587 FZUS63 KMQT 221401 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1000 AM 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. LSZ162-222000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1000 AM EDT Sat Aug 22 2026 /900 AM CDT Sat Aug 22 2026/ .REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots. Waves calm to 2 feet. .SUNDAY...North winds 5 to 15 knots veering south in the afternoon. Waves calm to 2 feet. .SUNDAY NIGHT...West 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 southeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots becoming southeast less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots veering west. A chance of showers and thunderstorms. Waves calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves calm to 2 feet. $$ LSZ263-222000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots in the afternoon, then diminishing to 5 to 15 knots late. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after midnight. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots veering southwest. A chance of showers. A chance of thunderstorms. Showers likely. Waves calm to 2 feet. .WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to 15 knots. A chance of showers. Waves calm to 2 feet. $$ LSZ264-222000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet building to 1 to 3 feet, then subsiding to calm to 2 feet. .TONIGHT...North winds 10 to 20 knots increasing to 15 to 25 knots after midnight, then diminishing to 10 to 20 knots late. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots backing northwest late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves 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 backing south after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south. A chance of thunderstorms. Showers likely. Waves calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots veering northwest. A chance of showers. Waves calm to 2 feet. $$ LSZ265-222000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 20 to 30 knots. Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots becoming south 15 to 25 knots. Showers likely and a chance of thunderstorms. Waves calm to 2 feet. .WEDNESDAY...West winds 15 to 25 knots veering northwest. A chance of showers. Waves calm to 2 feet. $$ LSZ266-222000- 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 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon. Patchy fog by late morning. Sprinkles by late morning. Waves 2 to 4 feet building to 3 to 6 feet occasionally to 8 feet. .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 increasing to 30 knots with a few gale force gusts to 35 knots possible in the afternoon, then backing northwest late. Waves building to 4 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming north 15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...North winds 10 to 20 knots backing northwest by mid afternoon. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves calm to 2 feet. .TUESDAY...South winds 10 to 20 knots. Showers likely and a chance of thunderstorms. Waves building to 1 to 3 feet. .WEDNESDAY...West winds 10 to 20 knots veering northwest. Showers likely. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. $$ LSZ267-222000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1000 AM EDT Sat Aug 22 2026 .REST OF TODAY...Northwest winds 10 to 20 knots increasing to 20 to 30 knots. Patchy fog. A slight chance of showers. Waves calm to 2 feet building to 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. A slight chance of showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest in the afternoon, then increasing to 30 knots with a few gale force gusts to 35 knots possible late. A slight chance of showers. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...Northwest winds 15 to 25 knots. Waves subsiding to 2 to 4 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...Southeast winds 5 to 15 knots veering south. Showers likely. Waves building to 1 to 3 feet. .WEDNESDAY...South winds 10 to 20 knots veering west. Showers likely. A chance of thunderstorms. A chance of showers. Waves subsiding to calm to 2 feet. $$ LSZ261-222000- MAFOR 2215/ Superior West 11720 13710 14820. Waves 2 feet or less. Superior North Central 14720 14830. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday morning. Superior South Central 14740 14840. Waves 2 to 4 feet building to 3 to 5 feet this afternoon. Waves 3 to 5 feet tonight. Waves 4 to 7 feet Sunday morning. Superior East 11710 11730 12740 13830 11840. Waves 1 to 3 feet building to 2 to 4 feet this afternoon. Waves 3 to 6 feet tonight and Sunday morning. $$ 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  675 FZUS61 KBUF 221402 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 AM 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 high pressure ridge averaging 30.1 inches exits toward the Canadian Maritimes today. Elsewhere, 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. LOZ062-222100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 AM EDT Sat Aug 22 2026 .THIS AFTERNOON...Southeast winds 5 to 10 knots becoming east. A chance of showers and thunderstorms late. Waves around 1 foot. .TONIGHT...Southeast winds 5 to 15 knots becoming southwest. Showers with a chance of thunderstorms through the early overnight, then showers likely late. A chance of waterspouts after midnight. Waves 1 to 2 feet. .SUNDAY...West winds 15 to 25 knots. A chance of waterspouts. Showers likely in the morning, then 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 25 knots. A chance of waterspouts. A chance of showers and thunderstorms in the evening, then showers likely overnight. Waves 4 to 6 feet. .MONDAY...West winds 15 to 25 knots. A chance of waterspouts. Showers during the day, then a chance of showers Monday night. Waves 5 to 8 feet subsiding to 3 to 5 feet. Waves occasionally around 10 feet. .TUESDAY...West winds 15 to 20 knots diminishing to less than 10 knots. A chance of waterspouts during the day. A chance of showers 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. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-222100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 AM EDT Sat Aug 22 2026 .THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves 1 to 3 feet subsiding to 1 foot or less. .TONIGHT...Southeast winds 10 to 15 knots becoming south and increasing to 15 to 25 knots. Showers likely with a chance of thunderstorms. A chance of waterspouts after midnight. 