Illinois North Offshore Forecast lmz777: Expires:202505100930;;253836 FZUS63 KMKX 100218 GLFLM
OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 918 PM CDT Fri May 9 2025
FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.
Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
.SYNOPSIS…
Southwest winds are expected into the overnight hours, as a cold front approaches from the northern Great Plains. A few light rain showers are possible along and ahead of the approaching front, though most locations will remain dry. The cold front will cross the open waters overnight through Saturday morning, bringing a quick north to northeast wind shift and becoming gusty. The highest gusts will be over the southern half of Lake Michigan, though gales are not expected.
Winds will taper Saturday night, as high pressure around 30.5 inches lingers along the Ontario and Quebec border. The high will continue to influence winds across the southern third of Lake Michigan on Sunday, when northeast winds are forecast. Southwest winds will become established across the northern two-thirds of the open waters on Sunday afternoon, as 29.4 inch low pressure builds into the northern Great Plains. The aforementioned area of low pressure will continue deepening to near 29.2 inches on Monday, resulting in southeast winds across the southern open waters. Southwest winds will prevail further north.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-100930- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 918 PM CDT Fri May 9 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH…
.REST OF TONIGHT…Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Chance of sprinkles overnight. Waves 1 to 3 ft. .SATURDAY…West winds 10 to 20 kt becoming northwest 15 to 25 kt late in the morning, then becoming north to 30 kt in the afternoon. Waves 1 to 3 ft building to 4 to 7 ft occasionally to 9 ft. .SATURDAY NIGHT…North winds to 30 kt becoming northeast 10 to 15 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SUNDAY…East winds 10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. .SUNDAY NIGHT…East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 3 ft. .MONDAY…Southeast winds 10 to 15 kt becoming east. Waves 1 to 3 ft. .MONDAY NIGHT…East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 2 ft. .TUESDAY…Southeast winds 10 to 15 kt. Waves 1 to 3 ft. .WEDNESDAY…Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
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OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 918 PM CDT Fri May 9 2025
FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.
Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.
.SYNOPSIS…
Southwest winds are expected into the overnight hours, as a cold front approaches from the northern Great Plains. A few light rain showers are possible along and ahead of the approaching front, though most locations will remain dry. The cold front will cross the open waters overnight through Saturday morning, bringing a quick north to northeast wind shift and becoming gusty. The highest gusts will be over the southern half of Lake Michigan, though gales are not expected.
Winds will taper Saturday night, as high pressure around 30.5 inches lingers along the Ontario and Quebec border. The high will continue to influence winds across the southern third of Lake Michigan on Sunday, when northeast winds are forecast. Southwest winds will become established across the northern two-thirds of the open waters on Sunday afternoon, as 29.4 inch low pressure builds into the northern Great Plains. The aforementioned area of low pressure will continue deepening to near 29.2 inches on Monday, resulting in southeast winds across the southern open waters. Southwest winds will prevail further north.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-100930- Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake- Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake- Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake- Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake- Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake- Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 918 PM CDT Fri May 9 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH…
.REST OF TONIGHT…Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Chance of sprinkles overnight. Waves 1 to 3 ft. .SATURDAY…West winds 10 to 20 kt becoming northwest 15 to 25 kt late in the morning, then becoming north to 30 kt in the afternoon. Waves 1 to 3 ft building to 4 to 7 ft occasionally to 9 ft. .SATURDAY NIGHT…North winds to 30 kt becoming northeast 10 to 15 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SUNDAY…East winds 10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. .SUNDAY NIGHT…East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 3 ft. .MONDAY…Southeast winds 10 to 15 kt becoming east. Waves 1 to 3 ft. .MONDAY NIGHT…East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 2 ft. .TUESDAY…Southeast winds 10 to 15 kt. Waves 1 to 3 ft. .WEDNESDAY…Southeast winds 10 to 15 kt. Waves 1 to 2 ft.
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