Alert archive / Iowa / Tornado Warnings in 1986

Tornado Warning 21, NWS Des Moines, IA

July 28, 1986Carroll County, Crawford County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 28, 1986, 9:34 PM CDT for Carroll County, Crawford County, Iowa. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Jul 28, 1986, 9:34 PM CDT (02:34 UTC)
Expired
Jul 28, 1986, 10:30 PM CDT
In force
56 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Carroll County, IA, Crawford 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, 2.6 hours before the alert went out and 131 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 290235
TORDSM
IAC027-047-290330-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 1030 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

WEST CENTRAL IOWA...WESTERN CARROLL AND CRAWFORD

AT 930 PM..DES MOINES RADAR INDICATED TWO POSSIBLE TORNADOES
OVER CRAWFORD COUNTY.  ONE WAS LOCATED IN NORTHEAST CRAWFORD
COUNTY..5 TO 10 MILES NORTHEAST OF DENISON..AND THE OTHER IN
EXTREME SOUTHWEST CRAWFORD COUNTY..ABOUT 10 MILES SOUTHWEST OF
DENISON.

THE STORMS WERE MOVING SOUTHEAST AT 40 MILES AN HOUR.

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 DEPR>ESSION.

BARLOW/TRUETT

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, 9:48 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
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.