Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 98, NWS La Crosse, WI

September 4, 2012Clark County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 5:41 PM CDT for Clark County, Wisconsin. It was in force for 64 min. 4 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, 5:41 PM CDT (22:41 UTC)
Expired: Sep 4, 2012, 6:45 PM CDT
In force: 64 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Clark County, WI

The radar

The La Crosse radar (KARX), 126 km from the middle of the area, began a volume at 22:41 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

Time	Report	Where	Remark
Sep 4, 5:50 PM CDT	TSTM WND GST 40	7 S Junction, WI	ALSO PEA SIZED HAIL
Sep 4, 6:09 PM CDT	TSTM WND DMG	Greenwood, WI	TREE DOWN NEAR THE POST OFFICE IN GREENWOOD.
Sep 4, 6:13 PM CDT	TSTM WND DMG	Loyal, WI	SEVERAL SMALL TREES DOWN AROUND TOWN.
Sep 4, 6:13 PM CDT	TSTM WND GST 50	3 S Longwood, WI	PEA TO DIME SIZED HAIL ALSO

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.

Issued	Product	Office	Lasted
Sep 4, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.7 hours before the alert went out and 204 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

213 
WUUS53 KARX 042241
SVRARX
WIC019-042345-
/O.NEW.KARX.SV.W.0098.120904T2241Z-120904T2345Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

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

* UNTIL 645 PM CDT

* AT 536 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM THORP TO
  PRICE...MOVING EAST AT 25 MPH. THESE STORMS CAN PRODUCE QUARTER
  SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  THORP AROUND 550 PM...
  OWEN AROUND 615 PM...
  GREENWOOD AROUND 625 PM...
  NEILLSVILLE AND LOYAL AROUND 640 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4501 9034 4455 9055 4463 9093 4503 9093
      4504 9064
TIME...MOT...LOC 2241Z 287DEG 20KT 4499 9084 4468 9102
WIND...HAIL 60MPH 1.00IN

$$

JW

3 follow-up statements

799 
WWUS53 KARX 042258
SVSARX

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

WIC019-042345-
/O.CON.KARX.SV.W.0098.000000T0000Z-120904T2345Z/
CLARK WI-
558 PM CDT TUE SEP 4 2012

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

AT 550 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM THORP TO 11
MILES NORTHEAST OF PRICE...MOVING EAST AT 25 MPH. THESE STORMS CAN
PRODUCE PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.

TRAINED WEATHER SPOTTERS REPORTED 40 MPH WIND GUSTS AND PEA SIZE 
HAIL AT 550 PM. 

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  OWEN AROUND 615 PM...
  GREENWOOD AROUND 620 PM...
  NEILLSVILLE AND LOYAL AROUND 635 PM...

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 4501 9034 4455 9055 4463 9093 4503 9093
      4504 9064
TIME...MOT...LOC 2256Z 287DEG 20KT 4497 9073 4468 9086
WIND...HAIL 60MPH 0.75IN

$$

JW

276 
WWUS53 KARX 042321
SVSARX

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

WIC019-042345-
/O.CON.KARX.SV.W.0098.000000T0000Z-120904T2345Z/
CLARK WI-
621 PM CDT TUE SEP 4 2012

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

TRAINED WEATHER SPOTTERS REPORTED WINDS OF 50 MPH IN GREENWOOD WITH 
A LINE OF SEVERE THUNDERSTORMS.

AT 613 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM OWEN TO
GREENWOOD...MOVING EAST AT 25 MPH. THESE STORMS CAN PRODUCE PENNY 
SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE SEVERE 
THUNDERSTORM WARNING HAS BEEN EXTENDED THROUGH EASTERN CLARK COUNTY 
UNTIL 645 PM. 

ANOTHER SEVERE THUNDERSTORM WAS LOCATED 8 MILES WEST OF ROCK DAM 
LAKE...MOVING EAST AT 25 MPH. THIS STORM CAN ALSO PRODUCE 60 MPH 
WINDS AND PENNY SIZE HAIL. 

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  LOYAL AROUND 625 PM...

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 4501 9067 4501 9034 4455 9055 4463 9093
      4491 9093
TIME...MOT...LOC 2318Z 287DEG 20KT 4496 9042 4470 9057
WIND...HAIL 60MPH 0.75IN

$$

JW

011 
WWUS53 KARX 042344
SVSARX

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

WIC019-042353-
/O.EXP.KARX.SV.W.0098.000000T0000Z-120904T2345Z/
CLARK WI-
644 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR CLARK COUNTY WILL EXPIRE AT
645 PM CDT...

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

THE WARNING FOR NORTHEASTERN CLARK COUNTY WILL ALSO BE ALLOWED TO 
EXPIRE. A STATEMENT WILL BE ISSUED SHORTLY. 

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

LAT...LON 4501 9067 4501 9034 4455 9055 4463 9093
      4491 9093
TIME...MOT...LOC 2343Z 287DEG 20KT 4492 9023 4466 9038

$$

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 4:39 AM CDT	Dense Fog Advisory	ARX	Adams, Buffalo, Clark, Crawford, Grant, Jackson and 7 more	4 hr
Sep 4, 4:29 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	46 min
Sep 4, 5:17 PM CDT	Severe Thunderstorm Warning	ARX	Vernon	28 min
Sep 4, 5:56 PM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Vernon	64 min
Sep 4, 6:16 PM CDT	Severe Thunderstorm Warning	ARX	Clark	29 min
Sep 4, 6:37 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant	38 min
Sep 4, 6:48 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Vernon	57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012 Every 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.