Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 82, NWS Milwaukee, WI

August 19, 2012Ozaukee County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 19, 2012, 4:46 PM CDT for Ozaukee County, Wisconsin. It was in force for 44 min. 5 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: Aug 19, 2012, 4:46 PM CDT (21:46 UTC)
Expired: Aug 19, 2012, 5:30 PM CDT
In force: 44 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Ozaukee County, WI

The radar

The Milwaukee radar (KMKX), 64 km from the middle of the area, began a volume at 21:48 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
Aug 19, 4:50 PM CDT	HAIL 1.75	Grafton, WI
Aug 19, 4:54 PM CDT	HAIL 0.88	1 Sw Saukville, WI	A MIXTURE OF VARIOUS SIZE HAIL..PEA, NICKEL, AND QUARTER.
Aug 19, 4:54 PM CDT	HAIL 1	1 Sw Saukville, WI	A MIXTURE OF VARIOUS SIZE HAIL..PEA, NICKEL, AND QUARTER.
Aug 19, 5:00 PM CDT	TSTM WND GST 41	Grafton, WI	GRFTN
Aug 19, 5:36 PM CDT	HAIL 0.5	1 E Mequon, WI	INTERSECTION OF MEQUON ROAD AND I-43 1/2 INCH HAIL AND ESTIMATED 45 MPH WINDS.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.8 hours before the alert went out and 132 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: 25 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

914 
WUUS53 KMKX 192146
SVRMKX
WIC089-192230-
/O.NEW.KMKX.SV.W.0082.120819T2146Z-120819T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
446 PM CDT SUN AUG 19 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL OZAUKEE COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 530 PM CDT

* AT 444 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND STORM   
  SPOTTERS INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING      
  QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.        
  THIS STORM WAS LOCATED NEAR SAUKVILLE...AND MOVING SOUTHEAST AT 10 
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GRAFTON AROUND 455 PM CDT.
  CEDARBURG AROUND 500 PM CDT.
  THIENSVILLE AND MEQUON AROUND 525 PM CDT.

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 4336 8787 4331 8788 4326 8791 4324 8791
      4321 8789 4320 8789 4319 8798 4338 8803
      4344 8791 4338 8786
TIME...MOT...LOC 2146Z 329DEG 8KT 4336 8794
WIND...HAIL 60MPH 1.00IN

$$

WOOD

3 follow-up statements

394 
WWUS53 KMKX 192205
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
505 PM CDT SUN AUG 19 2012

WIC089-192230-
/O.CON.KMKX.SV.W.0082.000000T0000Z-120819T2230Z/
OZAUKEE WI-
505 PM CDT SUN AUG 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
OZAUKEE COUNTY UNTIL 530 PM CDT...

AT 505 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING HALF DOLLAR SIZE HAIL.  THIS STORM WAS LOCATED
NEAR GRAFTON...MOVING SOUTHEAST AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  THIENSVILLE AROUND 515 PM CDT.
  MEQUON AROUND 520 PM CDT.

OTHER STORMS EXTEND BACK INTO EAST CENTRAL WASHINGTON COUNTY. 
THEREFORE RESIDENTS OF SOUTHER OZAUKEE COUNTY CAN EXPECT HAIL 
PRODUCING STORMS THROUGH 530 PM.

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 4336 8787 4331 8788 4326 8791 4324 8791
      4321 8789 4320 8789 4319 8798 4338 8803
      4344 8791 4338 8786
TIME...MOT...LOC 2204Z 329DEG 9KT 4331 8790
WIND...HAIL <50MPH 1.25IN

$$

KAPELA

739 
WWUS53 KMKX 192225
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
525 PM CDT SUN AUG 19 2012

WIC089-192230-
/O.CON.KMKX.SV.W.0082.000000T0000Z-120819T2230Z/
OZAUKEE WI-
525 PM CDT SUN AUG 19 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL
OZAUKEE COUNTY UNTIL 530 PM CDT...

AT 525 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL.  THIS
STORM WAS LOCATED NEAR THIENSVILLE...MOVING SOUTH AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MEQUON AROUND 530 PM CDT.

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 4336 8787 4331 8788 4326 8791 4324 8791
      4321 8789 4320 8789 4319 8798 4338 8803
      4344 8791 4338 8786
TIME...MOT...LOC 2225Z 349DEG 13KT 4325 8793
WIND...HAIL <50MPH 1.25IN

$$

KAPELA

043 
WWUS53 KMKX 192230
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
530 PM CDT SUN AUG 19 2012

WIC089-192239-
/O.EXP.KMKX.SV.W.0082.000000T0000Z-120819T2230Z/
OZAUKEE WI-
530 PM CDT SUN AUG 19 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL OZAUKEE COUNTY WILL
EXPIRE AT 530 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STORMS ARE POSSIBLE INTO THE EVENING HOURS. NEW WARNINGS 
WILL BE ISSUED IF NEEDED.

LAT...LON 4336 8787 4331 8788 4326 8791 4324 8791
      4321 8789 4320 8789 4319 8798 4338 8803
      4344 8791 4338 8786
TIME...MOT...LOC 2229Z 349DEG 13KT 4324 8793

$$

KAPELA

The office that day

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

Issued	Product	Office	Lasted
Aug 19, 1:44 PM CDT	Special Marine Warning	MKX	91 min
Aug 19, 2:07 PM CDT	Special Marine Warning	MKX	113 min
Aug 19, 3:15 PM CDT	Special Marine Warning	MKX	2 hr
Aug 19, 3:57 PM CDT	Special Marine Warning	MKX	93 min
Aug 19, 5:15 PM CDT	Special Marine Warning	MKX	101 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.