Alert archive / Iowa / Tornado Warnings in 1986

Tornado Warning 30, NWS Sioux Falls, SD

September 28, 1986Sioux County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Sep 28, 1986, 5:24 PM CDT for Sioux County, Iowa. It was in force for 36 min.

The area

The counties it named.

The facts

Issued
Sep 28, 1986, 5:24 PM CDT (22:24 UTC)
Expired
Sep 28, 1986, 6:00 PM CDT
In force
36 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Sioux County, IA

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

Omaha, NE (KOAX), launched 12:00Z, 10.4 hours before the alert went out and 197 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 12:00Z on 1986-09-28Temperature 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 12:00Z on 1986-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
3615 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
184 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 KFSD 282224
TORFSD
IAC167-282300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
524 PM CDT SUN SEP 28 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 600 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHWEST IOWA...SIOUX

SOME OF THE CITIES INCLUDED IN THIS WARNING ARE SIOUX CENTER..
ROCK VALLEY..ORANGE CITY.

AT 520 PM CDT  RADAR INDICATED A POSSIBLE TORNADO 15 MILES
WEST OF SIOUX CENTER OR 3 EAST OF HARWARDEN IOWA MOVING
TO THE EAST NORTHEAST AT 30 MPH.

AT 515 PM CDT  A FUNNEL CLOUD WAS REPORTED 2 MILES EST OF
HARWARDEN IOWA.

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.

KOSCIELSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 28, 5:42 PM CDTSevere Thunderstorm WarningFSDLyon63 min
Sep 28, 6:05 PM CDTSevere Thunderstorm WarningFSDOsceola, Sioux55 min

Nearby

Tornado Warnings in Iowa, 1986Every tornado warning in 1986Tornadoes 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.