Alert archive / South Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 171, NWS Sioux Falls, SD

August 16, 1986Davison County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 1986, 9:16 PM CDT for Davison County, South Dakota. It was in force for 59 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
Aug 16, 1986, 9:16 PM CDT (02:16 UTC)
Expired
Aug 16, 1986, 10:15 PM CDT
In force
59 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Davison 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

TimeReportWhereRemark
Aug 16, 9:45 PM CDTThunderstorm Wind 52Davison, 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 00:00Z, 2.3 hours before the alert went out and 138 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, Aberdeen, SD at 00:00Z on 1986-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3044 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, Aberdeen, SD at 00:00Z on 1986-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 square meters per square second.193958Sfc1 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
3044 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1221 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
507 m²/s²
Significant tornado parameter
5.1
Supercell composite
42.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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

Special weather statement, Aug 16, 5:43 PM CDT, 3 hours 33 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
540 PM CDT SAT AUG 16 1986

...THUNDERSTORM DEVELOPING RAPIDLY IN SOUTHWEST MINNESOTA...

AT 540 PM CDT A STRONG THUNDERSTORM HAS BEEN DEVELOPING RAPIDLY JUST
NORTH OF TYLER IN SOUTHWEST MINNESOTA..OR ABOUT 50 MILES NORTHEAST OF
SIOUX FALLS..SOUTH DAKOTA. THIS THUNDERSTORM WILL BE QUITE CAPABLE
OF PRODUCING VERY HEAVY RAIN..SOME HAIL..GUSTY WINDS..AND SHARP
LIGHTNING AS IT MOVES EAST AT ABOUT 20 MPH.

OTHER STRONG THUNDERSTORMS ARE LIKELY TO DEVELOP FROM EAST TO
WEST ALONG AND NEAR A SLOW MOVING FRONT EXTENDING FROM SOUTHWEST
MINNESOTA THROUGH SOUTHEAST SOUTH DAKOTA THIS EVENING. SOME OF
THESE THUNDERSTORMS COULD BE SEVERE.

RYRHOLM
Special weather statement, Aug 16, 6:51 PM CDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
645 PM CDT SAT AUG 16 1986

...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA UNTIL
1100 PM CDT...

AT 630 PM CDT...AN AREA OF INTENSE THUNDERSTORMS HAD FORMED OVER
CENTRAL AND EAST CENTRAL SOUTH DAKOTA..WEST OF A LINE FROM SIOUX FALLS
TO ABERDEEN AND EAST OF THE MISSOURI RIVER.

PERSONS IN THE WATCH AREA SHOULD BE ON THE ALERT FOR DEVELOPING SEVERE
WEATHER..AS THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL..
DAMAGING THUNDERSTORM WINDS..AND DANGEROUS LIGHTNING.

MOVEMENT OF THESE THUNDERSTORMS WAS EAST AT 15 MILES AN HOUR.
STOREY
Special weather statement, Aug 16, 7:49 PM CDT, 1 hour 27 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
745 PM CDT SAT AUG 16 1986

...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA UNTIL
1100 PM CDT...

AT 730 PM CDT...AN AREA OF INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN
CONTINUED OVER PARTS OF CENTRAL AND EAST CENTRAL SOUTH DAKOTA.

MOST OF THE THUNDERSTORMS WERE LOCATED EAST AND SOUTHEAST OF A LINE
FROM NEAR PIERRE TO COLUMBIA..15 MILES NORTH OF ABERDEEN.

PERSONS IN THE WATCH AREA SHOULD BE ON THE ALERT FOR DEVELOPING SEVERE
WEATHER..AS THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING LARGE HAIL..
DAMAGING THUNDERSTORM WINDS..AND DANGEROUS LIGHTNING.

MOVEMENT OF THESE THUNDERSTORMS WAS EAST AT 15 MILES AN_ HOUR.
MILLER/STOREY
Special weather statement, Aug 16, 8:39 PM CDT, 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
840 PM CDT SAT AUG 16 1986

...SEVERE THUNDERSTORM WATCH UNTIL 11 PM CDT FOR EAST CENTRAL AND
SOUTHEASTERN SOUTH DAKOTA...

AT 830 PM CDT RADAR INDICATED AREA OF INTENSE THUNDERSTORMS OVER
EAST CENTRAL SOUTH DAKOTA. THE AREA EXTENDED FROM ABOUT 30 MILES WEST
OF MITCHELL SOUTH DAKOTA TO NEAR BROOKINGS. MOVEMENT WAS EAST AT 10
MPH. SOME OF THESE THUNDERSTORMS WILL LIKELY CONTAIN HEAVY RAIN AND
SMALL HAIL AND STRONG GUSTY WINDS.

NO SEVERE THUNDERSTORM WARNINGS ARE IN EFFECT FOR SOUTHEASTERN SOUTH
DAKOTA. HOWEVER..PEOPLE IN SOUTHEASTERN SOUTH DAKOTA SHOULD BE ALERT
FOR THE POSSIBILITY OF SEVERE WEATHER DEVELOPING.

ANDERSON
Local storm report, Aug 16, 9:03 PM CDT, 13 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
900PAM CDT SAT AUG 16 1986

TIME             EVENT AND LOCATION

850 PM CDT       51 MPH WIND GUST AT CHAMBERLAIN SD IN BRULE COUNTY.
KAPELA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 9:10 PM CDTTornado WarningFSDAurora, Brule35 min
Aug 16, 9:16 PM CDTSevere Thunderstorm WarningFSDHanson, McCook59 min
Aug 16, 9:16 PM CDTSevere Thunderstorm WarningFSDAurora, Brule59 min
Aug 16, 10:05 PM CDTSevere Thunderstorm WarningFSDLake, Minnehaha55 min
Aug 16, 10:05 PM CDTSevere Thunderstorm WarningFSDLincoln, Turner55 min
Aug 16, 10:17 PM CDTSevere Thunderstorm WarningFSDDavison, Douglas, Hutchinson58 min
Aug 16, 10:17 PM CDTSevere Thunderstorm WarningFSDHanson58 min
Aug 16, 10:37 PM CDTSevere Thunderstorm WarningFSDClay, Lincoln, Turner68 min
Aug 16, 10:37 PM CDTSevere Thunderstorm WarningFSDYankton68 min
Aug 16, 11:06 PM CDTSevere Thunderstorm WarningFSDUnion54 min
Aug 17, 12:10 AM CDTSevere Thunderstorm WarningFSDWoodbury65 min
Aug 17, 12:30 AM CDTSevere Thunderstorm WarningFSDMonona60 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1986Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.