007 FZUS61 KBUF 082001 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 401 PM 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. LOZ062-090300- Lake Ontario open waters from the Niagara River to Hamlin Beach- 401 PM EDT Wed Jul 8 2026 .TONIGHT...Southeast 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 and thunderstorms early in the afternoon. Showers likely with a chance of thunderstorms late. Waves 1 foot or less. .THURSDAY NIGHT...West winds 5 to 10 knots. Showers with a chance of thunderstorms in the evening, then showers likely overnight. Waves 1 foot or less. .FRIDAY...Northwest winds less than 10 knots becoming west. Showers likely in the morning. Waves 1 foot or less. .FRIDAY NIGHT...West winds 10 knots or less becoming northeast. Waves 2 feet or less. .SATURDAY...Northeast winds 10 knots or less. Waves 2 feet or less. .SUNDAY...East winds 10 knots or less becoming southwest. Waves 1 foot or less. .MONDAY...Southwest winds 5 to 10 knots. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-090300- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 401 PM EDT Wed Jul 8 2026 .TONIGHT...South winds 10 knots or less becoming southwest. Waves 1 foot or less. .THURSDAY...Southwest winds 5 to 10 knots becoming west. A chance of showers and thunderstorms late. Waves 1 foot or less. .THURSDAY NIGHT...West winds 5 to 10 knots. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 1 foot or less. .FRIDAY...Northwest winds 5 to 10 knots becoming west. Showers likely in the morning. Waves 1 foot or less. .FRIDAY NIGHT...Northwest winds 5 to 10 knots becoming north. Waves 1 foot or less. .SATURDAY...Northeast winds 10 knots or less. Waves 2 feet or less. .SUNDAY...East winds 10 knots or less becoming south. Waves 1 foot or less. .MONDAY...Southwest winds 5 to 10 knots. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-090300- MAFOR 0821/ ONTARIO WEST 1/2 11300 11400 14500 11500 11600. A chance of showers Thursday afternoon. Waves 1 foot or less. ONTARIO EAST 1/2 11300 11400 15500. Waves 1 foot or less. $$  036 FZUS63 KMQT 082001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM 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 this evening, sending a 29.9 inch trough 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 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. LSZ162-090800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 PM EDT Wed Jul 8 2026 /301 PM CDT Wed Jul 8 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/ THURSDAY... .LATE THIS AFTERNOON...North winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots diminishing to less than 10 knots after midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...North winds less than 10 knots. Patchy dense fog through early afternoon. 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 less than 10 knots backing north after midnight. Waves calm to 2 feet. .SATURDAY...South winds less than 10 knots becoming north 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...North winds 5 to 15 knots backing southwest after midnight. 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. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. $$ LSZ263-090800- 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 PM EDT Wed Jul 8 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY... .LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TONIGHT...West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots backing southwest in the afternoon, then increasing to 5 to 15 knots late. Patchy fog. Waves calm to 2 feet. .THURSDAY NIGHT...Southwest winds less than 10 knots backing southeast after midnight, then backing east late. 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 veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southwest winds less than 10 knots becoming south 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...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. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-090800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 PM EDT Wed Jul 8 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY... .LATETHIS AFTERNOON...Southwest winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TONIGHT...Southwest winds less than 10 knots veering west after midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...West winds less than 10 knots. Patchy dense fog. Waves calm to 2 feet. .THURSDAY NIGHT...West winds less than 10 knots veering north late. Waves calm to 2 feet. .FRIDAY...East winds less than 10 knots. Waves calm to 2 feet. .FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY...South winds less than 10 knots increasing to 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots veering southwest after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 15 to 25 knots increasing to 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ265-090800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Wed Jul 8 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY... .LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots backing east after midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north in the afternoon, then veering east late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering north late. 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. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots becoming southwest 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet. .MONDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 2 to 4 feet. $$ LSZ266-090800- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 401 PM EDT Wed Jul 8 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY... .LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog. A slight chance of showers. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots backing north after midnight, then backing northwest late. A slight chance of showers and thunderstorms through midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots. Patchy dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...Northeast winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots becoming southwest 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves building to 1 to 3 feet. .MONDAY...Southwest winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ267-090800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 PM EDT Wed Jul 8 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY... .LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A slight chance of showers. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots veering north after midnight. A slight chance of showers through midnight. Patchy dense fog. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots late. Patchy fog. Waves calm to 2 feet. .THURSDAY NIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .FRIDAY...North winds 5 to 15 knots backing northwest by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...North winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet. .SATURDAY NIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...West winds 5 to 15 knots becoming southwest 10 to 20 knots. Waves building to 2 to 4 feet. $$ LSZ261-090200- MAFOR 0821/ Superior West 11600 19604 12700 19704 12600 19604 11500 19504 11600 11800. Waves 1 foot or less. Superior North Central 11500 12500 19504 11600 19604 13700 19704 11600 19604. Waves 1 foot or less. Superior South Central 11200 11300 11200 19204 11100 19104 11800 19804 11700 19704 11700 11800. Waves 1 foot or less. Superior East 11200 19204 12700 19704 11800 19804 12700 19704 12700. Waves 1 foot or less. $$ 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  058 FZUS61 KBUF 082002 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 401 PM EDT Wed Jul 8 2026 SLZ022-024-090300- Saint Lawrence River from Cape Vincent to Saint Regis 401 PM EDT Wed Jul 8 2026 .TONIGHT...Southwest winds 10 knots or less. Mainly clear early, then becoming partly cloudy. .THURSDAY...Southwest winds 10 knots or less becoming west. Showers with a chance of thunderstorms in the afternoon. .THURSDAY NIGHT...West winds less than 10 knots. Showers with a chance of thunderstorms in the evening, then showers overnight. .FRIDAY...Light and variable winds. A chance of showers in the morning. .FRIDAY NIGHT...North winds less than 10 knots. Mainly clear. .SATURDAY...North winds less than 10 knots. Mainly clear. .SUNDAY...Light and variable winds. Mainly clear. .MONDAY...Southwest winds 10 knots or less. Partly cloudy. Winds and waves higher in and near thunderstorms. $$