Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 56, NWS Milwaukee, WI

July 24, 2012Rock County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 24, 2012, 4:33 AM CDT for Rock County, Wisconsin. It was in force for 42 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: Jul 24, 2012, 4:33 AM CDT (09:33 UTC)
Expired: Jul 24, 2012, 5:15 AM CDT
In force: 42 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Rock County, WI

The radar

The Milwaukee radar (KMKX), 54 km from the middle of the area, began a volume at 09:33 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
Jul 24, 4:56 AM CDT	TSTM WND DMG	Janesville Airport, WI	MULTIPLE TREES REPORTED DOWN TO COUNTY DISPATCH ACROSS WESTERN ROCK COUNTY IN THE FOOTVILLE...EVANSVILLE AND ORFORDVILLE AREAS.
Jul 24, 5:00 AM CDT	TSTM WND DMG	Beloit, WI	TREES DOWN BLOCKING ROADWAY ON HIGHWAY 213 BETWEEN YAHARA AND LUTHER VALLEY ROADS. REPORT FROM JANESVILLE GAZETTE.
Jul 24, 5:02 AM CDT	TSTM WND GST 52	2 S Janesville Airport, WI	PEAK GUST BEFORE LOST POWER.
Jul 24, 5:08 AM CDT	TSTM WND GST 50	Janesville Airport, WI

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

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.6 hours before the alert went out and 167 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: 1702 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 2470 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

229 
WUUS53 KMKX 240933
SVRMKX
WIC105-241015-
/O.NEW.KMKX.SV.W.0056.120724T0933Z-120724T1015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
433 AM CDT TUE JUL 24 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROCK COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 515 AM CDT

* AT 428 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM STOUGHTON TO LENA...AND MOVING SOUTHEAST AT 50 MPH. PENNY SIZE
  HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  EDGERTON...MILTON...DOWNTOWN JANESVILLE...BELOIT...FOOTVILLE...
  ORFORDVILLE...JANESVILLE AIRPORT...CLINTON...MAGNOLIA...FULTON...
  INDIANFORD...HANOVER...NEWARK...AFTON...JOHNSTOWN CENTER...EMERALD
  GROVE...AVALON...TIFFANY AND SHOPIERE.

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 4252 8936 4260 8937 4284 8934 4285 8917
      4284 8901 4285 8901 4284 8892 4283 8883
      4250 8880
TIME...MOT...LOC 0933Z 299DEG 43KT 4286 8918 4238 8980
WIND...HAIL 60MPH 0.75IN

$$
MBK

3 follow-up statements

796 
WWUS53 KMKX 240950
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
450 AM CDT TUE JUL 24 2012

WIC105-241015-
/O.CON.KMKX.SV.W.0056.000000T0000Z-120724T1015Z/
ROCK WI-
450 AM CDT TUE JUL 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ROCK COUNTY
UNTIL 515 AM CDT...

AT 447 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM MILTON TO DURAND...MOVING SOUTHEAST AT 50 MPH. PENNY SIZE HAIL
MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

AT 440 AM CDT...TRAINED SPOTTERS REPORTED 60 MPH WINDS NEAR MONROE 
IN SOUTH CETNRAL GREEN COUNTY. 

LOCATIONS IMPACTED INCLUDE...
  MILTON...DOWNTOWN JANESVILLE...BELOIT...JANESVILLE AIRPORT...
  CLINTON...AFTON...EMERALD GROVE...JOHNSTOWN CENTER...TIFFANY...
  SHOPIERE AND AVALON.

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 4252 8936 4260 8937 4284 8934 4285 8917
      4284 8901 4285 8901 4284 8892 4283 8883
      4250 8880
TIME...MOT...LOC 0949Z 299DEG 43KT 4279 8899 4247 8931
WIND...HAIL 60MPH 0.75IN

$$
MBK

714 
WWUS53 KMKX 241003
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
503 AM CDT TUE JUL 24 2012

WIC105-241015-
/O.CON.KMKX.SV.W.0056.000000T0000Z-120724T1015Z/
ROCK WI-
503 AM CDT TUE JUL 24 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
ROCK COUNTY UNTIL 515 AM CDT...

AT 501 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM 8 MILES SOUTHEAST OF MILTON TO ROCKTON...MOVING SOUTHEAST AT 50
MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

IN ADDITION...ROCK COUNTY LAW ENFORCEMENT REPORTED MULTIPLE TREES 
BLOWN DOWN IN THE FOOTVILLE...ORFORDVILLE AND EVANSVILLE AREAS 
BETWEEN 430 AM CDT AND 5 AM CDT WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  CLINTON...TIFFANY...SHOPIERE AND AVALON.

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 4252 8928 4259 8921 4272 8905 4278 8900
      4283 8896 4285 8901 4283 8883 4250 8880
TIME...MOT...LOC 1002Z 299DEG 43KT 4271 8880 4239 8913
WIND...HAIL 60MPH 0.75IN

$$
MBK

676 
WWUS53 KMKX 241015
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
515 AM CDT TUE JUL 24 2012

WIC105-241025-
/O.EXP.KMKX.SV.W.0056.000000T0000Z-120724T1015Z/
ROCK WI-
515 AM CDT TUE JUL 24 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ROCK COUNTY HAS
EXPIRED...

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

LAT...LON 4252 8928 4259 8921 4272 8905 4278 8900
      4283 8896 4285 8901 4283 8883 4250 8880
TIME...MOT...LOC 1015Z 299DEG 43KT 4263 8862 4231 8895

$$
MBK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 3:14 AM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette, Sauk	61 min
Jul 24, 4:07 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Green, Iowa, Lafayette	38 min
Jul 24, 5:00 AM CDT	Severe Thunderstorm Warning	MKX	Walworth	40 min
Jul 24, 9:27 AM CDT	Heat Advisory	MKX	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	36 hr
Jul 24, 2:44 PM CDT	Small Craft Advisory	MKX		31 hr

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.