397 FZUS61 KBUF 151410 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1009 AM EDT Wed Apr 15 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 weaken to around 29.8 as it slides east across the lake early this morning. Another 29.6 inch low will move into the central Great Lakes Wednesday night before reaching southern Quebec Thursday night, 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. LOZ062-152100- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1009 AM EDT Wed Apr 15 2026 .REST OF TODAY...Southwest winds 10 to 15 knots. Patchy fog. A chance of showers and thunderstorms late. Waves 1 to 3 feet. .TONIGHT...Southwest winds 10 to 15 knots becoming south. Patchy fog. A chance of showers and thunderstorms in the evening. Showers likely late. Waves 1 to 3 feet. .THURSDAY...South winds 10 to 15 knots becoming southwest. Patchy fog. Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 3 feet. .THURSDAY NIGHT...Southwest winds 10 to 15 knots becoming west. Patchy fog in the evening. Showers in the evening, then showers likely overnight. Waves 1 to 3 feet. .FRIDAY...Northwest winds 10 knots or less becoming southeast. A chance of showers during the day. Waves 1 foot or less. .SATURDAY...Southeast winds 5 to 10 knots becoming west and increasing to 15 to 20 knots. Showers likely. Waves 1 foot or less building to 3 to 6 feet. .SUNDAY...West winds 20 to 25 knots becoming northwest. A chance of rain showers. Waves 5 to 8 feet. Waves occasionally around 10 feet. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-152100- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1009 AM EDT Wed Apr 15 2026 .REST OF TODAY...South winds 5 to 10 knots becoming west. A chance of showers late this morning. Patchy fog. Waves 2 feet or less. .TONIGHT...South winds 5 to 10 knots. Patchy fog. A chance of showers through the early overnight, then showers likely late. Waves 2 feet or less. .THURSDAY...South winds 5 to 10 knots becoming southwest. Patchy fog. Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Waves 1 to 2 feet. .THURSDAY NIGHT...Southwest winds 5 to 10 knots becoming west. Patchy fog in the evening. Showers with a chance of thunderstorms in the evening, then showers likely overnight. Waves 1 to 2 feet. .FRIDAY...Northwest winds 10 knots or less becoming southeast. A chance of showers during the day. Waves 1 foot or less. .SATURDAY...Southeast winds 5 to 15 knots becoming southwest and increasing to 15 to 25 knots. Showers likely. Waves 1 foot or less building to 4 to 7 feet. Waves occasionally around 9 feet. .SUNDAY...West winds to 30 knots. A chance of rain showers. Waves 5 to 9 feet building to 7 to 10 feet. Waves occasionally around 13 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-152100- MAFOR 1515/ ONTARIO WEST 1/2 15510 12416. Waves 1 to 3 feet. ONTARIO EAST 1/2 11500 11600 11500 11400 11500 12400 11406. Waves 2 feet or less. $$  805 FZUS61 KBUF 151411 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1011 AM EDT Wed Apr 15 2026 SLZ022-024-152100- Saint Lawrence River from Cape Vincent to Saint Regis 1011 AM EDT Wed Apr 15 2026 .REST OF TODAY...Northeast winds 10 knots or less. Showers. Patchy fog late this morning. Patchy fog late. .TONIGHT...Northeast winds less than 10 knots becoming east. Areas of fog. A chance of showers in the evening, then showers likely after midnight. .THURSDAY...East winds 10 knots or less becoming south. Patchy fog in the morning. Showers likely in the morning, then showers in the afternoon. .THURSDAY NIGHT...South winds less than 10 knots becoming north. Showers with a chance of thunderstorms in the evening, then showers likely overnight. .FRIDAY...North winds 10 knots or less becoming east. Showers likely during the day. .SATURDAY...Southeast winds 5 to 15 knots becoming southwest. A chance of showers during the day, then showers likely Saturday night. .SUNDAY...Southwest winds 10 to 15 knots becoming west. Rain showers likely during the day, then rain showers likely with a chance of snow showers Sunday night. Winds and waves higher in and near thunderstorms. $$  668 FZUS63 KMQT 151426 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1026 AM EDT Wed Apr 15 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 to 29.9 inches settles over the lake today before another low from the Central Plains lifts through Lower Michigan or closer to the Straits at around 29.7 inches. Ridging increases to 29.8 inches over Lake Superior later in the day Thursday before troughing of 29.4 to 29.6 inches moves across the lake Friday through Saturday. This deepens further to 29.0 inches over far northern Quebec by Sunday morning. 30.2 inch ridging builds in over Lake Superior for Sunday night. LSZ162-152000- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1026 AM EDT Wed Apr 15 2026 /926 AM CDT Wed Apr 15 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots veering northeast in the afternoon. Waves calm to 2 feet. .TONIGHT...East winds 5 to 15 knots backing northeast late. Patchy fog through midnight, then areas of dense fog after midnight. