Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 39, NWS Sioux Falls, SD

July 7, 1987Lincoln County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 7, 1987, 12:33 AM CDT for Lincoln County, South Dakota. It was in force for 37 min.

The area

The counties it named.

The facts

Issued: Jul 7, 1987, 12:33 AM CDT (05:33 UTC)
Expired: Jul 7, 1987, 1:10 AM CDT
In force: 37 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County 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, 5.6 hours before the alert went out and 220 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: 3581 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 112 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 070539 COR
SVRFSD
IAC119-167-SDC083-070630-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1233 AM CDT TUE JUL 7 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  130 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...

IN NORTHWEST IOWA
          ...WESTERN LYON...WESTERN SIOUX
IN SOUTHEAST SOUTH DAKOTA
          ...EASTERN LINCOLN

SOME CITIES INCLUDED IN THIS WARNING...HUDSON...CANTON...SIOUX CENTER
AND LESTER.

AT 1230 AM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 10
MILES SOUTH OF SIOUX FALLS TO 30 MILES SOUTH OF SIOUX FALLS. THE LINE
WAS MOVING EAST AT 30 MPH.
PEA TO MARBLE SIZE HAIL COVERED THE GROUND IN BERESFORD SOUTH DAKOTA
AT 1220 AM CDT.

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

Local storm report, Jul 6, 9:24 PM CDT, 3 hours 9 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, 2 hours 38 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

Special weather statement, Jul 6, 10:31 PM CDT, 2 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1030 PM CDT MON JUL 6 1987

AT 1030 PM CDT INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
CONTINUED ACROSS A LARGE PORTION OF SOUTHEAST SOUTH DAKOTA.

THE STORMS EXTENDED FROM 40 MILES SOUTHWEST OF SIOUX FALLS...NEAR
FREEMAN TO 35 MILES NORTH OF SIOUX FALLS...NEAR MADISON.
THE STRONGEST THUNDERSTORMS WERE LOCATED BETWEEN BRIDGEWATER
AND HOWARD.

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN THAT
COULD FLOOD LOW LYING AREAS...HAIL...DANGEROUS LIGHTNING...AND
STRONG WINDS OF 40 TO 50 MILES AN HOUR AS THEY MOVE EAST AT 20 MILES
AN HOUR.

PERSONS IN THE SOUTH DAKOTA COUNTIES OF HUTCHINSON...MCCOOK...LAKE
...MINNEHAHA INCLUDING THE COMMUNITIES OF FREEMAN...BRIDGEWATER...
SALEM AND SIOUX FALLS SHOULD BE ON THE LOOKOUT FOR THESE STORMS
UNTIL MIDNIGHT.

STAY TUNED TO YOUR LOCAL RAIO AND TV STATION FOR FURTHER STATEMENTS
OR POSSIBLE WARNINGS.
BUSS

Special weather statement, Jul 6, 11:42 PM CDT, 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1140 PM CDT MON JUL 6 1987

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 4 AM CDT FOR EXTREME
SOUTHEAST SOUTH DAKOTA...SOUTHWEST MINNESOTA AND NORTHWEST IOWA...

AT 1135 PM CDT RADAR INDICATED A LINE OF INTENSE THUNDERSTORMS
FROM NEAR PIPESTONE MINNESOTA SOUTHWEST THROUGH SIOUX FALLS
TO YANKTON SOUTH DAKOTA AND INTO NORTHEAST NEBRASKA.

THE HEAVIEST THUNDERSTORMS WERE LOCATED 15 MILES NORTHEAST OF
SIOUX FALLS NEAR GARRETSON...10 MILES SOUTHWEST OF SIOUX FALLS
NEAR LENNOX...15 MILES NORTHEAST OF YANKTON AND JUST SOUTH OF
FREEMAN SOUTH DAKOTA.

THSE THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...
SMALL HAIL...HEAVY RAINS AND DANGEROUS CLOUD TO GROUNG LIGHTNING.
THIS LINE OF STORMS WAS MOVING EAST AT 20 MPH AND WILL BE AFFECTING
CLAY AND LINCOLN COUNTIES OF SOUTH DAKOTA...ROCK COUNTY OF SOUTHWEST
MINNESOTA AND LYON COUNTY OF NORTHWEST IOWA BY 1P230 AM CDT.

PERSON ACROSS SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND SOUTHWEST
MINNESOTA SHOULD KEEP ABREAST OF THIS WEATHER SITUATION AND BE
PREPARED TO SEEK SHELTER IF A WARNING IS ISSUED.
JANSEN

Local storm report, Jul 7, 12:22 AM CDT, 11 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1220 PM CDT TUE JUL 7 1987

949 PM CDT   PEA SIZE HAIL AND HEAVY RAIN NEAR MITCHELL SOUTH DAKOTA.
             (DAVISON COUNTY)

1007 PM CDT  GUST TO 41 MPH AT THE SIOUX FALLS AIRPORT.
             (MINNEHAHA COUNTY)

1155 PM CDT  52 MPH WINDS AT VERMILLION SOUTH DAKOTA.
             (CLAY COUNTY)

1217 AM CDT  PEA TO MARBLE SIZE HAIL COVERING GROUND AT BERESFORD
             SOUTH DAKOTA. (pLINCOLN COUNTY)

JANSEN

Local storm report, Jul 7, 12:23 AM CDT, 10 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1220 AM CDT TUE JUL 7 1987

949 PM CDT   PEA SIZE HAIL AND HEAVY RAIN NEAR MITCHELL SOUTH DAKOTA.
             (DAVISON COUNTY)

1007 PM CDT  GUST TO 41 MPH AT THE SIOUX FALLS AIRPORT.
             (MINNEHAHA COUNTY)

1155 PM CDT  52 MPH WINDS AT VERMILLION SOUTH DAKOTA.
             (CLAY COUNTY)

1217 AM CDT  PEA TO MARBLE SIZE HAIL COVERING GROUND AT BERESFORD
             SOUTH DAKOTA. (qLINCOLN COUNTY)

JANSEN

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 6, 10:12 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook	48 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.