Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 89, NWS Milwaukee, WI

September 4, 20126 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 8:35 PM CDT for 6 counties in Wisconsin. It was in force for 55 min. 7 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, 8:35 PM CDT (01:35 UTC)
Expired: Sep 4, 2012, 9:30 PM CDT
In force: 55 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

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

The radar

The Milwaukee radar (KMKX), 22 km from the middle of the area, began a volume at 01:38 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
Sep 4, 8:35 PM CDT	TSTM WND GST 65	Lowell, WI	LOSS OF POWER.
Sep 4, 8:55 PM CDT	HAIL 0.25	2 Nne Watertown, WI
Sep 4, 9:05 PM CDT	TSTM WND DMG	Eagle, WI	TREES DOWN IN SOUTHWEST WAUKESHA COUNTY. NEAR EAGLE AND OTTAWA. TIME ESTIMATED.
Sep 4, 9:14 PM CDT	TSTM WND DMG	Elkhorn, WI	TREES DOWN ACROSS THE COUNTY...MAINLY IN THE WESTERN HALF. TIME ESTIMATED.
Sep 4, 9:25 PM CDT	TSTM WND GST 36	East Troy, WI
Sep 4, 9:35 PM CDT	TSTM WND GST 41	Waukesha Airport, WI
Sep 4, 9:35 PM CDT	TSTM WND GST 45	Mukwonago, WI	ESTIMATED 40 TO 45 MPH GUSTS BETWEEN 930 AND 935 PM.

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
Sep 4, 3:27 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 1.6 hours before the alert went out and 180 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: 2450 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

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

588 
WUUS53 KMKX 050135
SVRMKX
WIC027-055-105-127-131-133-050230-
/O.NEW.KMKX.SV.W.0089.120905T0135Z-120905T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
835 PM CDT TUE SEP 4 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

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

* UNTIL 930 PM CDT

* AT 833 PM 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 BEAVER DAM TO LAKE MILLS
  TO BROOKLYN...AND MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  JUNEAU DODGE AIRPORT...WATERTOWN AIRPORT...WATERTOWN AND
  ORFORDVILLE AROUND 845 PM CDT.
  HORICON AROUND 850 PM CDT.
  MAYVILLE AND HUSTISFORD AROUND 855 PM CDT.
  THERESA...JANESVILLE AIRPORT AND IRON RIDGE AROUND 900 PM CDT.
  PALMYRA...OKAUCHEE LAKE...DOUSMAN AND BELOIT AROUND 905 PM CDT.
  LAPHAM PEAK STATE PARK AROUND 910 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
RICHWOOD...BURNETT...MINNESOTA JUNCTION...CLYMAN...PIPERSVILLE...
LEBANON...NEWARK...HANOVER...IXONIA AND SULLIVAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4250 8936 4263 8936 4267 8895 4297 8855
      4345 8901 4354 8900 4354 8826 4322 8813
      4285 8830 4249 8870
TIME...MOT...LOC 0135Z 289DEG 35KT 4348 8884 4303 8885
          4283 8930
WIND...HAIL 70MPH 1.00IN

$$

WOOD

3 follow-up statements

701 
WWUS53 KMKX 050147
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
847 PM CDT TUE SEP 4 2012

WIC027-055-105-127-131-133-050230-
/O.CON.KMKX.SV.W.0089.000000T0000Z-120905T0230Z/
DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-WASHINGTON WI-
847 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
WASHINGTON...SOUTHERN ROCK...WALWORTH...WAUKESHA...EASTERN JEFFERSON
AND DODGE COUNTIES UNTIL 930 PM CDT...

AT 843 PM 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 JUNEAU DODGE COUNTY AIRPORT TO 
JEFFERSON TO 5 MILES NORTH OF MILTON TO ALBANY...MOVING EAST AT 40 
MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  MAYVILLE...ORFORDVILLE AND HUSTISFORD AROUND 855 PM CDT.
  IRON RIDGE AROUND 900 PM CDT.
  THERESA AND PALMYRA AROUND 905 PM CDT.
  OKAUCHEE LAKE AND DOUSMAN AROUND 910 PM CDT.
  JANESVILLE AIRPORT...LAPHAM PEAK STATE PARK...WALES AND NORTH
  PRAIRIE AROUND 915 PM CDT.
  SLINGER...MUKWONAGO AND MERTON AROUND 920 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE LEBANON...
IXONIA...NWS SULLIVAN/MILWAUKEE...NEWARK...HANOVER...WOODLAND...
MONTEREY...ASHIPPUN...OCONOMOWOC AND NEOSHO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS IF YOU ARE IN
THE PATH OF THIS STORM. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4250 8936 4263 8936 4267 8895 4297 8855
      4345 8901 4354 8900 4354 8826 4322 8813
      4285 8830 4249 8870
TIME...MOT...LOC 0147Z 290DEG 33KT 4344 8870 4299 8872
          4284 8892 4272 8933
WIND...HAIL 70MPH 1.00IN

