Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 113, NWS Des Moines, IA

July 29, 1986Decatur County, Wayne County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 29, 1986, 12:50 AM CDT for Decatur County, Wayne County, Iowa. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 29, 1986, 12:50 AM CDT (05:50 UTC)
Expired
Jul 29, 1986, 1:45 AM CDT
In force
55 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Decatur County, IA, Wayne 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, 5.8 hours before the alert went out and 245 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 1986-07-29The 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 290551
SVRDSM
IAC185-053-290645-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1250 AM CDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF

SOUTH CENTRAL IOWA...WAYNE AND NORTHEAST DECATUR

AT 1249 AM..A SEVERE THUNDERSTORM WAS INDICATED ON RADAR
10 TO 15 MILES NORTH OF LAMONI..ALONG THE DECATUR..CLARKE COUNTY
LINE..OR ABOUT 40 MILES SOUTH OF DES MOINES.

THE STORM WAS MOVING SOUTHEAST AT 40 MILES AN HOUR..AND WILL
MOVE THROUGH THE CITIES OF VAN WERT..GARDEN GROVE..LEROY..
LEON..HUMMESTON..AND CORYDON.
<
REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYING AREAS.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE
OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE
TO A PLACE OF SAFETY IF ONE IS SPOTTED.

IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY.  IF SEVERE WEATHER CONDITIONS ARE OBSERVED..PLEASE ASK
THE NEAREST LAW ENFORCEMENT AGENCY TO -RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

FERRY/TRUETT

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, Jul 28, 8:53 PM CDT, 3 hours 57 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, 2 hours 45 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
Special weather statement, Jul 29, 12:46 AM CDT, 4 minutes before
<PQ<
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1215 PM CDT MON JUL 28 1986

..TORNADO WATCH NUMBER 423 HAS BEEN CANCELLED FOR A LARGE PART
FO WEST CENTRAL AND CENTRAL IOWA.

...TORNADO WATCH NUMBER 423 REMAINS IN EFFECT UNTIL 2 AM FOR
SOUTHWEST AND SOUTH CENTRAL IOWA...
..TORNADO WATCH NUMBER 425 REMAINS IN EFFECT UNTIL 4 AM FOR
A LARGE PART SOUTHEAST IOWA AND PORTIONS OF EAST CENTRAL IOWA..

THE TORNADO WATCH NUMBER 423 HAS BEEN CANCELLED FOR WEST CENTRAL
AND CENTRAL IOWA..AS THESE STORMS HAVE ALREADY PASSED THROUGH
THE AREA.  NUMEROUS INSTANCES OF WIND DAMAGE..AND A FEW REPORTS
OF TORNADOES..OCCURRED IN THOSE COUNTIES EARLIER THIS EVENING.
FOR THOSE FAMILIAR WITH ZONE ALIGNMENTS..THE WATCH HAS BEEN
CANCELLED FOR ZONES 6..9 AND 10.

REMEMBER..A TORNADO WATCH REMAINS IN EFFECT FOR SOUTHWEST
AND SOUTH CENTRAL IOWA UNTIL 2 AM..AND IN A PORTION OF EAST
CENTRAL AS WELL AS SOUTHEAST IOWA UNTIL 4 AM.&   THIS INCLUDES
ZONES 12..13 14 AND 15 AS WELL AS PART OF ZONE 11.

DOWD
Local storm report, Jul 29, 12:47 AM CDT, 3 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1250 AM CDT TUE JUL 29 1986

TIME         EVENT

735 PM       EXTENSIVE DAMAGE TO BAILEY FARM 2S OF ROYAL IN CLAY COUNTY.

750 PM       50 TO 55 MPH WINDS..1/8TH MILE VSBY.

803 PM       BASEBALL-SIZED HAIL 1S OF SIOUX RAPIDS IN BUENA VISTA COUNTY.

800-830 PM   ANOTHER FARM DESTROYED NEAR ROYAL, 2S AND 1 1/2W.

ABT 820 PM   BRIEF TORNADO TOUCHDOWN NEAR WHITING IN MONONA COUNTY.

ABT 825 PM   PSBL TORNADO NEAR POCHAHONTAS.

830-930 PM   WIND DAMAGE NEAR FORT DODGE.
/
1012 PM      50-55 MPH WINDS JUNCTION I-35 AND ROUTE 141.

1014 PM      40-50 MPH WINDS AT WAUKEE.

1016 PM      WINDOW DAMAGE BETWEEN POLK CITY AND MADRID.

1018 PM      PUBLIC RPT FUNNEL NEAR 22ND AND FOREST IN DES MOINES.

1020 PM      TREES DOWNED IN WINDSOR HEIGHTS..SUBURB OF DES MOINES.

1024 PM      TORNADO NEAR BERWICK..SUBURB OF DES MOINES.

1025 PM      62 MPH WIND..TREE DAMAGE AT FAIRGROUND IN DES MOINES.

1028 PM      TRAILERS DAMAGED AT NEVADA IN STORY COUNTY.

1032 PM      60 MPH WINDS AT CARLISLE..WARREN COUNTY.

1048 PM      70 MPH WINDS AT MITCHELLVILLE..POLK COUNTY.

1058 PM      60 MPH WINDS NEAR ANKENY AND IN NORTHEAST DES MOINES.

ABT 1130 PM  NO POWER IN  MONTEZUMA..POWESHIEK COUNTY.  PHONE LINES DOWN
             TO KNOXVILLE IN MARION COUNTY.

1131 PM      UNION COUNTY SHERIFF REPORTED POSSIBLE TORNADO 10 NW OF
             CRESTON.

1136 PM      GOLFBALL-SIZED HAIL BETWEEN FONTANELLE AND GREENFIELD IN
             ADAIR COUNTY.

1138 PM      60 MPH WINDS IN BROOKLYN..POWESHIEK COUNTY.

1140 PM      POWER LINES DOWNED IN MONROE COUNTY.

1148 PM      60-70 MPH WINDS IN EDDYVILLE..WAPELLO COUNTY.(

MYERS

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, 11:38 PM CDTTornado WarningDMXAdair, Union97 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

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; the sounding from the Mesonet's radiosonde archive.