Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 23, NWS La Crosse, WI

June 24, 1998Clayton County, Iowa

NWS La Crosse, WI issued this tornado warning at Jun 24, 1998, 2:34 AM CDT for Clayton County, Iowa. It was in force for 36 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
Jun 24, 1998, 2:34 AM CDT (07:34 UTC)
Expired
Jun 24, 1998, 3:10 AM CDT
In force
36 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Clayton County, IA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 24, 12:00 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.6 hours before the alert went out and 153 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 1998-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 794 joules per kilogram.LCLLFCEL10008507005003002001001 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 1998-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
794 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

825 
WFUS1 KLSE 240735 RRA
TORLSE
IAC043-240810-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
234 AM CDT WED JUN 24 1998

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN CLAYTON COUNTY IN NORTHEASTERN IOWA

* UNTIL 310 AM CDT

* AT 230 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO JUST SOUTH ELKPORT OR 30 MILES NORTHWEST OF DUBUQUE...
  MOVING EAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  MILLVILLE AROUND 255 AM CDT

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

TMC/NELSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 11:55 PM CDTSevere Thunderstorm WarningARXFloyd60 min
Jun 24, 12:05 AM CDTSevere Thunderstorm WarningARXMitchell50 min
Jun 24, 12:15 AM CDTSevere Thunderstorm WarningARXChickasaw, Howard50 min
Jun 24, 12:55 AM CDTSevere Thunderstorm WarningARXFayette, Winneshiek45 min

Nearby

Tornado Warnings in Iowa, 1998Every tornado warning in 1998Tornadoes in 1998

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.