Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 87, NWS Milwaukee, WI

September 4, 20126 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 4, 2012, 8:12 PM CDT for 6 counties in Wisconsin. It was in force for 63 min. 9 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, 8:12 PM CDT (01:12 UTC)
Expired
Sep 4, 2012, 9:15 PM CDT
In force
63 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Jefferson County, WI, Rock County, WI

The radar

The Milwaukee radar (KMKX), 55 km from the middle of the area, began a volume at 01:15 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

TimeReportWhereRemark
Sep 4, 8:12 PM CDTTSTM WND GST 601 Ne Camp Randall Stadi, WI
Sep 4, 8:14 PM CDTTSTM WND GST 58Madison Truax Airport, WI
Sep 4, 8:24 PM CDTTSTM WND DMG2 Ssw Stoughton, WIESTIMATED 2 FOOT TREE LIMB DOWN. BLOCKING SOUTH BOUND LANE OF CTY HWY A. TIME ESTIMATED.
Sep 4, 8:24 PM CDTTSTM WND DMGNew Glarus, WININE TREES DOWN ACROSS THE COUNTY...MAINLY IN NORTH. TIME ESTIMATED.
Sep 4, 8:31 PM CDTTSTM WND DMGJefferson, WITREES DOWN ACROSS THE COUNTY...PARTICULARLY IN LAKE MILLS. TIME ESTIMATED.
Sep 4, 8:35 PM CDTTSTM WND DMGEdgerton, WILARGE TREE BLOCKING WASHINGTON STREET IN EDGERTON. TIME IS ESTIMATED.
Sep 4, 8:39 PM CDTTSTM WND GST 601 Ne Stoughton, WI
Sep 4, 8:48 PM CDTTSTM WND DMGJanesville, WITREES DOWN ACROSS THE COUNTY...MAINLY IN THE NORTHERN HALF. TIME ESTIMATED.
Sep 4, 8:53 PM CDTTSTM WND GST 601 E Fort Atkinson, 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.

IssuedProductOfficeLasted
Sep 4, 3:27 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 177 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2012-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1890 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2012-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

427 
WUUS53 KMKX 050112
SVRMKX
WIC021-025-027-045-055-105-050215-
/O.NEW.KMKX.SV.W.0087.120905T0112Z-120905T0215Z/

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN COLUMBIA COUNTY IN SOUTH CENTRAL WISCONSIN...
  DANE COUNTY IN SOUTH CENTRAL WISCONSIN...
  SOUTHWESTERN DODGE COUNTY IN SOUTHEAST WISCONSIN...
  NORTHERN GREEN COUNTY IN SOUTH CENTRAL WISCONSIN...
  JEFFERSON COUNTY IN SOUTHEAST WISCONSIN...
  NORTHERN ROCK COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 915 PM CDT

* AT 810 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
  DE FOREST...AND MOVING SOUTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MADISON TRUAX AIRPORT...MAPLE BLUFF...MADISON CAPITOL SQUARE AND
  SHOREWOOD HILLS AROUND 820 PM CDT.
  SUN PRAIRIE...I90/94 INTERCHANGE...MONONA AND FITCHBURG AROUND 825
  PM CDT.
  COTTAGE GROVE...MARSHALL...MCFARLAND AND BELLEVILLE AROUND 830 PM
  CDT.
  WATERLOO...OREGON AND MONTICELLO AROUND 835 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE TOKEN
CREEK...UTICA...ROCKDALE...ALBION AND BUSSEYVILLE.

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 4280 8984 4283 8984 4323 8964 4347 8902
      4297 8855 4284 8872 4284 8878 4280 8878
      4267 8895 4262 8947
TIME...MOT...LOC 0112Z 317DEG 38KT 4324 8936
WIND...HAIL 70MPH 1.00IN

$$

WOOD
4 follow-up statements
859 
WWUS53 KMKX 050131
SVSMKX

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

WIC021-025-027-045-055-105-050215-
/O.CON.KMKX.SV.W.0087.000000T0000Z-120905T0215Z/
COLUMBIA WI-DANE WI-DODGE WI-GREEN WI-JEFFERSON WI-ROCK WI-
831 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
ROCK...JEFFERSON...NORTHERN GREEN...SOUTHWESTERN DODGE...DANE AND
SOUTHEASTERN COLUMBIA COUNTIES UNTIL 915 PM CDT...

AT 829 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 9 MILES NORTHEAST OF WATERLOO TO
JEFFERSON TO EVANSVILLE TO NEW GLARUS...MOVING SOUTHEAST AT 45 MPH.

IN ADDITION...AT 814 PM...DANE COUNTY REGIONAL AIRPORT REPORTED A 
WIND GUST TO 58 MPH WITH THESE STORMS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  MONTICELLO...JEFFERSON...EVANSVILLE AND EDGERTON AROUND 835 PM CDT.
  JOHNSON CREEK AND FORT ATKINSON AROUND 840 PM CDT.
  MILTON AND ALBANY AROUND 845 PM CDT.
  DOWNTOWN JANESVILLE AND FOOTVILLE AROUND 850 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE FULTON...
BUSSEYVILLE...MAGNOLIA...INDIANFORD...HELENVILLE...HEBRON...ROME AND
SULLIVAN.

