Alert archive / Iowa / Tornado Warnings in 2000

Tornado Warning 1, NWS La Crosse, WI

May 11, 2000Clayton County, Iowa

NWS La Crosse, WI issued this tornado warning at May 11, 2000, 8:25 PM CDT for Clayton County, Iowa. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
May 11, 2000, 8:25 PM CDT (01:25 UTC)
Expired
May 11, 2000, 9:00 PM CDT
In force
35 min
Issued by
NWS La Crosse, WI
Area
Whole counties; the outline is the Mesonet’s reconstruction

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
May 11, 6:45 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 172 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 2000-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2323 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 2000-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.19395878Sfc1 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
2323 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1261 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
1.8
Supercell composite
13.9

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KARX 120126
TORLSE
IAC043-120200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
825 PM CDT THU MAY 11 2000

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CLAYTON COUNTY IN NORTHEAST IOWA

* UNTIL 900 PM CDT

* AT 825 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A DEVELOPING TORNADO NEAR MONONA...OR ABOUT 12 MILES WEST OF 
  PRAIRIE DU CHIEN...MOVING EAST AT 25 MPH.  THE PUBLIC HAS REPORTED 
  A FUNNEL CLOUD WITH THIS STORM. 

* THE TORNADO IS EXPECTED TO BE...
  NEAR GIARD AND FROELICH AT 830 PM CDT
  NEAR MARQUETTE AT 840 PM CDT
  NEAR MCGREGOR AT 845 PM CDT

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

WELVAERT

LAT...LON 4308 9146 4299 9150 4293 9114 4308 9117

The office that day

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

IssuedProductOfficeCountiesLasted
May 11, 7:00 PM CDTSevere Thunderstorm WarningARXChickasaw30 min
May 11, 7:15 PM CDTSevere Thunderstorm WarningARXFayette60 min
May 11, 7:58 PM CDTSevere Thunderstorm WarningARXAllamakee62 min
May 11, 8:12 PM CDTSevere Thunderstorm WarningARXFayette78 min
May 11, 8:50 PM CDTSevere Thunderstorm WarningARXWinneshiek40 min
May 12, 6:13 AM CDTSevere Thunderstorm WarningARXAllamakee, Winneshiek32 min
May 12, 6:43 AM CDTSevere Thunderstorm WarningARXAllamakee62 min

Nearby

Tornado Warnings in Iowa, 2000Every tornado warning in 2000Tornadoes in 2000

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.