253 FZUS63 KMQT 200201 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 1001 PM EDT Tue May 19 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 30.3 inch high over the Northern Plains builds to 30.4 inches tonight into Wednesday as it tracks eastward into the Upper Great Lakes. The high pressure shifts east on Thursday while leaving lingering ridging of at least 30.3 inches over Lake Superior through Friday. A 29.9 inch low then lifts into the Lower Great Lakes from the Southern Plains Friday night and Saturday, but 30.1 inch ridging could persists over Lake Superior the remainder of the weekend. LSZ162-200800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 1001 PM EDT Tue May 19 2026 /901 PM CDT Tue May 19 2026/ .REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .WEDNESDAY...West winds 5 to 15 knots backing south in the afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet. .THURSDAY...East winds 5 to 15 knots. 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 becoming northeast 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...Northeast winds 10 to 20 knots. A chance of rain showers. Waves subsiding to 1 to 3 feet. .SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ263-200800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 1001 PM EDT Tue May 19 2026 .REST OF TONIGHT...Northwest winds 5 to 15 knots. Waves 2 to 4 feet subsiding to calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest in the afternoon. Waves calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south late. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet. .FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...East winds 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. $$ LSZ264-200800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 1001 PM EDT Tue May 19 2026 .REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY...Northwest winds 5 to 15 knots backing southwest late. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 5 to 15 knots. Waves building to 1 to 3 feet. .SATURDAY...East winds 10 to 20 knots becoming southeast 5 to 15 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. $$ LSZ265-200800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 1001 PM EDT Tue May 19 2026 .REST OF TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet, then building to 2 to 4 feet. .WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to 15 knots in the afternoon, then veering southeast late. Waves subsiding to calm to 2 feet. .WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Waves calm to 2 feet. .THURSDAY...Southeast winds 5 to 15 knots becoming east 15 to 25 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY NIGHT...East winds 10 to 20 knots. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 10 to 20 knots backing south. Waves calm to 2 feet. $$ LSZ266-200800- 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 Tue May 19 2026 .REST OF TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots late. Waves 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then backing west late. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after midnight. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots becoming east 10 to 20 knots by mid afternoon. Waves building to 1 to 3 feet. .THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...Southeast winds 10 to 20 knots backing east by mid afternoon. Waves building to 1 to 3 feet. .FRIDAY NIGHT...East winds 10 to 20 knots. Waves building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet. .SUNDAY...West winds 5 to 15 knots backing southwest. Waves subsiding to calm to 2 feet. $$ LSZ267-200800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 1001 PM EDT Tue May 19 2026 .REST OF TONIGHT...Northwest winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north after midnight, then becoming west less than 10 knots late. Waves subsiding to calm to 2 feet. .THURSDAY...South winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves calm to 2 feet. .FRIDAY...Southeast winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .FRIDAY NIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots after midnight. Waves building to 1 to 3 feet. .SATURDAY...East winds 15 to 25 knots becoming southeast 10 