Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 10, NWS La Crosse, WI

June 18, 1998Chickasaw County, Iowa

NWS La Crosse, WI issued this tornado warning at Jun 18, 1998, 3:20 PM CDT for Chickasaw County, Iowa. It was in force for 50 min. 3 reports 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
Jun 18, 1998, 3:20 PM CDT (20:20 UTC)
Expired
Jun 18, 1998, 4:10 PM CDT
In force
50 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Chickasaw County, IA

What was reported inside it

TimeReportWhereRemark
Jun 18, 3:20 PM CDTThunderstorm Wind 96Nashua, IA
Jun 18, 3:33 PM CDTThunderstorm Wind 95North Washington, IA
Jun 18, 3:45 PM CDTThunderstorm WindAlta Vista, 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 18, 2:10 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.3 hours before the alert went out and 219 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 12:00Z on 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2000 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 12:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 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
2000 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
1205 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
81 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.

842 
WFUS1 KLSE 182022 RRA
TORLSE
IAC037-182110-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
320 PM CDT THU JUN 18 1998

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  CHICKASAW COUNTY IN NORTHEASTERN IOWA

* UNTIL 410 PM CDT

* AT 318 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR NASHUA OR 35 MILES SOUTHEAST OF MASON CITY... MOVING
  NORTHEAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  IONIA AT 325 PM
  NEW HAMPTON AT 335 PM

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

KING

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 10:48 AM CDTSevere Thunderstorm WarningARXClayton42 min
Jun 18, 3:38 PM CDTTornado WarningARXHoward47 min
Jun 18, 4:02 PM CDTSevere Thunderstorm WarningARXFayette, Winneshiek58 min
Jun 18, 4:18 PM CDTTornado WarningARXWinneshiek42 min
Jun 18, 4:22 PM CDTTornado WarningARXHoward33 min
Jun 18, 4:25 PM CDTTornado WarningARXClayton65 min
Jun 18, 4:30 PM CDTFlash Flood WarningARXChickasaw, Howard4 hr
Jun 18, 4:37 PM CDTSevere Thunderstorm WarningARXAllamakee63 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.