849  
FZUS63 KMKX 301948  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  
248 PM CDT WED JUL 30 2025  
 
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  
 
 
NORTH TO NORTHEAST WINDS WILL PERSIST ACROSS LAKE MICHIGAN  
THROUGH FRIDAY. WEAK LOW PRESSURE AROUND 29.9 INCHES IS MOVING  
EAST THROUGH THE OHIO RIVER VALLEY TODAY BRINGING SHOWERS AND  
THUNDERSTORMS TO THE SOUTHERN HALF OF THE LAKE. A FEW STRONGER  
GUSTS WITH THE THUNDERSTORMS WILL BE POSSIBLE ACROSS THE FAR  
SOUTHERN END OF THE LAKE, BUT NOT ANTICIPATING ANY SEVERE LEVEL  
WIND GUSTS.  
 
HIGH PRESSURE AROUND 30.3 INCHES WILL MOVE INTO THE WESTERN GREAT  
LAKES FROM THE NORTHERN PLAINS THURSDAY. THIS AREA OF HIGH  
PRESSURE WILL SLOWLY MOVE EASTWARD OVERTIMES AND BE OVERHEAD  
SATURDAY. WINDS WILL LIGHT AND VARIABLE ACROSS THE LAKE MUCH OF  
THE DAY SATURDAY BEFORE BECOMING LIGHT SOUTH TO SOUTHEASTERLY  
SUNDAY AFTERNOON AS THE HIGH PUSHES INTO THE NEW ENGLAND STATES.  
 
LMZ261-362-364-366-563-565-567-868-310315-  
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-  
248 PM CDT WED JUL 30 2025  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
TONIGHT  
NORTH WINDS 15 TO 25 KT BECOMING NORTHEAST. AREAS OF  
SMOKE. WAVES 3 TO 5 FT BUILDING TO 4 TO 7 FT OCCASIONALLY TO  
9 FT.    
THURSDAY  
NORTHEAST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
AREAS OF SMOKE. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.    
THURSDAY NIGHT  
NORTH WINDS TO 30 KT BECOMING NORTHEAST 10 TO  
20 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO  
4 FT.    
FRIDAY  
NORTH WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.    
FRIDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 5 TO  
10 KT OVERNIGHT. WAVES 1 TO 3 FT SUBSIDING TO 1 TO 2 FT.    
SATURDAY  
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 10 TO  
20 KT. WAVES 1 TO 2 FT.    
SATURDAY NIGHT  
SOUTHWEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO  
10 KT. WAVES 1 TO 2 FT.    
SUNDAY  
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT.  
WAVES 1 TO 2 FT.    
MONDAY  
SOUTH WINDS 5 TO 10 KT BECOMING SOUTHEAST 10 TO 15 KT.  
WAVES 1 FT OR LESS.  
 
 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-310315-  
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-  
248 PM CDT WED JUL 30 2025  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
TONIGHT  
NORTHEAST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
SHOWERS LIKELY WITH SLIGHT CHANCE OF THUNDERSTORMS THIS EVENING,  
THEN CHANCE OF SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS  
OVERNIGHT. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.    
THURSDAY  
NORTHEAST WINDS TO 30 KT BECOMING NORTH. SLIGHT  
CHANCE OF SHOWERS IN THE MORNING. PATCHY SMOKE. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO  
9 FT.    
THURSDAY NIGHT  
NORTH WINDS TO 30 KT BECOMING NORTHEAST 15 TO  
25 KT LATE IN THE EVENING, THEN DIMINISHING TO 10 TO 20 KT AFTER  
MIDNIGHT BECOMING NORTHEAST 10 TO 20 KT LATE. PATCHY SMOKE IN THE  
EVENING. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO  
7 FT OCCASIONALLY TO 9 FT.    
FRIDAY  
NORTHEAST WINDS 10 TO 20 KT BECOMING NORTH. WAVES 3 TO  
5 FT SUBSIDING TO 2 TO 4 FT.    
FRIDAY NIGHT  
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST 10 TO  
15 KT. WAVES 2 TO 4 FT.    
SATURDAY  
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH 10 TO  
15 KT. WAVES 1 TO 3 FT.    
SATURDAY NIGHT  
NORTH WINDS 5 TO 10 KT VEERING TO SOUTH. WAVES  
1 FT OR LESS.    
SUNDAY  
SOUTHEAST WINDS 5 TO 10 KT BECOMING SOUTH. WAVES 1 FT  
OR LESS.    
MONDAY  
SOUTHEAST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.  
WAVES 1 TO 2 FT.  
 
 
 
LMZ761-310315-  
MAFOR 3022/  
MICHIGAN NORTH 11830 15130 11140. WAVES 2 TO 4 FEET BUILDING TO 3  
TO 6 FEET TONIGHT. WAVES 3 TO 6 FEET THURSDAY.  
 
MICHIGAN SOUTH 13136 14130 11840. WAVES 3 TO 6 FEET BUILDING TO 4  
TO 7 FEET TONIGHT. WAVES 4 TO 7 FEET SUBSIDING TO 3 TO 6 FEET  
THURSDAY.  
 
 
 
PATTERSON  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MKX/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
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