COUNTY.

809 PM CDT  PEA SIZE HAIL AND VERY HEAVY RAIN WITH 35 TO 45 MPH WINDS
            8 MILES EAST OF KIMBALL SD IN BRULE COUNTY.

BEHREND

Special weather statement, Jul 6, 9:01 PM CDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
900 PM CDT MON JUL 6 1987

SEVERE THUNDERSTORM WATCH NUMBER 330 IS NO LONGER IN EFFECT FOR
CAMPELL...WALWORTH...POTTER AND SULLY COUNTIES OF CENTRAL SOUTH
DAKOTA.

HOWEVER...THE WATCH CONTINUES IN EFFECT UNTIL 11 PM CDT FOR ALL
OF EASTERN SOUTH DAKOTA AND FOR EASTERN HUGHES...EASTERN LYMAN...
AND TRIPP COUNTIES OF SOUTHCENTRAL SOUTH DAKOTA.
JANSEN

Local storm report, Jul 6, 9:24 PM CDT, 48 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
923 PM CDT MON JUL 6 1987

850 PM CDT   PEA SIZE HAIL AND HEAVY RAIN 3 TO 4 MILES NORTH OF WHITE
             LAKE SOUTH DAKOTA IN AURORA COUNTY.
J
918 PM CDT   SOME SMALL HAIL...50 MPH WINDS...AND HEAVY RAIN 12 MILES
             NORTHEAST OF PLANKINTON SOUTH DAKOTA IN AURORA COUNTY.

THEOPHILUS

Special weather statement, Jul 6, 9:55 PM CDT, 17 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
940 PM CDT MON JUL 6 1987

AT 935 PM CDT...NUMEROUS INTENSE THUNDERSTORMS CONTINUE OVER
PARTS OF EASTERN SOUTH DAKOTA.

MOST OF THE THUNDERSTORM ACTIVITY WAS EAST OF A ABERDEEN/HURON/MISSION
LINE.

THE MOST INETENSE THUNDERSTORM WAS LOCATED 15 MILES NORTHEAST OF MITCHELL.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.

THESE STORMS CAN AND MAY PRODUCE HAIL...GUSTY WIND...FREQUENT LIGHTNING...
AND VERY HEAVY RAINS. IF THREATENING WEATHER APPROACHES YOU SHOULD SEEK
SAFE SHELTER.

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:12 PM CDT	Tornado Warning	FSD	Brule	48 min
Jul 6, 7:55 PM CDT	Severe Thunderstorm Warning	FSD	Aurora	65 min
Jul 6, 9:34 PM CDT	Severe Thunderstorm Warning	FSD	Davison	26 min
Jul 7, 12:33 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	37 min
Jul 7, 1:01 AM CDT	Tornado Warning	FSD	Union	29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987 Every 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.