Alert archive / South Dakota / Tornado Warnings in 1986

Tornado Warning 17, NWS Aberdeen, SD

July 26, 1986Walworth County, South Dakota

NWS Aberdeen, SD issued this tornado warning at Jul 26, 1986, 7:34 PM CDT for Walworth County, South Dakota. It was in force for 26 min.

The area

The counties it named.

The facts

Issued: Jul 26, 1986, 7:34 PM CDT (00:34 UTC)
Expired: Jul 26, 1986, 8:00 PM CDT
In force: 26 min
Issued by: NWS Aberdeen, SD
Area: Whole counties

County Walworth 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, 0.6 hours before the alert went out and 141 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: 1680 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1819 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KABR 270034 RRA
TORABR
SDC129-270100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE ABERDEEN SD
734 PM CDT SAT JUL 26 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTH CENTRAL SOUTH DAKOTA...SOUTHERN WALWORTH

THIS WARNING INCLUDES THE ADJACENT WATERS OF THE MISSOURI RIVER.

SOME OF THE CITIES INCLUDED IN NORTH CENTRAL SOUTH DAKOTA ARE
LOWRY..AKASKA..AND HOVEN.

AT 725 PM CDT  RADAR INDICATED A POSSIBLE TORNADO 2 MILES SOUTH
 OF LOWRY..25 MILES SOUTHEAST OF MOBRIDGE.

AT 725 PM CDT  A FUNNEL CLOUD WAS REPORTED 2 MILES WEST AND 5 MILES
 SOUTH OF LOWRY. MOVEMENT WAS SOUTHEAST.

 THE STORM ASSOCIATED WITH THIS POSSIBLE TORNADO  WAS MOVING
 SOUTHEAST AT 10 MPH.

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.

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

Local storm report, Jul 26, 7:13 PM CDT, 21 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
710 PM CDT SAT JUL 26 1986

TIME           LOCATION AND EVENT
320 PM MDT     1 WEST OF MCLAUGHLIN..MARBLE SIZE HAIL.
348 PM MDT     MCLAUGHLIN..PEA TO MARBLE SIZE HAIL.
629 PM CDT     MOBRIDGE..50 MPH WIND.
634 PM CDT     MOBRIDGE WATER PLANT..PEA SIZE HAIL.
545 PM MDT     WHITEHORSE..CENTRAL DEWEY..PRARIE FIRE CAUSED BY
               LIGHTNING.
ALL REPORTS WERE FROM CIVIL DEFENSE DIRECTOR IN MOBRIDGE.

KEEFE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:01 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Potter	59 min
Jul 27, 1:02 PM CDT	Severe Thunderstorm Warning	ABR	Kingsbury	28 min
Jul 27, 1:05 PM CDT	Tornado Warning	ABR	Deuel	25 min
Jul 27, 1:49 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	56 min
Jul 27, 5:07 PM CDT	Severe Thunderstorm Warning	ABR	Hand, Hyde	68 min
Jul 27, 6:21 PM CDT	Severe Thunderstorm Warning	ABR	Jerauld	69 min

Nearby

Tornado Warnings in South Dakota, 1986 Every tornado warning in 1986 Tornadoes in 1986

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.