Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 47, NWS Milwaukee, WI

May 12, 2011Kenosha County, Walworth County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 12, 2011, 5:12 PM CDT for Kenosha County, Walworth County, Wisconsin. It was in force for 48 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: May 12, 2011, 5:12 PM CDT (22:12 UTC)
Expired: May 12, 2011, 6:00 PM CDT
In force: 48 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Kenosha County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 52 km from the middle of the area, began a volume at 22:12 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
May 12, 5:43 PM CDT	HAIL 0.25	Twin Lakes, 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
May 12, 1:41 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.2 hours before the alert went out and 214 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: 122 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 130 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.

928 
WUUS53 KMKX 122212
SVRMKX
WIC059-127-122300-
/O.NEW.KMKX.SV.W.0047.110512T2212Z-110512T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
512 PM CDT THU MAY 12 2011

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN KENOSHA COUNTY IN SOUTHEAST WISCONSIN...
  SOUTHEASTERN WALWORTH COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 600 PM CDT

* AT 507 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 6 MILES
  SOUTHEAST OF HARVARD...AND MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GENOA CITY AND PELL LAKE AROUND 540 PM CDT.
  POWERS LAKE AND TWIN LAKES AROUND 550 PM CDT.
  SILVER LAKE...CAMP LAKE AND PADDOCK LAKE AROUND 600 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE SLADES
CORNERS...BASSETT AND NEW MUNSTER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4261 8831 4261 8815 4255 8801 4249 8811
      4249 8850
TIME...MOT...LOC 2212Z 226DEG 19KT 4240 8848
WIND...HAIL 60MPH 1.00IN

$$

KUHLMAN

5 follow-up statements

188 
WWUS53 KMKX 122221
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
521 PM CDT THU MAY 12 2011

WIC059-127-122300-
/O.CON.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
WALWORTH WI-KENOSHA WI-
521 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
KENOSHA AND SOUTHEASTERN WALWORTH COUNTIES UNTIL 600 PM CDT...

AT 517 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
HEBRON...OR 5 MILES NORTHWEST OF WONDER LAKE...MOVING NORTHEAST AT 25
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  GENOA CITY AND PELL LAKE AROUND 535 PM CDT.
  TWIN LAKES AND POWERS LAKE AROUND 545 PM CDT.
  SILVER LAKE AND CAMP LAKE AROUND 555 PM CDT.
  PADDOCK LAKE AROUND 600 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE SLADES
CORNERS...BASSETT...NEW MUNSTER AND SALEM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4261 8831 4261 8815 4255 8801 4249 8811
      4249 8850
TIME...MOT...LOC 2221Z 227DEG 21KT 4244 8841
WIND...HAIL 60MPH 1.00IN

$$

SEARS

976 
WWUS53 KMKX 122233
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
533 PM CDT THU MAY 12 2011

WIC059-127-122300-
/O.CON.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
WALWORTH WI-KENOSHA WI-
533 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
KENOSHA AND SOUTHEASTERN WALWORTH COUNTIES UNTIL 600 PM CDT...

AT 530 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
GENOA CITY...OR NEAR TWIN LAKES...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TWIN LAKES AND POWERS LAKE AROUND 540 PM CDT.
  SILVER LAKE AND CAMP LAKE AROUND 555 PM CDT.
  PADDOCK LAKE AROUND 600 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE
BASSETT...SLADES CORNERS...NEW MUNSTER AND SALEM.

A GUST FRONT WILL PUSH THROUGH PRIOR TO THE STORM PASSAGE...WITH 
WINDS UP TO 40 MPH. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4261 8831 4261 8815 4255 8801 4249 8811
      4249 8850
TIME...MOT...LOC 2232Z 227DEG 21KT 4249 8832
WIND...HAIL 60MPH 1.00IN

$$

SEARS

422 
WWUS53 KMKX 122241
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
541 PM CDT THU MAY 12 2011

WIC059-127-122300-
/O.CON.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
WALWORTH WI-KENOSHA WI-
541 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
KENOSHA AND SOUTHEASTERN WALWORTH COUNTIES UNTIL 600 PM CDT...

AT 540 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 TWIN
LAKES...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CAMP LAKE AROUND 550 PM CDT.
  SILVER LAKE AROUND 555 PM CDT.
  PADDOCK LAKE AROUND 600 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE NEW
MUNSTER...SALEM AND BRISTOL.

THE GUST FRONT ARRIVING PRIOR TO THE STORM MAY PRODUCE WINDS UP TO 
40 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4261 8831 4261 8815 4255 8801 4249 8811
      4249 8850
TIME...MOT...LOC 2241Z 227DEG 21KT 4252 8826
WIND...HAIL 60MPH 1.00IN

$$

SEARS

711 
WWUS53 KMKX 122250
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
550 PM CDT THU MAY 12 2011

WIC127-122259-
/O.CAN.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
WALWORTH WI-
550 PM CDT THU MAY 12 2011

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

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

LAT...LON 4257 8807 4249 8813 4249 8830 4261 8830
      4261 8815
TIME...MOT...LOC 2249Z 227DEG 21KT 4255 8821

$$

WIC059-122300-
/O.CON.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
KENOSHA WI-
550 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
KENOSHA COUNTY UNTIL 600 PM CDT...

AT 544 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 TWIN
LAKES...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SILVER LAKE AND CAMP LAKE AROUND 555 PM CDT.
  PADDOCK LAKE AROUND 600 PM CDT.

OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE SALEM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4257 8807 4249 8813 4249 8830 4261 8830
      4261 8815
TIME...MOT...LOC 2249Z 227DEG 21KT 4255 8821
WIND...HAIL 60MPH 1.00IN

$$

SEARS

366 
WWUS53 KMKX 122254
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
554 PM CDT THU MAY 12 2011

WIC059-122304-
/O.EXP.KMKX.SV.W.0047.000000T0000Z-110512T2300Z/
KENOSHA WI-
554 PM CDT THU MAY 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN KENOSHA COUNTY
WILL EXPIRE AT 600 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 STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 PM CDT.

LAT...LON 4257 8807 4249 8813 4249 8830 4261 8830
      4261 8815
TIME...MOT...LOC 2254Z 227DEG 21KT 4257 8818

$$

SEARS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 3:26 AM CDT	Marine Dense Fog Advisory	MKX		30 hr
May 12, 3:30 AM CDT	Dense Fog Advisory	MKX	Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan	3 hr
May 12, 2:33 PM CDT	Severe Thunderstorm Warning	MKX	Marquette	14 min
May 12, 3:35 PM CDT	Severe Thunderstorm Warning	MKX	Marquette	40 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every severe thunderstorm warning in 2011

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.