Alert archive / Iowa / Tornado Warnings in 1986

Tornado Warning 25, NWS Des Moines, IA

September 26, 1986Hamilton County, Hardin County, Iowa

NWS Des Moines, IA issued this tornado warning at Sep 26, 1986, 8:17 PM CDT for Hamilton County, Hardin County, Iowa. It was in force for 28 min.

The area

The counties it named.

The facts

Issued
Sep 26, 1986, 8:17 PM CDT (01:17 UTC)
Expired
Sep 26, 1986, 8:45 PM CDT
In force
28 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Hamilton County, IA, Hardin 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, 1.3 hours before the alert went out and 267 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 1986-09-27Temperature 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 1986-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 square meters per square second.19395878Sfc1 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
3558 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
157 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 270118
TORDSM
IAC079-083-270145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
817 PM CDT FRI SEP 26 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

CENTRAL IOWA...EASTERN HAMILTON AND HARDIN

NATIONAL WEATHER SERVICE RADAR AT DES MOINES REVEALED A POSSIBLE
TORNADO IN EASTERN HAMILTON COUNTY...IN THE VICINITY OF JEWELL
...AT 712 PM CDT.  JEWELL IS LOCATED 30 MILES SOUTHEAST OF FORT
DODGE.

AT 807 PM DIME SIZE HAIL OCCURRED AT JEWELL AND ELLSWORTH.

THIS WARNING INCLUDES THE TOWNS AND CITIES OF JEWELL...ELLSWORTH
AND RADCLIFFE.

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.

DOWD/CW/DLF

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, Sep 26, 5:45 PM CDT, 2 hours 32 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
540 PM CDT FRI SEP 26 1986

AT 530 PM
A LINE OF SCATTERED THUNDERSTORMS WAS INDICATED FROM WEST CENTRAL INTO
NORTHWEST IOWA.  THE LINE EXTENDED FROM 40 MILES NORTHEAST OF COUNCIL
BLUFFS NEAR ATLANTIC TO 25 MILES NORTHWEST OF FORT DODGE.

INTENSE THUNDERSTORMS WERE ASSOCIATED WITH THIS LINE.  THEY WERE
LOCATED 5 MILES SOUTHEAST OF CARROLL AND 25 MILES NORTHWEST OF
FORT DODGE.  BRIEF HEAVY RAINS...STRONG WINDS AND SMALL HAIL ARE
POSSIBLE FROM THESE INTENSE STORMS.

ALL OF THE THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR.

FERRY
Special weather statement, Sep 26, 6:25 PM CDT, 1 hour 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
625 PM CDT FRI SEP 26 1986

AN INTENSE THUNDERSTORM CAPABLE OF PRODUCING PEA TO MARBLE SIZE
HAIL...HEAVY RAINS AND WINDS OF 40 TO 50 MPH WAS OVER CENTRAL GREEN
COUNTY AT 620 PM.  GREEN COUNTY IS 50 MILES TO THE NORTHWEST OF DES
MOINES.

THIS STORM IS MOVING NORTHEAST AT 35 MILES AN HOUR AND WILL MOVE INTO
THE DANA AND PATON AREA IN NORTHEAST JEFFERSON COUNTY BETWEEN
630 PM AND 650 PM.

AT 620 PM PEA TO MARBLE SIZE HAIL OCCURRED AT JEFFERSON.

WEINBRECHT
Special weather statement, Sep 26, 6:43 PM CDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
643 PM CDT FRI SEP 26 1986

...A SEVERE THUNDERSTORM IS IN EFFECT FOR MUCH OF IOWA UNTIL MIDNIGHT...

NO SEVERE WEATHER HAS BEEN REPORTED BETWEEN 530 AND 630 PM.

AT 630 PM...
INTENSE THUNDERSTORMS WERE LOCATED NEAR JEFFERSON...45 MILES NORTHWEST
OF DES MOINES AND NEAR BELMOND...25 MILES SOUTHWEST OF MASON CITY.

THESE STORMS WERE CAPABLE OF PRODUCING BRIEF VERY HEAVY RAIN...PEA TO
MARBLE SIZED HAIL AND GUSTY WINDS ALONG WITH FREQUENT LIGHTNING.

THESE STORMS WERE PART OF A 30 MILE WIDE BAND OF SHOWERS AND STORMS
THAT STRETCHED FROM SOUTHWEST IOWA NEAR SHENANDOAH...NORTHEAST TO
THE MINNESOTA BORDER NEAR BUFFALO CENTER.

THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR.
<
BARLOW/FERRY

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 26, 7:06 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Hancock54 min
Sep 26, 8:02 PM CDTSevere Thunderstorm WarningDMXHamilton, Hardin28 min
Sep 26, 8:47 PM CDTTornado WarningDMXWebster, Wright23 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.