395  
FZUS63 KLOT 201942  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
242 PM CDT FRI APR 20 2018  
 
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 30.6 INCHES OVER THE WESTERN GREAT  
LAKES WILL DRIFT SLOWLY EAST ACROSS SOUTHWESTERN ONTARIO AND THE  
EASTERN LAKES THROUGH THE WEEKEND, WHILE WEAKER RIDGING OF 30.4  
INCHES LINGERS ACROSS THE UPPER MISSISSIPPI VALLEY. TWO AREAS OF  
LOW PRESSURE WILL PASS WELL TO THE NORTH AND WELL TO THE SOUTH OF  
THE LAKE, AS THIS RIDGE AXIS REMAINS IN PLACE ACROSS THE WESTERN  
LAKES INTO MONDAY. THE RIDGE WILL FINALLY MOVE EAST OF THE AREA  
TUESDAY, ALLOWING A COLD FRONT TO PUSH SOUTHEAST ACROSS THE LAKE  
TUESDAY NIGHT.  
 
LMZ261-362-364-366-563-565-567-868-210330-  
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-  
242 PM CDT FRI APR 20 2018  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
TONIGHT
 
SOUTHWEST WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.    
SATURDAY
 
SOUTH WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.    
SATURDAY NIGHT
 
SOUTH WINDS 5 TO 10 KT BECOMING EAST. WAVES  
1 TO 2 FT.    
SUNDAY
 
EAST WINDS 5 TO 10 KT BECOMING NORTHEAST. WAVES 1 FT OR  
LESS.   
SUNDAY NIGHT
 
EAST WINDS 5 TO 10 KT BECOMING SOUTHEAST. WAVES  
1 TO 2 FT.    
MONDAY
 
SOUTH WINDS 5 TO 10 KT BECOMING SOUTHWEST. WAVES 1 FT  
OR LESS.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 10 KT BECOMING SOUTHWEST. WAVES  
1 FT OR LESS.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT.  
WAVES 1 TO 3 FT.   
WEDNESDAY
 
NORTH WINDS 15 TO 25 KT. WAVES 4 TO 7 FT  
OCCASIONALLY TO 9 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-210330-  
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-  
242 PM CDT FRI APR 20 2018  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
TONIGHT
 
VARIABLE WINDS 5 TO 10 KT BECOMING EAST. WAVES 1 TO 2  
FT.   
SATURDAY
 
EAST WINDS LESS THAN 10 KT BECOMING NORTHEAST. WAVES  
AROUND 1 FT.    
SATURDAY NIGHT
 
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST. WAVES  
1 FT OR LESS.    
SUNDAY
 
EAST WINDS 5 TO 10 KT BECOMING NORTHEAST. WAVES 1 TO  
2 FT.    
SUNDAY NIGHT
 
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. WAVES  
1 TO 3 FT.    
MONDAY
 
EAST WINDS 10 TO 15 KT BECOMING NORTH. WAVES 1 TO 3 FT.   
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST. WAVES  
1 TO 2 FT.    
TUESDAY
 
SOUTH WINDS 5 TO 10 KT. WAVES AROUND 1 FT.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KT INCREASING TO 15 TO 25 KT.  
CHANCE OF RAIN. WAVES 3 TO 5 FT BUILDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.  
 

 
 
LMZ761-210330-  
MAFOR 2021/  
MICHIGAN NORTH 13510 12410 13400. WAVES 1 TO 2 FT.  
 
MICHIGAN SOUTH 11900 14200 13200. WAVES 1 TO 2 FT.  
 

 
 
RATZER  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/LOT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 
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