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. Waves 3 to 5 feet building to 3 to 6 feet. .SUNDAY NIGHT...West winds 15 to 25 knots becoming southwest. A chance of waterspouts. Showers likely 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 to 30 knots becoming west 15 to 25 knots. A chance of waterspouts. Showers. Waves 4 to 7 feet building to 6 to 9 feet, then subsiding to 4 to 7 feet. Waves occasionally around 11 feet. .TUESDAY...West winds 15 to 20 knots diminishing to 5 to 15 knots. A chance of waterspouts during the day. Showers likely 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. Winds and waves higher in and near thunderstorms. $$ LOZ061-222100- MAFOR 2215/ ONTARIO WEST 1/2 11300 12200 11406 12416 11516 11626. A chance of waterspouts overnight and Sunday morning. A chance of thunderstorms this evening. Waves 1 to 3 feet this afternoon and tonight. Waves 1 to 3 feet building to 2 to 4 feet Sunday morning. ONTARIO EAST 1/2 11310 11300 11310 11410 11420 12436 11426. A chance of waterspouts overnight and Sunday morning. A chance of thunderstorms this evening. Waves 2 feet or less this afternoon. Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Sunday morning. $$  685 FZUS61 KBUF 221403 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1002 AM EDT Sat Aug 22 2026 SLZ022-024-222100- Saint Lawrence River from Cape Vincent to Saint Regis 1002 AM EDT Sat Aug 22 2026 .THIS AFTERNOON...Southeast winds 5 to 10 knots. Mostly sunny. .TONIGHT...Southeast winds 10 knots or less increasing to 10 to 15 knots. A chance of showers after midnight. A chance of showers and thunderstorms late. .SUNDAY...Southeast winds 5 to 15 knots becoming southwest. Showers with a chance of thunderstorms. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. Showers likely with a chance of thunderstorms in the evening, then showers likely overnight. .MONDAY...Southwest winds 5 to 15 knots. Showers. .TUESDAY...West winds 5 to 10 knots becoming light and variable. A chance of showers. .WEDNESDAY...Southwest winds 10 knots or less becoming south. Partly cloudy. Winds and waves higher in and near thunderstorms. $$  926 FZUS63 KMKX 221408 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 908 AM 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... 29.8 inch low pressure is centered over the southern Hudson Bay this morning, resulting in generally northeast winds across the open waters of Lake Michigan. These winds will continue into this evening as a weak cold front moves across the lake and 30.2 inch high pressure builds into the northern Great Plains. Isolated showers and thunderstorms are possible along the passing front this afternoon & evening. Severe weather potential is low in this activity, though an isolated stronger storm with gusty winds or a waterspout can't be entirely ruled out. Will be watching radar trends for any potential marine weather statements or special marine warnings through this evening. Northwest winds will continue through the day Sunday, ultimately weakening by Sunday night as the aforementioned area of high pressure approaches Lake Michigan. Light and variable winds will continue Monday with high pressure lingering in the vicinity. The high will shift east into Ontario by Tuesday, resulting in a south-southwest wind shift across the waters. 29.7 inch low pressure will approach from the northern Great Plains Tuesday night into Wednesday, reinforcing the south- southwesterly wind pattern. The low will cross Lake Michigan during the second half of the day Wednesday, bringing a northwest wind shift. Gales are not expected as this occurs. Showers and thunderstorms will accompany the approaching/passing surface low Tuesday night into Wednesday afternoon. It remains too early to tell if any of these storms could be severe, with trends being monitored into the beginning of next week. LMZ261-362-364-366-563-565-567-868-222115- 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 Sat Aug 22 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TODAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt. Slight chance of showers and thunderstorms this afternoon. Waves 2 to 4 ft. .TONIGHT...North winds to 30 kt diminishing to 15 to 25 kt. Slight chance of showers and thunderstorms in the evening. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...Northwest winds 15 to 25 kt becoming north to 30 kt. Waves 4 to 7 ft occasionally to 9 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 15 to 25 kt becoming north. Waves 2 to 4 ft. .MONDAY NIGHT...West winds 10 to 20 kt becoming southwest 5 to 10 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft. .TUESDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Waves 1 to 2 ft building to 2 to 4 ft. .WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Chance of showers. Waves 3 to 5 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-222115- 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 Sat Aug 22 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TODAY...Northwest winds 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft. .TONIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt. Slight chance of showers and thunderstorms in the evening, then slight chance of showers overnight. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...Northwest winds 15 to 25 kt becoming north to 30 kt. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY NIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .MONDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. .MONDAY NIGHT...East winds 10 to 15 kt veering to south. Waves 1 to 3 ft. .TUESDAY...South winds 10 to 20 kt increasing to 15 to 25 kt. Waves 1 to 2 ft building to 1 to 3 ft. .WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Chance of showers. Waves 3 to 5 ft. $$ LMZ761-222115- MAFOR 2216/ MICHIGAN NORTH 11720 11730 11830 11840 12830 11730 11830. Waves 1 to 3 feet building to 2 to 4 feet this afternoon. Waves 3 to 6 feet tonight and Sunday morning. MICHIGAN SOUTH 12720 13830 11820 12730. Waves 3 to 5 feet this afternoon. Waves 2 to 4 feet building to 3 to 5 feet tonight. Waves 3 to 6 feet Sunday morning. $$ Quigley Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes