496 FZUS63 KMQT 180201 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 PM EDT Fri Apr 17 2026 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS... A low of around 29.4 inches will move from just north of Lake Superior to the Hudson Bay overnight. Behind it, ridging builds over the lake, strengthening to about 30.3 inches Sunday night into Monday morning. This ridging quickly gives way to 29.8 inch troughing Monday night into Tuesday morning as a weakening low swings from the Hudson Bay shoreline of far northern Ontario into James Bay. High pressure ridging builds back to 30.2 inches over Lake Superior by Tuesday night. The high will shift east on Wednesday as a 29.2 inch low pressure develops over the high plains. LSZ162-180800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1000 PM EDT Fri Apr 17 2026 /900 PM CDT Fri Apr 17 2026/ .REST OF TONIGHT...West winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .SATURDAY...West winds 20 to 30 knots increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then diminishing to 20 to 30 knots late. A slight chance of snow showers. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY NIGHT...West winds 20 to 30 knots becoming northwest 15 to 25 knots after midnight. A slight chance of snow showers through midnight. Waves subsiding to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .MONDAY...South winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .TUESDAY...West winds 10 to 20 knots becoming northeast 5 to 15 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ263-180800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1000 PM EDT Fri Apr 17 2026 ...GALE WARNING IN EFFECT FROM 4 AM EDT SATURDAY THROUGH SATURDAY EVENING... .REST OF TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots after midnight. A chance of rain showers. Waves 3 to 5 feet occasionally to 7 feet building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 35 knots. A slight chance of snow showers. Waves building to 7 to 11 feet occasionally to 14 feet. .SATURDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to 25 knots. A slight chance of snow showers through midnight. Waves building to 8 to 11 feet occasionally to 14 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to 20 knots by mid afternoon. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves subsiding to calm to 2 feet. .MONDAY...South winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...South winds 20 to 30 knots veering west after midnight. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to 20 knots. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ264-180800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1000 PM EDT Fri Apr 17 2026 ...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING... ...GALE WARNING IN EFFECT FROM 4 AM EDT SATURDAY THROUGH SATURDAY EVENING... .REST OF TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots after midnight, then veering northwest late. A chance of rain showers. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet occasionally to 8 feet, then building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West winds 20 to 30 knots increasing to gales to 35 knots in the afternoon. A slight chance of snow showers. Waves building to 8 to 11 feet occasionally to 14 feet. .SATURDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to 30 knots after midnight. A slight chance of snow showers through midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots by mid afternoon. Waves subsiding to 2 to 4 feet. .SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots becoming south 15 to 25 knots by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...South winds 20 to 30 knots veering west after midnight. Waves building to 4 to 8 feet occasionally to 10 feet. .TUESDAY...West winds 15 to 25 knots becoming east 5 to 15 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...Southeast winds 5 to 15 knots increasing to 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ265-180800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1000 PM EDT Fri Apr 17 2026 ...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING... ...GALE WARNING IN EFFECT FROM 4 AM EDT SATURDAY THROUGH SATURDAY EVENING... .REST OF TONIGHT...South winds 20 to 30 knots becoming west gales to 35 knots after midnight. A slight chance of thunderstorms by midnight. A chance of rain showers. Waves 3 to 5 feet occasionally to 7 feet building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...West gales to 40 knots. A slight chance of snow showers. Waves building to 5 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...West gales to 40 knots becoming northwest gales to 35 knots after midnight. A slight chance of snow showers through midnight. Waves building to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots becoming southeast 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .MONDAY NIGHT...South gales to 35 knots veering southwest after midnight. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. .TUESDAY...Northwest winds 15 to 25 knots becoming north 5 to 15 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ266-180800- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 1000 PM EDT Fri Apr 17 2026 ...GALE WARNING IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... ...GALE WARNING IN EFFECT FROM 4 AM EDT SATURDAY THROUGH SATURDAY EVENING... .REST OF TONIGHT...South gales to 35 knots becoming west 20 to 30 knots after midnight, then becoming northwest gales to 35 knots late. A chance of showers and thunderstorms by midnight, then rain showers likely, possibly mixed with snow showers and sleet after midnight. Waves 4 to 8 feet occasionally to 10 feet, then building to 6 to 9 feet occasionally to 11 feet. .SATURDAY...Northwest gales to 35 knots backing west in the afternoon. A chance of rain showers through early afternoon. A slight chance of snow showers. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...West gales to 35 knots veering northwest after midnight. A slight chance of snow showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet. .SUNDAY...Northwest winds 20 to 30 knots. A slight chance of snow showers through early afternoon. Waves subsiding to 6 to 9 feet occasionally to 11 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .MONDAY...Southwest winds 5 to 15 knots becoming south 20 to 30 knots by mid afternoon. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...South gales to 40 knots veering southwest after midnight. Waves building to 7 to 10 feet occasionally to 13 feet. .TUESDAY...Northwest winds 20 to 30 knots becoming north 10 to 20 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ267-180800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1000 PM EDT Fri Apr 17 2026 ...GALE WARNING IN EFFECT FROM 4 AM EDT SATURDAY THROUGH SATURDAY EVENING... .REST OF TONIGHT...Southeast gales to 35 knots veering south after midnight, then becoming west 20 to 30 knots late. A chance of rain showers by midnight. A chance of thunderstorms. Rain showers, possibly mixed with sleet after midnight. Waves 3 to 6 feet occasionally to 8 feet, then building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest winds 20 to 30 knots becoming west gales to 40 knots in the afternoon. A chance of rain showers, possibly mixed with sleet through early afternoon. A slight chance of snow showers. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...West gales to 35 knots veering northwest after midnight. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 35 knots. A slight chance of snow showers through early afternoon. Waves subsiding to 7 to 10 feet occasionally to 13 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming north 5 to 15 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...West winds 5 to 15 knots becoming south 15 to 25 knots by mid afternoon. Waves subsiding to calm to 2 feet, then building to 2 to 4 feet. .MONDAY NIGHT...South gales to 35 knots veering southwest after midnight. Waves building to 6 to 10 feet occasionally to 13 feet. .TUESDAY...West winds 20 to 30 knots becoming northwest 5 to 15 knots. Waves subsiding to calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ261-180800- MAFOR 1803/ Superior West...GALE WARNING IN EFFECT...14640 11650 12640 11740. Waves 3 to 6 feet overnight. Waves 5 to 8 feet Saturday and Saturday evening. Superior North Central...GALE WARNING IN EFFECT...11640 12740 11640 13650 11750. A chance of rain showers overnight. Waves 4 to 7 feet overnight. Waves 5 to 9 feet building to 7 to 11 feet Saturday. Waves 7 to 11 feet Saturday evening. Superior South Central...GALE WARNING IN EFFECT...11546 11640 11740 14650 11650. Waves 3 to 6 feet building to 4 to 7 feet overnight. Waves 5 to 9 feet building to 7 to 11 feet Saturday. Waves 7 to 11 feet Saturday evening. Superior East...GALE WARNING IN EFFECT...11440 11646 11747 11750 14650. A chance of thunderstorms overnight. A chance of light sleet Saturday morning. Waves 4 to 7 feet overnight. Waves 7 to 11 feet building to 9 to 12 feet Saturday. Waves 10 to 13 feet Saturday evening. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes  625 FZUS61 KBUF 180210 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 PM EDT Fri Apr 17 2026 For waters beyond five nautical miles of shore on Lake Ontario Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A 30.0 inch high over the Lake this evening will slide east into New England tonight. Meanwhile, a 29.4 inch low near Lake Superior this evening will move to James Bay and deepen to 29.0 inches Saturday, while pushing a trailing strong cold front across the Lake later Saturday and Saturday evening. A 30.4 inch high will then settle southeastward across the Great Lakes Sunday through Monday night, before sliding off the mid-Atlantic coast Tuesday. A 29.4 inch low over lower Hudson Bay Tuesday, will weaken to 29.9 inches by Wednesday, while pushing an attendant weak cold front across the Lake Tuesday night. A 30.2 inch high will then build across the Great Lakes region Wednesday and Thursday. LOZ062-180900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 PM EDT Fri Apr 17 2026 .OVERNIGHT...East winds 5 to 15 knots. Patchy fog. Waves 2 feet or less. .SATURDAY...Southeast winds 10 to 15 knots becoming southwest 15 to 20 knots. Patchy fog early. A chance of showers late in the morning. Showers in the afternoon. Waves 1 to 3 feet. .SATURDAY NIGHT...West winds 15 to 20 knots diminishing to 10 to 15 knots. Rain showers likely. Waves 2 to 4 feet. .SUNDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain showers. Waves 2 to 4 feet building to 3 to 5 feet. .SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest. A chance of rain showers in the evening. Waves 3 to 5 feet. .MONDAY...Northwest winds 15 to 20 knots becoming southwest 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .TUESDAY...South winds 10 to 15 knots becoming northwest. A chance of rain showers. Waves 1 to 3 feet. .WEDNESDAY...North winds 5 to 15 knots becoming northeast. Waves 2 feet or less. $$ LOZ063>065-180900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 PM EDT Fri Apr 17 2026 .OVERNIGHT...Southeast winds 10 knots or less increasing to 10 to 15 knots. Patchy fog. Waves 2 feet or less. .SATURDAY...Southeast winds 15 to 25 knots becoming south. Patchy fog early. A chance of showers early in the afternoon. Showers late. Waves 1 to 3 feet building to 3 to 5 feet. .SATURDAY NIGHT...Southwest winds 15 to 25 knots becoming west. Rain showers. Waves 3 to 5 feet. .SUNDAY...West winds 10 to 15 knots increasing to 15 to 20 knots. Rain showers in the morning, then a chance of rain showers in the afternoon. Waves 2 to 4 feet building to 3 to 6 feet. .SUNDAY NIGHT...West winds 15 to 20 knots becoming northwest. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .MONDAY...Northwest winds 15 to 20 knots becoming west 10 to 15 knots. Waves 3 to 5 feet subsiding to 1 to 3 feet. .TUESDAY...South winds 15 to 20 knots becoming west 10 to 15 knots. A chance of rain showers. Waves 1 to 3 feet. .WEDNESDAY...Northwest winds 5 to 15 knots becoming north. Waves 1 to 3 feet subsiding to 1 foot or less. $$ LOZ061-180900- MAFOR 1803/ ONTARIO WEST 1/2 12200 12310 11420 11426 11520 11620. Waves 2 feet or less overnight. Waves 1 to 3 feet building to 2 to 4 feet Saturday. Waves 2 to 4 feet Saturday evening. ONTARIO EAST 1/2 12300 12320 11420 11430 11436 11526. Waves 2 feet or less overnight. Waves 1 to 3 feet building to 3 to 5 feet Saturday. Waves 3 to 5 feet Saturday evening. $$  770 FZUS61 KBUF 180211 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1011 PM EDT Fri Apr 17 2026 SLZ022-024-180900- Saint Lawrence River from Cape Vincent to Saint Regis 1011 PM EDT Fri Apr 17 2026 .OVERNIGHT...Light and variable winds. Mainly clear. .SATURDAY...Southeast winds 5 to 10 knots becoming south and increasing to 15 to 20 knots. A chance of showers late. .SATURDAY NIGHT...South winds 15 to 20 knots becoming west 10 to 15 knots. Rain showers. .SUNDAY...West winds 10 to 15 knots. Rain showers in the morning, then a chance of rain showers in the afternoon. .SUNDAY NIGHT...West winds 5 to 15 knots becoming northwest. Partly cloudy. .MONDAY...Northwest winds 10 knots or less becoming southwest. Partly cloudy, then becoming mainly clear. .TUESDAY...South winds 5 to 10 knots becoming west. A chance of rain showers. .WEDNESDAY...Northwest winds 10 knots or less. Partly cloudy. $$  831 FZUS63 KMKX 180218 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 918 PM CDT Fri Apr 17 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... Winds will become gusty and southeasterly through tonight, and strong to severe storms will cross the lake through late evening as a cold front sweeps through the area. Winds are expected to remain just below gale force. Dense fog will continue over the lake until the cold front clears late tonight. Winds then become northwesterly behind the cold front Saturday morning. Breezy northwesterly winds then continue Saturday through Sunday as the low then races northeast toward Hudson Bay. Winds ease Monday morning as high pressure tracks southeast over the upper Great Lakes. LMZ261-362-364-366-563-565-567-868-180930- 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- 918 PM CDT Fri Apr 17 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM CDT SATURDAY... .REST OF TONIGHT...South winds to 30 kt becoming west late. Patchy dense fog. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SATURDAY...Northwest winds to 30 kt becoming west 15 to 25 kt. Chance of rain showers in the morning, then chance of snow showers and slight chance of rain showers in the afternoon. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...West winds 15 to 25 kt. Waves 3 to 5 ft. .SUNDAY...Northwest winds 15 to 25 kt. Waves 3 to 5 ft. .SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 2 to 4 ft. .MONDAY...West winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft. .MONDAY NIGHT...South winds to 30 kt. Waves 6 to 9 ft occasionally to 12 ft. .TUESDAY...Southwest winds to 30 kt diminishing to 10 to 20 kt. Waves 6 to 9 ft occasionally to 12 ft. .WEDNESDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-180930- 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 Apr 17 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM CDT SATURDAY... .REST OF TONIGHT...South winds to 30 kt veering to west. Patchy dense fog late this evening, then areas of dense fog overnight. