Alert archive / South Dakota / Tornado Warnings in 1987

Tornado Warning 9, NWS Aberdeen, SD

July 9, 1987Hyde County, Sully County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 9, 1987, 6:05 PM CDT for Hyde County, Sully County, South Dakota. It was in force for 40 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 9, 1987, 6:05 PM CDT (23:05 UTC)
Expired: Jul 9, 1987, 6:45 PM CDT
In force: 40 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

Counties Hyde County, SD, Sully 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 9, 6:28 PM CDT	Thunderstorm Wind 54	Sully, 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 12:00Z, 11.1 hours before the alert went out and 115 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 854 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 101 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 KHON 092305
TORHON
SDC069-119-092345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE HURON SD
605 PM CDT THU JUL 9 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 645 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

CENTRAL SOUTH DAKOTA...NORTHWEST HYDE AND EASTERN SULLY

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE STONE LAKE
AGAR

AT 500 PM CDT  RADAR INDICATED A POSSIBLE TORNADO 5 MILES EAST
OF ONIDA...OR 25 MILES NORTHEAST OF PIERRE MOVING EAST AT
30 MILES AN HOUR.

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 FOR
A REINFORCED BUILDING.

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

Local storm report, Jul 9, 4:53 PM CDT, 1 hour 12 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
450 PM CDT THU JUL 9 1987

TIME:         EVENT AND AREA:
230 PM MDT    VERY HEAVY RAIN AND MARBLE SIZE HAIL AT GLEN CROSS
              IN DEWEY COUNTY.
430 PM CDT    FUNNEL CLOUD OVER MOBRIDGE SOUTH DAKOTA IN WALWORTH
              COUNTY AS REPORTED BY CIVIL DEFENSE.
415 PM CDT    GOLFBALL HAIL ALONG WITH 50 KNOT WIND AT THE WATER
              PLANT (WEATHER OBSERVER) AT MOBRIDGE.
435 PM CDT    TORNADO 5 MILES SOUTH OF MOBRIDGE REPORTED BY STATE
              POLICE.
 STUDNICKA

Local storm report, Jul 9, 6:05 PM CDT, 0 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
600 PM CDT THU JUL 9 1987

TIME:         EVENT AND PLACE:
515 PM CDT    16 MILES SOUTHWEST OF GETTYSBURY IN POTTER COUNTY.
              .98 INCH OF RAIN IN 20 MINUTES WITH PEA SIZE HAIL
              COVERING THE GROUND.
537 PM CDT    HOVEN S.D. IN POTTER COUNTY. VERY HEAVY RAIN.
540 PM CDT    16 MILES SOUTH OF LONG LAKE IN MCPHERSON COUNTY THE
              PUBLIC REPORTED A FUNNEL CLOUD TO THE ABERDEEN P.D.
 STUDNICKA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:12 PM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	63 min
Jul 9, 3:21 PM CDT	Severe Thunderstorm Warning	ABR	Corson, Dewey	69 min
Jul 9, 4:01 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Walworth	59 min
Jul 9, 4:30 PM CDT	Severe Thunderstorm Warning	ABR	Stanley	60 min
Jul 9, 4:33 PM CDT	Severe Thunderstorm Warning	ABR	Potter	57 min
Jul 9, 4:59 PM CDT	Severe Thunderstorm Warning	ABR	Hughes, Stanley	61 min
Jul 9, 5:05 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Potter, Walworth	55 min
Jul 9, 5:26 PM CDT	Severe Thunderstorm Warning	ABR	Sully	64 min
Jul 9, 5:52 PM CDT	Severe Thunderstorm Warning	ABR	McPherson	68 min
Jul 9, 6:12 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Walworth	63 min
Jul 9, 6:36 PM CDT	Severe Thunderstorm Warning	ABR	Lyman	69 min
Jul 9, 6:55 PM CDT	Severe Thunderstorm Warning	ABR	Hand, Hyde	65 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.