Rapidly developing low pressure moved across western Ohio and southeast Lower Michigan during the overnight period of October 19th and morning of October 20th.  An associated strong pressure gradient and lingering unstable conditions over Lake Michigan allowed strong gusty north to northeast winds to mix down to the lake surface.  The lake surface temperature at this time was estimated to be in the 54 to 58 degree range.  Wind gusts reached 50 to 70 mph along the lake shore.  The strong winds caused high waves of 12 to 16 feet.  The strong winds and high waves caused extensive damage to boats in the South Shore Yacht Club, mainly due to an eroding and failing breakwall protecting the southern part of Milwaukee Harbor.  Three boats were totally destroyed at the yacht club.  Four others were washed ashore and were able to be salvaged.  Two of the destroyed boats were sunk.  One person at the Club, while trying to secure a boat with a rope line, was tossed about on the boat due to wave action and injured (directly-related).

Marine High Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 18:00:00 to 19-OCT-11 18:00:00 (CST-6)
Location: RACINE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Measured at Racine Yacht Club.

Marine High Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 21:00:00 to 19-OCT-11 21:00:00 (CST-6)
Location: WIND POINT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage at Shoop Park Golf Couse in Wind Point.  Wind gust speed and time estimated.

Marine High Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 13:23:00 to 19-OCT-11 13:23:00 (CST-6)
Location: RACINE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Measured gust at Racine Yacht Club.

Marine High Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 15:10:00 to 19-OCT-11 15:10:00 (CST-6)
Location: KENOSHA
Magnitude: 47.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Measured at KNSW3 lake shore observation site.  Sustained winds of 38 knots at time of gust.

Marine Strong Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 23:15:00 to 19-OCT-11 23:15:00 (CST-6)
Location: RACINE
Magnitude: 40.00 MG
Property damage: 0.10K
Reported by: Mesonet

Measured at 21st Century Prep School.

Marine Strong Wind in SHEBOYGAN TO PT WASHINGTON WI, LAKE MICHIGAN
From 19-OCT-11 16:00:00 to 19-OCT-11 16:00:00 (CST-6)
Location: SHEBOYGAN
Magnitude: 45.00 MG
Property damage: 0.10K
Reported by: C-MAN Station

Measured at SGNW3 marine observation platform.  Prevailing winds of 41 knots at time of wind gust.

Marine Strong Wind in LM SHEBOYGAN WI TO WINTHROP HARBOR IL EWD BYD 5NM TO MID LINE OF LAKE, LAKE MICHIGAN
From 19-OCT-11 23:20:00 to 19-OCT-11 23:20:00 (CST-6)
Location: SHEBOYGAN
Magnitude: 41.00 MG
Property damage: 0.10K
Reported by: Mesonet

Measured at Sheboygan North High School.

Marine Strong Wind in NORTH PT LT TO WIND PT WI, LAKE MICHIGAN
From 19-OCT-11 16:00:00 to 19-OCT-11 16:00:00 (CST-6)
Location: NORTH POINT LTHOUSE
Magnitude: 42.00 MG
Property damage: 0.10K
Reported by: C-MAN Station

Measured at MLWW3 marine observation platform.

Marine Strong Wind in SHEBOYGAN TO PT WASHINGTON WI, LAKE MICHIGAN
From 19-OCT-11 18:00:00 to 19-OCT-11 18:00:00 (CST-6)
Location: SHEBOYGAN
Magnitude: 46.00 MG
Property damage: 0.10K
Reported by: C-MAN Station

Measured at SGNW3 marine observation platform.  Prevailing winds of 37 knots at time of gust.

Marine High Wind in WIND PT LT WI TO WINTHROP HBR IL, LAKE MICHIGAN
From 19-OCT-11 18:20:00 to 19-OCT-11 18:20:00 (CST-6)
Location: KENOSHA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Measured at KNSW3 marine observation platform.  Prevailing wind 43 knots at time of wind gust.

Marine Strong Wind in NORTH PT LT TO WIND PT WI, LAKE MICHIGAN
From 19-OCT-11 19:00:00 to 19-OCT-11 19:00:00 (CST-6)
Location: NORTH POINT LTHOUSE
Magnitude: 46.00 MG
Property damage: 300.00K
Reported by: C-MAN Station

Measured at MLWW3 marine observation platform.