Alert archive / Iowa / Tornado Warnings in 1992

Tornado Warning 27, NWS Sioux Falls, SD

July 11, 1992Monona County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jul 11, 1992, 8:23 PM CDT for Monona County, Iowa. It was in force for 37 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 11, 1992, 8:23 PM CDT (01:23 UTC)
Expired
Jul 11, 1992, 9:00 PM CDT
In force
37 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Monona County, IA

What was reported inside it

TimeReportWhereRemark
Jul 11, 8:45 PM CDTHail 1.75Monona, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOVN), launched 00:00Z, 1.4 hours before the alert went out and 88 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 1992-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1377 joules per kilogram.LCLEL10008507005003002001001 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 1992-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 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
1377 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSUX 120126 RRA
TORSUX
IAC133-120200-

BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING...CORRECTED FOR LOCATION OF TORNADO
NATIONAL WEATHER SERVICE SIOUX CITY IA
823 PM CDT SAT JUL 11 1992

THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  900 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN WEST CENTRAL IOWA

   ...SOUTHWESTERN MONONA COUNTY

AT 805 PM CDT THE MONONA COUNTY SHERIFF DEPARTMENT REPORTED A POSSIBLE
TORNADO 5 MILES SOUTHWEST OF ONAWA...35 MILES SOUTHEAST OF SIOUX
CITY. THIS TORNADO WAS MOVING TO THE SOUTHEAST AT 10 MILES AN HOUR.
PEOPLE IN ONAWA AND BLENCOE SHOULD TAKE COVER IMMEDIATELY.

THIS IS A DANGEROUS STORM. TAKE COVER IMMEDIATELY. IF YOU ARE IN A
STRONG BUILDING GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR. AVOID
WINDOWS. ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING OR
GET INTO A DITCH OR DEPRESSION...COVER YOUR HEAD WITH YOUR HANDS.

ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORTS OF
SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

IRELAND

Nearby

Tornado Warnings in Iowa, 1992Every tornado warning in 1992Tornadoes in 1992

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.