Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 103, NWS La Crosse, WI

September 4, 2012Clark County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 6:16 PM CDT for Clark County, Wisconsin. It was in force for 29 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 4, 2012, 6:16 PM CDT (23:16 UTC)
Expired
Sep 4, 2012, 6:45 PM CDT
In force
29 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Clark County, WI

The radar

The La Crosse radar (KARX), 124 km from the middle of the area, began a volume at 23:18 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 4, 6:17 PM CDTTSTM WND DMG6 Sw Unity, WIWIND GUSTS BETWEEN 617 AND 635 PM TIME ESTIMATED BLEW DOWN LARGE TREES AND POWER LINES ALONG HIGHLINE ROAD
Sep 4, 6:17 PM CDTTSTM WND GST 60Veefkind, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

IssuedProductOfficeLasted
Sep 4, 3:27 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.3 hours before the alert went out and 182 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, Green Bay/Straub, WI at 12:00Z on 2012-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1547 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2012-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
1547 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
496 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
21 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.

668 
WUUS53 KARX 042316
SVRARX
WIC019-042345-
/O.NEW.KARX.SV.W.0103.120904T2316Z-120904T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
616 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CLARK COUNTY IN CENTRAL WISCONSIN...

* UNTIL 645 PM CDT

* AT 613 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM ABBOTSFORD
  TO LOYAL...MOVING EAST AT 20 MPH. THESE STORMS CAN PRODUCE PENNY
  SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. TRAINED WEATHER
  SPOTTERS HAVE ALREADY REPORTED WINDS OF 50 MPH WITH THESE STORMS.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  DORCHESTER AROUND 625 PM...
  ABBOTSFORD AROUND 630 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
SMALL HAIL AND DAMAGING WINDS. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4460 9031 4460 9053 4502 9034 4502 9031
TIME...MOT...LOC 2316Z 291DEG 18KT 4495 9042 4470 9055
WIND...HAIL 60MPH 0.75IN

$$

JW
2 follow-up statements
121 
WWUS53 KARX 042329
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
629 PM CDT TUE SEP 4 2012

WIC019-042345-
/O.CON.KARX.SV.W.0103.000000T0000Z-120904T2345Z/
CLARK WI-
629 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
CLARK COUNTY UNTIL 645 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED A 60 MPH WIND GUST IN VEEFKIND AT 
617 PM.

AT 623 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM ABBOTSFORD TO
LOYAL...MOVING EAST AT 20 MPH. THESE STORMS CAN PRODUCE PENNY SIZE
HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VEEFKIND...
  RIPLINGER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND SMALL HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4460 9031 4460 9053 4502 9034 4502 9031
TIME...MOT...LOC 2327Z 291DEG 18KT 4493 9035 4468 9048
WIND...HAIL 60MPH 0.75IN

$$

JW
550 
WWUS53 KARX 042344 RRA
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
644 PM CDT TUE SEP 4 2012

WIC019-042355-
/O.EXP.KARX.SV.W.0103.000000T0000Z-120904T2345Z/
CLARK WI-
644 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLARK COUNTY HAS
EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT
TUESDAY EVENING FOR NORTHEASTERN IOWA AND SOUTHEAST MINNESOTA AND
WESTERN WISCONSIN.

LAT...LON 4460 9031 4460 9053 4502 9034 4502 9031
TIME...MOT...LOC 2345Z 291DEG 18KT 4490 9023 4465 9036

$$

JW

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 4:39 AM CDTDense Fog AdvisoryARXAdams, Buffalo, Clark, Crawford, Grant, Jackson and 7 more4 hr
Sep 4, 4:29 PM CDTSevere Thunderstorm WarningARXBuffalo46 min
Sep 4, 5:17 PM CDTSevere Thunderstorm WarningARXVernon28 min
Sep 4, 5:41 PM CDTSevere Thunderstorm WarningARXClark64 min
Sep 4, 5:56 PM CDTSevere Thunderstorm WarningARXLa Crosse, Vernon64 min
Sep 4, 6:37 PM CDTSevere Thunderstorm WarningARXCrawford, Grant38 min
Sep 4, 6:48 PM CDTSevere Thunderstorm WarningARXCrawford, Vernon57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.