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 4280 8984 4283 8984 4323 8964 4347 8902
      4297 8855 4284 8872 4284 8878 4280 8878
      4267 8895 4262 8947
TIME...MOT...LOC 0130Z 317DEG 38KT 4327 8886 4300 8887
          4280 8929 4282 8961
WIND...HAIL 70MPH 1.00IN

$$
MBK
532 
WWUS53 KMKX 050151
SVSMKX

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

WIC021-025-027-045-055-105-050215-
/O.CON.KMKX.SV.W.0087.000000T0000Z-120905T0215Z/
COLUMBIA WI-DANE WI-DODGE WI-GREEN WI-JEFFERSON WI-ROCK WI-
851 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
ROCK...JEFFERSON...NORTHERN GREEN...SOUTHWESTERN DODGE...EASTERN DANE
AND SOUTHEASTERN COLUMBIA COUNTIES UNTIL 915 PM CDT...

AT 847 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM WATERTOWN TO FORT ATKINSON TO
FOOTVILLE TO MONROE AIRPORT...MOVING SOUTHEAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  DOWNTOWN JANESVILLE AROUND 900 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE ROME AND
SULLIVAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4280 8984 4283 8984 4299 8950 4313 8913
      4346 8904 4347 8903 4297 8855 4284 8872
      4284 8878 4280 8878 4267 8895 4262 8947
TIME...MOT...LOC 0151Z 317DEG 25KT 4319 8865 4289 8875
          4269 8917 4266 8954
WIND...HAIL 70MPH 1.00IN

$$

MBK
535 
WWUS53 KMKX 050206
SVSMKX

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

WIC021-050214-
/O.CAN.KMKX.SV.W.0087.000000T0000Z-120905T0215Z/
COLUMBIA WI-
906 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COLUMBIA COUNTY
IS CANCELLED...

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

LAT...LON 4280 8984 4283 8984 4303 8904 4324 8883
      4341 8898 4297 8855 4284 8872 4284 8878
      4280 8878 4267 8895 4262 8947
TIME...MOT...LOC 0204Z 317DEG 25KT 4312 8857 4282 8867
          4262 8909 4259 8946

$$

WIC025-027-045-055-105-050215-
/O.CON.KMKX.SV.W.0087.000000T0000Z-120905T0215Z/
DANE WI-DODGE WI-GREEN WI-JEFFERSON WI-ROCK WI-
906 PM CDT TUE SEP 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
ROCK...JEFFERSON...NORTHERN GREEN...SOUTHWESTERN DODGE AND
SOUTHEASTERN DANE COUNTIES UNTIL 915 PM CDT...

AT 901 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 7 MILES EAST OF WATERTOWN AIRPORT
TO WHITEWATER TO JANESVILLE AIRPORT TO 5 MILES WEST OF BRODHEAD...
MOVING SOUTHEAST AT 30 MPH.

IN ADDITION...AT THE DODGE COUNTY AIRPORT IN JUNEAU...A WIND GUST TO 
51 MPH WAS REPORTED AT 855 PM CDT WITH THESE STORMS.

SEVERE THUNDERSTORMS WILL AFFECT MAINLY RURAL AREAS OF JEFFERSON...
NORTHERN GREEN...NORTHERN ROCK...SOUTHEASTERN DANE AND SOUTHWESTERN
DODGE COUNTIES...INCLUDING THE FOLLOWING LOCATIONS NWS
SULLIVAN/MILWAUKEE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4280 8984 4283 8984 4303 8904 4324 8883
      4341 8898 4297 8855 4284 8872 4284 8878
      4280 8878 4267 8895 4262 8947
TIME...MOT...LOC 0204Z 317DEG 25KT 4312 8857 4282 8867
          4262 8909 4259 8946
WIND...HAIL 70MPH 1.00IN

$$
MBK
892 
WWUS53 KMKX 050213
SVSMKX

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

WIC025-027-045-055-105-050222-
/O.EXP.KMKX.SV.W.0087.000000T0000Z-120905T0215Z/
DANE WI-DODGE WI-GREEN WI-JEFFERSON WI-ROCK WI-
913 PM CDT TUE SEP 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ROCK...JEFFERSON...
NORTHERN GREEN...SOUTH CENTRAL DODGE AND SOUTHEASTERN DANE COUNTIES
WILL EXPIRE AT 915 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED SOUTHEAST 
OUT OF THE WARNED AREA.  HOWEVER GUSTY WINDS ARE STILL POSSIBLE WITH 
THESE THUNDERSTORMS.

LAT...LON 4280 8984 4283 8984 4303 8904 4324 8883
      4341 8898 4297 8855 4284 8872 4284 8878
      4280 8878 4267 8895 4262 8947
TIME...MOT...LOC 0212Z 317DEG 25KT 4308 8852 4278 8862
          4258 8904 4255 8941

$$

MBK

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 7:20 PM CDTSevere Thunderstorm WarningMKXIowa, Sauk55 min
Sep 4, 7:46 PM CDTSevere Thunderstorm WarningMKXDane, Iowa, Sauk59 min
Sep 4, 7:48 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Sauk42 min
Sep 4, 8:16 PM CDTSevere Thunderstorm WarningMKXGreen, Iowa, Lafayette59 min
Sep 4, 8:35 PM CDTSevere Thunderstorm WarningMKXDodge, Jefferson, Rock, Walworth, Washington, Waukesha55 min
Sep 4, 8:45 PM CDTSpecial Marine WarningMKX2 hr
Sep 4, 9:07 PM CDTSevere Thunderstorm WarningMKXKenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington and 1 more83 min
Sep 4, 9:57 PM CDTSevere Thunderstorm WarningMKXFond du Lac, Sheboygan34 min
Sep 4, 10:01 PM CDTSpecial Marine WarningMKX65 min
Sep 4, 10:45 PM CDTSpecial Marine WarningMKX45 min
Sep 5, 3:05 AM CDTSevere Thunderstorm WarningMKXIowa, Lafayette55 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Every 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.