304 FZUS63 KDTX 231339 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 939 AM 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 afternoon and evening, favored across Lake Huron, High pressure, 30.10 inches, willl move over the Great Lakes late tomorrow into Tuesday. LCZ460-232145- Lake St Clair- 939 AM EDT Sun Aug 23 2026 .REST OF TODAY...Northwest winds 15 to 20 knots. Mostly sunny. A chance of showers and thunderstorms late in the afternoon. Waves 1 to 3 feet. .TONIGHT...Northwest winds 15 to 20 knots. Partly cloudy in the evening then clearing. A chance of showers and thunderstorms early in the evening. Waves 1 to 3 feet. .MONDAY...West winds 15 to 20 knots. Mostly 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. Mostly clear. Waves 2 feet or less. .TUESDAY...Northwest winds 5 to 10 knots in the morning becoming light and variable...then becoming south 5 to 10 knots in the evening. Sunny in the morning becoming mostly clear. Waves 2 feet or less. .WEDNESDAY...South winds 10 to 15 knots. Mostly clear. A chance of showers and thunderstorms. Waves 2 feet or less. .THURSDAY...West winds 10 to 15 knots. Partly cloudy. A chance of showers and thunderstorms. Waves 2 feet or less. $$ SS Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes  329 FZUS63 KDTX 231340 GLFLH Open Lake Forecast for Lake Huron National Weather Service Detroit/Pontiac MI 940 AM 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 afternoon and evening, favored across Lake Huron, High pressure, 30.10 inches, willl move over the Great Lakes late tomorrow into Tuesday. LHZ361-232145- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- 940 AM EDT Sun Aug 23 2026 .REST OF TODAY...Northwest winds 20 to 25 knots with gusts to around 30 knots. Waves 6 to 9 feet. Waves occasionally around 12 feet. .TONIGHT...Northwest winds 20 to 25 knots with gusts to around 30 knots. A chance of showers. Waves 6 to 9 feet. Waves occasionally around 12 feet. .MONDAY...Northwest winds 20 to 25 knots decreasing to 15 to 20 knots in the late morning and afternoon. Gusts to 30 knots. A chance of showers in the morning. Waves 6 to 9 feet. Waves occasionally around 12 feet. .MONDAY NIGHT...Northwest winds 15 to 20 knots decreasing to 5 to 10 knots. Waves 3 to 5 feet subsiding to 2 to 4 feet after midnight. .TUESDAY...Northwest winds 5 to 10 knots becoming light and variable...then becoming south 5 to 10 knots late in the evening. Waves 2 feet or less. .WEDNESDAY...South winds 5 to 10 knots becoming southeast 10 to 15 knots until early evening...then becoming south 5 to 10 knots by midnight. A chance of showers early in the morning. A chance of thunderstorms. Rain showers . Waves 1 to 3 feet building to 3 to 5 feet . .THURSDAY...Southwest winds 10 to 15 knots veering to the northwest . A chance of showers. 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 . $$ LHZ362-363-232145- 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- 940 AM EDT Sun Aug 23 2026 .REST OF TODAY...Northwest winds to 30 knots. A chance of waterspouts late in the morning. Waves 10 to 14 feet. Waves occasionally around 18 feet. .TONIGHT...Northwest winds to 30 knots. 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 to 30 knots decreasing to 20 to 25 knots in the late morning and afternoon. Waves 10 to 14 feet. Waves occasionally around 18 feet. .MONDAY NIGHT...Northwest winds 15 to 20 knots with gusts to around 30 knots decreasing to 10 to 15 knots after midnight. Waves 6 to 9 feet subsiding to 3 to 5 feet after midnight. Waves occasionally around 12 feet. .TUESDAY...Northwest winds 5 to 10 knots becoming light and variable...then becoming southeast 5 to 10 knots late in the evening. Waves 2 to 4 feet subsiding to 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 10 to 15 knots in the late morning and early afternoon...then increasing to 15 to 20 knots early in the evening decreasing to 10 to 15 knots by midnight. A chance of showers in the late morning and early afternoon. Rain showers likely. A chance of thunderstorms by midnight. Waves 1 to 3 feet building to 3 to 5 feet. .THURSDAY...Southwest winds 10 to 15 knots decreasing to 5 to 10 knots early in the evening...then becoming west 10 to 15 knots by midnight. A chance of showers. Waves 2 to 4 feet. $$ LHZ462>464-232145- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 940 AM EDT Sun Aug 23 2026 .REST OF TODAY...Northwest winds 20 to 25 knots with gusts to around 30 knots. A chance of showers and thunderstorms in the afternoon. Waves 8 to 12 feet. Waves occasionally around 15 feet. .TONIGHT...Northwest winds 15 to 20 knots increasing to 20 to 25 knots late in the evening...then decreasing to 15 to 20 knots after midnight increasing to 20 to 25 knots early in the morning. Gusts to 30 knots. A chance of showers and thunderstorms in the evening...then a chance of showers after midnight. Waves 8 to 12 feet. Waves occasionally around 15 feet. .MONDAY...West winds 20 to 25 knots becoming northwest 15 to 20 knots early in the afternoon. Gusts to 30 knots. A chance of showers in the morning. Waves 8 to 12 feet. Waves occasionally around 15 feet. .MONDAY NIGHT...Northwest winds 10 to 15 knots. Waves 5 to 7 feet. Waves occasionally around 10 feet. .TUESDAY...Northwest winds 10 to 15 knots decreasing to 5 to 10 knots late in the morning...then becoming light and variable late in the afternoon becoming southeast 5 to 10 knots late in the evening. Waves 3 to 5 feet subsiding to 1 to 3 feet. .WEDNESDAY...South winds 5 to 10 knots increasing to 10 to 15 knots in the late morning and early afternoon...then increasing to 15 to 20 knots early in the evening decreasing to 10 to 15 knots by midnight. Showers likely and a chance of thunderstorms . Waves 1 to 3 feet building to 3 to 5 feet . .THURSDAY...South winds 10 to 15 knots becoming southwest 5 to 10 knots early in the evening...then veering to the northwest by midnight. Showers likely early in the morning...then a chance of showers. Waves 2 to 4 feet subsiding to 1 to 3 feet. $$ LHZ461-232145- MAFOR 2315/ HURON NORTH 13730 11736 13746 11740. A chance of waterspouts this afternoon and evening. Waves 8 to 12 feet. Occasional wave height around 15 feet. HURON SOUTH 13730 14736 11730. A chance of thunderstorms this afternoon and evening. Waves 8 to 12 feet. Occasional wave height around 15 feet. $$ SS 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)  442 FZUS63 KMKX 231343 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 843 AM 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. LMZ261-362-364-366-563-565-567-868-232115- 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- 843 AM CDT Sun Aug 23 2026 SHEBOYGAN WI TO PENTWATER MI NORTH... .REST OF TODAY...Northwest winds to 30 kt becoming north. Slight chance of showers through mid morning. Waves 4 to 7 ft occasionally to 9 ft. .TONIGHT...North winds to 30 kt becoming northwest. Waves 4 to 7 ft occasionally to 9 ft. .MONDAY...Northwest winds 15 to 25 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. .MONDAY NIGHT...Northwest winds 10 to 20 kt diminishing to 5 to 10 kt overnight. Waves 2 to 4 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 diminishing to 10 to 20 kt. Chance of showers. Waves 3 to 5 ft. .WEDNESDAY...Southwest winds 15 to 25 kt becoming south to 30 kt. Showers likely with a chance of thunderstorms. Waves 4 to 6 ft occasionally to 8 ft. .THURSDAY...Northwest winds 10 to 20 kt increasing to 30 kt. Waves 1 to 3 ft. $$ LMZ080-669-671-673-675-777-779-870-872-874-876-878-232115- 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- 843 AM CDT Sun Aug 23 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH... .REST OF TODAY...Northwest winds to 30 kt becoming north. Waves 5 to 8 ft occasionally to 10 ft. .TONIGHT...North winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. .MONDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. .MONDAY NIGHT...Northeast winds 10 to 15 kt backing to southwest. Waves 1 to 3 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 15 to 25 kt becoming southwest 10 to 20 kt. Waves 3 to 5 ft. .WEDNESDAY...Southwest winds 15 to 25 kt increasing to 30 kt. Chance of showers and thunderstorms. Waves 4 to 6 ft occasionally to 8 ft. .THURSDAY...Northwest winds 10 to 20 kt becoming north. Waves 2 to 4 ft. $$ LMZ761-232115- MAFOR 2316/ MICHIGAN NORTH 12740 13840 11740 12730. Waves 3 to 6 feet this afternoon and tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Monday morning. MICHIGAN SOUTH 11740 11840 11830 12820 11810 11710 11720. Waves 4 to 7 feet this afternoon. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight. Waves 2 to 4 feet Monday morning. $$ Quigley Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes