Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 69, NWS Sioux Falls, SD

July 11, 1987Bon Homme County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 11, 1987, 2:00 AM CDT for Bon Homme County, South Dakota. It was in force for 60 min. 1 report 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 11, 1987, 2:00 AM CDT (07:00 UTC)
Expired: Jul 11, 1987, 3:00 AM CDT
In force: 60 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Bon Homme 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 11, 3:00 AM CDT	Thunderstorm Wind 64	Bon Homme, 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

Aberdeen, SD (KHON), launched 00:00Z, 7.0 hours before the alert went out and 217 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: 3304 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1012 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 110700
SVRFSD
SDC023-053-009-110800-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
200 AM CDT SAT JUL 11 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  300 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL SOUTH DAKOTA
          ...SOUTHERN CHARLES-MIX...SOUTHEASTERN GREGORY
IN SOUTHEAST SOUTH DAKOTA
          ...WESTERN BON-HOMME
 
SOME OF THE CITIES INCLUDED ARE BONESTEEL...PICKSTOWN...LAKE ANDES...
SPRINGFIELD...TYNDALL.
 
AT 155 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 85 MILES WEST OF
YANKTON SOUTH DAKTA NEAR BUTTE NEBRASKA. THE THUNDERSTORM WAS MOVING
EASTNORTHEAST AT 30 MPH.
 
THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.
 
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.
 
THUNDERSTORMS 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

Special weather statement, Jul 10, 10:43 PM CDT, 3 hours 17 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1035 PM CDT FRI JUL 10 1987

...TORNADO WATCH UNTIL 1100 PM CDT FOR PORTIONS OF CENTRAL AND NORTHEAST
SOUTH DAKOTA...

AT 1030 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
AND HAIL CONTINUED OVER NORTHEASTERN SOUTH DAKOTA AND SOUTHEASTERN
NORTH DAKOTA.

IN NORTHEASTERN SOUTH DAKOTA...THE THUNDERSTORMS WERE LOCATED ALONG AND
30 MILES EITHER SIDE OF A LINE FROM REDFIELD...30 MILES SOUTH OF ABERDEEN
TO SISSETON...45 MILES NORTH OF WATERTOWN.

THE STRONGEST THUNDERSTORMS WERE JUST SOUTHWEST OF REDFIELD...30 MILES
SOUTH OF ABERDEEN AND NEAR LAKE CITY...45 MILES NORTH OF WATERTOWN. THESE
THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING
AND HAIL.
OTHERWISE...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN HAD BEGUN
TO DEVELOP OVER SOUTH CENTRAL SOUTH DAKOTA AND NORTH CENTRAL NEBRASKA.

THE DEVELOPING THUNDERSTORMS WERE LOCATED ALONG AND 20 MILES
EITHER SIDE OF A LINE FROM 70 MILES SOUTHEAST OF RAPID CITY...IN
BENNETT COUNTY TO 40 MILES WEST OF PIERRE...IN WESTERN STANLEY COUNTY.

ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR.
EDDY

Special weather statement, Jul 10, 11:40 PM CDT, 2 hours 20 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1135 PM CDT FRI JUL 10 1987

...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTH CENTRAL AND SOUTH
EASTERN SOUTH DAKOTA UNTIL 500 AM CDT SATURDAY MORNING...

AT 1130 PM CDT...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
AND HAIL CONTINUED TO DEVELOP OVER SOUTH CENTRAL SOUTH DAKOTA AND
NORTH CENTRAL NEBRASKA.

THE AREA OF THUNDERSTORMS WAS LOCATED ALONG AND WEST OF A LINE FROM PIERRE
TO 40 MILES SOUTHWEST OF WINNER...NEAR MISSION.

OTHERWISE...SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL
CONTINUED OVER EXTREME NORTHEASTERN SOUTH DAKOTA...SOUTHEASTERN NORTH
DAKOTA AND MOVED INTO WESTERN MINNESOTA.

IN SOUTH DAKOTA...THIS AREA OF THUNDERSTORMS WAS LOCATED ALONG AND 10 MILES
EITHER SIDE OF A LINE FROM WATERTOWN TO 60 MILES NORTH OF WATERTOWN...NEAR

ROSHOLT.

THE STRONGEST THUNDERSTORMS WERE 30 MILES SOUTHWEST OF WINNER...
NEAR MISSION...40 MILES NORTH OF WATERTOWN...NEAR PEEVER AND
20 MILES NORTHEAST OF WATERTOWN...NEAR WILMOT. THESE THUNDERSTORMS
ARE CAPABLE OF PRODUCING STRONG GUSTY WINDS...FREQUENT LIGHTNING AND
HAIL. IF YOU ARE IN THE PATH OF THESE STORMS YOU SHOULD SEEK SHELTER.

ALL MOVEMENT WAS EAST AT 30 MILES AN HOUR.

