Alert archive / South Dakota / Tornado Warnings in 1987

Tornado Warning 1, NWS Aberdeen, SD

May 26, 1987Dewey County, South Dakota

NWS Aberdeen, SD issued this tornado warning at May 26, 1987, 8:00 PM MDT for Dewey County, South Dakota. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
May 26, 1987, 8:00 PM MDT (02:00 UTC)
Expired
May 26, 1987, 8:30 PM MDT
In force
30 min
Issued by
NWS Aberdeen, SD
Area
Whole counties

County Dewey 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.0 hours before the alert went out and 180 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-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 1987-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 1987-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
7 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
840 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
114 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 KABR 270200
TORABR
SDC041-270230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
800 PM MDT TUE MAY 26 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 830 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTH CENTRAL SOUTH DAKOTA...DEWEY

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE TIMBER LAKE...TRAIL
CITY...EAGLE BUTTE...RIDGEVIEW...PARADE.

AT 755 PM MDT  RADAR INDICATED A POSSIBLE TORNADO NEAR EAGLE BUTTE
...50 MILES SOUTH WEST OF MOBRIDGE...MOVING NORTH AT 25 MPH.

 AT 750 PM MDT AN UNCONFIRMED REPORT OF A FUNNEL WAS RECIEVED FROM
EAGLE BUTTE...50 MILES SOUTH WEST OF MOBRIDGE.

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 SHOUL5D BE ABANDONED FOR
A REINFORCED BUILDING.

KEEFE

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, May 26, 6:14 PM MDT, 1 hour 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
715 PM CDT TUE MAY 26 1987

...TORNADO WATCH IN EFFECT UNTIL MIDNIGHT CDT...

AT 710 PM CDT RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY RAIN IN
STANLEY COUNTY AND SOUTHERN DEWEY COUNTY OF CENTRAL SOUTH DAKOTA
DAKOTA. THESE STORMS WERE MOVING NORTH AT 25 MPH.

AT 635 PM CDT THESE THUNDERSTORMS PRODUCED 2 FUNNEL CLOUDS IN STANLEY
COUNTY.

THESE STORMS CAN BE EXPECTED TO PRODUCE SMALL HAIL...STRONG WINDS AND
DANGEROUS LIGHTNING. IF YOU LIVE IN DEWEY COUNTY...OR IF YOU ARE
CAMPING OR BOATING ALONG THE MISSOURI RIVER YOU SHOULD BE ESPECIALLY
ALERT TO THE WEATHER CONDITIONS APPROACHING YOU UNTIL ABOUT 800 PM CDT
WHEN THESE STORMS SHOULD DISSIPATE.

KEEFE
Special weather statement, May 26, 6:54 PM MDT, 1 hour 6 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
755 PM CDT TUE MAY 26 1987

...TORNADO WATCH IN EFFECT UNTIL MIDNIGHT CDT...

AT 750 PM CDT RADAR SHOWED THUNDERSTORMS...SOME INTENSE WITH VERY
HEAVY RAIN IN DEWEY COUNTY OF CENTRAL SOUTH DAKOTA. THESE STORMS
WERE MOVING NORTH AT ABOUT 25 MPH...AND WERE MOVING INTO WESTERN
WALWORTH COUNTY AND SOUTHERN CORSON COUNTY.

THESE STORMS CAN BE EXPECTED TO PRODUCE SMALL HAIL...STRONG WINDS AND
DANGEROUS LIGHTNING. IF YOU LIVE IN DEWEY...CORSON...OR WALWORTH
COUNTIES OR IF YOU ARE CAMPING OR BOATING ALONG THE MISSOURI RIVER
YOU SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND BE
PREPARED TO SEEK SHELTER UNTIL AROUND 900 PM CDT WHEN THESE STORMS
SHOULD MOVE OUT OF THE AREA.

KEEFE

Nearby

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