Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 85, NWS Milwaukee, WI

September 4, 2012Dane County, Iowa County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 7:46 PM CDT for Dane County, Iowa County, Sauk County, Wisconsin. It was in force for 59 min. 2 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, 7:46 PM CDT (00:46 UTC)
Expired: Sep 4, 2012, 8:45 PM CDT
In force: 59 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Dane County, WI, Iowa County, WI, Sauk County, WI

The radar

The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 00:47 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, 7:56 PM CDT	TSTM WND DMG	Dodgeville, WI	TREES AND POWERLINES DOWN ACROSS THE COUNTY...MAINLY IN DODGEVILLE...EDMUND...AND LINDEN. TIME ESTIMATED.
Sep 4, 8:11 PM CDT	TSTM WND GST 59	Mineral Point 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

Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 171 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: 1890 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1662 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 44 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.

163 
WUUS53 KMKX 050046
SVRMKX
WIC025-049-111-050145-
/O.NEW.KMKX.SV.W.0085.120905T0046Z-120905T0145Z/

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN DANE COUNTY IN SOUTH CENTRAL WISCONSIN...
  IOWA COUNTY IN SOUTH CENTRAL WISCONSIN...
  SOUTHERN SAUK COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 845 PM CDT

* AT 742 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTHWEST OF LONE ROCK AIRPORT...OR 14 MILES SOUTHEAST OF RICHLAND
  CENTER...AND MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GOVERNOR DODGE STATE PARK AND MINERAL POINT AIRPORT AROUND 800 PM
  CDT.
  SPRING GREEN AND DODGEVILLE AROUND 805 PM CDT.
  BLUE MOUND STATE PARK...MAZOMANIE...SAUK CITY AND PRAIRIE DU SAC
  AROUND 835 PM CDT.
  BLACK EARTH AROUND 840 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE ARENA...
BARNEVELD...BLUE MOUND ST PARK AND BLUE MOUNDS.

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 4320 9044 4321 9029 4317 9020 4332 9019
      4329 8960 4281 8985 4292 9043
TIME...MOT...LOC 0046Z 286DEG 23KT 4315 9024
WIND...HAIL 60MPH 1.00IN

$$

WOOD

3 follow-up statements

638 
WWUS53 KMKX 050100
SVSMKX

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

WIC025-049-111-050145-
/O.CON.KMKX.SV.W.0085.000000T0000Z-120905T0145Z/
DANE WI-IOWA WI-SAUK WI-
800 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
SAUK...IOWA AND WESTERN DANE COUNTIES UNTIL 845 PM CDT...

AT 756 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 6
MILES SOUTH OF LONE ROCK AIRPORT...OR 12 MILES NORTHWEST OF
DODGEVILLE...MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SPRING GREEN AROUND 810 PM CDT.
  GOVERNOR DODGE STATE PARK AND MINERAL POINT AIRPORT AROUND 820 PM
  CDT.
  DODGEVILLE AROUND 825 PM CDT.
  BLUE MOUND STATE PARK...SAUK CITY AND PRAIRIE DU SAC AROUND 845 PM
  CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE GOVERNOR
DODGE ST PARK...RIDGEWAY...BARNEVELD...BLUE MOUND ST PARK AND BLUE
MOUNDS.

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 4320 9044 4321 9029 4317 9020 4332 9019
      4329 8960 4281 8985 4292 9043
TIME...MOT...LOC 0059Z 299DEG 19KT 4312 9021
WIND...HAIL 70MPH 1.00IN

$$
MBK

422 
WWUS53 KMKX 050121
SVSMKX

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

WIC025-049-111-050145-
/O.CON.KMKX.SV.W.0085.000000T0000Z-120905T0145Z/
DANE WI-IOWA WI-SAUK WI-
821 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
SAUK...IOWA AND WESTERN DANE COUNTIES UNTIL 845 PM CDT...

AT 819 PM 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 BLUE MOUND STATE PARK TO 6 MILES
EAST OF DODGEVILLE TO MINERAL POINT AIRPORT...MOVING SOUTHEAST AT 25
MPH.

SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF IOWA...SOUTH
CENTRAL SAUK AND WESTERN DANE COUNTIES...INCLUDING THE FOLLOWING
LOCATIONS BLUE MOUNDS AND HOLLANDALE.

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 4311 9040 4315 9031 4314 9018 4323 9007
      4329 8961 4281 8985 4292 9043
TIME...MOT...LOC 0121Z 299DEG 24KT 4309 8984 4293 9000
          4288 9031
WIND...HAIL 60MPH 1.00IN

$$

MBK

066 
WWUS53 KMKX 050142
SVSMKX

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

WIC025-049-111-050152-
/O.EXP.KMKX.SV.W.0085.000000T0000Z-120905T0145Z/
DANE WI-IOWA WI-SAUK WI-
842 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAUK...IOWA AND
WESTERN DANE COUNTIES WILL EXPIRE AT 845 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 4311 9040 4315 9031 4314 9018 4323 9007
      4329 8961 4281 8985 4292 9043
TIME...MOT...LOC 0142Z 299DEG 24KT 4302 8967 4286 8983
          4281 9014

$$

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, 7:48 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, 9:07 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.