Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 111, NWS La Crosse, WI

September 4, 2012Grant County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 8:51 PM CDT for Grant County, Wisconsin. It was in force for 39 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: Sep 4, 2012, 8:51 PM CDT (01:51 UTC)
Expired: Sep 4, 2012, 9:30 PM CDT
In force: 39 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Grant County, WI

The radar

The Quad Cities radar (KDVN), 124 km from the middle of the area, began a volume at 01:52 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, 9:20 PM CDT	TSTM WND DMG	Potosi, WI	TREES DOWN ACROSS ROAD IN POTOSI. TIME ESTIMATED FROM RADAR.

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

Davenport, (KDVN), launched 00:00Z, 1.9 hours before the alert went out and 125 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: 1890 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1662 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.9

Open this sounding in Storm Lab

The text

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

731 
WUUS53 KARX 050151
SVRARX
WIC043-050230-
/O.NEW.KARX.SV.W.0111.120905T0151Z-120905T0230Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 930 PM CDT

* AT 848 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM
  PLATTEVILLE TO BALLTOWN...MOVING SOUTHEAST AT 20 MPH. THESE STORMS
  CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. LOCAL LAW ENFORCEMENT OFFICIALS HAVE
  ALREADY REPORTED QUARTER SIZE HAIL AND WINDS OF 60 MPH WITH THESE
  STORMS.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  DICKEYVILLE AROUND 905 PM...
  CUBA CITY AROUND 915 PM...
  HAZEL GREEN AROUND 930 PM...

THIS EXTENDEDS THE PREVIOUS WARNING. 

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.

&&

LAT...LON 4264 9072 4268 9095 4275 9107 4287 9110
      4302 9085 4290 9043 4250 9043 4250 9063
TIME...MOT...LOC 0151Z 310DEG 19KT 4271 9040 4264 9088
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

2 follow-up statements

984 
WWUS53 KARX 050209
SVSARX

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

WIC043-050230-
/O.CON.KARX.SV.W.0111.000000T0000Z-120905T0230Z/
GRANT WI-
909 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN GRANT
COUNTY UNTIL 930 PM CDT...

LOCAL LAW ENFORCEMENT OFFICIALS REPORTED QUARTER SIZE HAIL AND WINDS 
OF 60 MPH FROM WEST OF LANCASTER...THROUGH GLEN HAVEN...WITH THIS 
LINE OF SEVERE THUNDERSTORMS.

AT 902 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
LEADING EDGE OF THE THUNDERSTORMS WAS ROUGHLY ALONG A LINE EXTENDING 
FROM CUBA CITY TO KIELER. THE STORMS WERE MOVING SOUTHEAST AT 35 
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...
  HAZEL GREEN AND SINSINAWA AROUND 920 PM...

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.

&&

LAT...LON 4264 9072 4267 9090 4269 9094 4281 9082
      4290 9043 4250 9043 4251 9063
TIME...MOT...LOC 0206Z 321DEG 32KT 4261 9026 4254 9074
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT

125 
WWUS53 KARX 050232
SVSARX

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

WIC043-050242-
/O.EXP.KARX.SV.W.0111.000000T0000Z-120905T0230Z/
GRANT WI-
932 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GRANT COUNTY HAS
EXPIRED...

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 1100 PM CDT
TUESDAY EVENING FOR NORTHEASTERN IOWA AND SOUTHWEST WISCONSIN.

LAT...LON 4264 9072 4267 9090 4269 9094 4281 9082
      4290 9043 4250 9043 4251 9063
TIME...MOT...LOC 0209Z 321DEG 32KT 4259 9024 4252 9072

$$

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 7:00 PM CDT	Severe Thunderstorm Warning	ARX	Grant	60 min
Sep 4, 7:10 PM CDT	Severe Thunderstorm Warning	ARX	Richland	65 min
Sep 4, 7:35 PM CDT	Severe Thunderstorm Warning	ARX	Grant	70 min
Sep 4, 7:41 PM CDT	Tornado Warning	ARX	Grant	34 min
Sep 4, 8:09 PM CDT	Flash Flood Warning	ARX	Crawford, Grant	6 hr
Sep 5, 1:48 AM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Vernon	27 min
Sep 5, 1:51 AM CDT	Flash Flood Warning	ARX	Grant	3 hr
Sep 5, 1:59 AM CDT	Flash Flood Warning	ARX	Crawford, Grant	3 hr

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.