301 FZUS63 KMKX 181514 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 1013 AM CDT Mon May 18 2026 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... Areas of dense fog over the lake this morning with breezy south to southwest winds today. These winds will increase slightly across the lake late tonight and remain breezy ahead of the cold frontal passage expected Tuesday afternoon as the low pressure system around 29.6 inches swings northeast of the Lake into Ontario. High pressure around 30.4 inches will push in with light and variable winds taking hold from late Wednesday into Thursday. LMZ261-362-364-366-563-565-567-868-182100- Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM offshore to Mid Lake- Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and north of a line from Charlevoix MI to South Fox Island 5 NM offshore- Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to Mid Lake- Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to Mid Lake- Lake Michigan from Rock Island Passage to Sturgeon Bay WI- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid Lake- 1013 AM CDT Mon May 18 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TODAY...South winds to 30 kt. Patchy fog. Chance of showers and slight chance of thunderstorms late this morning, then slight chance of showers and thunderstorms this afternoon. Waves 4 to 6 ft occasionally to 8 ft. .TONIGHT...South winds 15 to 25 kt increasing to 30 kt. Patchy dense fog in the evening, then areas of dense fog overnight. Chance of rain showers and thunderstorms overnight. Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to 10 ft. .TUESDAY...South winds to 30 kt veering to west. Chance of rain showers. Waves 7 to 10 ft occasionally to 13 ft. .TUESDAY NIGHT...Northwest winds 15 to 25 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .WEDNESDAY...North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 2 to 4 ft. .WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to 5 to 10 kt. Waves 1 to 3 ft. .THURSDAY...East winds 5 to 10 kt becoming northeast 10 to 20 kt. Waves 1 to 2 ft. .FRIDAY...Southeast winds 10 to 20 kt becoming east. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-182100- 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- 1013 AM CDT Mon May 18 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TODAY...South winds 15 to25 kt. Chance of showers and slight chance of thunderstorms late this morning, then slight chance of showers and thunderstorms this afternoon. Patchy fog this afternoon. Waves 4 to 6 ft occasionally to 8 ft. .TONIGHT...South winds 15 to 25 kt increasing to 30 kt. Patchy fog in the evening, then patchy dense fog overnight. Slight chance of showers and thunderstorms in the evening, then chance of showers and thunderstorms overnight. Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to 10 ft. .TUESDAY...South winds to 30 kt becoming west 15 to 25 kt. Waves 6 to 9 ft occasionally to 12 ft. .TUESDAY NIGHT...Northwest winds 10 to 20 kt becoming north. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .WEDNESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt. Waves 3 to 5 ft. .WEDNESDAY NIGHT...Northeast winds 10 to 20 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft. .THURSDAY...East winds 10 to 20 kt becoming northeast. Waves 2 to 4 ft. .FRIDAY...East winds 10 to 20 kt diminishing to 10 to 15 kt. Waves 2 to 4 ft. $$ LMZ761-182100- MAFOR 1816 AMD/ MICHIGAN NORTH 11440 11430 12430 19434 11433 13440. A chance of showers late this morning. A chance of showers and thunderstorms overnight. A chance of showers Tuesday morning. Waves 3 to 5 feet this afternoon. Waves 3 to 6 feet building to 5 to 8 feet tonight. Waves 6 to 9 feet Tuesday morning. MICHIGAN SOUTH 15430 12440. A chance of showers this afternoon. A chance of showers and thunderstorms overnight. Waves 3 to 5 feet this afternoon. Waves 3 to 6 feet building to 4 to 7 feet tonight. Waves 6 to 9 feet Tuesday morning. $$ WFO MKX Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes