Alert archive / Iowa / Tornado Warnings in 2001

Tornado Warning 12, NWS La Crosse, WI

September 6, 2001Clayton County, Fayette County, Iowa

NWS La Crosse, WI issued this tornado warning at Sep 6, 2001, 6:21 PM CDT for Clayton County, Fayette County, Iowa. It was in force for 24 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
Sep 6, 2001, 6:21 PM CDT (23:21 UTC)
Expired
Sep 6, 2001, 6:45 PM CDT
In force
24 min
Issued by
NWS La Crosse, WI
Area
Whole counties

Counties Clayton County, IA, Fayette County, IA

The radar

The La Crosse radar (KARX), 113 km from the middle of the area, began a volume at 23:21 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.

What was reported inside it

TimeReportWhereRemark
Sep 6, 6:21 PM CDTTornado F1Arlington, 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

Davenport, (KDVN), launched 12:00Z, 11.4 hours before the alert went out and 164 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 2001-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 377 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 2001-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.1939Sfc1 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
377 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1024 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
99 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.

245 
WFUS53 KARX 062321
TORLSE
IAC043-065-062345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
621 PM CDT THU SEP 6 2001

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

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

* UNTIL 645 PM CDT

* AT 621 PM CDT...LAW ENFORCEMENT OFFICIALS REPORTED A TORNADO OVER
  ARLINGTON...OR ABOUT 14 MILES EAST OF OELWEIN...MOVING NORTH AT 65
  MPH.

* THE TORNADO IS EXPECTED TO BE...
  NEAR ELGIN...AND CLERMONT AT 630 PM CDT...

THIS STORM HAS A HISTORY OF PRODUCING A TORNADO. GO TO THE BASEMENT
IF A BASEMENT IS NOT AVAILABLE...GO TO AN INTERIOR ROOM ON THE LOWEST
FLOOR

$$

&

Nearby

Tornado Warnings in Iowa, 2001Every tornado warning in 2001Tornadoes in 2001

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; radar from the NEXRAD Level II archive.