Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 94, NWS La Crosse, WI

September 4, 2012Buffalo County, Wisconsin; Winona County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 4, 2012, 4:29 PM CDT for Buffalo County, Wisconsin; Winona County, Minnesota. It was in force for 46 min. 2 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
Sep 4, 2012, 4:29 PM CDT (21:29 UTC)
Expired
Sep 4, 2012, 5:15 PM CDT
In force
46 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Winona County, MN, Buffalo County, WI

The radar

The La Crosse radar (KARX), 45 km from the middle of the area, began a volume at 21:33 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
Sep 4, 4:47 PM CDTHAIL 1Winona, MN
Sep 4, 5:01 PM CDTHAIL 0.251 E Winona, MNMOSTLY PEA WITH SOME DIME SIZED HAIL ON THE EAST SIDE OF WINONA

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
Sep 4, 3:27 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.5 hours before the alert went out and 178 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, Minneapolis, MN at 12:00Z on 2012-09-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1446 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2012-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.19395878Sfc1 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
1446 J/kg
Mixed-layer CIN
-171 J/kg
Mixed-layer LCL
1471 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
221 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

539 
WUUS53 KARX 042129
SVRARX
MNC169-WIC011-042215-
/O.NEW.KARX.SV.W.0094.120904T2129Z-120904T2215Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WINONA COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHEASTERN BUFFALO COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 515 PM CDT

* AT 423 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM LOCATED NEAR GOODVIEW...OR NEAR WINONA...MOVING
  EAST AT 15 MPH. THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WINONA AROUND 435 PM...
  BLUFF SIDING AROUND 440 PM...
  DODGE AROUND 450 PM...

THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WINONA HAS BEEN 
CANCELLED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4410 9181 4414 9156 4405 9156 4404 9157
      4403 9156 4398 9156 4401 9174
TIME...MOT...LOC 2128Z 272DEG 15KT 4406 9169
WIND...HAIL 60MPH 1.00IN

$$

BAUMGARDT
3 follow-up statements
662 
WWUS53 KARX 042139
SVSARX

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

MNC169-WIC011-042215-
/O.CON.KARX.SV.W.0094.000000T0000Z-120904T2215Z/
WINONA MN-BUFFALO WI-
439 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
BUFFALO AND CENTRAL WINONA COUNTIES UNTIL 515 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED GOLF BALL SIZE HAIL NEAR STOCKTON 
AT 426 PM WITH THIS SEVERE THUNDERSTORM.

AT 433 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
SEVERE THUNDERSTORM WAS LOCATED NORTHWEST OF WINONA...MOVING EAST AT 
20 MPH. THIS STORM CAN PRODUCE LARGE DAMAGING HAIL UP TO GOLF BALL 
SIZE AND DAMAGING WINDS IN EXCESS OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HIGHWAY 14 SOUTHEAST OF WINONA THROUGH 5 PM...
  DODGE AND BLUFF SIDING AROUND 445 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...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 4410 9181 4414 9156 4405 9156 4404 9157
      4403 9156 4398 9156 4401 9174
TIME...MOT...LOC 2137Z 288DEG 10KT 4405 9165
WIND...HAIL 60MPH 1.75IN

$$

BAUMGARDT
639 
WWUS53 KARX 042148
SVSARX

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

MNC169-WIC011-042215-
/O.CON.KARX.SV.W.0094.000000T0000Z-120904T2215Z/
WINONA MN-BUFFALO WI-
448 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
BUFFALO AND CENTRAL WINONA COUNTIES UNTIL 515 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED GOLF BALL SIZE HAIL STOCKTON WITH 
THIS STORM AT AROUND 425 PM. SPOTTERS HAVE ALSO CONFIRMED QUARTER 
SIZE HAIL IN WINONA. 

BRIEF HEAVY RAIN WILL LEAD TO WATER ISSUES IN THE CITY OF WINONA AS 
IT WILL OVERWHELM STORM SEWERS. PONDING ON ROADS IS LIKELY THROUGH 
530 PM. 

AT 442 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
SEVERE THUNDERSTORM WAS LOCATED NEAR WINONA...MOVING EAST AT 20 MPH.
THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HIGHWAY 14 ALONG THE MISSISSIPPI RIVER THROUGH 515 PM...
  RURAL EXTREME SOUTHEASTERN BUFFALO COUNTY AT 500 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4414 9156 4405 9156 4404 9157 4403 9156
      4398 9156 4403 9174 4409 9177
TIME...MOT...LOC 2145Z 288DEG 10KT 4404 9161
WIND...HAIL 60MPH 1.00IN

$$

BAUMGARDT
016 
WWUS53 KARX 042204
SVSARX

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

MNC169-WIC011-042215-
/O.CON.KARX.SV.W.0094.000000T0000Z-120904T2215Z/
WINONA MN-BUFFALO WI-
504 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
SOUTHEASTERN BUFFALO AND CENTRAL WINONA COUNTIES UNTIL 515 PM CDT...

SPOTTERS IN WINONA REPORTED QUARTER SIZED HAIL AND VERY HEAVY RAIN 
AROUND 445 PM. THE STORM IS STILL PRODUCING HEAVY RAIN AND WILL HAVE 
A THREAT FOR COPIOUS DIME TO PEA SIZED HAIL THROUGH 515 PM. 

AT 456 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
SEVERE THUNDERSTORM WAS LOCATED NEAR MARSHLAND...OR NEAR 
WINONA...MOVING EAST AT 15 MPH. 

THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 515 PM. 
HOWEVER...A FLOOD ADVISORY IS IN EFFECT FOR CENTRAL WINONA...AND THE 
CITY OF WINONA THROUGH 7 PM. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4410 9169 4408 9156 4405 9156 4404 9157
      4402 9156 4400 9156 4398 9157 4404 9169
TIME...MOT...LOC 2200Z 288DEG 10KT 4403 9155
WIND...HAIL 60MPH 1.00IN

$$

BAUMGARDT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 4:39 AM CDTDense Fog AdvisoryARXAdams, Buffalo, Clark, Crawford, Grant, Jackson and 7 more4 hr
Sep 4, 5:17 PM CDTSevere Thunderstorm WarningARXVernon28 min
Sep 4, 5:41 PM CDTSevere Thunderstorm WarningARXClark64 min
Sep 4, 5:56 PM CDTSevere Thunderstorm WarningARXLa Crosse, Vernon64 min
Sep 4, 6:16 PM CDTSevere Thunderstorm WarningARXClark29 min
Sep 4, 6:37 PM CDTSevere Thunderstorm WarningARXCrawford, Grant38 min
Sep 4, 6:48 PM CDTSevere Thunderstorm WarningARXCrawford, Vernon57 min
Sep 4, 4:00 PM CDTSevere Thunderstorm WarningARXWinona30 min
Sep 4, 4:53 PM CDTAreal Flood AdvisoryARXWinona97 min
Sep 4, 5:29 PM CDTSevere Thunderstorm WarningARXHouston, Winona46 min
Sep 4, 5:38 PM CDTSevere Thunderstorm WarningARXFillmore28 min
Sep 4, 5:50 PM CDTSevere Thunderstorm WarningARXHouston40 min
Sep 4, 6:14 PM CDTSevere Thunderstorm WarningARXHouston46 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Severe Thunderstorm Warnings in Minnesota, 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.