EDDY

Local storm report, Jul 11, 12:03 AM CDT, 1 hour 57 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
1155 PM CDT FRI JUL 10 1987

445 PM CDT...21 MILES WEST OF PIERRE SD...LARGE AMOUNT OF MARBLE
             SIZE HAIL.
453 PM CDT...25 MILES WEST OF PIERRE SD...GOLFBALL SIZE HAIL...
             30 MPH WIND.
453 PM CDT...25 MILES WSW OF PIERRE SD...TORNADO REPORTED BY A
             SPOTTER. ALSO GOLF BALL SIZE HAIL.
520 PM CDT...45 MILES SOUTHWEST OF PIERRE SD...FUNNEL CLOUD ORTED
             BY AN OFF DUTY NWS OBSERVER.
530 PM CDT...25 MILES NORTHWEST OF PIERRE SD...PEA SIZE HAIL.
544 PM CDT...20 MILES NORTHEAST OF PIERRE SD...FUNNEL CLOUD REPORTED
             BY THE PUBLIC NEAR ONIDA.
551 PM CDT...30 MILES WEST OF PIERRE SD...BASEBALL SIZE HAIL COVERING
             THE GROUND.
554 PM CDT...40 MILES SOUTHWEST OF PIERRE SD...QUARTER SIZE HAIL.
604 PM CDT...20 MILES NORTHEAST OF PIERRE SD...FUNNEL CLOUD.
605 PM CDT...30 MILES WEST OF PIERRE SD...11/2 TO 13/4 INCH HAIL.

935 PM CDT...70 NORTHEAST OF PIERRE SD...PEA SIZE HAIL...HEAVY RAIN
             AND WIND LESS THAN 25 MPH.

SPRINGER

Special weather statement, Jul 11, 12:50 AM CDT, 1 hour 10 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1240 AM CDT SAT JUL 11 1987

...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTH CENTRAL AND SOUTH
EASTERN SOUTH DAKOTA UNTIL 500 AM CDT SATURDAY MORNING...

AT 1230 AM CDT...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER SOUTH
CENTRAL SOUTH DAKOTA...MAINLY IN THE AREA ALONG AND WEST OF THE MISSOURI
RIVER AND SOUTH OF A LINE FROM CHAMBERLAIN TO WINNER.

VERY HEAV4Y RAIN...HAIL...AND STRONG WIND ARE LIKELY WITH THESE STORMS.

MOVEMENT WAS EAST AT 20 MILES AN HOUR.

SPRINGER

Special weather statement, Jul 11, 1:48 AM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
140 AM CDT SAT JUL 11 1987

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 5 AM CDT FOR SOUTH
CENTRAL AND SOUTHEAST SOUTH DAKOTA...

AT 130 AM CDT...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER SOUTH
CENTRAL SOUTH DAKOTA...MAINLY IN THE AREA ALONG AND 25 MILES EITHER
SIDE OF THE MISSOURI RIVER FROM PIERRE TO THE NEBRASKA LINE.

THE STRONGEST STORM IS NEAR PICKSTOWN...WHICH IS 50 MILES WEST OF
YANKTON.

HAIL...STORNG WIND AND VERY HEAVY RAIN IS LIKELY WITH THIS STORM.

SPRINGER

Special weather statement, Jul 11, 1:54 AM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
150 AM CDT SAT JUL 11 1987

...SCATTERED THUNDERSTORMS...SOME OF THEM INTENSE...WERE OVER SOUTH
CENTRAL AND SOUTHEAST SOUTH DAKOTA...

AT 145 AM CDT RADAR INDICATED SCATTERED SHOWERS AND THUNDERSTORMS
IN A 80 MILES WIDE AREA FROM 85 MILES NORTHEAST OF SIOUX FALLS NEAR
WILLOW LAKE SOUTH DAKOTA TO 140 MILES SOUTHWEST NEAR ATKINSON NEBRASKA.
IN SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA THE MOST INTENSITY
THUNDERSTORMS WERE NEAR THE NEBRASKA BORDER FROM GREGORY TO TYNDALL.
THESE WAS ALSO AN INTENSITY THUNDERSTORM IN NORTHEAST NEBRASKA 10 MILES
SOUTHWEST OF BUTTE OR 85 MILES WEST OF YNAKTON SOUTH DAKOTA. ALL THE
SHOWERS AND THUNDERSTORMS WERE MOVING EASTNORTHEAST AT 30 MPH.

VERY HEAVY RAIN...HAIL AND STRONG WINDS ARE POSSIBLE WITH THE INTENSE
THUNDERSTORMS. SEVERE THUDERSTORMS ARE ALSO POSSIBLE THIS MORNING
AND PEOPLE THROUGHOUT SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA ARE
ADVISED TO BE ALERT...ESPECIALLY THOSE ALONG THE NEBRASKA BORDER.
BEHREND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 11:01 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	59 min
Jul 11, 2:00 AM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	60 min
Jul 11, 2:23 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Douglas, Hanson, Hutchinson	67 min
Jul 11, 2:37 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake	68 min
Jul 11, 2:55 AM CDT	Severe Thunderstorm Warning	FSD	Turner, Yankton	65 min
Jul 11, 2:55 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	65 min
Jul 11, 3:16 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook	59 min
Jul 11, 3:46 AM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	59 min
Jul 11, 3:46 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln	59 min
Jul 11, 4:35 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	55 min
Jul 11, 5:00 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.