FZUS63 KMKX 140254 GLFLM OPEN LAKE FORECAST for Lake Michigan National Weather Service Milwaukee/Sullivan WI 953 PM CDT Mon Apr 13 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... Shower and thunderstorm activity is expected across lake Michigan late this evening into tonight as low pressure of 29.6 inches over southeast Minnesota continues to head northeast. Winds will be easterly north of a frontal boundary across roughly the northern half of the lake, with southerly winds expected in the south. Then expecting another a couple passing low pressure system to develop in the Plains and track across Lake Michigan again on Tuesday and Wednesday. Each system will bring a chance for showers and thunderstorms through the middle of the week. Areas of dense fog will likely occur at times due to a relatively mild and humid airmass over the cold waters paired with lighter winds. LMZ261-362-364-366-563-868-140900- 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 Pentwater to Manistee MI 5 NM offshore to Mid Lake- 953 PM CDT Mon Apr 13 2026 STURGEON BAY WI TO POINT BETSIE MI NORTH... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT TUESDAY... .REST OF TONIGHT...East winds 15 to 25 kt becoming southeast. Patchy dense fog late this evening, then areas of dense fog overnight. Rain showers and thunderstorms late this evening, then rain showers with a chance of thunderstorms overnight. Waves 3 to 5 ft. .TUESDAY...North winds 10 to 20 kt veering to south 10 to 15 kt. Patchy dense fog in the morning. Slight chance of rain showers in the morning. Waves 3 to 5 ft subsiding to 1 to 3 ft. .TUESDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to 10 kt. Chance of rain showers. Waves 1 to 3 ft. .WEDNESDAY...Northeast winds 5 to 10 kt. Chance of rain showers in the afternoon. Waves 1 to 3 ft. .WEDNESDAY NIGHT...Northeast winds 5 to 10 kt becoming east 10 to 15 kt. Chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 3 ft. .THURSDAY...East winds 10 to 15 kt backing to northwest. Chance of rain showers. Waves 2 to 4 ft. .THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves 2 to 4 ft. .FRIDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 1 to 3 ft building to 2 to 4 ft. .SATURDAY...South winds to 30 kt becoming southwest. Rain showers likely. Waves 8 to 11 ft occasionally to 14 ft. $$ LMZ565-567-140900- Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake- Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake- 953 PM CDT Mon Apr 13 2026 STURGEON BAY WI TO POINT BETSIE MI SOUTH TO SHEBOYGAN WI TO PENTWATER MI... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT TUESDAY... ...SEVERE THUNDERSTORM WATCH 106 IN EFFECT UNTIL 4 AM CDT TUESDAY... .REST OF TONIGHT...East winds 15 to 25 kt becoming southeast. Patchy dense fog late this evening, then areas of dense fog overnight. Rain showers and thunderstorms late this evening, then rain showers with a chance of thunderstorms overnight. Waves 3 to 5 ft. .TUESDAY...North winds 10 to 20 kt veering to south 10 to 15 kt. Patchy dense fog in the morning. Slight chance of rain showers in the morning. Waves 3 to 5 ft subsiding to 1 to 3 ft. .TUESDAY NIGHT...Northeast winds 10 to 15 kt diminishing to 5 to 10 kt. Chance of rain showers. Waves 1 to 3 ft. .WEDNESDAY...Northeast winds 5 to 10 kt. Chance of rain showers in the afternoon. Waves 1 to 3 ft. .WEDNESDAY NIGHT...Northeast winds 5 to 10 kt becoming east 10 to 15 kt. Chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 3 ft. .THURSDAY...East winds 10 to 15 kt backing to northwest. Chance of rain showers. Waves 2 to 4 ft. .THURSDAY NIGHT...North winds 10 to 15 kt becoming northeast. Waves 2 to 4 ft. .FRIDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 1 to 3 ft building to 2 to 4 ft. .SATURDAY...South winds to 30 kt becoming southwest. Rain showers likely. Waves 8 to 11 ft occasionally to 14 ft. $$ LMZ669-671-673-675-140900- 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- 953 PM CDT Mon Apr 13 2026 SHEBOYGAN WI TO PENTWATER MI SOUTH TO WINTHROP HARBOR IL TO SOUTH HAVEN MI... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT TUESDAY... ...SEVERE THUNDERSTORM WATCH 106 IN EFFECT UNTIL 4 AM CDT TUESDAY... .REST OF TONIGHT...South winds to 30 kt. Patchy fog. Chance of rain showers and thunderstorms late this evening, then rain showers and thunderstorms overnight. Waves 2 to 4 ft building to 3 to 5 ft. .TUESDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt, then becoming south 10 to 20 kt late. Patchy dense fog in the morning. Chance of rain showers and thunderstorms in the morning, then slight chance of rain showers and thunderstorms in the afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft. .TUESDAY NIGHT...Southeast winds 10 to 20 kt veering to west. Rain showers likely with a chance of thunderstorms in the evening, then chance of rain showers and thunderstorms overnight. Waves 2 to 4 ft. .WEDNESDAY...Southwest winds 10 to 15 kt backing to southeast. Chance of rain showers in the morning, then rain showers likely in the afternoon. Waves 2 to 4 ft. .WEDNESDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10 to 20 kt. Rain showers with a chance of thunderstorms in the evening, then rain showers likely with a chance of thunderstorms overnight. Waves 2 to 4 ft. .THURSDAY...Southwest winds 10 to 20 kt. Rain showers likely. Waves 2 to 4 ft. .THURSDAY NIGHT...Northwest winds 10 to 15 kt becoming north. Waves 2 to 4 ft. .FRIDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 1 to 3 ft building to 2 to 4 ft. .SATURDAY...South winds to 30 kt becoming southwest. Rain showers likely. Waves 7 to 10 ft occasionally to 13 ft. $$ LMZ870-872-874-876-140900- Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake- Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake- Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake- Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake- 953 PM CDT Mon Apr 13 2026 WILMETTE HARBOR IL TO ST. JOSEPH MI SOUTH TO ROCK ISLAND PASSAGE TO CHARLEVOIX MI... ...DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT TUESDAY... .REST OF TONIGHT...South winds to 30 kt. Patchy fog. Chance of rain showers and thunderstorms late this evening, then rain showers and thunderstorms overnight. Waves 2 to 4 ft building to 3 to 5 ft. .TUESDAY...Southwest winds 10 to 20 kt increasing to 15 to 25 kt, then becoming south 10 to 20 kt late. Patchy dense fog in the morning. Chance of rain showers and thunderstorms in the morning, then slight chance of rain showers and thunderstorms in the afternoon. Waves 3 to 5 ft subsiding to 2 to 4 ft. .TUESDAY NIGHT...Southeast winds 10 to 20 kt veering to west. Rain showers likely with a chance of thunderstorms in the evening, then chance of rain showers and thunderstorms overnight. Waves 2 to 4 ft. .WEDNESDAY...Southwest winds 10 to 15 kt backing to southeast. Chance of rain showers in the morning, then rain showers likely in the afternoon. Waves 2 to 4 ft. .WEDNESDAY NIGHT...Southeast winds 10 to 15 kt becoming south 10 to 20 kt. Rain showers with a chance of thunderstorms in the evening, then rain showers likely with a chance of thunderstorms overnight. Waves 2 to 4 ft. .THURSDAY...Southwest winds 10 to 20 kt. Rain showers likely. Waves 2 to 4 ft. .THURSDAY NIGHT...Northwest winds 10 to 15 kt becoming north. Waves 2 to 4 ft. .FRIDAY...East winds 10 to 15 kt becoming southeast 10 to 20 kt. Waves 1 to 3 ft building to 2 to 4 ft. .SATURDAY...South winds to 30 kt becoming southwest. Rain showers likely. Waves 7 to 10 ft occasionally to 13 ft. $$ LMZ080-777-779-878-140900- Lake Michigan from Michigan City IN to St. Joseph MI 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 St. Joseph to South Haven MI 5 NM offshore to Mid Lake- 953 PM CDT Mon Apr 13 2026 WINTHROP HARBOR IL TO SOUTH HAVEN MI SOUTH... .REST OF TONIGHT...South winds 15 to 25 kt becoming southwest to 30 kt. Slight chance of showers and thunderstorms late this evening, then showers and thunderstorms likely overnight. Patchy dense fog overnight. Waves 2 to 4 ft building to 3 to 5 ft. .TUESDAY...Southwest winds 10 to 20 kt. Patchy dense fog in the morning. Chance of showers and thunderstorms in the morning, then slight chance of showers and thunderstorms in the afternoon. Waves 3 to 5 ft subsiding to 1 to 3 ft. .TUESDAY NIGHT...South winds 10 to 20 kt becoming southwest. Showers and thunderstorms likely in the evening, then showers likely overnight. Waves 2 to 4 ft. .WEDNESDAY...South winds 10 to 15 kt. Showers likely in the morning, then showers in the afternoon. Waves 1 to 3 ft. .WEDNESDAY NIGHT...South winds 10 to 15 kt becoming southwest 10 to 20 kt. Showers with a chance of thunderstorms in the evening, then showers likely with a chance of thunderstorms overnight. Waves 1 to 3 ft. .THURSDAY...Southwest winds 10 to 20 kt. Showers likely. Waves 2 to 4 ft. .THURSDAY NIGHT...West winds 10 to 15 kt becoming north 5 to 10 kt. Waves 1 to 3 ft. .FRIDAY...East winds 5 to 10 kt becoming southeast 10 to 15 kt. Waves 1 to 3 ft. .SATURDAY...Southwest winds to 30 kt diminishing to 15 to 25 kt. Showers likely. Waves 4 to 7 ft occasionally to 9 ft. $$ LMZ761-140900- MAFOR 1404 AMD/ MICHIGAN NORTH...SEVERE THUNDERSTORM WATCH IN EFFECT...11249 19244 11336 19334 11120 19124 11810 19814 12410 11110 11100. Waves 1 to 3 feet building to 2 to 4 feet overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet Tuesday. Waves 1 to 3 feet Tuesday evening. MICHIGAN SOUTH...SEVERE THUNDERSTORM WATCH IN EFFECT...11440 11549 11520 19524 11530 19534 11520 12420 11429. Waves 2 to 4 feet building to 3 to 5 feet overnight. Waves 3 to 5 feet subsiding to 1 to 3 feet Tuesday. Waves 1 to 3 feet Tuesday evening. $$ WFO MKX Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes