Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 84, NWS Milwaukee, WI

September 4, 2012Iowa County, Sauk County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 7:20 PM CDT for Iowa County, Sauk County, Wisconsin. It was in force for 55 min. 1 report 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, 7:20 PM CDT (00:20 UTC)
Expired: Sep 4, 2012, 8:15 PM CDT
In force: 55 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Iowa County, WI, Sauk County, WI

The radar

The La Crosse radar (KARX), 107 km from the middle of the area, began a volume at 00:24 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, 7:41 PM CDT	TSTM WND GST 55	Lone Rock 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, 0.3 hours before the alert went out and 191 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.

625 
WUUS53 KMKX 050020
SVRMKX
WIC049-111-050115-
/O.NEW.KMKX.SV.W.0084.120905T0020Z-120905T0115Z/

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

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

* UNTIL 815 PM CDT

* AT 715 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE HAIL UP TO HEN
  EGG SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED 7 MILES NORTH OF RICHLAND CENTER...AND MOVING EAST AT 30
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LONE ROCK AIRPORT AROUND 745 PM CDT.
  SPRING GREEN AROUND 800 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE LIME
RIDGE...HILL POINT...LOGANVILLE...PLAIN AND LELAND.

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 4351 9020 4348 8976 4310 8987 4310 9015
      4317 9020
TIME...MOT...LOC 0020Z 285DEG 26KT 4342 9038
WIND...HAIL 60MPH 2.00IN

$$

WOOD

5 follow-up statements

272 
WWUS53 KMKX 050033
SVSMKX

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

WIC049-111-050115-
/O.CON.KMKX.SV.W.0084.000000T0000Z-120905T0115Z/
IOWA WI-SAUK WI-
733 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN SAUK
AND NORTHEASTERN IOWA COUNTIES UNTIL 815 PM CDT...

AT 728 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING WALNUT SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 12 MILES
SOUTHWEST OF REEDSBURG...MOVING EAST AT 55 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WEST BARABOO AROUND 750 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE LELAND
AND NORTH FREEDOM.

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 4351 9020 4348 8976 4310 8987 4310 9015
      4317 9020
TIME...MOT...LOC 0033Z 278DEG 47KT 4340 9007
WIND...HAIL 60MPH 1.50IN

$$

MBK

599 
WWUS53 KMKX 050046
SVSMKX

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

WIC049-111-050115-
/O.CON.KMKX.SV.W.0084.000000T0000Z-120905T0115Z/
IOWA WI-SAUK WI-
746 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN SAUK
AND NORTHEASTERN IOWA COUNTIES UNTIL 815 PM CDT...

AT 742 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WALNUT SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM DEVILS LAKE STATE PARK TO 6 MILES NORTH
OF BLACKHAWK LAKE RECREATION AREA...MOVING EAST AT 65 MPH.

THE AIRPORT IN LONE ROCK REPORTED A 55 MPH WIND GUST AT 742 PM.  

SEVERE THUNDERSTORMS WILL BE NEAR...
  SPRING GREEN AROUND 750 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE ARENA.

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 4351 9020 4348 8976 4310 8987 4310 9015
      4317 9020
TIME...MOT...LOC 0044Z 272DEG 55KT 4344 8969 4310 9032
WIND...HAIL 60MPH 1.50IN

$$
MBK

758 
WWUS53 KMKX 050057
SVSMKX

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

WIC049-111-050115-
/O.CON.KMKX.SV.W.0084.000000T0000Z-120905T0115Z/
IOWA WI-SAUK WI-
757 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN SAUK
AND NORTHEASTERN IOWA COUNTIES UNTIL 815 PM CDT...

AT 751 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM DEVILS LAKE STATE PARK TO 6 MILES
NORTHEAST OF BLACKHAWK LAKE RECREATION AREA...MOVING EAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF NORTHEASTERN
IOWA AND SOUTHERN SAUK COUNTIES...INCLUDING THE FOLLOWING LOCATIONS
ARENA.

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 4351 9020 4348 8976 4310 8987 4310 9015
      4317 9020
TIME...MOT...LOC 0056Z 272DEG 55KT 4343 8958 4309 9022
WIND...HAIL 70MPH 1.25IN

$$
MBK

925 
WWUS53 KMKX 050107
SVSMKX

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

WIC049-111-050115-
/O.CON.KMKX.SV.W.0084.000000T0000Z-120905T0115Z/
IOWA WI-SAUK WI-
807 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL
SAUK AND NORTHEASTERN IOWA COUNTIES UNTIL 815 PM CDT...

AT 805 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM POYNETTE TO 6 MILES SOUTHEAST OF
SPRING GREEN...MOVING EAST AT 65 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHEASTERN IOWA COUNTY.

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 4331 9000 4330 8989 4331 8982 4321 8984
      4310 8987 4310 9014 4315 9018 4316 9019
TIME...MOT...LOC 0107Z 269DEG 55KT 4344 8933 4310 8997
WIND...HAIL 70MPH 1.25IN

$$
MBK

432 
WWUS53 KMKX 050114
SVSMKX

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

WIC049-111-050124-
/O.EXP.KMKX.SV.W.0084.000000T0000Z-120905T0115Z/
IOWA WI-SAUK WI-
814 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAUK AND
NORTHEASTERN IOWA COUNTIES WILL EXPIRE AT 815 PM CDT...

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

LAT...LON 4331 9000 4330 8989 4331 8982 4321 8984
      4310 8987 4310 9014 4315 9018 4316 9019
TIME...MOT...LOC 0114Z 269DEG 55KT 4344 8918 4310 8982

$$

MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 9:07 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.