780 FZUS63 KMQT 160800 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 400 AM EDT Thu Apr 16 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... Weak ridging of around 29.8 inches persists over Lake Superior today and tonight, then expect height falls into Friday morning before troughing averaging 29.5 inches moves across the lake Friday evening and Saturday morning. Ridging builds over Lake Superior the remainder of Saturday and throughout Sunday, reaching about 30.3 inches Monday morning. This gives way quickly to troughing Monday evening as a low swings southeast through Ontario toward James Bay, decreasing to around 29.6 by Monday evening. LSZ162-162000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 400 AM EDT Thu Apr 16 2026 /300 AM CDT Thu Apr 16 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING... .EARLY THIS MORNING...Northeast winds less than 10 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...Southwest winds 5 to 15 knots backing east late. Widespread dense fog through early afternoon, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 10 to 20 knots. Patchy fog. A slight chance of rain and snow showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...East winds 10 to 20 knots backing northeast in the afternoon, then backing northwest late. Patchy fog through early afternoon. Rain showers and a chance of thunderstorms by mid afternoon. Waves 1 to 3 feet. .FRIDAY NIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots after midnight. A chance of rain showers, possibly mixed with snow and thunderstorms through midnight. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY...West winds 20 to 30 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming west 10 to 20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. $$ LSZ263-162000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 400 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .EARLY THIS MORNING...Southwest winds less than 10 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...Southwest winds less than 10 knots increasing to 5 to 15 knots in the afternoon, then backing east late. Widespread dense fog through early afternoon, then areas of dense fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots. Patchy fog. A slight chance of rain showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...East winds 10 to 20 knots becoming south 15 to 25 knots late. Patchy fog through early afternoon. A chance of showers and thunderstorms by mid afternoon. Waves building to 3 to 5 feet occasionally to 7 feet. .FRIDAY NIGHT...West winds 20 to 30 knots. Rain showers likely and a slight chance of thunderstorms through midnight, then a slight chance of rain showers, snow showers and sleet after midnight. Waves building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West winds 20 to 30 knots increasing to gales to 35 knots by mid afternoon. Waves building to 7 to 10 feet occasionally to 13 feet. .SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to calm to 2 feet. .MONDAY...South winds 10 to 20 knots increasing to 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. $$ LSZ264-162000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 400 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .EARLY THIS MORNING...West winds less than 10 knots. Areas of dense fog. Waves calm to 2 feet. .TODAY...Southwest winds less than 10 knots veering west in the afternoon, then becoming east 5 to 15 knots late. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast after midnight, then increasing to 10 to 20 knots late. Areas of dense fog. A slight chance of rain showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Patchy fog through early afternoon. A chance of rain showers and a slight chance of thunderstorms by mid afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 35 knots becoming west 20 to 30 knots after midnight. Rain showers and a slight chance of thunderstorms through midnight, then a chance of rain showers after midnight. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 35 knots. Waves building to 5 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. .MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 4 to 7 feet occasionally to 9 feet. $$ LSZ265-162000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 400 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Areas of dense freezing fog and dense fog. Waves calm to 2 feet. .TODAY...West winds 5 to 15 knots backing east in the afternoon. Widespread dense freezing fog through early afternoon. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to 25 knots late. Areas of dense fog. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 30 knots with a few gale force gusts to 35 knots possible. Patchy fog through early afternoon. A slight chance of rain showers by mid afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 35 knots veering west after midnight. Rain showers and a slight chance of thunderstorms through midnight, then a chance of rain showers after midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...West gales to 40 knots. Waves building to 6 to 9 feet occasionally to 11 feet. .SATURDAY NIGHT...Northwest gales to 40 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Southeast winds 10 to 20 knots becoming south 20 to 30 knots. Waves subsiding to calm to 2 feet, then building to 3 to 6 feet occasionally to 8 feet. $$ LSZ266-162000- 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- 400 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Areas of dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots veering east late. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots becoming southeast 10 to 20 knots after midnight. Areas of dense fog. Waves building to 1 to 3 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots in the afternoon, then becoming south to 30 knots with a few gale force gusts to 40 knots possible late. Patchy fog through early afternoon. Waves building to 6 to 9 feet occasionally to 11 feet. .FRIDAY NIGHT...South gales to 40 knots becoming west gales to 35 knots after midnight. A chance of thunderstorms through midnight. Rain showers. Waves building to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 40 knots. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...Northwest gales to 40 knots. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...South winds 10 to 20 knots increasing to gales to 35 knots. Waves subsiding to 1 to 3 feet, then building to 5 to 8 feet occasionally to 10 feet. $$ LSZ267-162000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 400 AM EDT Thu Apr 16 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .EARLY THIS MORNING...Northwest winds 5 to 15 knots. Widespread dense fog. Waves calm to 2 feet. .TODAY...Northwest winds 5 to 15 knots. Patchy dense fog. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots veering southeast after midnight. Areas of dense fog. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 20 to 30 knots. Patchy fog through early afternoon. Waves building to 4 to 7 feet occasionally to 9 feet. .FRIDAY NIGHT...Southeast gales to 35 knots veering south after midnight. Rain showers and a slight chance of thunderstorms. Waves building to 5 to 8 feet occasionally to 10 feet. .SATURDAY...West gales to 40 knots. A chance of rain showers. Waves building to 10 to 14 feet occasionally to 18 feet. .SATURDAY NIGHT...West gales to 35 knots veering northwest after midnight. A chance of snow showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots. Waves subsiding to 1 to 3 feet, then building to 5 to 8 feet occasionally to 10 feet. $$ LSZ261-161400- MAFOR 1609/ Superior West 11804 11404 11504 12200 11110 11110 19114 11210. Waves 2 feet or less. Superior North Central 14604 11304 11214 11324 11314. Waves 2 feet or less. Superior South Central 12704 11604 11104 11210 12314 11324. Waves 2 feet or less. Superior East 12704 12700 11800 11200 11304 11314. 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  764 FZUS61 KBUF 160809 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 409 AM EDT Thu Apr 16 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 will move across the central Great Lakes today before reaching southern Quebec tonight, then drift off the New England coast by Friday night. A 30.0 inch high is then forecast to build from the central Great Lakes Friday to the lower Great Lakes Saturday morning, then off the east coast Saturday night. A 29.3 inch surface low to the north of Lake Superior Saturday will deepen to 28.9 inches by Sunday, with a trailing cold front crossing the Lake Saturday night. A 30.4 inch surface high will push from the Plains to the Upper Ohio Valley from Sunday through Monday. The high is expected to move off the Mid-Atlantic coast Tuesday. LOZ062-161500- Lake Ontario open waters from the Niagara River to Hamlin Beach- 409 AM EDT Thu Apr 16 2026 .TODAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Patchy fog this morning. A chance of showers early, then showers likely late this morning. Showers with a chance of thunderstorms this afternoon. Waves 1 to 3 feet building to 2 to 4 feet. .TONIGHT...Southwest winds 15 to 20 knots becoming northwest and diminishing to 5 to 10 knots. Showers likely with a chance of thunderstorms early, then a chance of showers. Patchy fog from late evening on. Waves 2 to 4 feet subsiding to 1 to 2 feet. .FRIDAY...Northwest winds 10 knots or less becoming south. Patchy fog in the morning. Waves 1 foot or less. .FRIDAY NIGHT...Southeast winds 10 knots or less becoming east. Waves 1 foot or less. .SATURDAY...Southeast winds 10 to 15 knots becoming west 15 to 20 knots. Showers. Waves 2 feet or less building to 2 to 4 feet. .SUNDAY...West winds 15 to 25 knots becoming northwest. A chance of rain showers. Waves 3 to 6 feet building to 4 to 7 feet. Waves occasionally around 9 feet. .MONDAY...Northwest winds 15 to 25 knots becoming southwest and diminishing to 10 to 15 knots. Waves 4 to 7 feet subsiding to 1 to 3 feet. Waves occasionally around 9 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-161500- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 409 AM EDT Thu Apr 16 2026 .TODAY...Southwest winds 5 to 15 knots. Patchy dense fog this morning. A chance of showers early, then showers late this morning. Showers with a chance of thunderstorms this afternoon. Some thunderstorms may produce gusty winds late. Waves 1 to 3 feet. .TONIGHT...Southwest winds 5 to 15 knots becoming northwest. Showers with a chance of thunderstorms early, then showers likely late in the evening. A chance of showers after midnight. Patchy fog from late evening on. Some thunderstorms may produce gusty winds early. Waves 1 to 3 feet. .FRIDAY...Northwest winds 10 knots or less becoming west. Patchy fog in the morning. Waves 2 feet or less. .FRIDAY NIGHT...Southwest winds 10 knots or less becoming southeast. Waves 1 foot or less. .SATURDAY...Southeast winds 10 to 15 knots becoming west 15 to 20 knots. Showers likely. Waves 1 to 3 feet building to 3 to 5 feet. .SUNDAY...West winds 15 to 25 knots becoming northwest to 30 knots. Rain showers likely during the day, then