Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 90, NWS Milwaukee, WI

September 4, 20127 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 9:07 PM CDT for 7 counties in Wisconsin. It was in force for 83 min. 13 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, 9:07 PM CDT (02:07 UTC)
Expired: Sep 4, 2012, 10:30 PM CDT
In force: 83 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 47 km from the middle of the area, began a volume at 02:11 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, 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, 9:29 PM CDT	TSTM WND DMG	Waterford, WI	TREES AND POWERLINES DOWN IN WATERFORD...TICHIGAN...AND BURLINGTON. TIME ESTIMATED.
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.
Sep 4, 9:35 PM CDT	TSTM WND GST 46	Burlington Airport, WI
Sep 4, 9:39 PM CDT	TSTM WND DMG	4 Wnw Paddock Lake, WI	TREE DOWN IN WHEATLAND. TIME ESTIMATED.
Sep 4, 9:42 PM CDT	TSTM WND DMG	2 E Waubeka, WI	TREE AND SEVERAL BRANCHES DOWN IN FREDONIA.
Sep 4, 9:43 PM CDT	TSTM WND GST 40	1 S Waukesha, WI	ESTIMATED 35 TO 40 MPH WIND GUSTS AND ABOUT 1 BLOCK VISIBILITY.
Sep 4, 9:48 PM CDT	TSTM WND DMG	6 Wnw Kenosha Airport, WI	TREE DOWN IN PARIS AT 156TH BLOCK OF HWY N. TIME ESTIMATED.
Sep 4, 9:52 PM CDT	TSTM WND DMG	Bristol, WI	LARGE TREE DOWN ON 209 AND HIGHWAY V. TIME ESTIMATED.
Sep 4, 10:01 PM CDT	TSTM WND GST 45	Milwaukee, WI	ESTIMATED 45 MPH GUST AT UW MILWAUKEE CAMPUS.
Sep 4, 10:02 PM CDT	TSTM WND GST 44	Kenosha Airport, WI

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, 2.1 hours before the alert went out and 162 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.

487 
WUUS53 KMKX 050207
SVRMKX
WIC059-079-089-101-127-131-133-050330-
/O.NEW.KMKX.SV.W.0090.120905T0207Z-120905T0330Z/

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KENOSHA COUNTY IN SOUTHEAST WISCONSIN...
  MILWAUKEE COUNTY IN SOUTHEAST WISCONSIN...
  OZAUKEE COUNTY IN SOUTHEAST WISCONSIN...
  RACINE COUNTY IN SOUTHEAST WISCONSIN...
  WALWORTH COUNTY IN SOUTHEAST WISCONSIN...
  WASHINGTON COUNTY IN SOUTHEAST WISCONSIN...
  WAUKESHA COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 1030 PM CDT

* AT 901 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 MAYVILLE TO DOUSMAN TO 7
  MILES NORTH OF CLINTON...AND MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SHARON...NORTH PRAIRIE AND HARTLAND AROUND 915 PM CDT.
  MERTON AND DELAVAN LAKE AROUND 920 PM CDT.
  WAUKESHA AIRPORT...DOWNTOWN WAUKESHA...WALWORTH AND SLINGER AROUND
  925 PM CDT.
  WILLIAMS BAY...SUSSEX...POTTER LAKE AND FONTANA-ON-GENEVA LAKE
  AROUND 930 PM CDT.
  KEWASKUM AND WEST BEND AROUND 935 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE TROY
CENTER...SAINT LAWRENCE...GENESEE...GENESEE DEPOT...ALLENTON...
ADDISON...ABELLS CORNERS...HOLY HILL...DELAVAN AND WAYNE.

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 4265 8781 4249 8781 4249 8878 4285 8847
      4322 8833 4354 8840 4353 8779 4349 8779
      4338 8787 4324 8791 4318 8788 4312 8789
      4308 8786 4301 8789 4296 8784 4286 8783
      4278 8774
TIME...MOT...LOC 0206Z 278DEG 30KT 4354 8854 4301 8845
          4265 8879
WIND...HAIL 70MPH 1.00IN

$$

WOOD

4 follow-up statements

750 
WWUS53 KMKX 050220
SVSMKX

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

WIC059-079-089-101-127-131-133-050330-
/O.CON.KMKX.SV.W.0090.000000T0000Z-120905T0330Z/
MILWAUKEE WI-OZAUKEE WI-RACINE WI-WAUKESHA WI-WALWORTH WI-KENOSHA WI-
WASHINGTON WI-
920 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WASHINGTON...
KENOSHA...WALWORTH...WAUKESHA...RACINE...OZAUKEE AND MILWAUKEE
COUNTIES UNTIL 1030 PM CDT...

AT 915 PM 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 THERESA TO WALES TO DARIEN...MOVING EAST AT 35 MPH.
NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WAUKESHA AIRPORT...DOWNTOWN WAUKESHA...WALWORTH AND SLINGER AROUND
  925 PM CDT.
  WILLIAMS BAY...SUSSEX...POTTER LAKE AND COMO AROUND 930 PM CDT.
  KEWASKUM...WEST BEND...NEW BERLIN AND MENOMONEE FALLS AROUND 935 PM
  CDT.
  WEST BEND AIRPORT...BURLINGTON AIRPORT AND WATERFORD NORTH AROUND
  940 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE WAYNE...
KOHLSVILLE...FONTANA...HUBERTUS...COLGATE...SPRING PRAIRIE...
SPRINGFIELD...RICHFIELD...HONEY CREEK AND BEAR VALLEY.

