Alert archive / Iowa / Tornado Warnings in 2002

Tornado Warning 10, NWS La Crosse, WI

June 21, 2002Floyd County, Iowa

NWS La Crosse, WI issued this tornado warning at Jun 21, 2002, 1:24 PM CDT for Floyd 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 21, 2002, 1:24 PM CDT (18:24 UTC)
Expired
Jun 21, 2002, 2:00 PM CDT
In force
36 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Floyd County, IA

The radar

The La Crosse radar (KARX), 154 km from the middle of the area, began a volume at 18:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.4 hours before the alert went out and 209 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 2002-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2002-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
450 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.4

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KARX 211824
TORLSE
IAC067-211900-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
124 PM CDT FRI JUN 21 2002

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  FLOYD COUNTY IN NORTH CENTRAL IOWA

* UNTIL 200 PM CDT

* AT 124 PM CDT...LAW ENFORCEMENT OFFICIALS REPORTED A TORNADO 4
  MILES SOUTH OF MARBLE ROCK...OR ABOUT 15 MILES SOUTHWEST OF CHARLES
  CITY...MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE...
  OVER RURAL SOUTHERN FLOYD COUNTY AT 140 PM CDT
  POWERSVILLE

TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR

04

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 1:16 PM CDTSevere Thunderstorm WarningARXFloyd44 min
Jun 21, 3:05 PM CDTTornado WarningARXClayton40 min
Jun 21, 6:06 PM CDTSevere Thunderstorm WarningARXChickasaw84 min
Jun 21, 6:16 PM CDTTornado WarningARXChickasaw74 min

Nearby

Tornado Warnings in Iowa, 2002Every tornado warning in 2002Tornadoes in 2002

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; radar from the NEXRAD Level II archive.