294 FZUS63 KMQT 230201 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 PM EDT Sat Aug 22 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... Pressure rises continue over Lake Superior behind an exiting 29.9 inch trough. This is followed by 30.1 inch ridging for the latter part of the weekend into early next week via a 30.2 inch parent high from the Canadian Prairies that drops down into the Ohio River Valley by late Monday, weakening to 30.1 inches as it does so. A 29.7 inch low over the Canadian Prairies Monday night then drops southeast towards Lake Superior, arriving early Wednesday morning. The low shifts east Wednesday night with weak ridging of 29.9 inches building over the lake on Thursday. LSZ162-230800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 PM EDT Sat Aug 22 2026 /901 PM CDT Sat Aug 22 2026/ .REST OF TONIGHT...North winds 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...North winds 5 to 15 knots backing southwest late. Waves calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming northwest less than 10 knots after midnight. Waves calm to 2 feet. .MONDAY...North winds less than 10 knots becoming south 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots becoming south less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing east by mid afternoon. A chance of showers. Waves calm to 2 feet. .TUESDAY NIGHT...Northeast winds 5 to 15 knots backing north after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ263-230800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 PM EDT Sat Aug 22 2026 .REST OF TONIGHT...North winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet. .SUNDAY...North winds 10 to 20 knots becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots veering northwest late. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing east by mid afternoon. A chance of showers. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Showers likely and a chance of thunderstorms. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ264-230800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 PM EDT Sat Aug 22 2026 .REST OF TONIGHT...North winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves 1 to 3 feet building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots backing northwest late. Waves subsiding to 1 to 3 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots becoming southwest less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots backing north. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ265-230800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 PM EDT Sat Aug 22 2026 .REST OF TONIGHT...North winds 20 to 30 knots. A slight chance of showers by midnight. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. A slight chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming south 10 to 20 knots after midnight. Showers likely. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 10 to 20 knots veering northwest. A chance of showers. Waves building to 1 to 3 feet. .THURSDAY...North winds 15 to 25 knots becoming northwest 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. $$ LSZ266-230800- 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 PM EDT Sat Aug 22 2026 .REST OF TONIGHT...North winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. A slight chance of showers. Waves building to 4 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .MONDAY...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming south 15 to 25 knots after midnight. A chance of showers through midnight. Showers likely after midnight. Waves building to 1 to 3 feet. .WEDNESDAY...South winds 10 to 20 knots backing north. Showers likely. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .THURSDAY...Northwest winds 15 to 25 knots becoming north 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. $$ LSZ267-230800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 PM EDT Sat Aug 22 2026 .REST OF TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest in the afternoon, then increasing to 30 knots with a few gale force gusts to 35 knots possible late. A slight chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .MONDAY...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...West winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers. Waves calm to 2 feet. .WEDNESDAY...Southeast winds 10 to 20 knots. Showers likely. A chance of showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. .THURSDAY...Northwest winds 10 to 20 knots veering north. Waves calm to 2 feet. $$ LSZ261-230800- MAFOR 2303/ Superior West 14820 11810 13500. Waves 2 feet or less. Superior North Central 14830 11830 13720. Waves 2 to 4 feet. Superior South Central 15840 12740. Waves 3 to 5 feet overnight. Waves 4 to 7 feet Sunday. Waves 3 to 6 feet Sunday evening. Superior East 13830 12840 13740. Waves 3 to 5 feet overnight. Waves 3 to 6 feet building to 4 to 7 feet Sunday. Waves 4 to 7 feet Sunday 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  376 FZUS61 KBUF 230202 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 PM EDT Sat Aug 22 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 29.6 inch low should wobble northeastward from the central Great Lakes to southwestern Quebec through Monday. In response to the low's track, a warm front drifts northeastward across Lake Ontario tonight and then a cold front sweeps eastward across the lake overnight tonight through Sunday. Behind the cold front, a trough averaging 29.8 inches lingers over Lake Ontario through Monday. On Tuesday through Wednesday, a ridge averaging 30.1 inches builds from the western and central Great Lakes. The ridge should begin to exit eastward on Thursday and allow a warm front to sweep northeastward across Lake Ontario. LOZ062-230900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 PM EDT Sat Aug 22 2026 .OVERNIGHT...South winds 10 to 15 knots. Showers with a chance of thunderstorms. Waves 1 to 2 feet. .SUNDAY...Southwest winds 15 to 20 knots becoming west. A chance of waterspouts. Showers likely early, then a chance of showers late in the morning. Showers likely with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet building to 3 to 6 feet. .SUNDAY NIGHT...West winds 15 to 20 knots. A chance of waterspouts. Showers likely with a chance of thunderstorms in the evening, then showers overnight. Waves 4 to 6 feet. .MONDAY...Southwest winds 15 to 25 knots becoming west. A chance of waterspouts. Showers. Waves 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY NIGHT...West winds 15 to 20 knots. A chance of waterspouts. Showers likely in the evening, then a chance of showers overnight. Waves 4 to 7 feet subsiding to 3 to 6 feet. Waves occasionally around 9 feet. .TUESDAY...West winds 15 to 20 knots diminishing to 10 knots or less. A chance of waterspouts during the day. Showers likely during the day. Waves 2 to 4 feet subsiding to 1 foot or less. .WEDNESDAY...Southwest winds 10 knots or less becoming south. Waves 1 foot or less. .THURSDAY...South winds 5 to 10 knots becoming southwest. A chance of showers and thunderstorms. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-230900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 PM EDT Sat Aug 22 2026 .OVERNIGHT...South winds 15 to 25 knots. Showers with a chance of thunderstorms. Waves 1 to 3 feet building to 3 to 5 feet. .SUNDAY...South winds 15 to 25 knots becoming west. A chance of waterspouts. Showers with a chance of thunderstorms in the morning, then a chance of showers and thunderstorms early in the afternoon. Showers with a chance of thunderstorms late. Waves 3 to 5 feet building to 3 to 6 feet. .SUNDAY NIGHT...West winds 15 to 20 knots becoming southwest. A chance of waterspouts. Showers with a chance of thunderstorms in the evening, then showers overnight. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .MONDAY...Southwest winds 15 to 25 knots. A chance of waterspouts. Showers. Waves 5 to 8 feet building to 6 to 9 feet. Waves occasionally around 11 feet. .MONDAY NIGHT...West winds 15 to 20 knots. A chance of waterspouts. Showers. Waves 5 to 9 feet subsiding to 3 to 6 feet. Waves occasionally around 11 feet. .TUESDAY...West winds 15 to 20 knots diminishing to 5 to 15 knots. A chance of waterspouts. Showers during the day, then a chance of showers Tuesday night. Waves 3 to 6 feet subsiding to 1 to 3 feet. .WEDNESDAY...West winds 5 to 15 knots becoming south. Waves 2 feet or less. .THURSDAY...South winds 5 to 15 knots. A chance of showers during the day, then showers likely Thursday night. