289 FZUS63 KMKX 231900 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 200 PM CDT Sun Aug 23 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... Scattered shower chances continue over the northern third of Lake Michigan today, with a few waterspouts possible. 29.7 inch low pressure is centered near the Ontario-Quebec border, resulting in breezy northwest winds across the open waters of Lake Michigan. The breezy winds will continue through tonight as the low lingers in the same general vicinity. Expecting most gusts to remain in the 25-30 knot range, though a few gusts approaching gale force are possible over the northern third of the lake. Given the brief & isolated nature of any such gusts, not anticipating the need for any gale headlines, but will be monitoring trends. 30.1 inch high pressure will steadily build into the Upper Mississippi Valley today, reaching the waters by Monday afternoon. The high's arrival will lead to decreasing winds, with conditions becoming light and variable by Monday evening. Light and variable winds will continue Monday night 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 breezy 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 through the beginning of this week. The next area of 30.1 inch high pressure will gradually build toward Lake Michigan from the northern Great Plains Wednesday night through Friday, bringing slowly decreasing winds. LMZ261-362-364-366-563-565-567-868-240315- 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- 200 PM CDT Sun Aug 23 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .TONIGHT...North winds to 30 kt becoming northwest. Waves 4 to 6 ft occasionally to 8 ft. .MONDAY...Northwest winds to 30 kt becoming north 15 to 25 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .MONDAY NIGHT...North winds 10 to 20 kt diminishing to 5 to 10 kt. 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 to 2 ft building to 2 to 4 ft. .TUESDAY NIGHT...South winds 15 to 25 kt. Chance of showers overnight. Waves 3 to 5 ft. .WEDNESDAY...South winds to 30 kt becoming southwest. Showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Waves 4 to 6 ft occasionally to 8 ft. .WEDNESDAY NIGHT...Southwest winds 15 to 25 kt becoming west 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .THURSDAY...Northwest winds 10 to 20 kt increasing to 30 kt. Waves 1 to 3 ft. .FRIDAY...North winds 10 to 20 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-240315- 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- 200 PM CDT Sun Aug 23 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .TONIGHT...North winds 10 to 20 kt becoming northwest. 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...Northeast winds 10 to 20 kt becoming northwest 5 to 10 kt late in the evening, then becoming west after midnight becoming west 5 to 10 kt late. Waves 2 to 4 ft subsiding to 1 to 2 ft. .TUESDAY...Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft building to 2 to 4 ft. .TUESDAY NIGHT...South winds 10 to 20 kt increasing to 15 to 25 kt. Waves 3 to 5 ft. .WEDNESDAY...Southwest winds to 30 kt. Chance of showers in the morning, then chance of showers and thunderstorms in the afternoon. Waves 4 to 6 ft occasionally to 8 ft. .WEDNESDAY NIGHT...Southwest winds 15 to 25 kt becoming west 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. .FRIDAY...North winds 10 to 20 kt. Waves 2 to 4 ft. $$ LMZ761-240315- MAFOR 2322/ MICHIGAN NORTH 12840 12740 13730 11830. Waves 3 to 6 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Monday. MICHIGAN SOUTH 11830 12820 11710 13720 11820. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight. Waves 2 to 4 feet Monday. $$ Quigley Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes  990 FZUS63 KDTX 231938 GLFLH Open Lake Forecast for Lake Huron National Weather Service Detroit/Pontiac MI 338 PM EDT Sun Aug 23 2026 For waters beyond five nautical miles off shore on Lake Huron 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...Post-frontal northwest flow brings breezy conditions through Monday. Chances for some rain showers and an isolated thunderstorm will return this evening and overnight, favored across Lake Huron, High pressure, 30.10 inches, will move over the Great Lakes late tomorrow into Tuesday. LHZ361-240345- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- 338 PM EDT Sun Aug 23 2026 .TONIGHT...Northwest winds 20 to 25 knots with gusts to 35 knot gales. A chance of showers. Waves 6 to 9 feet. Waves occasionally around 12 feet. .MONDAY...Northwest winds 20 to 25 knots with gusts to around 30 knots decreasing to 15 to 20 knots with gusts to around 30 knots in the afternoon. Waves 6 to 9 feet. Waves occasionally around 12 feet. .MONDAY NIGHT...Northwest winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Waves 4 to 6 feet subsiding to 2 to 4 feet after midnight. Waves occasionally around 8 feet. .TUESDAY...Northwest winds 5 to 10 knots until late afternoon becoming light and variable. Waves 2 feet or less. .TUESDAY NIGHT...Light and variable winds becoming south 5 to 10 knots in the late evening and overnight. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots becoming southeast 5 to 10 knots late in the afternoon...then veering to the south late in the evening. Showers and a chance of thunderstorms. Waves 1 to 3 feet building to 3 to 5 feet late in the afternoon. .THURSDAY...West winds 10 to 15 knots increasing to 15 to 20 knots early in the evening...then becoming northwest 10 to 15 knots by midnight. A chance of showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning and early afternoon...then building to 2 to 4 feet . .FRIDAY...Northwest winds 10 to 15 knots decreasing to 5 to 10 knots. Waves 1 to 3 feet. $$ LHZ362-363-240345- Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore- Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore- 338 PM EDT Sun Aug 23 2026 .TONIGHT...Northwest winds 20 to 25 knots with gusts to 35 knot gales. A chance of waterspouts in the evening. A chance of showers in the evening...then showers likely after midnight. Waves 10 to 14 feet. Waves occasionally around 18 feet. .MONDAY...Northwest winds 20 to 25 knots with gusts to around 30 knots. A chance of showers in the morning. Waves 8 to 12 feet. Waves occasionally around 15 feet. .MONDAY NIGHT...Northwest winds 15 to 20 knots decreasing to 10 to 15 knots in the late evening and overnight. Waves 6 to 9 feet subsiding to 4 to 6 feet after midnight. Waves occasionally around 12 feet. .TUESDAY...Northwest winds 5 to 10 knots until late afternoon becoming light and variable. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning and afternoon. .TUESDAY NIGHT...Southeast winds 5 to 10 knots becoming south 10 to 15 knots after midnight. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots with gusts to around 30 knots increasing to 15 to 20 knots with gusts to around 30 knots late in the afternoon...then decreasing to 10 to 15 knots late in the evening. A chance of showers. A chance of thunderstorms late in the afternoon. Waves 1 to 3 feet building to 3 to 5 feet. .THURSDAY...Southwest winds 10 to 15 knots becoming west 5 to 10 knots in the late morning and early afternoon...then becoming northwest 10 to 15 knots . Waves 2 to 4 feet. .FRIDAY...Northwest winds10 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet . $$ LHZ462>464-240345- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 338 PM EDT Sun Aug 23 2026 .TONIGHT...Northwest winds 15 to 20 knots with gusts to around 30 knots becoming west 20 to 25 knots with gusts to around 30 knots early in the morning. A chance of showers. Waves 8 to 12 feet. Waves occasionally around 15 feet. .MONDAY...West winds 20 to 25 knots becoming northwest 15 to 20 knots in the afternoon. Gusts to 30 knots. A chance of showers in the morning. Waves 8 to 12 feet. Waves occasionally around 15 feet. .MONDAY NIGHT...Northwest winds 10 to 15 knots. Waves 5 to 7 feet. Waves occasionally around 10 feet. .TUESDAY...Northwest winds 5 to 10 knots until late afternoon becoming light and variable. Waves 3 to 5 feet subsiding to 1 to 3 feet in the late morning and afternoon. .TUESDAY NIGHT...Light and variable winds becoming south 5 to 10 knots in the late evening and overnight. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots increasing to 15 to 20 knots late in the afternoon...then decreasing to 10 to 15 knots late in the evening. A chance of showers late in the morning. A chance of thunderstorms late in the afternoon. Rain showers likely late in the evening. Waves 1 to 3 feet building to 3 to 5 feet late in the afternoon. .THURSDAY...Southwest winds 10 to 15 knots becoming west 5 to 10 knots until early evening...then becoming northwest 10 to 15 knots by midnight. A chance of showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet. .FRIDAY...Northwest winds 10 to 15 knots becoming north 5 to 10 knots . Waves 2 to 4 feet subsiding to 1 to 3 feet . $$ LHZ461-240345- MAFOR 2321/ HURON NORTH 11730 19750 13736 13730 11720. A chance of waterspouts this evening. Waves 6 to 9 feet. Waves occasional wave height around 12 feet.. HURON SOUTH 13730 12736 12730 11720. Waves 8 to 12 feet. Occasional wave height around 15 feet. $$ AM Experimental modernized open lake forecast is available online at weather.gov/dtx/glftable (all lower case) Graphical marine forecasts are available online at weather.gov/greatlakes (all lower case)  002 FZUS63 KDTX 231938 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 338 PM EDT Sun Aug 23 2026 Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...Post-frontal northwest flow brings breezy conditions through Monday. Chances for some showers and an isolated thunderstorm will return this evening and overnight, favored across Lake Huron, High pressure, 30.10 inches, will move over the Great Lakes late tomorrow into Tuesday. LCZ460-240345- Lake St Clair- 338 PM EDT Sun Aug 23 2026 .TONIGHT...Northwest winds 10 to 15 knots increasing to 15 to 20 knots in the late evening and overnight. Partly cloudy. A chance of showers and thunderstorms early in the evening. Waves 1 to 3 feet. .MONDAY...West winds 15 to 20 knots becoming northwest 10 to 15 knots late in the afternoon. Partly sunny. Waves 1 to 3 feet. .MONDAY NIGHT...Northwest winds 10 to 15 knots diminishing to 5 to 10 knots in the late evening and overnight. Partly cloudy. Waves 2 feet or less. .TUESDAY...Northwest winds 5 to 10 knots early in the morning becoming light and variable. Mostly sunny. Waves 2 feet or less. .TUESDAY NIGHT...South winds 5 to 10 knots. Mostly clear. Waves 2 feet or less. .WEDNESDAY...South winds 5 to 10 knots increasing to 15 to 20 knots. Partly sunny...then partly cloudy with showers likely and a chance of thunderstorms in the evening. Waves 2 feet or less. .THURSDAY...Northwest winds 10 to 15 knots. Partly cloudy. Showers likely and a chance of thunderstorms. Waves 2 feet or less. .FRIDAY...Northeast winds 10 to 15 knots. Mostly clear. Waves 2 feet or less. $$ AM Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes  461 FZUS61 KCLE 231947 GLFLE Open Lake Forecast for Lake Erie National Weather Service Cleveland OH 347 PM EDT Sun Aug 23 2026 For waters beyond five nautical miles of shore on Lake Erie 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 trough averaging 29.80 will linger over the eastern Great Lakes through Monday, followed by high pressure 30.00 inches Monday night into Wednesday. Low pressure 29.80 inches will extend a cold front east across the area late Wednesday into Thursday. High pressure 30.10 will return across the area on Friday. LEZ162-163-240230- Detroit River Lt. to Maumee Bay OH to Reno Beach OH beyond 5NM offshoreline to US-Canadian border- Reno Beach to The Islands OH beyond 5NM off shoreline to US- Canadian border- 347 PM EDT Sun Aug 23 2026 .TONIGHT...West winds 15 to 20 knots becoming northwest. A chance of waterspouts early. A slight chance of showers and thunderstorms early. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY...West winds 15 to 20 knots. Waves 2 to 4 feet subsiding to 1 to 3 feet. .MONDAY NIGHT...West winds 10 to 15 knots becoming north. Waves 1 to 3 feet. .TUESDAY...Northwest winds 10 knots or less becoming southwest. Waves 1 foot or less. .TUESDAY NIGHT...South winds 5 to 10 knots becoming southwest. Waves 1 foot or less. .WEDNESDAY...Southwest winds 5 to 15 knots. A chance of showers and thunderstorms Wednesday night. Waves 2 feet or less. .THURSDAY...Southwest winds 5 to 15 knots becoming northwest. Waves 2 feet or less. .FRIDAY...Northwest winds 10 knots or less becoming northeast. Waves 1 foot or less. Winds and waves higher in and near thunderstorms. $$ LEZ164-165-240230- The Islands to Vermilion OH beyond 5 nm off shoreline to US- Canadian border- Vermilion to Avon Point OH beyond 5 nm off shoreline to US- Canadian border- 347 PM EDT Sun Aug 23 2026 .TONIGHT...West winds 15 to 20 knots becoming northwest. A chance of waterspouts this evening. Showers likely with a chance of thunderstorms early, then a chance of showers and thunderstorms late this evening. Waves 2 to 4 feet. .MONDAY...West winds 15 to 20 knots. Waves 3 to 6 feet. .MONDAY NIGHT...West winds 15 to 20 knots becoming northwest 5 to 15 knots. Waves 2 to 4 feet subsiding to 1 to 2 feet. .TUESDAY...Northwest winds 10 knots or less becoming west. Waves 1 foot or less. .TUESDAY NIGHT...Southwest winds 10 knots or less becoming south. Waves 1 foot or less. .WEDNESDAY...South winds 5 to 15 knots becoming southwest. A chance of showers Wednesday night. Waves 2 feet or less. .THURSDAY...Southwest winds 5 to 15 knots becoming northwest. A chance of showers and thunderstorms during the day. Waves 2 feet or less. .FRIDAY...Northwest winds 5 to 10 knots becoming northeast. Waves 2 feet or less. Winds and waves higher in and near thunderstorms. $$ LEZ061-166>169-240230- Ripley to Buffalo NY extending from 5NM off shoreline to US- Canadian border- Avon Point to Willowick OH beyond 5 nm off shoreline to US- Canadian border-Willowick to Geneva-on-the- Lake OH beyond 5NM off shoreline to US-Canadian border-Geneva-on- the-Lake to Conneaut OH beyond 5 nm off shoreline to US- Canadian border- Conneaut OH to Ripley NY beyond 5 nm off shoreline to US- Canadian border- 347 PM EDT Sun Aug 23 2026 .TONIGHT...Northwest winds 15 to 25 knots becoming west. A chance of waterspouts. Showers with a chance of thunderstorms this evening, then a chance of showers with a slight chance of thunderstorms after midnight. A slight chance of showers late. Waves 3 to 5 feet subsiding to 2 to 4 feet. .MONDAY...West winds 15 to 25 knots. A chance of waterspouts. A chance of showers early, then showers likelylate in the morning. A chance of showers in the afternoon. Waves 3 to 5 feet building to 5 to 8 feet. Waves occasionally around 10 feet. .MONDAY NIGHT...West winds 15 to 25 knots becoming northwest and diminishing to 10 to 15 knots. A chance of waterspouts. Waves 3 to 6 feet subsiding to 1 to 3 feet. .TUESDAY...Northwest winds 5 to 15 knots becoming west. Waves 1 to 3 feet subsiding to 1 foot or less. .TUESDAY NIGHT...West winds 5 to 10 knots becoming south. Waves 1 foot or less. .WEDNESDAY...South winds 5 to 15 knots increasing to 15 to 20 knots. A chance of showers Wednesday night. Waves 1 to 3 feet. .THURSDAY...Southwest winds 15 to 20 knots becoming west 5 to 15 knots. A chance of showers. Waves 1 to 3 feet. .FRIDAY...Northwest winds 5 to 15 knots becoming northeast. Waves 1 to 2 feet. Winds and waves higher in and near thunderstorms. $$ LEZ161-240230- MAFOR 2321/ ERIE WEST 1/3 11620 14720 13620. A chance of waterspouts this evening. A chance of showers and thunderstorms this evening. Waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet tonight. Waves 3 to 6 feet Monday. ERIE CENTRAL 1/3 11636 11736 12720 11620 13630. A chance of waterspouts. A chance of thunderstorms this evening. Waves 3 to 5 feet tonight. Waves 3 to 6 feet building to 4 to 7 feet, and occasionally around 9 feet Monday. ERIE EAST 1/3 12626 11616 12620 11636 12630. A chance of waterspouts. A chance of thunderstorms tonight. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. Waves 3 to 5 feet building to 5 to 8 feet, and occasionally around 10 feet Monday. $$