Alert archive / Iowa / Tornado Warnings in 1986

Tornado Warning 23, NWS Des Moines, IA

July 28, 1986Adair County, Union County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 28, 1986, 11:38 PM CDT for Adair County, Union County, Iowa. It was in force for 97 min.

The area

The counties it named.

The facts

Issued
Jul 28, 1986, 11:38 PM CDT (04:38 UTC)
Expired
Jul 29, 1986, 1:15 AM CDT
In force
97 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Adair County, IA, Union 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 00:00Z, 4.6 hours before the alert went out and 169 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 1986-07-29Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 1986-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.1939587897Sfc1 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
3613 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
119 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 KDSM 290439 RRA
TORDSM
IAC001-175-290515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1138 PM CDT MON JUL 28 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 1215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

SOUTHWEST IOWA...SOUTHERN ADAIR  AND NORTHERN UNION

AT 1137 PM...DES MOINES RADAR INDICATED A TORNADO IN
SOUTHERN ADAIR COUNTY..ABOUT 40 TO 50 MILES SOUTHWEST OF
DES MOINES..OR JUST SOUTH OF GREENFIELD.

THIS STORM WAS MOVING EAST SOUTHEAST AT 30 TO 40 MILES AN HOUR.
AND WILL AFFECT THE CITIES OF CRESTON AND ORIENT.}
IF A TORNADO APPROACHES..TAKE COVER IMMEDIATELY.  A BASEMENT..
INTERIOR HALLWAY..OR A ROOM ON THE LOWEST FLOOR IS THE SAFEST PLACE
IN MOST BUILDINGS.  IF YOU ARE IN A MOBILE HOME OR AN AUTOMOBILE..
LEAVE AT ONCE.  TAKE COVER IN A STORM SHELTER..OR LIE IN A NEARBY
DITCH OR DEPRESSION.

BARLOW/TRUETT

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 28, 8:53 PM CDT, 2 hours 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WATERLOO IA
845 PM CDT MON JUL 28 1986

A NARROW BAND OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED IN
NORTHCENTRAL IOWA.  THESE SHOWERS AND THUNDERSTORMS WERE THE RESULT
OF OUT RUSHING WINDS FROM THE STRONG THUNDERSTORM SOUTH OF SPENCER.

THE BAND OF RAIN EXTENDED FROM 30 MILES WEST OF MASON CITY..NEAR
ALGONA..TO 40 MILES SOUTHWEST OF WATERLOO..NEAR ELDORA.  THESE
THUNDERSTRORMS WERE MOVING EAST AT 20 MILES AN HOUR.

AT THE PRESENT TIME RAIN AND LIGHTNING COULD  OCCUR AS THESE SHOWERS
AND THUNDERSTORMS MOVE INTO HANCOCK..FRANKLIN AND GRUNDY COUNTIES.
HAMILTON
Special weather statement, Jul 28, 10:05 PM CDT, 1 hour 33 minutes before
<PQ<
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1005 PM CDT MON JUL 28 1986

..TORNADO WATCH NUMBER 422 HAS BEEN CANCELLED FOR A LARGE PORTION
OF NORTHWEST IOWA..

...TORNADO WATCH NUMBER 423 REMAINS IN EFFECT UNTIL 2 AM FOR WEST
CENTRAL..CENTRAL..SOUTHWEST AND AND SOUTH CENTRAL IOWA...

WATCH NUMBER 422 HAS BEEN CANCELLED FOR MOST OF NORTHWEST IOWA
AS THE THUNDERSTORMS HAVE ALREADY PASSED THROUGH THE AREA.
THE LINE OF THUNDERSTORMS HAVE CONTINUED TO WREAK HAVOC AS
IT HAS MOVED INTO WEST CENTRAL AND CENTRAL IOWA.  FOR THOSE
FAMILIAR WITH THE ZONE ALIGNMENT..ZONES 1..4 AND 5 HAVE BEEN
CLEARED OF THE TORNADO WATCH.

REMEMBER..A TORNADO WATCH REMAINS IN E\FFECT UNTIL 2 AM FOR
MUCH OF WEST CENTRAL..CENTRAL..SOUTH CENTRAL AND SOUTHWEST IOWA.

DOWD

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 7:07 PM CDTSevere Thunderstorm WarningDMXClay63 min
Jul 28, 7:48 PM CDTTornado WarningDMXClay32 min
Jul 28, 7:57 PM CDTTornado WarningDMXBuena Vista, Pocahontas58 min
Jul 28, 8:07 PM CDTTornado WarningDMXBuena Vista48 min
Jul 28, 8:51 PM CDTSevere Thunderstorm WarningDMXCalhoun, Pocahontas, Webster64 min
Jul 28, 9:10 PM CDTTornado WarningDMXCrawford20 min
Jul 28, 9:22 PM CDTSevere Thunderstorm WarningDMXCarroll, Greene58 min
Jul 28, 9:34 PM CDTTornado WarningDMXCarroll, Crawford56 min
Jul 28, 9:48 PM CDTSevere Thunderstorm WarningDMXGuthrie42 min
Jul 28, 9:48 PM CDTSevere Thunderstorm WarningDMXBoone, Dallas, Hamilton42 min
Jul 28, 10:14 PM CDTSevere Thunderstorm WarningDMXPolk, Story46 min
Jul 28, 10:14 PM CDTSevere Thunderstorm WarningDMXMadison46 min
Jul 28, 10:27 PM CDTTornado WarningDMXJasper, Polk53 min
Jul 28, 10:31 PM CDTSevere Thunderstorm WarningDMXWarren49 min
Jul 28, 10:31 PM CDTSevere Thunderstorm WarningDMXMarshall49 min
Jul 28, 10:46 PM CDTSevere Thunderstorm WarningDMXMarion54 min
Jul 28, 10:54 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas46 min
Jul 28, 11:16 PM CDTSevere Thunderstorm WarningDMXMahaska, Monroe44 min
Jul 28, 11:16 PM CDTSevere Thunderstorm WarningDMXPoweshiek44 min
Jul 28, 11:22 PM CDTSevere Thunderstorm WarningDMXAdair98 min
Jul 28, 11:47 PM CDTSevere Thunderstorm WarningDMXKeokuk, Wapello43 min
Jul 28, 11:47 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis43 min
Jul 29, 12:10 AM CDTSevere Thunderstorm WarningDMXJefferson, Van Buren50 min
Jul 29, 12:50 AM CDTSevere Thunderstorm WarningDMXDecatur, Wayne55 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.