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LOZ061-230900- MAFOR 2303/ ONTARIO WEST 1/2 12416 11510 13620 11626 11620. A chance of waterspouts Sunday and Sunday evening. A chance of thunderstorms overnight, Sunday afternoon, and Sunday evening. Waves 1 to 3 feet overnight. Waves 1 to 3 feet building to 3 to 6 feet Sunday. Waves 4 to 6 feet Sunday evening. ONTARIO EAST 1/2 12426 11436 12520 11620 12626. A chance of waterspouts Sunday and Sunday evening. A chance of thunderstorms. Waves 1 to 3 feet building to 3 to 5 feet overnight. Waves 3 to 5 feet building to 3 to 6 feet Sunday. Waves 3 to 6 feet building to 4 to 7 feet, and occasionally around 9 feet Sunday evening. $$  409 FZUS61 KBUF 230203 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1003 PM EDT Sat Aug 22 2026 SLZ022-024-230900- Saint Lawrence River from Cape Vincent to Saint Regis 1003 PM EDT Sat Aug 22 2026 .OVERNIGHT...Southeast winds 5 to 15 knots. A chance of showers and thunderstorms. Showers likely with a chance of thunderstorms late. .SUNDAY...Southeast winds 10 to 15 knots becoming southwest. Showers with a chance of thunderstorms. .SUNDAY NIGHT...Southwest winds 10 to 15 knots. A chance of showers in the evening, then showers overnight. .MONDAY...Southwest winds 5 to 15 knots. Showers in the morning, then showers with a chance of thunderstorms in the afternoon. .MONDAY NIGHT...Southwest winds 5 to 10 knots. Showers likely in the evening, then a chance of showers overnight. .TUESDAY...West winds 5 to 10 knots becoming light and variable. A chance of showers and thunderstorms. .WEDNESDAY...Southwest winds less than 10 knots becoming south. Partly cloudy. .THURSDAY...South winds 10 knots or less. A chance of showers during the day, then showers likely Thursday night. Winds and waves higher in and near thunderstorms. $$  426 FZUS63 KMKX 230222 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 922 PM CDT Sat Aug 22 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... Isolated showers and storms will remain possible over the lake tonight into at least early Sunday, with a small chance for an isolated waterspout through tonight. Otherwise, breezy north to northwest winds will persist into Sunday between deepening low pressure around 29.7 inches over the eastern Great Lakes and high pressure of 30.2 inches building in from the northwest. Winds will eventually become lighter by mid-day Monday, persisting into Tuesday as the high moves overhead. Breezy southerly winds will then develop later Tuesday into Wednesday as the high shifts eastward ahead of an approaching low. LMZ261-362-364-366-563-565-567-868-230930- 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- 922 PM CDT Sat Aug 22 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TONIGHT...North winds 15 to 25 kt becoming northwest. Slight chance of waterspouts. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...Northwest winds 15 to 25 kt becoming north to 30 kt. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY NIGHT...North winds to 30 kt becoming northwest 15 to 25 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. .MONDAY...Northwest winds to 30 kt diminishing to 15 to 25 kt. Waves 2 to 4 ft subsiding to 1 to 3 ft. .MONDAY NIGHT...North winds 15 to 25 kt backing to west 5 to 10 kt overnight. Waves 1 to 3 ft subsiding to 1 to 2 ft. .TUESDAY...Southwest winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Waves 1 ft or less building to 2 to 4 ft. .TUESDAY NIGHT...South winds 15 to 25 kt diminishing to 10 to 20 kt. Chance of showers. Waves 2 to 4 ft. .WEDNESDAY...Southwest winds 15 to 25 kt becoming south to 30 kt. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north 15 to 25 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-230930- 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- 922 PM CDT Sat Aug 22 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TONIGHT...North winds 10 to 20 kt. Slight chance of showers late this evening. Slight chance of waterspouts. Waves 2 to 4 ft building to 3 to 5 ft. .SUNDAY...Northwest winds 15 to 25 kt becoming north. Slight chance of waterspouts in the morning. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to 15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. .MONDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. .MONDAY NIGHT...Northeast winds 10 to 15 kt veering to south. Waves 1 to 3 ft. .TUESDAY...South winds 10 to 15 kt increasing to 15 to 25 kt in the afternoon. Waves 1 to 2 ft building to 2 to 4 ft. .TUESDAY NIGHT...South winds 15 to 25 kt becoming southwest 10 to 20 kt. Waves 2 to 4 ft. .WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. $$ LMZ761-230930- MAFOR 2304/ MICHIGAN NORTH 11840 13730 12740 12840. Waves 3 to 6 feet. MICHIGAN SOUTH 12820 11720 12730 12830 11820. Waves 1 to 3 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet Sunday. Waves 3 to 5 feet subsiding to 2 to 4 feet Sunday evening. $$ DDV Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes