118 FZUS63 KMQT 090801 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 AM EDT Thu Jul 9 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 29.9 inch trough is analyzed over the lake this morning, extending from low pressure currently moving into Quebec. Weak high pressure then builds to 30.0 inches over Lake Superior and northern Ontario today and Friday. Saturday, the high builds to 30.1 inches as it shifts toward southern Ontario. The high continues to shift south Sunday, reaching the Lower Great Lakes at 30.2 inches before weakening to 30.1 inches again Monday south of the Great Lakes. Another strong low of 29.3 inches looks to cross into Hudson Bay early next week. LSZ162-092000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 AM EDT Thu Jul 9 2026 /301 AM CDT Thu Jul 9 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/ THIS MORNING... .EARLY THIS MORNING...North winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...East winds less than 10 knots becoming north 5 to 15 knots in the afternoon, then diminishing to less than 10 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...North winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...North winds less than 10 knots becoming east 5 to 15 knots in the afternoon, then backing northeast late. A slight chance of showers by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots diminishing to less than 10 knots after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SATURDAY...East winds less than 10 knots becoming north 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Northeast winds less than 10 knots backing north after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 15 to 25 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. $$ LSZ263-092000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...West winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...East winds less than 10 knots backing north in the afternoon, then becoming northeast 5 to 15 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...West winds less than 10 knots backing southwest after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots backing northeast in the afternoon, then becoming east 5 to 15 knots late. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after midnight. A slight chance of showers and thunderstorms. Waves calm to 2 feet. .SATURDAY...South winds less than 10 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...East winds less than 10 knots becoming southwest 5 to 15 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-092000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECTUNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...West winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds less than 10 knots backing west late. Patchy dense fog. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots veering northwest after midnight, then diminishing to less than 10 knots late. Waves calm to 2 feet. .FRIDAY...Southeast winds less than 10 knots increasing to 5 to 15 knots late. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots diminishing to less than 10 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds less than 10 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ265-092000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots veering northeast in the afternoon, then veering east late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing south after midnight, then veering northwest late. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots veering east in the afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A slight chance of showers after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...West winds 10 to 20 knots becoming southwest 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. $$ LSZ266-092000- 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- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots. Patchy dense fog through early afternoon. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots backing northwest late. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ267-092000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 AM EDT Thu Jul 9 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots late. Patchy dense fog. Waves calm to 2feet. .TONIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southeast after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ261-091400- MAFOR 0909/ Superior West 12200 19204 11100 13800 11100 11300. Waves 1 foot or less. Superior North Central 11600 19604 11700 19704 11700 14600 11700. Waves 1 foot or less. Superior South Central 11100 19104 11600 19604 13800 11700 12600. Waves 1 foot or less. Superior East 11800 19804 11700 19704 15700. Waves 1 foot or less. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes  228 FZUS61 KBUF 090802 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 402 AM EDT Thu Jul 9 2026 For waters beyond five nautical miles of shore on Lake Ontario Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A 30.0 inch high will move off the Mid Atlantic coast today, giving way to a weak cold front that will cross the Lake tonight through early Friday. Another 30.0 inch high will then build across the upper Great Lakes Friday and the lower Great Lakes over the weekend, before drifting off the New England coast Monday. LOZ062-091500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 402 AM EDT Thu Jul 9 2026 .TODAY...Southwest winds 5 to 10 knots becoming northwest and increasing to 15 to 20 knots. A chance of showers and thunderstorms early this afternoon. Showers with a chance of thunderstorms late. Waves 2 feet or less. .TONIGHT...West winds 5 to 15 knots becoming northwest 10 knots or less. Showers with a chance of thunderstorms early, then a chance of showers and thunderstorms late in the evening. A chance of showers after midnight. Waves 2 feet or less. .FRIDAY...North winds less than 10 knots. Waves 1 foot or less. .FRIDAY NIGHT...Northwest winds 10 knots or less becoming northeast. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less. Waves 1 foot or less. .SUNDAY...Northeast winds less than 10 knots becoming south. Waves 1 foot or less. .MONDAY...Southwest winds 10 knots or less increasing to 10 to 15 knots. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-091500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 402 AM EDT Thu Jul 9 2026 .TODAY...Southwest winds 5 to 15 knots becoming northwest. A chance of showers and thunderstorms late. Waves 1 foot or less. .TONIGHT...Northwest winds 5 to 15 knots. A chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Waves 2 feet or less. .FRIDAY...Northwest winds 10 knots or less. A chance of showers in the morning. Waves 1 foot or less. .FRIDAY NIGHT...Northwest winds 10 knots or less becoming northeast. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less. Waves 2 feet or less. .SUNDAY...Northeast winds 10 knots or less becoming south. Waves 1 foot or less. .MONDAY...Southwest winds 5 to 15 knots. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-091500- MAFOR 0909/ ONTARIO WEST 1/2 12500 11600 11620 11716 12600 11700. A chance of thunderstorms this afternoon and evening. Waves 2 feet or less. ONTARIO EAST 1/2 13500 11600 12710 12600. A chance of showers and thunderstorms this afternoon. A chance of showers and thunderstorms this evening, then a chance of showers overnight. Waves 2 feet or less. $$  260 FZUS61 KBUF 090803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Thu Jul 9 2026 SLZ022-024-091500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Thu Jul 9 2026 .TODAY...Southwest winds 10 knots or less becoming north. A chance of showers late this morning. Showers with a chance of thunderstorms this afternoon. .TONIGHT...Northeast winds 5 to 10 knots becoming light and variable. Showers with a chance of thunderstorms through the early overnight, then a chance of showers late. .FRIDAY...Light and variable winds. Partly to mostly sunny. .FRIDAY NIGHT...North winds less than 10 knots. Mainly clear in the evening, then becoming partly cloudy. .SATURDAY...Northeast winds less than 10 knots. Mainly clear. .SUNDAY...Light and variable winds. Mainly clear. .MONDAY...Southwest winds 5 to 10 knots. Mainly clear, then becoming partly cloudy. Winds and waves higher in and near thunderstorms. $$  340 FZUS63 KMKX 090804 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 304 AM CDT Thu Jul 9 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... Light south winds will become north to northeast behind a cold front moving southward across the lake today into tonight. Some fog may develop at times during this period, with patchy dense fog possible, as warm air remains over the cooler lake waters. Winds will remain north to northeast on Friday, as high pressure around 30.0 inches builds into the the region from the north. The high should shift southeast over the weekend, which should continue to bring light to modest winds. LMZ261-362-364-366-563-565-567-868-091530- 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- 304 AM CDT Thu Jul 9 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .TODAY...North winds 10 to 15 kt. Patchy fog this morning. Chance of showers and slight chance of thunderstorms this morning, then slight chance of showers this afternoon. Waves 1 to 2 ft. .TONIGHT...North winds 10 to 15 kt diminishing to 5 to 10 kt. Patchy fog overnight. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 15 to 25 kt. Patchy fog in the morning. Waves 1 to 3 ft. .FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft. .SATURDAY...East winds 5 to 10 kt becoming northeast 10 to 20 kt in the afternoon. Waves 1 ft or less. .SATURDAY NIGHT...East winds 10 to 20 kt veering to south 10 to 15 kt. Waves 1 ft or less. .SUNDAY...Southwest winds 10 to 20 kt. Waves 1 to 2 ft. .MONDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Waves 2 to 4 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-091530- 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- 304 AM CDT Thu Jul 9 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .TODAY...South winds 10 to 15 kt becoming southwest. Chance of showers and slight chance of thunderstorms. Waves 1 to 2 ft. .TONIGHT...North winds 10 to 15 kt. Slight chance of showers and thunderstorms in the evening. Patchy fog overnight. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 15 to 25 kt. Patchy fog in the morning. Waves 1 to 3 ft building to 2 to 4 ft. .FRIDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to 15 kt overnight. Waves 2 to 4 ft. .SATURDAY...East winds 10 to 15 kt becoming north 10 to 20 kt. Waves 1 to 2 ft. .SATURDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt. Waves 1 to 2 ft. .SUNDAY...Southeast winds 5 to 10 kt increasing to 10 to 15 kt. Waves 1 ft or less. .MONDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft. $$ LMZ761-091530- MAFOR 0910/ MICHIGAN NORTH 15810 12800. A chance of showers this morning. Waves 1 foot or less. MICHIGAN SOUTH 11410 11410 19414 12510 12810 11800 11810. A chance of showers today. Waves 1 foot or less. $$ Wood Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes