Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 72, NWS La Crosse, WI

July 18, 2012Crawford County, Vernon County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 18, 2012, 4:23 PM CDT for Crawford County, Vernon County, Wisconsin. It was in force for 52 min. 3 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: Jul 18, 2012, 4:23 PM CDT (21:23 UTC)
Expired: Jul 18, 2012, 5:15 PM CDT
In force: 52 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.5 in
Wind: 60.0 mph

Counties Crawford County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 40 km from the middle of the area, began a volume at 21:24 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, 4:45 PM CDT	TSTM WND DMG	Ferryville, WI	TREES AND POWER LINES DOWN AROUND FERRYVILLE.
Jul 18, 4:50 PM CDT	TSTM WND DMG	Seneca, WI	REPORTS OF TREES POWER LINES DOWN ACROSS CRAWFORD COUNTY. LOCATION ESTIMATED FROM RADAR.
Jul 18, 4:50 PM CDT	NON-TSTM WND DMG	Seneca, WI	REPORTS OF TREES POWER LINES DOWN ACROSS CRAWFORD COUNTY. LOCATION 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
Jul 18, 12:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 211 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: 1900 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1674 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 44 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.

681 
WUUS53 KARX 182123
SVRARX
WIC023-123-182215-
/O.NEW.KARX.SV.W.0072.120718T2123Z-120718T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
423 PM CDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CRAWFORD COUNTY IN SOUTHWEST WISCONSIN...
  WESTERN VERNON COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 515 PM CDT

* AT 420 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  DAMAGING WINDS FROM APPROACHING THUNDERSTORMS IN SOUTHEAST
  MINNESOTA AND NORTHEAST IOWA. THEY WERE MOVING EAST AT 30 MPH.
  THERE HAS BEEN REPORTS OF WIND DAMAGE AND TREES DOWN WITH STORMS
  TO THE WEST. 

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  DE SOTO AROUND 435 PM...
  STODDARD AROUND 440 PM...
  COON VALLEY AROUND 505 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...STAY AWAY FROM TREES AND 
MOVE INSIDE.

SEVERE THUNDERSTORMS POSE A SIGNIFICANT DANGER TO BOATERS. IF ON AREA
RIVERS...IMMEDIATELY MOVE TO SHORE AND FIND SHELTER.

&&

LAT...LON 4323 9108 4326 9106 4331 9111 4336 9121
      4341 9120 4345 9123 4351 9122 4354 9125
      4359 9123 4361 9127 4366 9127 4373 9126
      4372 9100 4351 9087 4327 9086
TIME...MOT...LOC 2121Z 251DEG 26KT 4361 9142 4346 9130
          4337 9127 4325 9137
WIND...HAIL 60MPH <.50IN

$$

SHEA

2 follow-up statements

424 
WWUS53 KARX 182153
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
453 PM CDT WED JUL 18 2012

WIC023-123-182215-
/O.CON.KARX.SV.W.0072.000000T0000Z-120718T2215Z/
CRAWFORD WI-VERNON WI-
453 PM CDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN VERNON
AND NORTHWESTERN CRAWFORD COUNTIES UNTIL 515 PM CDT...

STRONG WINDS CONTINUE TO SURGE AHEAD OF THUNDERSTORMS OVER SOUTHWEST 
WISCONSIN AND COULD BE PRODUCING DAMAGE. AFTER THE WIND...HEAVY RAIN 
AND LIGHTNING WILL MOVE IN AND LAST FOR 30 TO 60 MINUTES.

STRONG WINDS COULD ALSO BE OCCURRING INTO THE PRAIRIE DU CHIEN AND 
STEUBEN AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR 
DAMAGING WINDS. SEEK SHELTER AND STAY AWAY FROM TREES THAT MIGHT 
FALL.

&&

LAT...LON 4323 9108 4326 9106 4331 9111 4336 9121
      4341 9120 4345 9123 4351 9122 4354 9125
      4359 9123 4361 9127 4366 9127 4373 9126
      4372 9100 4351 9087 4327 9086
TIME...MOT...LOC 2151Z 251DEG 26KT 4362 9102 4354 9096
          4340 9091 4327 9090
WIND...HAIL 60MPH <.50IN

$$

SHEA

687 
WWUS53 KARX 182200
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
500 PM CDT WED JUL 18 2012

WIC123-182209-
/O.CAN.KARX.SV.W.0072.000000T0000Z-120718T2215Z/
VERNON WI-
500 PM CDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN VERNON COUNTY
HAS BEEN CANCELLED...

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

A WARNING REMAINS IN EFFECT FOR ALL OF CRAWFORD COUNTY WISCONSIN 
UNTIL 530 PM.

LAT...LON 4323 9108 4326 9106 4331 9111 4336 9121
      4341 9120 4345 9123 4351 9122 4354 9125
      4359 9123 4361 9127 4366 9127 4373 9126
      4372 9100 4351 9087 4327 9086
TIME...MOT...LOC 2159Z 251DEG 26KT 4364 9094 4356 9088
          4342 9083 4329 9083

$$


SHEA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 7:19 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	38 min
Jul 18, 4:57 PM CDT	Severe Thunderstorm Warning	ARX	Crawford	33 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.