Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 55, NWS Sioux Falls, SD

July 9, 1987Brookings County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 9, 1987, 10:16 PM CDT for Brookings County, South Dakota. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: Jul 9, 1987, 10:16 PM CDT (03:16 UTC)
Expired: Jul 9, 1987, 11:15 PM CDT
In force: 59 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Brookings 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, 3.3 hours before the alert went out and 140 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: 3310 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 21.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 100316
SVRFSD
SDC011-100415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1016 PM CDT THU JUL 9 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1115 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN EAST CENTRAL SOUTH DAKOTA
          ...BROOKINGS
 
AT 1015 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES WEST
OF BROOKINGS MOVING EAST AT 30 MPH.
 
SOME CITIES INCLUDED IN THIS WARNING ARE...BROOKINGS...WHITE.
 
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 LAIGHTNING...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.
 
ANDERSON

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 18 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 32 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, 42 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, 42 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, 34 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, 17 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.

Issued	Product	Office	Counties	Lasted
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix	54 min
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	54 min
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas	53 min
Jul 9, 9:39 PM CDT	Tornado Warning	FSD	Hutchinson, Turner	36 min
Jul 9, 9:47 PM CDT	Severe Thunderstorm Warning	FSD	Turner	43 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Turner	27 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln	52 min
Jul 10, 12:00 AM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	60 min
Jul 10, 2:06 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	54 min
Jul 10, 6:51 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	54 min
Jul 10, 3:56 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	64 min
Jul 10, 4:05 PM CDT	Tornado Warning	FSD	Mellette	25 min
Jul 10, 4:28 PM CDT	Tornado Warning	FSD	Mellette	32 min
Jul 10, 4:38 PM CDT	Severe Thunderstorm Warning	FSD	Todd	67 min
Jul 10, 4:59 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	61 min
Jul 10, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 min
Jul 10, 6:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 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.