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 4265 8781 4249 8781 4249 8878 4285 8847
      4322 8833 4354 8840 4353 8779 4349 8779
      4338 8787 4324 8791 4318 8788 4312 8789
      4308 8786 4301 8789 4296 8784 4286 8783
      4278 8774
TIME...MOT...LOC 0220Z 278DEG 30KT 4352 8838 4299 8829
          4263 8863
WIND...HAIL 70MPH 0.88IN

$$

MBK

253 
WWUS53 KMKX 050259
SVSMKX

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

WIC059-079-089-101-127-131-133-050330-
/O.CON.KMKX.SV.W.0090.000000T0000Z-120905T0330Z/
MILWAUKEE WI-OZAUKEE WI-RACINE WI-WAUKESHA WI-WALWORTH WI-KENOSHA WI-
WASHINGTON WI-
959 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
WASHINGTON...KENOSHA...EASTERN WALWORTH...EASTERN WAUKESHA...
RACINE...OZAUKEE AND MILWAUKEE COUNTIES UNTIL 1030 PM CDT...

AT 953 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM WEST BEND AIRPORT TO GREENFIELD TO BOHNERS LAKE...MOVING EAST AT
35 MPH. NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SAUKVILLE...FREDONIA...MILWAUKEE HOAN BRIDGE AND UW-MILWAUKEE
  CAMPUS AROUND 1005 PM CDT.
  BELGIUM AROUND 1010 PM CDT.
  HARRINGTON BEACH STATE PARK AND STURTEVANT AROUND 1015 PM CDT.
  RACINE BATTEN AIRPORT...KENOSHA AIRPORT...PLEASANT PRAIRIE AND WIND
  POINT AROUND 1020 PM CDT.
  DOWNTOWN RACINE AROUND 1025 PM CDT.
  DOWNTOWN KENOSHA AROUND 1030 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE SALEM...
SAINT FRANCIS...MILWAUKEE SOUTH SHORE PARK...MILWAUKEE BRADFORD
BEACH...UW-MILWAUKEE...SHOREWOOD...FRANKSVILLE...CALEDONIA...BRISTOL
AND NORTH BAY.

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 4265 8781 4249 8781 4250 8875 4281 8833
      4320 8820 4354 8817 4353 8779 4349 8779
      4338 8787 4324 8791 4318 8788 4312 8789
      4308 8786 4301 8789 4296 8784 4286 8783
      4278 8774
TIME...MOT...LOC 0259Z 278DEG 30KT 4336 8802 4296 8793
          4259 8819
WIND...HAIL 60MPH 0.88IN

$$

DAVIS

056 
WWUS53 KMKX 050319
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1019 PM CDT TUE SEP 4 2012

WIC127-131-133-050329-
/O.CAN.KMKX.SV.W.0090.000000T0000Z-120905T0330Z/
WAUKESHA WI-WALWORTH WI-WASHINGTON WI-
1019 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN WASHINGTON...EASTERN
WALWORTH AND EASTERN WAUKESHA COUNTIES IS CANCELLED...

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

LAT...LON 4265 8781 4249 8781 4249 8830 4279 8809
      4344 8796 4346 8781 4338 8787 4324 8791
      4318 8788 4312 8789 4308 8786 4301 8789
      4296 8784 4286 8783 4278 8774
TIME...MOT...LOC 0319Z 278DEG 30KT 4334 8779 4294 8770
          4257 8797

$$

WIC059-079-089-101-050330-
/O.CON.KMKX.SV.W.0090.000000T0000Z-120905T0330Z/
MILWAUKEE WI-OZAUKEE WI-RACINE WI-KENOSHA WI-
1019 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR KENOSHA...
EASTERN RACINE...SOUTHEASTERN OZAUKEE AND MILWAUKEE COUNTIES UNTIL
1030 PM CDT...

AT 1016 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM PORT WASHINGTON TO 6 MILES EAST OF CUDAHY TO PLEASANT PRAIRIE...
MOVING EAST AT 35 MPH. NICKEL SIZE HAIL MAY ALSO ACCOMPANY THESE
DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  DOWNTOWN RACINE AROUND 1025 PM CDT.
  DOWNTOWN KENOSHA AROUND 1030 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE NORTH BAY
AND ELMWOOD PARK.

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 4265 8781 4249 8781 4249 8830 4279 8809
      4344 8796 4346 8781 4338 8787 4324 8791
      4318 8788 4312 8789 4308 8786 4301 8789
      4296 8784 4286 8783 4278 8774
TIME...MOT...LOC 0319Z 278DEG 30KT 4334 8779 4294 8770
          4257 8797
WIND...HAIL 60MPH 0.88IN

$$
DAVIS

967 
WWUS53 KMKX 050328
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1028 PM CDT TUE SEP 4 2012

WIC059-079-089-101-050338-
/O.EXP.KMKX.SV.W.0090.000000T0000Z-120905T0330Z/
MILWAUKEE WI-OZAUKEE WI-RACINE WI-KENOSHA WI-
1028 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR KENOSHA...EASTERN RACINE...
SOUTHEASTERN OZAUKEE AND MILWAUKEE COUNTIES WILL EXPIRE AT 1030 PM
CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.

LAT...LON 4265 8781 4249 8781 4249 8830 4279 8809
      4344 8796 4346 8781 4338 8787 4324 8791
      4318 8788 4312 8789 4308 8786 4301 8789
      4296 8784 4286 8783 4278 8774
TIME...MOT...LOC 0328Z 279DEG 32KT 4329 8751 4289 8743
          4252 8770

$$

WOOD

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, 8:35 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Jefferson, Rock, Walworth, Washington, Waukesha	55 min
Sep 4, 8:45 PM CDT	Special Marine Warning	MKX		2 hr
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.