Alert archive / South Dakota / Tornado Warnings in 1987

Tornado Warning 20, NWS Aberdeen, SD

August 1, 1987Brown County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Aug 1, 1987, 1:17 AM CDT for Brown County, South Dakota. It was in force for 28 min.

The area

The counties it named.

The facts

Issued: Aug 1, 1987, 1:17 AM CDT (06:17 UTC)
Expired: Aug 1, 1987, 1:45 AM CDT
In force: 28 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Brown 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, 6.3 hours before the alert went out and 77 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: 2890 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 2250 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 60 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 010617
TORABR
SDC013-010645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
117 AM CDT SAT AUG 1 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHEAST SOUTH DAKOTA...EAST CENTRAL BROWN

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE COLUMBIA AND
PUTNEY.

AT 115 AM CDT  A TORNADO WAS REPORTED 10 NORTHEAST OF ABERDEEN
MOVING EAST.

IF YOU ARE IN THE PATH OF THIS TORNADO...YOU SHOULD GO TO A BASEMENT
SHELTER IF AVAILABLE. OTHERWISE GO TO A CENTRAL INTERIOR ROOM ON THE
LOWEST FLOOR POSSIBLE. CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR4
A REINFORCED BUILDING.

STUDNICKA

What forecasters said that day

The local office's own words before this tornado 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 31, 8:00 PM CDT, 5 hours 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
700 PM MDT FRI JUL 31 1987

...INTENSE THUNDERSTORMS DEVELOPING RAPIDLY IN NORTH CENTRAL AND
   NORTHWEST SOUTH DAKOTA...

AT 655 PM MDT RADAR INDICATED A VERY INTENSE THUNDERSTORM ALONG THE
DEWEY AND ZIEBACH COUNTY LINE ON THE MOREAU RIVER OR 55 MILES SOUTH
WEST OF MOBRIDGE SOUTH DAKOTA MOVING NORTHEAST AT 25 MPH.

PERSONS WITHIN THE TIMBER LAKE...GLENCROSS...TRAIL CITY AND WHITEHORSE
COMMUNITIES OF DEWEY COUNTY IN NORTH CENTRAL SOUTH DAKOTA SHOULD BE
PREPARED FOR ADVERSE WEATHER FOR THE NEXT 2 HOURS.

STRONG WIND OF 45 TO 55 MPH IS POSSIBLE WITH THE PASSAGE OF THIS STORM
ALONG WITH VERY HEAVY RAIN AND SMALL HAIL.
 STUDNICKA

Local storm report, Jul 31, 9:37 PM CDT, 3 hours 40 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
935 PM CDT FRI JUL 31 1987

STORM DATA FOR FRIDAY JULY 31 1987

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 810 PM MDT     DEWEY...ISABEL             HEAVY RAIN WITH 40 MPH WIND.

 810 PM MDT     DEWEY...TIMBER LAKE        VERY HEAVY RAIN...MINOR
                                           ROAD FLOODING...SMALL HAIL.
 STUDNICKA

Local storm report, Jul 31, 10:38 PM CDT, 2 hours 39 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1035 PM CDT FRI JUL 31 1987

STORM DATA FOR FRIDAY JULY 31 1987

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 840 PM MDT     DEWEY...ISABEL             1.50 TO 2.00 INCHES OF
                                           RAIN IN A ONE AND ONE HALF
                                           HOUR TIME SPAN.
 855 PM MDT     CORSON...25 MILES WEST     PUBLIC REPORTED A FUNNEL.
                OF MOBRIDGE.
 STUDNICKA

Local storm report, Jul 31, 11:22 PM CDT, 1 hour 55 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1120 PM CDT FRI JUL 31 1987

STORM DATA FOR FRIDAY JULY 31 1987

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 1102 PM CDT    POTTER...16WSW OF          NEAR ZERO VISIBILITY IN
                GETTYSBURG.                BLOWING DUST WITH WIND OF
                                           55 MPH.
 1110 PM CDT    POTTER...S. WHITLOCK       PUBLIC SIGHTING OF A
                CROSSING RT 212.           FUNNEL OVER THE MISSOURI
                                           RIVER.
 1115 PM CDT    POTTER...GETTYSBURG.       50 MPH WIND AND HEAVY RAIN.
 STUDNICKA

Local storm report, Aug 1, 12:15 AM CDT, 1 hour 2 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1215 AM CDT SAT AUG 1 1987

STORM DATA FOR FRI JUL 31 1987

 TIME            COUNTY..LOCATION           CHARACTER OF STORM..DAMAGE
.......................................................................

 1045 PM CDT    POTTER...GETTYSBURG.       PART OF THE OUTDOOR DRIVE IN
                                           MOVIE SCREAN WAS REMOVED BY
                                           THE WIND.
 1105 PM CDT    WALWORTH...MOBRIDGE.       RADIO STATION KOLY AT
                                           MOBRIDGE REPORTED WIND
                                           GUST TO 52 MPH.
  STUDNICKA

Special weather statement, Aug 1, 12:56 AM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1255 AM CDT SAT AUG 1 1987

AT 1250 AM CDT RADAR INDICATED A VERY INTENSE THUNDERSTORM OVER
EAST EDMUNDS COUNTY OR 35 MILES WEST OF ABERDEEN MOVING EAST AT
25 MPH.

RECENT REPORTS OF VERY STRONG WIND IN EXCESS OF 50 MPH HAS BEEN
RECEIVED HERE AT THE REGIONAL AIRPORT FROM A WEATHER SPOTTER 12
MILES WEST OF WARNER IN EXTREME SOUTHWEST BROWN COUNTY AND FROM
A WEATHER SPOTTER FROM LAKE MI NA THAT WIND OF 40 MPH WITH VERY
HEAVY RAIN.

THIS THUNDERSTORM ACTIVITY SHOULD BE IN THE ABERDEEN AREA BY 115
AM CDT PRODUCING VERY STRONG WIND AND HEAVY RAIN. BE PREPARED
TO TAKE SHELTER IF REQUIRED.
 STUDNICKA
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 8:25 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	65 min
Jul 31, 10:54 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	66 min
Aug 1, 12:26 AM CDT	Severe Thunderstorm Warning	ABR	Edmunds	64 min
Aug 1, 1:37 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Marshall	53 min

Nearby

Tornado Warnings in South Dakota, 1987 Every tornado warning in 1987 Tornadoes 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.