719 FZUS63 KMQT 081401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 AM EDT Wed Jul 8 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 Hudson Bay low moves into northern Quebec throughout today, sending a trough as low as 29.9 inches over the Upper Great Lakes. Weak high pressure to 30.0 inches then builds over Lake Superior and northern Ontario Thursday and Friday. Saturday, the high builds to 30.1 inches as it shifts towards 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. LSZ162-082000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 AM EDT Wed Jul 8 2026 /901 AM CDT Wed Jul 8 2026/ .REST OF TODAY...Northeast winds 5 to 15 knots veering south late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots. Waves calm to 2 feet. .THURSDAY NIGHT...North winds less than 10 knots. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots increasing to 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Northeast winds 5 to 15 knots becoming north less than 10 knots after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ263-082000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Northeast winds 5 to 15 knots diminishing to less than 10 knots in the afternoon, then becoming southwest 5 to 15 knots late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots veering north in the afternoon, then becoming southwest 5 to 15 knots late. Waves calm to 2 feet. .THURSDAY NIGHT...East winds less than 10 knots veering west after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots becoming west less than 10 knots after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ264-082000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Southwest winds less than 10 knots becoming south 5 to 15 knots late. A slight chance of showers by late morning. Waves calm to 2 feet. .TONIGHT...Southwest winds 5 to 15 knots veering west after midnight, then diminishing to less than 10 knots late. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots. Waves calm to 2 feet. .THURSDAY NIGHT...West winds less than 10 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots veering southeast by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to 3 feet. $$ LSZ265-082000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...Northeast winds 5 to 15 knots veering east in the afternoon. A chance of showers. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots backing northeast after midnight. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots veering east late. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...East winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. $$ LSZ266-082000- 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- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...East winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots backing northwest late. A slight chance of thunderstorms through midnight. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots. 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. $$ LSZ267-082000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 AM EDT Wed Jul 8 2026 .REST OF TODAY...East winds 5 to 15 knots backing northeast late. A slight chance of thunderstorms by late morning. A chance of showers. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots backing northwest late. A slight chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Northeast winds 5 to 15 knots veering south. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. $$ LSZ261-082000- MAFOR 0815/ Superior West 11100 11300 11500 12600 13500. A chance of showers late this morning. Waves 1 foot or less. Superior North Central 11600 13500 12600 12700. Waves 1 foot or less. Superior South Central 11100 12200 11300 12100 11800 11700. A chance of showers this afternoon. Waves 1 foot or less. Superior East 12200 11100 13800 12700. A chance of showers this afternoon. Waves 1 foot or less. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes  800 FZUS61 KBUF 081402 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 AM EDT Wed Jul 8 2026 For waters beyond five nautical miles of shore on Lake Ontario Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A broad 30.1 inch high will remain over the lower Great Lakes through Wednesday night while slowly drifting southeast toward the Delmarva. A weak cold front will cross the Lake Thursday night through early Friday, while another 30.1 inch high builds across the upper Great Lakes Friday, then expands across the lower Great Lakes later Friday night through the weekend. LOZ062-082100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 AM EDT Wed Jul 8 2026 .THIS AFTERNOON...Light and variable winds. Waves 1 foot or less. .TONIGHT...South winds 5 to 10 knots becoming southwest. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots becoming west. Showers likely with scattered thunderstorms in the afternoon. Waves 1 foot or less. .THURSDAY NIGHT...Southwest winds 5 to 10 knots becoming west. Showers likely. Waves around 1 foot. .FRIDAY...Northwest winds 10 knots or less becoming north. Showers likely during the day. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less becoming southeast. Waves 1 foot or less. .SUNDAY...East winds 10 knots or less becoming south. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-082100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 AM EDT Wed Jul 8 2026 .THIS AFTERNOON...South winds 10 knots or less becoming northwest. Waves 1 foot or less. .TONIGHT...South winds 10 knots or less becoming southwest. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots becoming west. A chance of showers in the afternoon. Waves 1 foot or less. .THURSDAY NIGHT...West winds 5 to 10 knots. Showers likely. Waves 1 foot or less. .FRIDAY...Northwest winds 5 to 10 knots becoming north. Showers likely during the day. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less becoming south. Waves 1 foot or less. .SUNDAY...South winds 10 knots or less. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-082100- MAFOR 0815/ ONTARIO WEST 1/2 11600 11100 12400 14500. Waves 1 foot or less. ONTARIO EAST 1/2 11400 11700 11500 11400 14500. Waves 1 foot or less. $$  830 FZUS61 KBUF 081403 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1003 AM EDT Wed Jul 8 2026 SLZ022-024-082100- Saint Lawrence River from Cape Vincent to Saint Regis 1003 AM EDT Wed Jul 8 2026 .THIS AFTERNOON...Southwest winds 5 to 10 knots. Sunny. .TONIGHT...Southwest winds 10 knots or less. Mainly clear through the early overnight, then becoming partly cloudy. .THURSDAY...Southwest winds 10 knots or less becoming west. A chance of showers in the morning, then showers and scattered thunderstorms in the afternoon. .THURSDAY NIGHT...West winds less than 10 knots. Showers and scattered thunderstorms in the evening, then showers overnight. .FRIDAY...Northwest winds less than 10 knots becoming north. A chance of showers during the day. .SATURDAY...North winds less than 10 knots. Mainly clear. .SUNDAY...Light and variable winds. Mainly clear, then becoming partly cloudy. Winds and waves higher in and near thunderstorms. $$  038 FZUS63 KMKX 081408 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 908 AM CDT Wed Jul 8 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... High pressure around 30.1 inches will remain over the Ohio Valley today and tonight. Modest south winds will continue today, as weak low pressure around 29.8 inches and an accompanying cold front approaches from Lake Superior and Minnesota. Modest southwest winds tonight will become north behind the frontal passage Thursday into Thursday night. Winds will become north to northeast on Friday, as high pressure around 30.1 inches builds into the the region. The high should continue to bring light to modest winds for the weekend. LMZ261-362-364-366-563-565-567-868-082115- 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- 908 AM CDT Wed Jul 8 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TODAY...Southwest winds 10 to 15 kt increasing to 10 to 20 kt. Scattered showers and slight chance of thunderstorms late this morning, then chance of showers and thunderstorms this afternoon. Waves 1 to 3 ft. .TONIGHT...Southwest winds 10 to 20 kt diminishing to 10 to 15 kt late in the evening, then veering to northwest 5 to 10 kt after midnight becoming north late. Patchy fog. Showers likely with a chance of thunderstorms. Waves 1 to 3 ft. .THURSDAY...North winds 10 to 15 kt increasing to 10 to 20 kt. Patchy fog in the morning. Chance of showers in the morning. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 10 to 15 kt diminishing to 5 to 10 kt. Waves 1 to 2 ft. .FRIDAY...Northeast winds 10 to 15 kt becoming north 15 to 25 kt in the afternoon. Waves 1 to 2 ft building to 1 to 3 ft. .FRIDAY NIGHT...Northeast winds 10 to 20 kt becoming east 5 to 10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft. .SATURDAY...Southeast winds 5 to 10 kt becoming southwest 10 to 15 kt. Waves 1 ft or less. .SUNDAY...Southwest winds 10 to 20 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-082115- 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- 908 AM CDT Wed Jul 8 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TODAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 3 ft. .TONIGHT...South winds 10 to 20 kt becoming southwest 10 to 15 kt. Chance of showers and thunderstorms in the evening, then chance of showers and slight chance of thunderstorms overnight. Patchy fog overnight. Waves 1 to 3 ft. .THURSDAY...Southwest winds 10 to 15 kt veering to north 10 to 20 kt. Chance of showers. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 10 to 15 kt diminishing to 5 to 10 kt. Chance of showers in the evening. Waves 1 to 2 ft. .FRIDAY...North winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft. .FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 10 to 15 kt. Waves 2 to 4 ft. .SATURDAY...East winds 5 to 10 kt becoming north 10 to 15 kt. Waves 1 to 2 ft. .SUNDAY...Southeast winds 10 to 15 kt veering to southwest 10 to 20 kt. Waves 1 ft or less. $$ LMZ761-082115- MAFOR 0816/ MICHIGAN NORTH 11520 19526 11510 11526 11416 11616 11806 12810. Waves 2 feet or less. MICHIGAN SOUTH 11410 12420 12410 13510. A chance of showers and thunderstorms this evening, then a chance of showers overnight. A chance of showers Thursday morning. Waves 2 feet or less. $$ Gehring Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes