Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 29, NWS La Crosse, WI

May 6, 2012Grant County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at May 6, 2012, 8:39 AM CDT for Grant County, Wisconsin. It was in force for 20 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: May 6, 2012, 8:39 AM CDT (13:39 UTC)
Expired: May 6, 2012, 8:59 AM CDT
In force: 20 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Grant County, WI

The radar

The La Crosse radar (KARX), 115 km from the middle of the area, began a volume at 13:40 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
May 6, 8:42 AM CDT	HAIL 1	5 W Livingston, WI

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 1.7 hours before the alert went out and 143 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: 2361 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.6

Open this sounding in Storm Lab

The text

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

887 
WUUS53 KARX 061339
SVRARX
WIC043-061415-
/O.NEW.KARX.SV.W.0029.120506T1339Z-120506T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
839 AM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

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

* UNTIL 915 AM CDT

* AT 835 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR STITZER...OR 6 MILES EAST OF
  LANCASTER...MOVING NORTHEAST AT 30 MPH. THIS STORM CAN PRODUCE
  QUARTER SIZE HAIL.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ANNATON AND PRESTON AROUND 845 AM...
  LIVINGSTON AROUND 850 AM...
  MONTFORT AROUND 855 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4280 9066 4290 9070 4304 9043 4303 9042
      4286 9042
TIME...MOT...LOC 1339Z 242DEG 28KT 4288 9056
WIND...HAIL <50MPH 1.00IN

$$

BOYNE

3 follow-up statements

415 
WWUS53 KARX 061345
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
845 AM CDT SUN MAY 6 2012

WIC043-061415-
/O.CON.KARX.SV.W.0029.000000T0000Z-120506T1415Z/
GRANT WI-
845 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GRANT COUNTY UNTIL 915 AM CDT...

AT 845 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR ANNATON...OR 8 MILES EAST OF
LANCASTER...MOVING NORTHEAST AT 30 MPH. THIS STORM CAN PRODUCE
QUARTER SIZE HAIL.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LIVINGSTON AROUND 850 AM...
  MONTFORT AROUND 855 AM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4280 9066 4290 9070 4304 9043 4303 9042
      4286 9042
TIME...MOT...LOC 1345Z 242DEG 28KT 4290 9050
WIND...HAIL <50MPH 1.00IN

$$

BOYNE

665 
WWUS53 KARX 061350
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
850 AM CDT SUN MAY 6 2012

WIC043-061415-
/O.CON.KARX.SV.W.0029.000000T0000Z-120506T1415Z/
GRANT WI-
850 AM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GRANT COUNTY UNTIL 915 AM CDT...

AT 849 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM LOCATED NEAR LIVINGSTON...OR 12 MILES NORTH OF
PLATTEVILLE...MOVING NORTHEAST AT 30 MPH. THIS STORM CAN PRODUCE
QUARTER SIZE HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4280 9066 4290 9070 4304 9043 4303 9042
      4286 9042
TIME...MOT...LOC 1350Z 242DEG 28KT 4292 9045
WIND...HAIL <50MPH 1.00IN

$$

BOYNE

790 
WWUS53 KARX 061359
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
859 AM CDT SUN MAY 6 2012

WIC043-061409-
/O.CAN.KARX.SV.W.0029.000000T0000Z-120506T1415Z/
GRANT WI-
859 AM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GRANT COUNTY IS
CANCELLED...

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

LAT...LON 4280 9066 4290 9070 4304 9043 4303 9042
      4286 9042
TIME...MOT...LOC 1359Z 242DEG 28KT 4295 9037

$$

BOYNE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 7:45 AM CDT	Severe Thunderstorm Warning	ARX	Adams	18 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.