Chicago Offshore Forecast lmz779: Expires:202505110930;;308238 FZUS63 KMKX 110205 GLFLM
OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 905 PM CDT Sat May 10 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…
Northeasterly winds will continue to taper off into tonight as 30.5 inch high pressure drifts south along the Ontario-Quebec border, shifting to southwesterly across the northern half of the lake Sunday afternoon as the high exits eastward. Light and variable winds are then expected Sunday night into Monday before southeasterly winds return Monday night into Tuesday morning. Brief periods of east-northeast winds are forecast during the afternoon hours on Tuesday and Wednesday as an area of 29.8 inch low pressure approaches southern Lake Michigan from the Ohio Valley. Isolated thunderstorms are also possible during these time frames. A larger area of 29.4 inch low pressure will form in the northern Great Plains Wednesday night, crossing northern Lake Michigan Thursday night, leading to increasing southeast winds across the open waters through Thursday afternoon. Gales are not expected at this time, though trends will be monitored in the coming forecasts. More widespread thunderstorm potential will accompany the passing low, with the best chances Thursday evening and night.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-110930- 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- 905 PM CDT Sat May 10 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH…
.REST OF TONIGHT…North winds 15 to 25 kt diminishing to 10 to 20 kt late this evening, then becoming northeast after midnight diminishing to 10 to 15 kt late. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft. .SUNDAY…East winds 10 to 15 kt becoming northeast. Waves 1 to 3 ft subsiding to 1 to 2 ft. .SUNDAY NIGHT…Northeast winds 10 to 15 kt veering to southeast. Waves 1 to 2 ft. .MONDAY…Southeast winds 5 to 10 kt becoming east 10 to 15 kt. Waves 1 to 2 ft. .MONDAY NIGHT…East winds 5 to 10 kt becoming southeast. Chance of showers in the evening. Waves 1 to 2 ft. .TUESDAY…Southeast winds 5 to 10 kt becoming east. Waves 1 to 2 ft. .TUESDAY NIGHT…East winds 5 to 10 kt becoming southeast. Waves 1 to 2 ft. .WEDNESDAY…Southeast winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 to 2 ft. .THURSDAY…Southeast winds 10 to 20 kt. Waves 2 to 4 ft building to 3 to 5 ft.
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OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 905 PM CDT Sat May 10 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…
Northeasterly winds will continue to taper off into tonight as 30.5 inch high pressure drifts south along the Ontario-Quebec border, shifting to southwesterly across the northern half of the lake Sunday afternoon as the high exits eastward. Light and variable winds are then expected Sunday night into Monday before southeasterly winds return Monday night into Tuesday morning. Brief periods of east-northeast winds are forecast during the afternoon hours on Tuesday and Wednesday as an area of 29.8 inch low pressure approaches southern Lake Michigan from the Ohio Valley. Isolated thunderstorms are also possible during these time frames. A larger area of 29.4 inch low pressure will form in the northern Great Plains Wednesday night, crossing northern Lake Michigan Thursday night, leading to increasing southeast winds across the open waters through Thursday afternoon. Gales are not expected at this time, though trends will be monitored in the coming forecasts. More widespread thunderstorm potential will accompany the passing low, with the best chances Thursday evening and night.
LMZ080-669-671-673-675-777-779-870-872-874-876-878-110930- 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- 905 PM CDT Sat May 10 2025
SHEBOYGAN WI TO PENTWATER MI SOUTH…
.REST OF TONIGHT…North winds 15 to 25 kt diminishing to 10 to 20 kt late this evening, then becoming northeast after midnight diminishing to 10 to 15 kt late. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft. .SUNDAY…East winds 10 to 15 kt becoming northeast. Waves 1 to 3 ft subsiding to 1 to 2 ft. .SUNDAY NIGHT…Northeast winds 10 to 15 kt veering to southeast. Waves 1 to 2 ft. .MONDAY…Southeast winds 5 to 10 kt becoming east 10 to 15 kt. Waves 1 to 2 ft. .MONDAY NIGHT…East winds 5 to 10 kt becoming southeast. Chance of showers in the evening. Waves 1 to 2 ft. .TUESDAY…Southeast winds 5 to 10 kt becoming east. Waves 1 to 2 ft. .TUESDAY NIGHT…East winds 5 to 10 kt becoming southeast. Waves 1 to 2 ft. .WEDNESDAY…Southeast winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 to 2 ft. .THURSDAY…Southeast winds 10 to 20 kt. Waves 2 to 4 ft building to 3 to 5 ft.
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