$$
MBK

653 
WWUS53 KMKX 050209
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
909 PM CDT TUE SEP 4 2012

WIC027-055-105-127-131-133-050230-
/O.CON.KMKX.SV.W.0089.000000T0000Z-120905T0230Z/
DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-WASHINGTON WI-
909 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN
WASHINGTON...SOUTHERN ROCK...WALWORTH...WAUKESHA...EASTERN JEFFERSON
AND DODGE COUNTIES UNTIL 930 PM CDT...

AT 906 PM 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 IRON RIDGE TO 5 MILES WEST OF
NORTH PRAIRIE TO 8 MILES NORTH OF DARIEN TO JANESVILLE AIRPORT...
MOVING EAST AT 45 MPH.

IN ADDITION...AT 853 PM CDT...AN OBSERVER IN FORT ATKINSON REPORTED 
ESTIMATED WIND GUSTS TO 60 MPH WITH THESE STORMS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  LAPHAM PEAK STATE PARK...WALES...NORTH PRAIRIE AND HARTLAND AROUND
  915 PM CDT.
  SLINGER...POTTER LAKE...MUKWONAGO AND MERTON AROUND 920 PM CDT.
  WAUKESHA AIRPORT...DOWNTOWN WAUKESHA...SUSSEX AND PEWAUKEE AROUND
  925 PM CDT.
  SHARON AND DELAVAN LAKE AROUND 930 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE ALLENTON...
SAINT LAWRENCE...TROY CENTER...NORTH LAKE...GENESEE...GENESEE
DEPOT...EMERALD GROVE...AVALON...ABELLS CORNERS AND HOLY HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4250 8936 4263 8936 4267 8895 4297 8855
      4345 8901 4354 8899 4354 8826 4322 8813
      4284 8831 4249 8870
TIME...MOT...LOC 0208Z 290DEG 38KT 4337 8844 4292 8847
          4271 8866 4265 8908
WIND...HAIL 70MPH 1.00IN

$$
MBK

413 
WWUS53 KMKX 050224
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
924 PM CDT TUE SEP 4 2012

WIC027-055-105-127-131-133-050234-
/O.EXP.KMKX.SV.W.0089.000000T0000Z-120905T0230Z/
DODGE WI-JEFFERSON WI-WAUKESHA WI-WALWORTH WI-ROCK WI-WASHINGTON WI-
924 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN WASHINGTON...SOUTHERN
ROCK...WALWORTH...WAUKESHA...EASTERN JEFFERSON AND DODGE COUNTIES
WILL EXPIRE AT 930 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE
WARNED AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 PM CDT. 

LAT...LON 4250 8936 4263 8936 4267 8895 4297 8855
      4345 8901 4354 8899 4354 8826 4322 8813
      4284 8831 4249 8870
TIME...MOT...LOC 0224Z 290DEG 38KT 4331 8822 4286 8825
          4265 8844 4259 8886

$$

MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 7:20 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Sauk	55 min
Sep 4, 7:46 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Sauk	59 min
Sep 4, 7:48 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Sauk	42 min
Sep 4, 8:12 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Dodge, Green, Jefferson, Rock	63 min
Sep 4, 8:16 PM CDT	Severe Thunderstorm Warning	MKX	Green, Iowa, Lafayette	59 min
Sep 4, 8:45 PM CDT	Special Marine Warning	MKX		2 hr
Sep 4, 9:07 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington and 1 more	83 min
Sep 4, 9:57 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Sheboygan	34 min
Sep 4, 10:01 PM CDT	Special Marine Warning	MKX		65 min
Sep 4, 10:45 PM CDT	Special Marine Warning	MKX		45 min
Sep 5, 3:05 AM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	55 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.