Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 66, NWS Milwaukee, WI

July 26, 20126 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 26, 2012, 12:35 AM CDT for 6 counties in Wisconsin. It was in force for 70 min. 9 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 26, 2012, 12:35 AM CDT (05:35 UTC)
Expired
Jul 26, 2012, 1:45 AM CDT
In force
70 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Columbia County, WI, Dodge County, WI, Jefferson County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 25 km from the middle of the area, began a volume at 05:37 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 26, 1:16 AM CDTTSTM WND DMG1 S Fort Atkinson, WITREE BRANCH SIX TO EIGHT INCHES IN DIAMETER DOWN. TIME ESTIMATED.
Jul 26, 1:16 AM CDTTSTM WND DMGFort Atkinson, WISEVERAL TREES DOWN ACROSS FORT ATKINSON. TIME ESTIMATED.
Jul 26, 1:20 AM CDTTSTM WND GST 61Whitewater, WIWWATR MESONET
Jul 26, 1:28 AM CDTTSTM WND DMG2 S Palmyra, WITREE BRANCHES 1 FOOT IN DIAMETER ACROSS ROAD.
Jul 26, 1:30 AM CDTTSTM WND DMG2 N Palmyra, WI10 INCH DIAMETER TREE DOWN ON COUNTY ROAD E.
Jul 26, 1:30 AM CDTTSTM WND DMG4 Sw Oconomowoc, WITRAMPOLINE SLAMS INTO FRONT DOOR AND BREAKS WINDOW.
Jul 26, 1:36 AM CDTTSTM WND GST 51Nws Sullivan/Milwaukee, WI
Jul 26, 1:39 AM CDTTSTM WND GST 63Palmyra, WI
Jul 26, 1:40 AM CDTTSTM WND DMG3 Nne Sullivan, WISEVERAL TREES DOWN. TIME ESTIMATED.

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 25, 6:38 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 5.6 hours before the alert went out and 167 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, Green Bay/Straub, WI at 00:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2643 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, Green Bay/Straub, WI at 00:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 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
2643 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1451 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
212 m²/s²
Significant tornado parameter
1.2
Supercell composite
16.9

Open this sounding in Storm Lab

The text

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

146 
WUUS53 KMKX 260535
SVRMKX
WIC021-027-055-105-127-133-260645-
/O.NEW.KMKX.SV.W.0066.120726T0535Z-120726T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1235 AM CDT THU JUL 26 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EASTERN COLUMBIA COUNTY IN SOUTH CENTRAL WISCONSIN...
  DODGE COUNTY IN SOUTHEAST WISCONSIN...
  JEFFERSON COUNTY IN SOUTHEAST WISCONSIN...
  EASTERN ROCK COUNTY IN SOUTH CENTRAL WISCONSIN...
  WESTERN WALWORTH COUNTY IN SOUTHEAST WISCONSIN...
  EXTREME WESTERN WAUKESHA COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 145 AM CDT

* AT 1232 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 9 MILES SOUTH OF MONTELLO
  TO LAKE SUMMERSET...AND MOVING EAST AT 35 MPH.

  AT 1202 AM CDT A 63 MPH WIND GUST WAS REPORTED AT LONE ROCK AIRPORT
  WITH THESE STORMS.

* LOCATIONS IMPACTED INCLUDE...
  WATERLOO...MILTON...LAKE MILLS...FORT ATKINSON...BEAVER DAM...
  JEFFERSON...WHITEWATER...WAUPUN...WATERTOWN...JUNEAU...HORICON...
  DELAVAN LAKE...MAYVILLE...RANDOLPH...LAKE RIPLEY...CLINTON...
  JOHNSON CREEK...WATERTOWN AIRPORT...DARIEN AND JUNEAU DODGE
  AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS!

THIS IS AN EXTREMELY DANGEROUS SITUATION WITH TORNADO LIKE WIND
SPEEDS EXPECTED. MOBILE HOMES AND HIGH PROFILE VEHICLES ARE
ESPECIALLY SUSCEPTIBLE TO WINDS OF THIS MAGNITUDE AND MAY BE
OVERTURNED. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. THESE STORMS HAVE THE
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 4251 8901 4328 8901 4328 8902 4363 8902
      4363 8846 4321 8851 4251 8855
TIME...MOT...LOC 0534Z 259DEG 30KT 4367 8936 4249 8933
WIND...HAIL 70MPH 1.00IN

$$

REM
3 follow-up statements
749 
WWUS53 KMKX 260611
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
111 AM CDT THU JUL 26 2012

WIC021-027-055-105-127-133-260645-
/O.CON.KMKX.SV.W.0066.000000T0000Z-120726T0645Z/
COLUMBIA WI-DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-
111 AM CDT THU JUL 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
ROCK...WESTERN WALWORTH...EXTREME WESTERN WAUKESHA...JEFFERSON...
DODGE AND EXTREME EASTERN COLUMBIA COUNTIES UNTIL 145 AM CDT...

