Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 97, NWS La Crosse, WI

September 2, 20115 counties in Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 2, 2011, 7:33 AM CDT for 5 counties in Wisconsin. It was in force for 42 min. 11 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 2, 2011, 7:33 AM CDT (12:33 UTC)
Expired: Sep 2, 2011, 8:15 AM CDT
In force: 42 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Jackson County, WI, La Crosse County, WI, Monroe County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 25 km from the middle of the area, began a volume at 12:34 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 2, 7:34 AM CDT	TSTM WND GST 70	3 Ne Westby, WI	LARGE PINE TREE DOWN ON HOUSE. DAMAGE TO HOUSE.
Sep 2, 7:47 AM CDT	TSTM WND DMG	Cashton, WI	TREE DOWN ON HOME. 3 TREES DOWN ON POWERLINE ON NEWPORT RD.
Sep 2, 7:47 AM CDT	TSTM WND GST 45	Sparta, WI
Sep 2, 7:50 AM CDT	TSTM WND DMG	4 S Norwalk, WI	14 INCH DIAMETER TREE DOWN. JACK PINE TREES SNAPPED OFF. LARGE OAK TREE SPLIT.
Sep 2, 7:52 AM CDT	TSTM WND DMG	4 E Cataract, WI	SEVERAL LARGE TREES DOWN ALONG COUNTY ROAD II
Sep 2, 7:52 AM CDT	TSTM WND DMG	Wilton, WI	TREES DOWN ON POWER LINES. POWER OUT.
Sep 2, 7:56 AM CDT	TSTM WND GST 45	Fort Mc Coy, WI	ALONG JACKSON PASS ON HIGHWAY 16
Sep 2, 7:56 AM CDT	TSTM WND GST 60	4 E Cataract, WI
Sep 2, 7:59 AM CDT	TSTM WND DMG	3 Sw Norwalk, WI	TREE DOWN ON MOBILE HOME
Sep 2, 8:00 AM CDT	TSTM WND DMG	Oakdale, WI	VERY LARGE TREE BRANCHES DOWN. SOME FELL ON ROOF AND HIT SIDING CAUSING ROOF AND SIDING DAMAGE.
Sep 2, 8:02 AM CDT	TSTM WND GST 60	Tomah, 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.

Issued	Product	Office	Lasted
Sep 2, 3:48 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 0.6 hours before the alert went out and 233 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: 2366 J/kg
Mixed-layer CIN: -254 J/kg
Mixed-layer LCL: 999 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 0 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.

437 
WUUS53 KARX 021233
SVRARX
WIC053-063-081-121-123-021315-
/O.NEW.KARX.SV.W.0097.110902T1233Z-110902T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
733 AM CDT FRI SEP 2 2011

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN VERNON COUNTY IN SOUTHWEST WISCONSIN...
  SOUTHERN JACKSON COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHEASTERN LA CROSSE COUNTY IN WEST CENTRAL WISCONSIN...
  MONROE COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHEASTERN TREMPEALEAU COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 815 AM CDT

* AT 729 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED 7 MILES WEST OF I 90 EXIT 15...OR 9
  MILES NORTHEAST OF LA CROSSE...MOVING EAST AT 65 MPH. THIS STORM
  CAN PRODUCE PENNY SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
   

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CASHTON AND HIGHWAY 162 AND COUNTY T AROUND 740 AM...
  SPARTA AND BLACK RIVER FALLS AROUND 745 AM...
  FORT MC COY AND JACKSON PASS AROUND 750 AM...
  MILLSTON AND TUNNEL CITY AROUND 755 AM...
  TOMAH AND HILLSBORO AROUND 800 AM...
  WYEVILLE AND NORMAY RIDGE AROUND 805 AM...
  CITY POINT AROUND 810 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4354 9094 4407 9104 4404 9139 4424 9144
      4442 9033 4357 9032
TIME...MOT...LOC 1234Z 256DEG 57KT 4393 9102
WIND...HAIL 60MPH 0.75IN

$$

04

3 follow-up statements

114 
WWUS53 KARX 021302
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
802 AM CDT FRI SEP 2 2011

WIC063-121-021312-
/O.CAN.KARX.SV.W.0097.000000T0000Z-110902T1315Z/
LA CROSSE WI-TREMPEALEAU WI-
802 AM CDT FRI SEP 2 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TREMPEALEAU AND
NORTHEASTERN LA CROSSE COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM CDT
FRIDAY MORNING FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND
SOUTHWESTERN WISCONSIN.

