Alert archive / Wisconsin / Tornado Warnings in 2007

Tornado Warning 3, NWS La Crosse, WI

March 31, 2007Vernon County, Wisconsin

NWS La Crosse, WI issued this tornado warning at Mar 31, 2007, 6:49 PM CDT for Vernon County, Wisconsin. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 31, 2007, 6:49 PM CDT (23:49 UTC)
Expired
Mar 31, 2007, 7:15 PM CDT
In force
26 min
Issued by
NWS La Crosse, WI
Area
Counties, with a storm outline in the text

County Vernon County, WI

The radar

The La Crosse radar (KARX), 29 km from the middle of the area, began a volume at 23:51 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 31, 5:11 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 224 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 2007-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2007-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 290 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
843 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
290 m²/s²
0-3 km storm-relative helicity
318 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KARX 312349
TORARX
WIC123-010015-
/O.NEW.KARX.TO.W.0003.070331T2349Z-070401T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
649 PM CDT SAT MAR 31 2007

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL VERNON COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 715 PM CDT

* AT 647 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO NEAR FARGO...OR ABOUT 8 MILES SOUTH OF VIROQUA...MOVING
  NORTH AT 50 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  FARGO AND FOLSOM AROUND 650 PM...
  BUD AND COUNTY ROADS B AND Y AROUND 655 PM...
  RUNGE HOLLOW AND COUNTY ROADS O AND Y AROUND 700 PM...
  NEWRY AND SPRING RIDGE AROUND 705 PM...

TAKE COVER IN A BASEMENT OR IN AN INTERIOR ROOM ON THE LOWEST FLOOR
AND STAY AWAY FROM WINDOWS

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM SATURDAY EVENING FOR
NORTHEASTERN IOWA.

LAT...LON 4343 9103 4358 9104 4359 9106 4368 9106
      4371 9107 4371 9103 4373 9101 4372 9082
      4342 9081

$$

DTJ
2 follow-up statements
000 
WWUS53 KARX 010002
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
702 PM CDT SAT MAR 31 2007

WIC123-010015-
/O.CON.KARX.TO.W.0003.000000T0000Z-070401T0015Z/
VERNON WI-
702 PM CDT SAT MAR 31 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR CENTRAL
VERNON COUNTY...

AT 700 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION. THIS TORNADO WAS LOCATED
NEAR WESTBY...OR 6 MILES NORTH OF VIROQUA...MOVING NORTH AT 50 MPH.

TORRENTIAL RAINFALL FROM THESE STORMS MAY ALSO CAUSE THE PONDING OF
WATER ON ROADWAYS AND LOCALIZED FLOODING.

CARS AND MOBILE HOMES SHOULD BE ABANDONED FOR A STURDY BUILDING. AS A
LAST RESORT...LAY FLAT IN A DITCH AND COVER YOUR HEAD.

LAT...LON 4343 9103 4358 9104 4359 9106 4368 9106
      4371 9107 4371 9103 4373 9101 4372 9082
      4342 9081

$$

DTJ
000 
WWUS53 KARX 010012
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
712 PM CDT SAT MAR 31 2007

WIC123-010022-
/O.EXP.KARX.TO.W.0003.000000T0000Z-070401T0015Z/
VERNON WI-
712 PM CDT SAT MAR 31 2007

...THE TORNADO WARNING FOR CENTRAL VERNON COUNTY EXPIRES AT 715 PM
CDT...

THE STORM WHICH PROMPTED THIS WARNING HAS WEAKENED AND NO LONGER
APPEARS CAPABLE OF PRODUCING SEVERE WEATHER.

A TORNADO WATCH REMAINS IN EFFECT FOR THE AREA.

STRONG STORMS ARE STILL POSSIBLE. THEREFORE...PERSONS ARE URGED TO
STAY TUNED TO YOUR FAVORITE MEDIA SOURCE FOR THE LATEST WEATHER
INFORMATION.

LAT...LON 4343 9103 4358 9104 4359 9106 4368 9106
      4371 9107 4371 9103 4373 9101 4372 9082
      4342 9081

$$

DTJ

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 31, 6:12 PM CDTSevere Thunderstorm WarningARXCrawford33 min
Mar 31, 6:25 PM CDTTornado WarningARXGrant35 min
Mar 31, 6:48 PM CDTTornado WarningARXRichland42 min

Nearby

Tornado Warnings in Wisconsin, 2007Every tornado warning in 2007Tornadoes in 2007

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.