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east in the afternoon. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Northeast winds 15 to 25 knots. A chance of rain showers. A chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...North winds 15 to 25 knots becoming northwest 20 to 30 knots after midnight. Rain showers through midnight, then a chance of rain showers, possibly mixed with snow after midnight. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. .SATURDAY...West winds 20 to 30 knots veering northwest. A chance of snow showers. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. $$ LSZ263-152000- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1026 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...North winds less than 10 knots veering northeast late. Patchy fog by late morning. Waves calm to 2 feet. .TONIGHT...East winds less than 10 knots. Patchy fog through midnight, then areas of dense fog after midnight. Waves calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots increasing to 5 to 15 knots in the afternoon, then veering east late. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of rain showers and a slight chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Northeast winds 20 to 30 knots backing northwest after midnight. Rain showers through midnight, then a chance of rain showers, possibly mixed with snow after midnight. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...West gales to 35 knots veering northwest. A chance of snow showers. Waves building to 8 to 11 feet occasionally to 14 feet. .SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to 20 knots. Waves subsiding to 1 to 3 feet. $$ LSZ264-152000- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1026 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...North winds less than 10 knots. Patchy fog by late morning. Waves calm to 2 feet. .TONIGHT...Northeast winds less than 10 knots veering south after midnight. Patchy fog. Waves calm to 2 feet. .THURSDAY...Northeast winds less than 10 knots veering south in the afternoon, then becoming east 5 to 15 knots late. Patchy dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots backing east after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A slight chance of rain showers by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...Southeast winds 15 to 25 knots becoming north 20 to 30 knots after midnight. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet. .SATURDAY...Northwest gales to 40 knots. A chance of rain showers. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 10 to 20 knots. Waves subsiding to 2 to 4 feet. $$ LSZ265-152000- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1026 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots veering north late. Areas of dense fog by late morning, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...Northeast winds 5 to 15 knots veering southeast after midnight, then backing north late. Areas of fog. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots veering east in the afternoon, then increasing to 10 to 20 knots late. Patchy fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. A slight chance of rain showers by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South gales to 35 knots. Rain showers. Waves building to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SATURDAY...West gales to 40 knots veering northwest. A chance of rain showers. A chance of snow showers. Waves building to 9 to 12 feet occasionally to 15 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 15 to 25 knots. Waves subsiding to 2 to 4 feet. $$ LSZ266-152000- 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- 1026 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots veering north in the afternoon. Areas of dense fog by late morning, then patchy fog by mid afternoon. Waves calm to 2 feet. .TONIGHT...North winds 5 to 15 knots. Patchy fog. Waves calm to 2 feet. .THURSDAY...Northeast winds 5 to 15 knots backing north in the afternoon, then veering east late. Patchy fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to 30 knots by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South gales to 35 knots. Rain showers. Waves building to 4 to 8 feet occasionally to 10 feet. .SATURDAY...Northwest gales to 40 knots. A chance of rain showers. A chance of snow showers. Waves building to 12 to 17 feet occasionally to 21 feet. .SUNDAY...Northwest gales to 40 knots diminishing to 15 to 25 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet. $$ LSZ267-152000- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1026 AM EDT Wed Apr 15 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING... .REST OF TODAY...Northwest winds 5 to 15 knots. Areas of dense fog. Waves calm to 2 feet. .TONIGHT...Northwest winds 5 to 15 knots backing southwest after midnight, then veering north late. Areas of dense fog. A slight chance of rain showers. Waves calm to 2 feet. .THURSDAY...North winds 5 to 15 knots backing northwest in the afternoon. Areas of dense fog through early afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...North winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Southeast winds 20 to 30 knots. A chance of rain showers through midnight. Rain showers after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SATURDAY...West gales to 35 knots. Rain showers likely. A chance of snow showers. Waves building to 12 to 17 feet occasionally to 21 feet. .SUNDAY...Northwest gales to 35 knots diminishing to 15 to 25 knots. A chance of snow showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet. $$ LSZ261-152000- MAFOR 1515/ Superior West 11800 12100 12200 11204 12104. Waves 1 foot or less. Superior North Central 13800 11100 11200 11400 11500 11100. Waves 1 foot or less. Superior South Central 11714 11803 11800 11100 11203 11400 12100. Waves 1 foot or less. Superior East 11804 11803 11703 11803 11704 12804 11104. 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  969 FZUS63 KMKX 151433 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 933 AM CDT Wed Apr 15 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 remain parked over the middle third of the lake into this afternoon, slowly sinking south to the southern end of the lake by Thursday morning. Winds will remain southerly south of the front and modestly breezy, while winds north of the front will remain light and variable to northerly during this time. The front will clear the lake as a cold front Friday, before low pressure of 29.6 inches approaches from the west. A Marine Dense Fog Advisory continues until Thursday morning. Additional thunderstorms are forecast over the southern third of Lake Michigan today. A few storms could be severe with large hail being the primary concern. Additional storms are possible Friday into Saturday, with a few stronger storms possible. LMZ261-362-364-366-563-565-567-868-152115- 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- 933 AM CDT Wed Apr 15 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT THURSDAY... .REST OF TODAY...North winds 5 to 10 kt increasing to 10 to 15 kt. Areas of dense fog. Chance of rain showers late this morning, then slight chance of rain showers and thunderstorms this afternoon. Waves 1 to 3 ft. .TONIGHT...Northeast winds 5 to 10 kt increasing to 10 to 15 kt. Areas of dense fog in the evening, then widespread dense fog overnight. Chance of rain showers and slight chance of thunderstorms. Waves 1 to 2 ft. .THURSDAY...Northeast winds 10 to 20 kt becoming north 10 to 15 kt. Widespread dense fog in the morning, then patchy fog in the afternoon. Chance of rain showers. Waves 1 to 2 ft. .THURSDAY NIGHT...North winds 5 to 10 kt becoming northeast. Waves 1 to 2 ft. .FRIDAY...Southeast winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 2 ft building to 3 to 5 ft. .FRIDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SATURDAY...South winds to 30 kt becoming southwest. Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...Northwest winds to 30 kt. Waves 7 to 10 ft occasionally to 13 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-152115- 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- 933 AM CDT Wed Apr 15 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT THURSDAY... .REST OF TODAY...Southwest winds 10 to 20 kt becoming south. Areas of dense fog. Rain showers likely with a chance of thunderstorms late this morning, then chance of rain showers and thunderstorms this afternoon. Waves 2 to 4 ft. .TONIGHT...Southeast winds 10 to 15 kt. Widespread dense fog. Rain showers with a chance of thunderstorms in the evening, then rain showers likely with slight chance of thunderstorms overnight. Waves 1 to 3 ft. .THURSDAY...South winds 10 to 20 kt veering to northwest 10 to 15 kt. Patchy dense fog in the morning, then patchy fog in the afternoon. Rain showers likely. Waves 1 to 3 ft. .THURSDAY NIGHT...North winds 5 to 10 kt. Waves 1 to 2 ft. .FRIDAY...Southeast winds 5 to 10 kt increasing to 10 to 20 kt in the afternoon. Waves 1 to 2 ft building to 3 to 5 ft. .FRIDAY NIGHT...Southeast winds 15 to 25 kt becoming south to 30 kt. Rain showers with a chance of thunderstorms. Waves 4 to 7 ft occasionally to 9 ft. .SATURDAY...South winds to 30 kt becoming west. Chance of rain showers. Waves 4 to 7 ft occasionally to 9 ft. .SUNDAY...West winds to 30 kt becoming northwest. Waves 8 to 11 ft occasionally to 14 ft. $$ LMZ761-152115- MAFOR 1516/ MICHIGAN NORTH 12814 11114 12104 12114 11824. A chance of rain showers tonight and Thursday morning. Waves 2 feet or less. MICHIGAN SOUTH 11514 11424 11416 19414 12316 19314 11314 11426 19424 11536 19534. Waves 1 to 3 feet. $$ CMiller Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes