Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 19, NWS La Crosse, WI

July 20, 1997Winneshiek County, Iowa

NWS La Crosse, WI issued this tornado warning at Jul 20, 1997, 9:33 PM CDT for Winneshiek County, Iowa. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 20, 1997, 9:33 PM CDT (02:33 UTC)
Expired
Jul 20, 1997, 10:35 PM CDT
In force
62 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Winneshiek County, IA

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 216 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, Davenport, at 00:00Z on 1997-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2933 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, Davenport, at 00:00Z on 1997-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.193958Sfc1 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
2933 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1213 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-6 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.

281 
WFUS1 KLSE 210234 RRA
TORLSE
IAC191-210335-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
933 PM CDT SUN JUL 20 1997

* TORNADO WARNING FOR
    WINNESHIEK COUNTY - NORTHEASTERN IOWA

* UNTIL 1035 PM CDT
 
* SOME LOCATIONS AFFECTED
    KENDALLVILLE
    BURR OAK
    BLUFFTON

* AT 925 PM STORM SPOTTERS REPORTED A FUNNEL CLOUD 15 MILES
NORTHWEST OF DECORAH...NEAR KENDALLVILLE. THE STORM WAS MOVING
EAST AT 15 MPH.

* THE STORM WILL BE NEAR HIGHLAND BY 1015 PM.

IF YOU ARE NEAR THIS DANGEROUS STORM...TAKE COVER IMMEDIATELY IN
THE LOWEST FLOOR AND INNER MOST ROOM OF A BUILDING.

DB/MRN/TR

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 9:15 PM CDTTornado WarningARXHoward60 min

Nearby

Tornado Warnings in Iowa, 1997Every tornado warning in 1997Tornadoes in 1997

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.