Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 69, NWS La Crosse, WI

July 18, 20114 counties in Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 18, 2011, 9:38 AM CDT for 4 counties in Wisconsin. It was in force for 37 min. 1 report 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: Jul 18, 2011, 9:38 AM CDT (14:38 UTC)
Expired: Jul 18, 2011, 10:15 AM CDT
In force: 37 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The La Crosse radar (KARX), 30 km from the middle of the area, began a volume at 14:38 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
Jul 18, 9:45 AM CDT	TSTM WND DMG	6 Ne Cataract, WI	NUMEROUS TREES BETWEEN 6 AND 24 INCHES IN DIAMETER UPROOTED ALONG AMBER RD. LARGE BARN SHIFTED APPROX 10 INCHES OFF FOUNDATION AND ROOF BLOWN OFF AT DIARY FARM.

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
Jul 18, 8:05 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 2.6 hours before the alert went out and 216 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: 3081 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1082 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

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

909 
WUUS53 KARX 181438
SVRARX
WIC053-063-081-121-181515-
/O.NEW.KARX.SV.W.0069.110718T1438Z-110718T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
938 AM CDT MON JUL 18 2011

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN JACKSON COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHERN LA CROSSE COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHWESTERN MONROE COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHERN TREMPEALEAU COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1015 AM CDT

* AT 933 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM CATARACT
  TO GALESVILLE TO TREMPEALEAU...MOVING SOUTHEAST AT 30 MPH. THESE
  STORMS CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH.  

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  HOLMEN AROUND 1000 AM...

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.

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

&&

LAT...LON 4396 9081 4394 9137 4405 9151 4409 9154
      4421 9145 4407 9097 4418 9095 4424 9090
      4415 9060
TIME...MOT...LOC 1438Z 308DEG 25KT 4402 9094 4409 9123
          4405 9143
WIND...HAIL 60MPH 1.00IN

$$

DTJ

3 follow-up statements

639 
WWUS53 KARX 181451
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
951 AM CDT MON JUL 18 2011

WIC053-063-081-121-181515-
/O.CON.KARX.SV.W.0069.000000T0000Z-110718T1515Z/
JACKSON WI-LA CROSSE WI-MONROE WI-TREMPEALEAU WI-
951 AM CDT MON JUL 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
TREMPEALEAU...NORTHWESTERN MONROE...NORTHERN LA CROSSE AND
SOUTHWESTERN JACKSON COUNTIES UNTIL 1015 AM CDT...

AT 947 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM SPARTA TO
NORTH BEND TO TREMPEALEAU...MOVING SOUTHEAST AT 30 MPH. THESE STORMS
CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  HOLMEN AROUND 1010 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THESE
STORMS...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING
WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER
LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM MONDAY
AFTERNOON FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

&&

LAT...LON 4396 9081 4394 9137 4405 9151 4409 9154
      4421 9145 4407 9097 4418 9095 4424 9090
      4415 9060
TIME...MOT...LOC 1451Z 308DEG 25KT 4396 9084 4403 9113
          4399 9133
WIND...HAIL 60MPH 1.75IN

$$

DTJ

916 
WWUS53 KARX 181507
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1007 AM CDT MON JUL 18 2011

WIC121-181517-
/O.CAN.KARX.SV.W.0069.000000T0000Z-110718T1515Z/
TREMPEALEAU WI-
1007 AM CDT MON JUL 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TREMPEALEAU COUNTY IS
CANCELLED...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM CDT MONDAY
AFTERNOON FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

LAT...LON 4415 9095 4416 9089 4415 9060 4396 9081
      4395 9112 4400 9112 4410 9106 4407 9097
TIME...MOT...LOC 1507Z 308DEG 25KT 4389 9072 4396 9101
          4392 9121

$$

WIC053-063-081-181515-
/O.CON.KARX.SV.W.0069.000000T0000Z-110718T1515Z/
JACKSON WI-LA CROSSE WI-MONROE WI-
1007 AM CDT MON JUL 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
MONROE...NORTHEASTERN LA CROSSE AND EXTREME SOUTH CENTRAL JACKSON
COUNTIES UNTIL 1015 AM CDT...

AT 1006 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WERE ROUGHLY ALONG A LINE EXTENDING FROM SPARTA TO
BANGOR TO ONALASKA...MOVING SOUTHEAST AT 30 MPH. THESE STORMS CAN
PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS
IN EXCESS OF 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THESE
STORMS...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. DAMAGING
WINDS ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER
LINES. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM MONDAY
AFTERNOON FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

&&

LAT...LON 4415 9095 4416 9089 4415 9060 4396 9081
      4395 9112 4400 9112 4410 9106 4407 9097
TIME...MOT...LOC 1507Z 308DEG 25KT 4389 9072 4396 9101
          4392 9121
WIND...HAIL 60MPH 1.75IN

$$

DTJ

679 
WWUS53 KARX 181514
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1014 AM CDT MON JUL 18 2011

WIC053-063-081-181524-
/O.EXP.KARX.SV.W.0069.000000T0000Z-110718T1515Z/
JACKSON WI-LA CROSSE WI-MONROE WI-
1014 AM CDT MON JUL 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONROE...
NORTHEASTERN LA CROSSE AND EXTREME SOUTHWESTERN JACKSON COUNTIES WILL
EXPIRE AT 1015 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS. HOWEVER...THE LINE OF STORMS REMAINS STRONG AND COULD
PRODUCE SMALL HAIL AND GUSTY WINDS...IN ADDITION TO LIGHTNING AND
HEAVY RAIN.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM CDT MONDAY
AFTERNOON FOR NORTHEAST IOWA AND SOUTHEAST MINNESOTA AND SOUTHWESTERN
WISCONSIN.

LAT...LON 4415 9095 4416 9089 4415 9060 4396 9081
      4395 9112 4400 9112 4410 9106 4407 9097
TIME...MOT...LOC 1514Z 308DEG 25KT 4386 9067 4393 9096
          4389 9116

$$

DTJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:29 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	25 min
Jul 18, 8:46 AM CDT	Flash Flood Warning	ARX	Jackson, Trempealeau	4 hr
Jul 18, 9:01 AM CDT	Severe Thunderstorm Warning	ARX	Jackson, Trempealeau	44 min
Jul 18, 9:32 AM CDT	Flash Flood Warning	ARX	Jackson, Monroe	3 hr

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.