LAT...LON 4355 9074 4409 9089 4429 9112 4442 9033
      4357 9032
TIME...MOT...LOC 1302Z 256DEG 57KT 4403 9042

$$

WIC053-081-123-021315-
/O.CON.KARX.SV.W.0097.000000T0000Z-110902T1315Z/
JACKSON WI-MONROE WI-VERNON WI-
802 AM CDT FRI SEP 2 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
VERNON...MONROE AND SOUTHERN JACKSON COUNTIES UNTIL 815 AM CDT...

SPOTTERS REPORTED 60 MPH WINDS IN THE CATARACT AREA.

AT 757 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR I 94 EXIT 143...OR NEAR TOMAH...
MOVING EAST AT 65 MPH. THIS STORM CAN PRODUCE PENNY SIZE HAIL AND
DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NORMAY RIDGE AROUND 805 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM FRIDAY
MORNING FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

&&

LAT...LON 4355 9074 4409 9089 4429 9112 4442 9033
      4357 9032
TIME...MOT...LOC 1302Z 256DEG 57KT 4403 9042
WIND...HAIL 60MPH 0.75IN

$$

344 
WWUS53 KARX 021309
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
809 AM CDT FRI SEP 2 2011

WIC053-081-123-021315-
/O.CON.KARX.SV.W.0097.000000T0000Z-110902T1315Z/
JACKSON WI-MONROE WI-VERNON WI-
809 AM CDT FRI SEP 2 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
VERNON...EASTERN MONROE AND SOUTHERN JACKSON COUNTIES UNTIL 815 AM
CDT...

TRAINED WEATHER SPOTTERS REPORTED WINDS OF 60 MPH NEAR TOMAH WITH A 
SEVERE THUNDERSTORM. TREES HAVE ALSO BEEN REPORTED DOWN ACROSS THE 
EASTERN PART OF VERNON COUNTY.

AT 806 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR WYEVILLE...OR 9 MILES EAST OF
TOMAH...MOVING EAST AT 65 MPH. THIS STORM CAN PRODUCE PENNY SIZE HAIL
AND DAMAGING WINDS IN EXCESS OF 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM FRIDAY
MORNING FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

&&

LAT...LON 4356 9061 4408 9073 4431 9099 4442 9033
      4357 9032
TIME...MOT...LOC 1309Z 256DEG 57KT 4405 9027
WIND...HAIL 60MPH 0.75IN

$$

04

883 
WWUS53 KARX 021314
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
814 AM CDT FRI SEP 2 2011

WIC053-081-123-021324-
/O.EXP.KARX.SV.W.0097.000000T0000Z-110902T1315Z/
JACKSON WI-MONROE WI-VERNON WI-
814 AM CDT FRI SEP 2 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN VERNON...EASTERN
MONROE AND SOUTHERN JACKSON COUNTIES WILL EXPIRE AT 815 AM CDT...

AT 759 AM CDT...A TREE WAS REPORTED DOWN ON A MOBILE HOME IN THE 
NORWALK AREA.

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM CDT
FRIDAY MORNING FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND
SOUTHWESTERN WISCONSIN.

LAT...LON 4356 9061 4408 9073 4431 9099 4442 9033
      4357 9032
TIME...MOT...LOC 1314Z 256DEG 57KT 4406 9016

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 7:02 AM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Trempealeau, Vernon	58 min
Sep 2, 8:00 AM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	45 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every severe thunderstorm warning in 2011

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.