Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 180, NWS Sioux Falls, SD

August 17, 1986Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 17, 1986, 12:10 AM CDT for Woodbury County, Iowa. It was in force for 65 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 17, 1986, 12:10 AM CDT (05:10 UTC)
Expired
Aug 17, 1986, 1:15 AM CDT
In force
65 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Woodbury County, IA

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 17, 12:14 AM CDTThunderstorm Wind 52Woodbury, IA

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

Omaha, NE (KOAX), launched 00:00Z, 5.2 hours before the alert went out and 122 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, Omaha, NE at 00:00Z on 1986-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 00:00Z on 1986-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3605 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, 10:44 PM CDT, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
1040 PM CDT SAT AUG 16 1986

...SEVERE THUNDERSTORM WATCH FOR SOUTHEAST SOUTH DAKOTA..NORTHWEST
   IOWA..AND NORTHEAST NEBRASKA UNTIL 400 AM CDT FRIDAY MORNING...

AT 1040 PM...THERE WERE NUMEROUS INTENSE THUNDERSTORMS WITH VERY
HEAVY RAIN IN SOUTHEAST SOUTH DAKOTA AND SOUTHWEST MINNESOTA.

THE STRONGEST THUNDERSTORMS WERE IN A 25 MILE WIDE BAND FROM SIOUX
FALLS TO 30 MILES SOUTHWEST OF MITCHELL.

HAIL AND STRONG GUSTY WINDS HAD BEEN REPORTED WITH THESE STORMS.

MOVEMENT WAS EAST AT 12 MILES AN HOUR.

BE ALERT FOR SEVERE THUNDERSTORMS AND BE PREPARED TO TAKE COVER
IF THREATENING WEATHER APPROACHES..
STOREY
Special weather statement, Aug 16, 11:20 PM CDT, 50 minutes before
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Special weather statement, Aug 16, 11:29 PM CDT, 41 minutes before
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Special weather statement, Aug 16, 11:54 PM CDT, 16 minutes before
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Special weather statement, Aug 16, 11:56 PM CDT, 14 minutes before
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Local storm report, Aug 17, 12:08 AM CDT, 2 minutes before
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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, 9:16 PM CDTSevere Thunderstorm WarningFSDDavison59 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, 12:30 AM CDTSevere Thunderstorm WarningFSDMonona60 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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.