Alert archive / South Dakota / Tornado Warnings in 1986

Tornado Warning 14, NWS Sioux Falls, SD

July 26, 1986Lake County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 26, 1986, 12:25 AM CDT for Lake County, South Dakota. It was in force for 35 min.

The area

The counties it named.

The facts

Issued: Jul 26, 1986, 12:25 AM CDT (05:25 UTC)
Expired: Jul 26, 1986, 1:00 AM CDT
In force: 35 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Lake 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, 5.4 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: 1525 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1523 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 260525
TORFSD
SDC079-260600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1225 AM CDT SAT JUL 26 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 100 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

EAST CENTRAL SOUTH DAKOTA...WESTERN LAKE

SOME OF THE CITIES INCLUDED IN EASTERN SOUTH DAKOTA ARE RAMONA..
JUNIUS.

AT 1217 AM CDT A FUNNEL CLOUD WAS REPORTED BY THE SHERIFS OFFICE
ON KINGSBURY..MINER COUNTY LINE AT HIGHWAY 25. MOVEMENT WAS
EAST AT 15 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.

BEHREND

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 25, 7:34 PM CDT, 4 hours 51 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
635 PM CDT FRI JUL 25 1986

AT 630 PM CDT...SCATTERED THUNDERSTORMS AND THUNDERSHOWERS CONTINUED
IN NORTHEAST AND CENTRAL SOUTH DAKOTA IN A 90 MILE WIDE AREA FROM
30 MILES NORTH OF WATERTOWN TO 50 MILES NORTHWEST OF PIERRE.

THE STRONGEST THUNDERSTORM WAS 30 MILES SOUTHEAST OF PIERRE.

THESE STORMS ARE CAPABLE OF PRODUCING STRONG WINDS..HAIL..HEAVY RAIN..
AND DANGEROUS LIGHTNING SO BE ON THE LOOKOUT.
STOREY

Local storm report, Jul 25, 10:09 PM CDT, 2 hours 16 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
1005 PM CDT FRI JUL 25 1986

815 PM CDT...MARBLE SIZE HAIL AT WOLSEY..10 W HON (BEADLE COUNTY)

853 PM CDT...1 INCH HAIL AND 60 MPH WINDS AT HURON AIRPORT.

940 PM CDT...PEA TO MARBLE SIZE HAIL AND 1.65 INCHES OF RAIN AT
             BLUNT..15 ENE PIERRE (HUGHES COUNTY)

STOREY

Special weather statement, Jul 25, 10:46 PM CDT, 1 hour 39 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1045 PM CDT FRI JUL 25 1986

AT 1035 PM CDT...WIDELY SCATTERED INTENSE THUNDERSTORMS WITH
VERY HEAVY RAIN..AND SCATTERED THUNDERSTORMS WITH HEAVY RAIN..
CONTINUED IN CENTRAL AND NORTHEASTERN SOUTH DAKOTA.

THESE STORMS WERE EAST OF THE MISSOURI RIVER..AND NORTH OF
A LINE FROM BROOKINGS TO CHAMBERLAIN..60 MILES SOUTHEAST
OF PIERRE.

THE STRONGEST STORMS WERE FROM 35 MILES EAST OF PIERRE
TO 25 MILES EAST OF HURON.

THESE STORMS ARE CAPABLE OF PRODUCING HAIL..STRONG WINDS..
DANGEROUS LIGHTNING..SO BE ON THE LOOKOUT.

THESE THUNDERSTORMS HAVE PRODUCED LOCALLY HEAVY RAINFALL
FOR AN EXTENDED TIME.  SMALL STREAM..LOWLAND..AND URBAN
FLOODING ARE POSSIBLE WITH THESE STORMS.  PEOPLE IN
KINGSBURY AND MINER COUNTIES..TO THE EAST OF HURON..
AND ALSO IN HAND AND HYDE COUNTIES..TO THE WEST OF HURON..
SHOULD BE AWARE OF RAPIDLY CHANGING WEATHER CONDITIONS
AN(D BE PREPARED TO TAKE PROTECTIVE ACTIONS.

KRAUSE/MORRIS

Special weather statement, Jul 25, 11:21 PM CDT, 1 hour 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1120 PM CDT FRI JUL 25 1986

...HEAVY THUNDERSTORMS MOVING INTO EAST/CENTRAL SOUTH DAKOTA...

A LINE OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS EXTENDED FROM
ABOUT 40 MILES EAST OF PIERRE TO 30 MILES EAST OF HURON. THESE
THUNDERSTORMS HAVE BEEN MOVING EAST AT 15 TO 20 MPH. THEY SHOULD BE
MOVING AND DEVELOPING INTO PARTS OF BROOKINGS..LAKE..AND MOODY
COUNTIES IN SOUTHEAST SOUTH DAKOTA BY 1 AM CDT..AND POSSIBLY INTO
LINCOLN COUNTY IN SOUTHWEST MINNESOTA BY 2 AM CDT.

THESE STORMS HAVE PRODUCED VERY HEAVY RAINS OF 1 TO 2 INCHES WITHIN
A COUPLE OF HOURS WHICH MAY CAUSE LOCAL FLOODING. THESE STORMS MAY
ALSO PRODUCE DANGEYROUS LIGHTNING AND BRIEF PERIODS OF STRONG WINDS
AND SOME HAIL.

RYRHOLM

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.