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .SATURDAY...Northwest winds to 30 kt becoming west 15 to 25 kt. Slight chance of rain showers in the morning. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...West winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 3 to 5 ft. .SUNDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves 2 to 4 ft. .MONDAY...East winds 5 to 10 kt becoming southeast 10 to 20 kt in the afternoon. Waves 1 to 2 ft building to 2 to 4 ft. .MONDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft. .TUESDAY...South winds to 30 kt diminishing to 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft. .WEDNESDAY...Northeast winds 10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. $$ LMZ761-180930- MAFOR 1804/ MICHIGAN NORTH 11446 19444 11546 19544 11740 11730 13630 11730. A chance of thunderstorms overnight. A chance of snow showers Saturday afternoon. Waves 3 to 6 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet Saturday. Waves 3 to 5 feet Saturday evening. MICHIGAN SOUTH 11446 19444 11546 19544 11640 19644 11740 11730 13630. Waves 3 to 6 feet subsiding to 2 to 4 feet overnight. Waves 3 to 6 feet Saturday and Saturday evening. $$ DDV Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes  877 FZUS63 KMKX 180254 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 953 PM CDT Fri Apr 17 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... Winds will become gusty and southeasterly through tonight, and strong to severe storms will cross the lake through late evening as a cold front sweeps through the area. Winds are expected to remain just below gale force. Dense fog will continue over the lake until the cold front clears late tonight. Winds then become northwesterly behind the cold front Saturday morning. Breezy northwesterly winds then continue Saturday through Sunday as the low then races northeast toward Hudson Bay. Winds ease Monday morning as high pressure tracks southeast over the upper Great Lakes. LMZ261-362-364-366-563-565-567-868-180900- 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- 953 PM CDT Fri Apr 17 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM CDT SATURDAY... .REST OF TONIGHT...South winds to 30 kt becoming west late. Patchy dense fog. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SATURDAY...Northwest winds to 30 kt becoming west 15 to 25 kt. Chance of rain showers in the morning, then chance of snow showers and slight chance of rain showers in the afternoon. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...West winds 15 to 25 kt. Waves 3 to 5 ft. .SUNDAY...Northwest winds 15 to 25 kt. Waves 3 to 5 ft. .SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 2 to 4 ft. .MONDAY...West winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft. .MONDAY NIGHT...South winds to 30 kt. Waves 6 to 9 ft occasionally to 12 ft. .TUESDAY...Southwest winds to 30 kt diminishing to 10 to 20 kt. Waves 6 to 9 ft occasionally to 12 ft. .WEDNESDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-180900- 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- 953 PM CDT Fri Apr 17 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM CDT SATURDAY... .REST OF TONIGHT...South winds to 30 kt veering to west. Patchy dense fog late this evening, then areas of dense fog overnight. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .SATURDAY...Northwest winds to 30 kt becoming west 15 to 25 kt. Slight chance of rain showers in the morning. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...West winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 3 to 5 ft. .SUNDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves 2 to 4 ft. .MONDAY...East winds 5 to 10 kt becoming southeast 10 to 20 kt in the afternoon. Waves 1 to 2 ft building to 2 to 4 ft. .MONDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Waves 4 to 6 ft occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft. .TUESDAY...South winds to 30 kt diminishing to 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft. .WEDNESDAY...Northeast winds 10 to 15 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. $$ LMZ761-180900- MAFOR 1804 AMD/ MICHIGAN NORTH 11456 19454 11556 19554 11740 11730 13630 11730. A chance of thunderstorms overnight. A chance of snow showers Saturday afternoon. Waves 3 to 6 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet Saturday. Waves 3 to 5 feet Saturday evening. MICHIGAN SOUTH 11446 19444 11546 19544 11640 19644 11740 11730 13630. Waves 3 to 6 feet subsiding to 2 to 4 feet overnight. Waves 3 to 6 feet Saturday and Saturday evening. $$ 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