Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 94, NWS Milwaukee, WI

September 17, 2012Milwaukee County, Waukesha County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 17, 2012, 2:58 PM CDT for Milwaukee County, Waukesha County, Wisconsin. It was in force for 62 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: Sep 17, 2012, 2:58 PM CDT (19:58 UTC)
Expired: Sep 17, 2012, 4:00 PM CDT
In force: 62 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Milwaukee County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 46 km from the middle of the area, began a volume at 19:59 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 17, 3:20 PM CDT	HAIL 0.5	5 Se Waukesha, WI	1/2 INCH DIAMETER HAIL COVERING THE GROUND.
Sep 17, 3:30 PM CDT	TSTM WND GST 50	4 Sw Milwaukee, WI	ESTIMATED 40-50 MPH WIND WITH PEA SIZE HAIL AT STATE HWY 100 AND LINCOLN AVE.
Sep 17, 3:32 PM CDT	HAIL 0.75	Hales Corners, WI
Sep 17, 3:42 PM CDT	TSTM WND DMG	N Greenfield, WI	1 FOOT DIAMETER PINE TREE UPROOTED AND LAYING ACROSS ROAD NEAR 76TH ST AND HOWARD AVE. TIME OF EVENT ESTIMATED BASED ON RADAR. REPORT RECEIVED AT 440 PM.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.0 hours before the alert went out and 174 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: 162 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 991 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

074 
WUUS53 KMKX 171958
SVRMKX
WIC079-133-172100-
/O.NEW.KMKX.SV.W.0094.120917T1958Z-120917T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
258 PM CDT MON SEP 17 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MILWAUKEE COUNTY IN SOUTHEAST WISCONSIN...
  SOUTHERN WAUKESHA COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 400 PM CDT

* AT 254 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED
  NEAR NORTH PRAIRIE...OR NEAR MUKWONAGO...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MUKWONAGO...MUSKEGO...NEW BERLIN...HALES CORNERS...FRANKLIN...
  GREENDALE...GREENFIELD...WEST MILWAUKEE...OAK CREEK...SOUTH
  MILWAUKEE...ST. FRANCIS...CUDAHY...BIG BEND...MILWAUKEE
  INTERNATIONAL AIRPORT...MILWAUKEE HOAN BRIDGE...GENESEE...GENESEE
  DEPOT...MILWAUKEE SOUTH SHORE PARK AND SAINT FRANCIS.

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 4285 8783 4284 8815 4284 8846 4298 8852
      4300 8806 4303 8789 4301 8789 4296 8784
      4291 8783 4289 8785 4288 8783 4287 8783
TIME...MOT...LOC 1958Z 260DEG 27KT 4291 8837
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

6 follow-up statements

549 
WWUS53 KMKX 172005
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
305 PM CDT MON SEP 17 2012

WIC079-133-172100-
/O.CON.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-WAUKESHA WI-
305 PM CDT MON SEP 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WAUKESHA AND SOUTHERN MILWAUKEE COUNTIES UNTIL 400 PM CDT...

AT 303 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
MUKWONAGO...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MUSKEGO...NEW BERLIN...HALES CORNERS...FRANKLIN...GREENFIELD...
  GREENDALE...OAK CREEK...ST. FRANCIS...SOUTH MILWAUKEE...CUDAHY...
  BIG BEND...MILWAUKEE INTERNATIONAL AIRPORT...MILWAUKEE SOUTH SHORE
  PARK AND SAINT FRANCIS.

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 4285 8783 4284 8815 4284 8846 4298 8852
      4297 8830 4299 8789 4300 8788 4296 8784
      4291 8783 4289 8785 4288 8783
TIME...MOT...LOC 2006Z 266DEG 25KT 4291 8830
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

191 
WWUS53 KMKX 172015
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
315 PM CDT MON SEP 17 2012

WIC079-133-172100-
/O.CON.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-WAUKESHA WI-
315 PM CDT MON SEP 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WAUKESHA AND SOUTHERN MILWAUKEE COUNTIES UNTIL 400 PM CDT...

AT 313 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BIG
BEND...OR 6 MILES WEST OF MUSKEGO...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MUSKEGO...NEW BERLIN...HALES CORNERS...FRANKLIN...GREENFIELD...
  GREENDALE...OAK CREEK...ST. FRANCIS...SOUTH MILWAUKEE...CUDAHY...
  MILWAUKEE INTERNATIONAL AIRPORT...MILWAUKEE SOUTH SHORE PARK AND
  SAINT FRANCIS.

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 4285 8783 4284 8815 4284 8846 4298 8852
      4297 8830 4299 8789 4300 8788 4296 8784
      4291 8783 4289 8785 4288 8783
TIME...MOT...LOC 2015Z 266DEG 25KT 4291 8821
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

242 
WWUS53 KMKX 172028
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
328 PM CDT MON SEP 17 2012

WIC079-133-172100-
/O.CON.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-WAUKESHA WI-
328 PM CDT MON SEP 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
WAUKESHA AND SOUTHERN MILWAUKEE COUNTIES UNTIL 400 PM CDT...

AT 327 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
HALES CORNERS...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  GREENDALE...GREENFIELD...SOUTH MILWAUKEE...ST. FRANCIS...CUDAHY...
  MILWAUKEE INTERNATIONAL AIRPORT...MILWAUKEE SOUTH SHORE PARK AND
  SAINT FRANCIS.

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 4291 8787 4290 8795 4290 8809 4290 8814
      4298 8815 4299 8789 4300 8788 4296 8784
      4291 8783
TIME...MOT...LOC 2029Z 258DEG 32KT 4295 8805
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

688 
WWUS53 KMKX 172039
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
339 PM CDT MON SEP 17 2012

WIC133-172049-
/O.CAN.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
WAUKESHA WI-
339 PM CDT MON SEP 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WAUKESHA COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4293 8784 4294 8787 4293 8793 4292 8799
      4293 8803 4298 8803 4299 8801 4299 8789
      4300 8788 4296 8784
TIME...MOT...LOC 2039Z 255DEG 32KT 4298 8794

$$

WIC079-172100-
/O.CON.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-
339 PM CDT MON SEP 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
MILWAUKEE COUNTY UNTIL 400 PM CDT...

AT 336 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
GREENFIELD...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  CUDAHY...ST. FRANCIS...MILWAUKEE INTERNATIONAL AIRPORT...MILWAUKEE
  SOUTH SHORE PARK AND SAINT FRANCIS.

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 4293 8784 4294 8787 4293 8793 4292 8799
      4293 8803 4298 8803 4299 8801 4299 8789
      4300 8788 4296 8784
TIME...MOT...LOC 2039Z 255DEG 32KT 4298 8794
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

969 
WWUS53 KMKX 172045
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
345 PM CDT MON SEP 17 2012

WIC079-172100-
/O.CON.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-
345 PM CDT MON SEP 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
MILWAUKEE COUNTY UNTIL 400 PM CDT...

AT 341 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WEST
MILWAUKEE...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME EASTERN MILWAUKEE COUNTY.

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 4297 8785 4296 8792 4295 8795 4296 8797
      4298 8797 4299 8797 4299 8789 4300 8788
TIME...MOT...LOC 2046Z 255DEG 29KT 4299 8788
WIND...HAIL 60MPH 1.25IN

$$
COLLAR

446 
WWUS53 KMKX 172054
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
354 PM CDT MON SEP 17 2012

WIC079-172102-
/O.EXP.KMKX.SV.W.0094.000000T0000Z-120917T2100Z/
MILWAUKEE WI-
354 PM CDT MON SEP 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MILWAUKEE COUNTY HAS 
BEEN CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4297 8785 4296 8792 4295 8795 4296 8797
      4298 8797 4299 8797 4299 8789 4300 8788
TIME...MOT...LOC 2052Z 255DEG 29KT 4300 8782

$$
COLLAR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 3:46 AM CDT	Small Craft Advisory	MKX		42 hr
Sep 17, 2:55 PM CDT	Severe Thunderstorm Warning	MKX	Rock, Walworth	26 min
Sep 17, 3:06 PM CDT	Special Marine Warning	MKX		84 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.