Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 86, NWS Milwaukee, WI

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

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 7:48 PM CDT for Columbia County, Dane County, Sauk County, Wisconsin. It was in force for 42 min. 3 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, 7:48 PM CDT (00:48 UTC)
Expired: Sep 4, 2012, 8:30 PM CDT
In force: 42 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Columbia County, WI, Dane County, WI, Sauk County, WI

The radar

The Milwaukee radar (KMKX), 90 km from the middle of the area, began a volume at 00:51 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
Sep 4, 7:49 PM CDT	TSTM WND DMG	Merrimac, WI	MULTIPLE POWERLINES AND LARGE TREES DOWN ACROSS THE AREA. TIME ESTIMATED.
Sep 4, 8:10 PM CDT	TSTM WND DMG	Portage, WI	TREES AND POWERLINES DOWN ACROSS THE ENTIRE COUNTY. TIME ESTIMATED.
Sep 4, 8:14 PM CDT	TSTM WND GST 58	Madison Truax 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, 0.8 hours before the alert went out and 155 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.

465 
WUUS53 KMKX 050048
SVRMKX
WIC021-025-111-050130-
/O.NEW.KMKX.SV.W.0086.120905T0048Z-120905T0130Z/

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COLUMBIA COUNTY IN SOUTH CENTRAL WISCONSIN...
  NORTH CENTRAL DANE COUNTY IN SOUTH CENTRAL WISCONSIN...
  EASTERN SAUK COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 830 PM CDT

* AT 747 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 NEAR
  BARABOO...AND MOVING SOUTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LAKE WISCONSIN AND PORTAGE AROUND 755 PM CDT.
  I90/94 WI RIVER BRIDGE AROUND 800 PM CDT.
  LODI AROUND 805 PM CDT.
  POYNETTE AND PARDEEVILLE AROUND 810 PM CDT.
  WAUNAKEE AROUND 815 PM CDT.
  DE FOREST...RIO AND WINDSOR AROUND 820 PM CDT.
  MADISON TRUAX AIRPORT AROUND 825 PM CDT.
  SUN PRAIRIE AROUND 830 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
MERRIMAC...OKEE...HARMONY GROVE...INTERSTATE 90/94 INTERCHANGE...
ARLINGTON...MORRISONVILLE AND EAST BRISTOL.

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 4364 8941 4347 8902 4307 8918 4330 8982
      4365 8971
TIME...MOT...LOC 0048Z 296DEG 34KT 4347 8965
WIND...HAIL 60MPH 1.00IN

$$

WOOD

3 follow-up statements

316 
WWUS53 KMKX 050104
SVSMKX

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

WIC021-025-111-050130-
/O.CON.KMKX.SV.W.0086.000000T0000Z-120905T0130Z/
COLUMBIA WI-DANE WI-SAUK WI-
804 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
SAUK...NORTH CENTRAL DANE AND COLUMBIA COUNTIES UNTIL 830 PM CDT...

AT 801 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
POYNETTE...OR 9 MILES EAST OF LAKE WISCONSIN...MOVING SOUTHEAST AT 45
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  DE FOREST...RIO AND WINDSOR AROUND 810 PM CDT.
  MADISON TRUAX AIRPORT AROUND 815 PM CDT.
  SUN PRAIRIE AROUND 820 PM CDT.
  COTTAGE GROVE AROUND 825 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE EAST
BRISTOL.

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 4364 8941 4347 8902 4307 8918 4330 8982
      4365 8971
TIME...MOT...LOC 0104Z 299DEG 39KT 4337 8936
WIND...HAIL 70MPH 1.25IN

$$
MBK

119 
WWUS53 KMKX 050118
SVSMKX

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

WIC021-025-111-050130-
/O.CON.KMKX.SV.W.0086.000000T0000Z-120905T0130Z/
COLUMBIA WI-DANE WI-SAUK WI-
818 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
SAUK...NORTH CENTRAL DANE AND COLUMBIA COUNTIES UNTIL 830 PM CDT...

AT 815 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 NEAR
RIO...OR 11 MILES WEST OF COLUMBUS...MOVING EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  COTTAGE GROVE AROUND 830 PM CDT.

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 4364 8941 4347 8902 4307 8918 4338 8967
      4365 8966
TIME...MOT...LOC 0118Z 285DEG 28KT 4339 8920
WIND...HAIL 70MPH 1.00IN

$$
MBK

854 
WWUS53 KMKX 050129
SVSMKX

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

WIC021-025-111-050138-
/O.EXP.KMKX.SV.W.0086.000000T0000Z-120905T0130Z/
COLUMBIA WI-DANE WI-SAUK WI-
829 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SAUK...NORTH
CENTRAL DANE AND COLUMBIA COUNTIES WILL EXPIRE AT 830 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11 PM CDT. 

LAT...LON 4364 8941 4347 8902 4307 8918 4338 8967
      4365 8966
TIME...MOT...LOC 0128Z 281DEG 44KT 4337 8895

$$

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, 7:46 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Sauk	59 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.