Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 13, NWS La Crosse, WI

June 18, 1998Howard County, Iowa

NWS La Crosse, WI issued this tornado warning at Jun 18, 1998, 4:22 PM CDT for Howard County, Iowa. It was in force for 33 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
Jun 18, 1998, 4:22 PM CDT (21:22 UTC)
Expired
Jun 18, 1998, 4:55 PM CDT
In force
33 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Howard County, IA

What was reported inside it

TimeReportWhereRemark
Jun 18, 4:25 PM CDTThunderstorm Wind 53Cresco, 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 195 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, Minneapolis, MN at 12:00Z on 1998-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 430 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, Minneapolis, MN at 12:00Z on 1998-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
430 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
666 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
-35 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 KLSE 182124 RRA
TORLSE
IAC089-182155-

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN HOWARD COUNTY IN NORTHEASTERN IOWA

* UNTIL 455 PM CDT

* AT 420 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR BONAIR OR 22 MILES NORTHWEST OF DECROAH... MOVING
  NORTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  FLORENCEVILLE AT 430 PM

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

KING/RRS

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, 3:20 PM CDTTornado WarningARXChickasaw50 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, 4:25 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.