to 20 knots. A chance of rain showers. Waves building to 2 to 4 feet, then subsiding to calm to 2 feet. .SUNDAY...West winds 5 to 15 knots backing southwest. Waves calm to 2 feet. $$ LSZ261-200800- MAFOR 2003/ Superior West 12710 12700 11500 11410 11400 11300. Waves 1 to 3 feet overnight. Waves 1 foot or less Wednesday and Wednesday evening. Superior North Central 11730 12720 11710 11700 12510 11500. Waves 2 to 4 feet overnight. Waves 1 to 3 feet Wednesday. Waves 2 feet or less Wednesday evening. Superior South Central 13730 11720 11810 11100 11200 11400. Waves 2 to 4 feet building to 3 to 5 feet overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Wednesday. Waves 2 feet or less Wednesday evening. Superior East 12740 11730 13720 11710 11700. Waves 4 to 6 feet overnight. Waves 3 to 6 feet subsiding to 2 to 3 feet Wednesday. Waves 2 to 3 feet Wednesday 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  303 FZUS61 KBUF 200202 GLFLO Open Lake Forecast for Lake Ontario National Weather Service Buffalo NY 1002 PM EDT Tue May 19 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...An 29.6 inch area of low pressure over western Quebec this evening will swing a cold front across the Lake late tonight. A large 30.4 inch area of surface high pressure will then build across the entire Great Lakes region Wednesday afternoon through Thursday, before sliding east off the New England coast late Friday. This surface high will then strengthen to 30.6 inches as it anchors over Atlantic Canada through Sunday. A 29.9 inch low and attendant warm front will then slowly approach the Lake later Friday night and Saturday, before weakening and sliding eastward Sunday with the large area of high pressure over Atlantic Canada. LOZ062-200900- Lake Ontario open waters from the Niagara River to Hamlin Beach- 1002 PM EDT Tue May 19 2026 .REST OF TONIGHT...Southwest winds 15 to 20 knots becoming west. Showers with a chance of thunderstorms late this evening, then a chance of showers after midnight. Showers likely late. Waves 3 to 5 feet. .WEDNESDAY...Northwest winds 10 to 15 knots becoming west. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY NIGHT...Northwest winds 10 to 15 knots becoming north. Waves 1 to 3 feet. .THURSDAY...Northeast winds 5 to 15 knots becoming southeast. Waves 2 feet or less. .THURSDAY NIGHT...East winds 10 knots or less. Waves 1 foot or less. .FRIDAY...East winds 10 to 15 knots increasing to 15 to 20 knots. Showers likely Friday night. Waves 2 feet or less building to 2 to 4 feet. .SATURDAY...East winds 15 to 25 knots. Showers likely. Waves 3 to 6 feet. .SUNDAY...East winds 5 to 15 knots becoming southwest less than 10 knots. Showers likely during the day, then a chance of showers Sunday night. Waves 1 to 3 feet subsiding to 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LOZ063>065-200900- Lake Ontario open waters from Hamlin Beach to the Saint Lawrence River- 1002 PM EDT Tue May 19 2026 .REST OF TONIGHT...Southwest winds 15 to 20 knots becoming west. Showers likely with a chance of thunderstorms late this evening, then showers likely after midnight. Waves 2 to 4 feet. .WEDNESDAY...West winds 15 to 20 knots. A chance of showers early. Waves 2 to 4 feet building to 3 to 6 feet. .WEDNESDAY NIGHT...West winds 15 to 20 knots becoming north 10 to 15 knots. Waves 3 to 6 feet subsiding to 1 to 3 feet. .THURSDAY...Northeast winds 5 to 15 knots becoming west. Waves 1 to 3 feet subsiding to 1 foot or less. .THURSDAY NIGHT...West winds less than 10 knots. Waves 1 foot or less. .FRIDAY...East winds 5 to 15 knots increasing to 15 to 20 knots. A chance of showers Friday night. Waves 1 to 3 feet. .SATURDAY...East winds 15 to 20 knots becoming southeast. Showers likely. Waves 3 to 5 feet subsiding to 2 to 4 feet. .SUNDAY...Southeast winds 15 to 20 knots becoming south 10 to 15 knots. Showers likely during the day, then a chance of showers Sunday night. Waves 2 to 4 feet subsiding to 1 to 3 feet. Winds and waves higher in and near thunderstorms. $$ LOZ061-200900- MAFOR 2003/ ONTARIO WEST 1/2 11520 11620 12610 12620 12710. A chance of showers overnight. Waves 3 to 5 feet overnight. Waves 2 to 4 feet Wednesday and Wednesday evening. ONTARIO EAST 1/2 12520 11610 14620 11620. A chance of showers overnight. Waves 2 to 4 feet overnight. Waves 2 to 4 feet building to 3 to 6 feet Wednesday. Waves 3 to 6 feet Wednesday evening. $$  355 FZUS61 KBUF 200203 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1003 PM EDT Tue May 19 2026 SLZ022-024-200900- Saint Lawrence River from Cape Vincent to Saint Regis 1003 PM EDT Tue May 19 2026 .REST OF TONIGHT...Southwest winds 10 to 15 knots. A chance of showers and thunderstorms late this evening, then a chance of showers after midnight. .WEDNESDAY...Southwest winds 5 to 15 knots becoming west. Mostly cloudy early, then becoming mostly sunny. .WEDNESDAY NIGHT...Northwest winds 5 to 15 knots becoming north. Partly cloudy. .THURSDAY...North winds 10 knots or less becoming northwest. Sunny. .THURSDAY NIGHT...Northwest winds less than 10 knots. Mainly clear. .FRIDAY...Light and variable winds. A chance of showers Friday night. .SATURDAY...East winds 5 to 10 knots becoming southeast. A chance of showers. .SUNDAY...Southeast winds 10 knots or less becoming south. A chance of showers during the day, then showers likely Sunday night. Winds and waves higher in and near thunderstorms. $$  132 FZUS63 KMKX 200217 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 917 PM CDT Tue May 19 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... Lingering gusty winds this evening, but will gradually diminish overnight as high pressure around 30.4 inches builds into the Upper Great Lakes region Wednesday and Thursday. Still looking at gusty northeast winds through midweek, especially over the southern half of the lake and building waves along the western lakeshore. High pressure continues to build to around 30.5 inches as it lifts northeastward across Ontario and Quebec Friday through the weekend with easterly winds persisting across Lake Michigan. Expecting winds to increase during this timeframe as well with a broad low pressure trough around 29.8 inches setting up over the Plains. LMZ261-362-364-366-563-565-567-868-200930- 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- 917 PM CDT Tue May 19 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TONIGHT...Northwest winds 15 to 25 kt becoming north 10 to 20 kt. Waves 2 to 4 ft. .WEDNESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt. Waves 2 to 4 ft. .WEDNESDAY NIGHT...Northeast winds 10 to 20 kt diminishing to 10 to 15 kt. Waves 1 to 3 ft. .THURSDAY...Northeast winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 3 ft. .THURSDAY NIGHT...Northeast winds 10 to 20 kt becoming east 10 to 15 kt. Waves 1 to 3 ft. .FRIDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt. Waves 1 to 3 ft building to 3 to 5 ft. .FRIDAY NIGHT...East winds 15 to 25 kt increasing to 30 kt. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY...East winds to 30 kt becoming northeast. Chance of showers. Waves 4 to 6 ft occasionally to 8 ft. .SUNDAY...Southwest winds 10 to 15 kt. Waves 1 ft or less. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-200930- 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- 917 PM CDT Tue May 19 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TONIGHT...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. .WEDNESDAY...North winds 10 to 20 kt increasing to 15 to 25 kt. Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. .WEDNESDAY NIGHT...North winds 15 to 25 kt becoming northeast 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. .THURSDAY...East winds 10 to 15 kt becoming north 10 to 20 kt. Waves 2 to 4 ft. .THURSDAY NIGHT...Northeast winds 10 to 20 kt becoming east. Waves 3 to 5 ft. .FRIDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt. Chance of rain showers. Waves 3 to 5 ft. .FRIDAY NIGHT...East winds 15 to 25 kt. Showers likely. Waves 4 to 6 ft occasionally to 8 ft. .SATURDAY...East winds 10 to 20 kt becoming north 10 to 15 kt. Waves 3 to 5 ft subsiding to 2 to 4 ft. .SUNDAY...West winds 5 to 10 kt backing to southeast. Waves 1 ft or less. $$ LMZ761-200930- MAFOR 2004/ MICHIGAN NORTH 12720 13820 11830 11130 11110. Waves 1 to 3 feet. MICHIGAN SOUTH 11730 11720 13820 12830 11120. Waves 2 to 4 feet overnight. Waves 2 to 4 feet building to 3 to 5 feet Wednesday. Waves 3 to 6 feet Wednesday evening. $$ Wagner Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes