Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 73, NWS La Crosse, WI

July 18, 2012Crawford County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 18, 2012, 4:57 PM CDT for Crawford County, Wisconsin. It was in force for 33 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, 4:57 PM CDT (21:57 UTC)
Expired
Jul 18, 2012, 5:30 PM CDT
In force
33 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Hail
0.5 in
Wind
60.0 mph

County Crawford County, WI

The radar

The La Crosse radar (KARX), 74 km from the middle of the area, began a volume at 21:56 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

TimeReportWhereRemark
Jul 18, 5:01 PM CDTTSTM WND DMGPrairie Du Chien, WITREES AND POWERLINES DOWN.
Jul 18, 5:03 PM CDTTSTM WND DMGMount Zion, WINUMEROUS BRANCHES DOWN AND A FEW TREES DOWN ON RESIDENCE AND NEIGHBORS RESIDENCE.
Jul 18, 5:12 PM CDTTSTM WND GST 72Prairie Du Chien, WIMATURE TREES DOWN IN PARTS OF TOWN.

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.

IssuedProductOfficeLasted
Jul 18, 12:58 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 177 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1900 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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.

528 
WUUS53 KARX 182157
SVRARX
WIC023-182230-
/O.NEW.KARX.SV.W.0073.120718T2157Z-120718T2230Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

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

* UNTIL 530 PM CDT

* AT 452 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ROUGHLY ALONG A LINE EXTENDING FROM LANSING TO
  HARPERS FERRY TO PRAIRIE DU CHIEN...MOVING EAST AT 40 MPH. THESE
  STORMS CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH. THIS WARNING
  REPLACES THE PREVIOUS WARNING FOR NORTHWEST PARTS OF CRAWFORD
  COUNTY.

* THE SEVERE THUNDERSTORMS WILL BE NEAR...
  LYNXVILLE AND PRAIRIE DU CHIEN AROUND 5 PM...
  STEUBEN AROUND 510 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4300 9115 4314 9116 4326 9106 4332 9111
      4336 9121 4342 9120 4342 9068 4317 9068
      4312 9075 4311 9080 4307 9087 4307 9093
      4299 9106
TIME...MOT...LOC 2156Z 273DEG 34KT 4340 9110 4322 9098
          4303 9097
WIND...HAIL 60MPH <.50IN

$$

SHEA
2 follow-up statements
883 
WWUS53 KARX 182210
SVSARX

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

WIC023-182230-
/O.CON.KARX.SV.W.0073.000000T0000Z-120718T2230Z/
CRAWFORD WI-
510 PM CDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CRAWFORD
COUNTY UNTIL 530 PM CDT...

AT 5 PM...SCATTERED THUNDERSTORMS WERE OVER MOST OF CRAWFORD COUNTY. 
STRONG WINDS HAD PUSHED NEARLY TO THE CRAWFORD-RICHLAND COUNTY LINE 
WHILE ADDITIONAL STORMS WERE OVER PRAIRIE DU CHIEN. IN ADDITION TO 
STRONG WINDS...LIGHTNING AND HEAVY RAIN CAN BE EXPECTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY INDOORS AND AVOID CREEKS AND STREAMS THAT MAY FLOOD. WATCH FOR 
TREES OR BRANCHES COULD TOPPLE IN HIGH WIND.

&&

LAT...LON 4300 9115 4314 9116 4326 9106 4332 9111
      4336 9121 4342 9120 4342 9068 4317 9068
      4312 9075 4311 9080 4307 9087 4307 9093
      4299 9106
TIME...MOT...LOC 2208Z 278DEG 30KT 4336 9100 4318 9089
          4307 9090
WIND...HAIL 60MPH <.50IN

$$

SHEA
065 
WWUS53 KARX 182227
SVSARX

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

WIC023-182236-
/O.EXP.KARX.SV.W.0073.000000T0000Z-120718T2230Z/
CRAWFORD WI-
527 PM CDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR CRAWFORD COUNTY WILL EXPIRE AT
530 PM CDT...

THE STRONGEST WINDS FROM STORMS HAVE MOVED EAST OF THE AREA. WHILE 
SOME HEAVY RAIN AND LIGHTNING MAY LINGER...THE SEVERE WEATHER RISK 
APPEARS TO BE OVER AND HENCE THE WARNING WILL BE ALLOWED TO EXPIRE 
AT 530 PM.

LAT...LON 4300 9115 4314 9116 4326 9106 4332 9111
      4336 9121 4342 9120 4342 9068 4317 9068
      4312 9075 4311 9080 4307 9087 4307 9093
      4299 9106
TIME...MOT...LOC 2226Z 278DEG 30KT 4334 9079 4316 9069
          4305 9070

$$

SHEA

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 7:19 PM CDTSevere Thunderstorm WarningARXAdams, Juneau38 min
Jul 18, 4:23 PM CDTSevere Thunderstorm WarningARXCrawford, Vernon52 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Every 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.