Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 49, NWS Aberdeen, SD

July 10, 1987Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 10, 1987, 11:30 PM CDT for Roberts County, South Dakota. It was in force for 35 min.

The area

The counties it named.

The facts

Issued: Jul 10, 1987, 11:30 PM CDT (04:30 UTC)
Expired: Jul 11, 1987, 12:05 AM CDT
In force: 35 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Roberts 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, 4.5 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: 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 KABR 110430
SVRABR
SDC109-110530-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
1130 PM CDT FRI JUL 10 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1230 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTHEAST SOUTH DAKOTA...ROBERTS

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE SISSETON...NEW
EFFINGTON...PEEVER.

AT 1130 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM NEAR SISSETON
IN CENTRAL ROBERTS COUNTY...70 MILES NORTHEAST OF ABERDEEN. THIS
STORM HAS SHOWN LITTLE MOVEMENT IN THE LAST HOUR.

 AT 1115 PM CDT THE ROBERTS COUNTY SHERRIFF RECIEVED A PUBLIC
REPORT OF A FUNNEL CLOUD 5 MILES SOUTHEAST OF SISSETON.

WITH THE SLOW MOVEMENT OF THIS STORM RESIDENTS OF ROBERTS COUNTY
SHOULD BE ALERT TO SMALL STREAM AND ROAD FLOODING ASSOCIATED WITH
VERY HEAVY RAIN FALLS.

IF YOU ARE IN THE PATH OF THIS STORM..YOU SHOULD GET TO A REINFORCED
SHELTER. A SEVERE THUNDERSTORM PRODUCES DAMAGING 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.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING SO BE ON THE LOOKOUT.

KEEFE

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 10, 5:31 PM CDT, 5 hours 59 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
530 PM CDT FRI JUL 10 1987

TIME           EVENT AND PLACE
447 PM CDT     LEOLA PEA TO MARBLE SIZE HAIL REPORTED BY POLICE.
               MCPHERSON COUNTY.

454 PM CDT     SELBY PEA TO MARBLE SIZE HAIL REPORTED BY POLICE.
               WALWORTH COUNTY.
GILLESPIE

Special weather statement, Jul 10, 9:52 PM CDT, 1 hour 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
950 PM CDT FRI JUL 10 1987

...INTENSE THUNDERSTORMS MOVING THROUGH MARSHALL AND ROBERTS COUNTIES...

AT 945 PM CDT RADAR INDICATED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
WERE MOVING THROUGH EASTERN MARSHALL AND ROBERTS COUNTIES OF NORTHEAST
SOUTH DAKOTA. THE STRONGEST STORMS WERE NEAR VEBLEN...70 MILES NORTHEAST
OF ABERDEEN...AND NEAR HAMMER...80 MILES NORTHEAST OF ABERDEEN.

THERE HAVE BEEN NO REPORTS OF SEVERE WEATHER WITH THESE STORMS...HOWEVER
IF YOU LIVE IN THE NORTHEAST SOUTH DAKOTA COUNTIES OF MARSHALL OR
ROBERTS YOU SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND
BE PREPARED TO SEEK SHELTER UNTIL AdBOUT 1100 PM CDT WHEN THESE STORMS
SHOULD MOVE OUT OF SOUTH DAKOTA.

KEEFE

Special weather statement, Jul 10, 10:48 PM CDT, 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
1045 PM CDT FRI JUL 10 1987

...INTENSE THUNDERSTORM MOVING ACROSS SPINK COUNTY...

AT 1040 PM CDT RADAR INDICATED AN INTENSE THUNDERSTORM WITH VERY HEAVY
RAIN MOVING ACROSS SOUTHERN SPINK COUNTY NEAR REDFIELD...40 MILES
SOUTH OF ABERDEEN. THIS STORM WAS MOVING EAST AT 25 MPH.

IF YOU LIVE IN SOUTHERN SPINK COUNTY EXPECT SMALL HAIL...STRONG WIND...
DANGEROUS LIGHTNING...AND VERY HEAVY RAIN AS THIS STORM MOVES THROUGH
YOUR COUNTY.

YOU SHOULD REMAIN ALERT TO THE WEATHER CONDITIONS UNTIL ABOUT 1130 PM
CDT WHEN THIS STORM SHOULD LEAVE SPINK COUNTY.

KEEFE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 7:16 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Potter	59 min
Jul 10, 8:02 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	58 min
Jul 10, 8:36 PM CDT	Severe Thunderstorm Warning	ABR	Brown	54 min
Jul 10, 10:22 PM CDT	Severe Thunderstorm Warning	ABR	Marshall, Roberts	68 min
Jul 11, 2:13 AM CDT	Severe Thunderstorm Warning	ABR	Hamlin, Kingsbury	62 min
Jul 11, 2:19 AM CDT	Severe Thunderstorm Warning	ABR	Deuel, Hamlin	56 min
Jul 11, 2:38 AM CDT	Severe Thunderstorm Warning	ABR	Codington, Deuel, Hamlin	67 min
Jul 11, 2:38 AM CDT	Severe Thunderstorm Warning	ABR	Kingsbury	67 min
Jul 11, 5:07 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	68 min
Jul 11, 5:25 PM CDT	Tornado Warning	ABR	Hughes, Stanley, Sully	35 min
Jul 11, 6:26 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Hyde	64 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.