Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 7, NWS La Crosse, WI

May 28, 1998Allamakee County, Winneshiek County, Iowa

NWS La Crosse, WI issued this tornado warning at May 28, 1998, 5:50 PM CDT for Allamakee County, Winneshiek County, Iowa. It was in force for 60 min. 5 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
May 28, 1998, 5:50 PM CDT (22:50 UTC)
Expired
May 28, 1998, 6:50 PM CDT
In force
60 min
Issued by
NWS La Crosse, WI
Area
Whole counties

Counties Allamakee County, IA, Winneshiek County, IA

What was reported inside it

TimeReportWhereRemark
May 28, 5:50 PM CDTHail 1Decorah, IA
May 28, 6:00 PM CDTHail 1Decorah, IA
May 28, 6:15 PM CDTThunderstorm Wind 54Decorah, IA
May 28, 6:15 PM CDTHail 1.75Decorah, IA
May 28, 6:30 PM CDTHail 0.75Waukon, 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
May 28, 3:00 PM CDTSevere Thunderstorm WatchSPC5 hr
May 28, 4:00 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 207 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 1998-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 530 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 1998-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 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
530 J/kg
Mixed-layer CIN
-213 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLSE 282250 RRA
TORLSE
IAC005-191-282350-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
550 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN WINNESHIEK COUNTY IN NORTHEASTERN IOWA
  ALLAMAKEE COUNTY IN NORTHEASTERN IOWA

* UNTIL 650 PM CDT

* AT 550 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR DECORAH... MOVING NORTHEAST AT 25 xMPH.

* THE TORNADO WILL BE NEAR...
  NEW HANOVER AT 610 PM

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

SWC

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 4:32 PM CDTSevere Thunderstorm WarningARXChickasaw, Floyd58 min
May 28, 4:53 PM CDTSevere Thunderstorm WarningARXWinneshiek62 min
May 28, 5:44 PM CDTSevere Thunderstorm WarningARXAllamakee, Winneshiek61 min
May 28, 5:58 PM CDTSevere Thunderstorm WarningARXFayette62 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.