Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 76, NWS Milwaukee, WI

July 31, 20125 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 31, 2012, 12:50 AM CDT for 5 counties in Wisconsin. It was in force for 40 min. 4 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 31, 2012, 12:50 AM CDT (05:50 UTC)
Expired: Jul 31, 2012, 1:30 AM CDT
In force: 40 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Milwaukee radar (KMKX), 31 km from the middle of the area, began a volume at 05:51 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
Jul 31, 12:57 AM CDT	TSTM WND DMG	6 Sw Muskego, WI	TREE DOWN AT BIG BEND ROAD AND N LAKE DRIVE. TIME ESTIMATED.
Jul 31, 12:57 AM CDT	HAIL 0.25	5 S Waukesha, WI
Jul 31, 1:05 AM CDT	TSTM WND DMG	5 Nnw Waterford, WI	A COUPLE LARGE TREES DOWN IN THE CALDWELL AREA AND IN THE TICHIGAN AREA WEST AND NORTH OF TICHIGAN LAKE. TIME IS ESTIMATED BASED ON RADAR.
Jul 31, 1:05 AM CDT	HAIL 0.5	4 Wnw Greendale, WI	ON HIGHWAY 43 NEAR 124TH ST. TIME ESTIMATED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 5.8 hours before the alert went out and 228 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: 693 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1937 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

430 
WUUS53 KMKX 310550
SVRMKX
WIC059-079-101-127-133-310630-
/O.NEW.KMKX.SV.W.0076.120731T0550Z-120731T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1250 AM CDT TUE JUL 31 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN KENOSHA COUNTY IN SOUTHEAST WISCONSIN...
  SOUTHERN MILWAUKEE COUNTY IN SOUTHEAST WISCONSIN...
  RACINE COUNTY IN SOUTHEAST WISCONSIN...
  NORTHEASTERN WALWORTH COUNTY IN SOUTHEAST WISCONSIN...
  SOUTHERN WAUKESHA COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 130 AM CDT

* AT 1249 AM 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 DOWNTOWN WAUKESHA TO EAST TROY TO 7 MILES SOUTH OF PALMYRA...
  AND MOVING SOUTHEAST AT 40 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY
  THESE DAMAGING WINDS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NEW BERLIN AND BIG BEND AROUND 1255 AM CDT.
  WIND LAKE...WATERFORD NORTH...ROCHESTER AND MUSKEGO AROUND 100 AM
  CDT.
  HALES CORNERS AND GREENDALE AROUND 105 AM CDT.
  FRANKLIN...BURLINGTON AIRPORT...EAGLE LAKE AND BROWNS LAKE AROUND
  110 AM CDT.
  OAK CREEK AND UNION GROVE AROUND 115 AM CDT.
  BOHNERS LAKE AROUND 120 AM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE ABELLS
CORNERS...HONEY CREEK...WATERFORD...NORTH CAPE...BURLINGTON...
FRANKLIN...SPRING PRAIRIE...SPRINGFIELD...KANSASVILLE AND
FRANKSVILLE.

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 4261 8797 4255 8835 4283 8871 4285 8861
      4284 8854 4286 8854 4286 8852 4287 8831
      4301 8823 4290 8784 4286 8783 4282 8780
TIME...MOT...LOC 0550Z 300DEG 35KT 4295 8823 4280 8836
          4277 8859
WIND...HAIL 60MPH 0.75IN

$$

DDV

2 follow-up statements

943 
WWUS53 KMKX 310605
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
105 AM CDT TUE JUL 31 2012

WIC059-079-101-127-133-310630-
/O.CON.KMKX.SV.W.0076.000000T0000Z-120731T0630Z/
MILWAUKEE WI-RACINE WI-WAUKESHA WI-WALWORTH WI-KENOSHA WI-
105 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
KENOSHA...NORTHEASTERN WALWORTH...SOUTHERN WAUKESHA...RACINE AND
SOUTHERN MILWAUKEE COUNTIES UNTIL 130 AM CDT...

AT 101 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM MUSKEGO TO ROCHESTER TO
ELKHORN...MOVING SOUTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  FRANKLIN...BURLINGTON AIRPORT...EAGLE LAKE AND BROWNS LAKE AROUND
  110 AM CDT.
  OAK CREEK AND UNION GROVE AROUND 115 AM CDT.
  BOHNERS LAKE AROUND 120 AM CDT.
  STURTEVANT AROUND 125 AM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE NORTH
CAPE...BURLINGTON...KANSASVILLE...CALEDONIA...SLADES CORNERS...
FRANKSVILLE AND NEW MUNSTER.

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 4261 8797 4255 8835 4283 8871 4285 8861
      4284 8854 4286 8854 4286 8852 4287 8831
      4301 8823 4290 8784 4286 8783 4282 8780
TIME...MOT...LOC 0605Z 300DEG 35KT 4287 8806 4272 8819
          4270 8842
WIND...HAIL 60MPH 1.00IN

$$

BROOKS

816 
WWUS53 KMKX 310619
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
119 AM CDT TUE JUL 31 2012

WIC059-079-101-127-133-310630-
/O.CON.KMKX.SV.W.0076.000000T0000Z-120731T0630Z/
MILWAUKEE WI-RACINE WI-WAUKESHA WI-WALWORTH WI-KENOSHA WI-
119 AM CDT TUE JUL 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
KENOSHA...EAST CENTRAL WALWORTH...SOUTHEASTERN WAUKESHA...RACINE AND
SOUTHERN MILWAUKEE COUNTIES UNTIL 130 AM CDT...

AT 115 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM OAK CREEK TO UNION GROVE TO
BOHNERS LAKE...MOVING SOUTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF EAST CENTRAL
WALWORTH...NORTHWESTERN KENOSHA...RACINE...SOUTHEASTERN WAUKESHA AND
SOUTHERN MILWAUKEE COUNTIES.

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 4261 8797 4255 8835 4271 8855 4281 8823
      4296 8807 4290 8784 4286 8783 4282 8780
TIME...MOT...LOC 0619Z 300DEG 35KT 4281 8790 4266 8803
          4263 8826
WIND...HAIL 60MPH 1.00IN

$$

BROOKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 10:16 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac	29 min
Jul 30, 11:05 PM CDT	Special Marine Warning	MKX		55 min
Jul 30, 11:53 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson	37 min
Jul 31, 12:05 AM CDT	Special Marine Warning	MKX		55 min
Jul 31, 12:23 AM CDT	Severe Thunderstorm Warning	MKX	Jefferson, Waukesha	37 min
Jul 31, 12:40 AM CDT	Special Marine Warning	MKX		110 min
Jul 31, 1:11 AM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine	34 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.