AT 100 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM RANDOLPH TO CAMBRIDGE TO SHARON...MOVING EAST AT 35
MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  LAKE MILLS...BEAVER DAM...DELAVAN LAKE...FORT ATKINSON...
  WHITEWATER...JEFFERSON...JUNEAU...WATERTOWN...HORICON...MAYVILLE...
  WALWORTH...FONTANA-ON-GENEVA LAKE...JOHNSON CREEK...JUNEAU DODGE
  AIRPORT...WATERTOWN AIRPORT...PALMYRA...HUSTISFORD...IRON RIDGE...
  FOX LAKE AND SOUTH BEAVER DAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING WINDS FROM 50 TO 64 MPH WITH 
HIGHER WIND SPEEDS EXPECTED. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4251 8901 4328 8901 4328 8902 4363 8902
      4363 8846 4321 8851 4251 8855
TIME...MOT...LOC 0610Z 259DEG 30KT 4351 8890 4300 8899
          4253 8866
WIND...HAIL 70MPH 0.75IN

$$

GEHRING
214 
WWUS53 KMKX 260632
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
132 AM CDT THU JUL 26 2012

WIC021-027-055-105-127-133-260645-
/O.CON.KMKX.SV.W.0066.000000T0000Z-120726T0645Z/
COLUMBIA WI-DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-
132 AM CDT THU JUL 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
ROCK...WESTERN WALWORTH...EXTREME WESTERN WAUKESHA...JEFFERSON...
DODGE AND EXTREME EASTERN COLUMBIA COUNTIES UNTIL 145 AM CDT...

AT 123 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM MAYVILLE TO JEFFERSON TO WILLIAMS BAY...MOVING EAST AT
35 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
  PALMYRA...WOODLAND...KNOWLES...IXONIA...ROME...NEOSHO...
  BROWNSVILLE...ASHIPPUN...SULLIVAN...NWS SULLIVAN/MILWAUKEE AND LAC
  LA BELLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING WINDS OF 50 TO 64 MPH OVER 
SOUTH CENTRAL WISCONSIN. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE 
AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4251 8901 4328 8901 4328 8902 4363 8902
      4363 8846 4321 8851 4251 8855
TIME...MOT...LOC 0631Z 259DEG 30KT 4347 8848 4301 8866
          4256 8843
WIND...HAIL 70MPH 0.75IN

$$

GEHRING
928 
WWUS53 KMKX 260641
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
141 AM CDT THU JUL 26 2012

WIC021-027-055-105-127-133-260651-
/O.EXP.KMKX.SV.W.0066.000000T0000Z-120726T0645Z/
COLUMBIA WI-DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-
141 AM CDT THU JUL 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ROCK...WESTERN
WALWORTH...EXTREME WESTERN WAUKESHA...JEFFERSON...DODGE AND EXTREME
EASTERN COLUMBIA COUNTIES WILL EXPIRE AT 145 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED TO THE EAST. 

LAT...LON 4251 8901 4328 8901 4328 8902 4363 8902
      4363 8846 4321 8851 4251 8855
TIME...MOT...LOC 0641Z 259DEG 30KT 4348 8836 4302 8855
          4257 8832

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 8:26 PM CDTSpecial Marine WarningMKX64 min
Jul 25, 9:34 PM CDTSevere Thunderstorm WarningMKXIowa26 min
Jul 25, 9:51 PM CDTSevere Thunderstorm WarningMKXIowa, Lafayette32 min
Jul 25, 11:20 PM CDTSevere Thunderstorm WarningMKXIowa, Lafayette40 min
Jul 25, 11:39 PM CDTSevere Thunderstorm WarningMKXLafayette51 min
Jul 25, 11:39 PM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac, Washington21 min
Jul 25, 11:52 PM CDTSevere Thunderstorm WarningMKXIowa, Lafayette, Sauk38 min
Jul 26, 12:00 AM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac30 min
Jul 26, 12:10 AM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Green, Rock35 min
Jul 26, 12:41 AM CDTSevere Thunderstorm WarningMKXFond du Lac49 min
Jul 26, 12:53 AM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Green, Rock37 min
Jul 26, 1:13 AM CDTSevere Thunderstorm WarningMKXFond du Lac, Sheboygan32 min
Jul 26, 1:24 AM CDTSpecial Marine WarningMKX96 min
Jul 26, 1:26 AM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac, Kenosha, Milwaukee, Ozaukee, Racine and 4 more64 min
Jul 26, 2:20 PM CDTSpecial Marine WarningMKX85 min
Jul 26, 2:47 PM CDTSevere Thunderstorm WarningMKXSheboygan28 min
Jul 26, 2:56 PM CDTSevere Thunderstorm WarningMKXOzaukee, Washington34 min
Jul 26, 3:03 PM CDTSpecial Marine WarningMKX72 min
Jul 26, 3:38 PM CDTSpecial Marine WarningMKX2 hr
Jul 26, 3:46 PM CDTSpecial Marine WarningMKX44 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.