a chance of rain showers Sunday night. Waves 3 to 6 feet building to 5 to 9 feet. Waves occasionally around 11 feet. .MONDAY...Northwest winds 15 to 25 knots becoming west. Waves 5 to 9 feet subsiding to 3 to 5 feet. Waves occasionally around 11 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-161500- MAFOR 1609/ ONTARIO WEST 1/2 11500 11410 11510 11526 11516 11610 11600 11700. A chance of thunderstorms this afternoon and evening. Waves 1 to 3 feet building to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight. ONTARIO EAST 1/2 11500 19504 11400 19404 11400 12516 11510 11600 11700. A chance of thunderstorms this afternoon and evening. Waves 2 feet or less today. Waves 1 to 3 feet tonight. $$  630 FZUS61 KBUF 160810 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 410 AM EDT Thu Apr 16 2026 SLZ022-024-161500- Saint Lawrence River from Cape Vincent to Saint Regis 410 AM EDT Thu Apr 16 2026 .TODAY...East winds 10 knots or less becoming southwest. Patchy fog this morning. Showers late this morning. Showers with a chance of thunderstorms this afternoon. .TONIGHT...Southwest winds 10 knots or less becoming north. Showers likely with a chance of thunderstorms early, then showers likely late in the evening. A chance of showers after midnight. Patchy fog from late evening on. .FRIDAY...North winds less than 10 knots. A chance of showers in the morning. .FRIDAY NIGHT...Light and variable winds. Mainly clear in the evening, then becoming partly cloudy. .SATURDAY...Southeast winds 10 to 15 knots becoming southwest. A chance of showers during the day, then showers Saturday night. .SUNDAY...West winds 5 to 15 knots. Rain showers likely during the day, then a chance of rain showers Sunday night. .MONDAY...Northwest winds 5 to 10 knots becoming west. Partly cloudy. Winds and waves higher in and near thunderstorms. $$  619 FZUS63 KMKX 160833 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 333 AM CDT Thu Apr 16 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... A stationary front will remains stalled the middle portion of the lake. It will slowly sink south to the southern end of the lake by noon today. While the front will be departing, light winds will support continued dense fog potential through tonight. Marine Dense Fog Advisory is now in effect until 7 AM Friday morning. Winds will become light and variable briefly tonight as a weak ridge passes over the lake, with winds then becoming southerly and breezy Friday ahead of low pressure of 29.6 inches approaching from the west. Gusty northwest winds then return following a cold front Friday night. Thunderstorms are possible Friday evening into Saturday morning. Some storms could be strong to severe, with gusty winds and large hail being the primary concerns. LMZ261-362-364-366-563-565-567-868-161515- 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- 333 AM CDT Thu Apr 16 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT FRIDAY... .TODAY...North winds 5 to 10 kt becoming northwest. Chance of rain showers and slight chance of thunderstorms this morning. Areas of dense fog. Waves 1 to 2 ft. .TONIGHT...Southwest winds 10 to 15 kt becoming south 5 to 10 kt. Areas of fog in the evening, then areas of dense fog overnight. Waves 1 to 2 ft. .FRIDAY...South winds 10 to 15 kt becoming southeast 15 to 25 kt. Areas of dense fog in the morning. Waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft. .FRIDAY NIGHT...South winds to 30 kt. Rain showers with a chance of thunderstorms. Waves 6 to 9 ft occasionally to 12 ft. .SATURDAY...West winds 15 to 25 kt. Rain showers in the morning, then chance of rain showers in the afternoon. Waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft occasionally to 8 ft. .SATURDAY NIGHT...Northwest winds 15 to 25 kt increasing to 30 kt. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...Northwest winds to 30 kt. Waves 4 to 7 ft occasionally to 9 ft. .MONDAY...Southwest winds 10 to 20 kt becoming south. Waves 3 to 5 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-161515- 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- 333 AM CDT Thu Apr 16 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT FRIDAY... .TODAY...West winds 10 to 20 kt veering to north 10 to 15 kt. Areas of dense fog. Chance of rain showers and slight chance of thunderstorms this morning, then chance of rain showers this afternoon. Waves 1 to 3 ft. .TONIGHT...North winds 10 to 15 kt veering to south. Areas of fog in the evening, then areas of dense fog overnight. Waves 1 to 3 ft. .FRIDAY...Southeast winds 10 to 15 kt increasing to 15 to 25 kt. Areas of dense fog in the morning. Waves 1 to 2 ft building to 4 to 6 ft occasionally to 8 ft. .FRIDAY NIGHT...South winds to 30 kt becoming southwest 15 to 25 kt. Rain showers with a chance of thunderstorms. Waves 5 to 8 ft occasionally to 10 ft. .SATURDAY...West winds 15 to 25 kt. Rain showers in the morning, then chance of rain showers in the afternoon. Waves 5 to 8 ft occasionally to 10 ft. .SATURDAY NIGHT...West winds 15 to 25 kt. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...Northwest winds 15 to 25 kt. Waves 4 to 7 ft occasionally to 9 ft. .MONDAY...East winds 10 to 20 kt becoming southeast. Waves 3 to 5 ft. $$ LMZ761-161515- MAFOR 1610/ MICHIGAN NORTH 11804 12814 11714 11610 11400 12404. A chance of rain showers this morning. Waves 2 feet or less. MICHIGAN SOUTH 11524 11624 11724 11714 12810 11504 11404. A chance of rain showers today. Waves 1 to 3 feet today. Waves 2 feet or less tonight. $$ Quigley Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes