313  
FZUS63 KMKX 210450  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  
1150 PM CDT FRI SEP 20 2019  
 
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
 
 
HIGH PRESSURE OF 30.2 INCHES REMAINS NEARLY STATIONARY ACROSS THE  
EASTERN SEABOARD. THIS WILL FEED SOUTHERLY WINDS INTO THE GREAT  
LAKES AHEAD OF LOW PRESSURE OF 29.5, WHICH WILL LIFT FROM EASTERN  
COLORADO INTO SOUTH DAKOTA TONIGHT INTO TOMORROW. WINDS WILL  
BECOME GUSTY TOMORROW AFTERNOON INTO TOMORROW NIGHT. GUSTS MAY  
APPROACH 30 KTS. A COLD FRONT WILL SWEEP ACROSS LAKE MICHIGAN  
SUNDAY AFTERNOON. LOOK FOR WINDS TO VEER TO THE SOUTHWEST THEN  
WEST ON SUNDAY, TURNING NORTHWEST SUNDAY NIGHT INTO MONDAY. LIGHT  
WINDS RETURN BY MONDAY AFTERNOON AS HIGH PRESSURE MOVES OVERHEAD.  
 

 
 
LMZ261-362-364-366-563-565-567-868-210915-  
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-  
1150 PM CDT FRI SEP 20 2019  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
..DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT SATURDAY
 
 
   
REST OF TONIGHT
 
EAST WINDS LESS THAN 10 KT BECOMING SOUTH.  
PATCHY FOG. WAVES 1 FT OR LESS.    
SATURDAY
 
SOUTH WINDS 10 TO 15 KT INCREASING TO 30 KT. CHANCE  
OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO 2 FT  
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.    
SATURDAY NIGHT
 
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST. CHANCE  
OF SHOWERS AND THUNDERSTORMS IN THE EVENING, THEN SHOWERS LIKELY  
WITH A CHANCE OF THUNDERSTORMS OVERNIGHT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT.    
SUNDAY
 
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY  
TO 9 FT SUBSIDING TO 4 TO 6 FT OCCASIONALLY TO 8 FT.    
SUNDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST. CHANCE  
OF SHOWERS AND THUNDERSTORMS IN THE EVENING, THEN CHANCE OF  
SHOWERS OVERNIGHT. WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.   
MONDAY
 
NORTHWEST WINDS 10 TO 20 KT. WAVES 1 TO 3 FT.    
MONDAY NIGHT
 
NORTHWEST WINDS 5 TO 10 KT BECOMING WEST. WAVES  
1 TO 2 FT.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 15 KT INCREASING TO 15 TO 25 KT.  
WAVES 1 TO 2 FT BUILDING TO 1 TO 3 FT.    
WEDNESDAY
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
CHANCE OF SHOWERS. WAVES 3 TO 5 FT BUILDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.  
 

 
 
LMZ669-671-673-870-210915-  
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 WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID  
LAKE-  
1150 PM CDT FRI SEP 20 2019  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH TO WIND POINT WI TO HOLLAND  
MI...  
   
..DENSE FOG ADVISORY IN EFFECT UNTIL 7 AM CDT SATURDAY
 
 
   
REST OF TONIGHT
 
SOUTHEAST WINDS LESS THAN 10 KT BECOMING SOUTH  
10 TO 15 KT. PATCHY FOG. WAVES 1 TO 2 FT.    
SATURDAY
 
SOUTH WINDS 10 TO 15 KT INCREASING TO 30 KT. CHANCE  
OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO 3 FT  
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.    
SATURDAY NIGHT
 
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST.  
SHOWERS AND THUNDERSTORMS LIKELY IN THE EVENING, THEN SHOWERS  
WITH THUNDERSTORMS LIKELY OVERNIGHT. WAVES 5 TO 8 FT OCCASIONALLY  
TO 10 FT.    
SUNDAY
 
SOUTHWEST WINDS TO 30 KT. SHOWERS WITH A CHANCE OF  
THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.    
SUNDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST.  
SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS IN THE EVENING,  
THEN CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT. WAVES 4 TO  
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
MONDAY NIGHT
 
WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.  
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.    
TUESDAY
 
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 10 TO 20 KT.  
WAVES 1 TO 3 FT.    
WEDNESDAY
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
CHANCE OF SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.  
 

 
 
LMZ080-675-777-779-872-874-876-878-210915-  
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-  
1150 PM CDT FRI SEP 20 2019  
 
WIND POINT WI TO HOLLAND MI SOUTH...  
   
REST OF TONIGHT
 
SOUTHEAST WINDS LESS THAN 10 KT BECOMING SOUTH  
10 TO 15 KT. WAVES 1 TO 2 FT.    
SATURDAY
 
SOUTH WINDS 10 TO 15 KT INCREASING TO 30 KT. CHANCE  
OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO 3 FT  
BUILDING TO 4 TO 7 FT OCCASIONALLY TO 9 FT.    
SATURDAY NIGHT
 
SOUTH WINDS TO 30 KT BECOMING SOUTHWEST.  
SHOWERS AND THUNDERSTORMS LIKELY IN THE EVENING, THEN SHOWERS  
WITH THUNDERSTORMS LIKELY OVERNIGHT. WAVES 5 TO 8 FT OCCASIONALLY  
TO 10 FT.    
SUNDAY
 
SOUTHWEST WINDS TO 30 KT. SHOWERS WITH A CHANCE OF  
THUNDERSTORMS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.    
SUNDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING NORTHWEST.  
SHOWERS LIKELY WITH A CHANCE OF THUNDERSTORMS IN THE EVENING,  
THEN CHANCE OF SHOWERS AND THUNDERSTORMS OVERNIGHT. WAVES 4 TO  
6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
MONDAY NIGHT
 
WEST WINDS 10 TO 15 KT DIMINISHING TO 5 TO 10 KT.  
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 2 FT.    
TUESDAY
 
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 10 TO 20 KT.  
WAVES 1 TO 3 FT.    
WEDNESDAY
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
CHANCE OF SHOWERS. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.  
 

 
LMZ761-210915-  
MAFOR 2106 AMD/  
MICHIGAN NORTH 11300 19304 11400 19404 13420 11430 11436. CHANCE  
OF SHOWERS AND THUNDERSTORMS SATURDAY AFTERNOON. CHANCE OF  
THUNDERSTORMS SATURDAY EVENING. WAVES 1 FOOT OR LESS OVERNIGHT.  
WAVES 1 FOOT OR LESS BUILDING TO 3 TO 6 FEET SATURDAY. WAVES 5 TO  
8 FEET SATURDAY EVENING.  
 
MICHIGAN SOUTH 12400 19404 11410 13420 11429. CHANCE OF SHOWERS  
AND THUNDERSTORMS SATURDAY AFTERNOON. WAVES 1 FOOT OR LESS  
OVERNIGHT. WAVES 1 TO 3 FEET BUILDING TO 3 TO 6 FEET SATURDAY.  
WAVES 4 TO 7 FEET SATURDAY EVENING.  
 

 
 
BOXELL  
 
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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