914  
FZUS63 KLOT 230141  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
841 PM CDT SUN APR 22 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
 
EXPANSIVE HIGH PRESSURE OF 30.5 INCHES OVER THE  
EASTERN GREAT LAKES WILL DRIFT TO OFFSHORE OF THE NORTHEAST BY  
MONDAY EVENING. MEANWHILE, LOW PRESSURE OF 29.8 INCHES OVER THE  
LOWER MISSISSIPPI VALLEY WILL GRADUALLY WEAKEN AS IT DRIFTS  
NORTHEAST THROUGH MONDAY. LOW PRESSURE PASSING WELL TO THE NORTH  
OVER HUDSON BAY WILL USHER A COLD FRONT ACROSS THE LAKE TUESDAY.  
WEAKENING HIGH PRESSURE OF 30.2 INCHES WILL THEN MOVE OVER THE  
LAKE ON WEDNESDAY NIGHT. THIS WILL BE FOLLOWED BY LOW PRESSURE  
MOVING FROM THE CANADIAN PRAIRIES TO THE GREAT LAKES LATE IN THE  
WEEK.  
 
LMZ261-362-364-366-563-565-567-868-230915-  
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-  
841 PM CDT SUN APR 22 2018  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
REST OF TONIGHT
 
NORTHEAST WINDS 10 TO 15 KT VEERING TO SOUTH.  
WAVES 1 TO 2 FT.    
MONDAY
 
SOUTHEAST WINDS 5 TO 10 KT BACKING TO NORTHEAST 10 TO  
15 KT. WAVES 1 TO 2 FT.    
MONDAY NIGHT
 
NORTHEAST WINDS 10 TO 15 KT BECOMING EAST. WAVES  
1 TO 3 FT SUBSIDING TO 1 TO 2 FT.    
TUESDAY
 
NORTHEAST WINDS LESS THAN 10 KT BECOMING NORTH 10 TO  
20 KT IN THE AFTERNOON. WAVES 1 TO 2 FT.    
TUESDAY NIGHT
 
NORTH WINDS TO 30 KT. WAVES 3 TO 5 FT BUILDING  
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.    
WEDNESDAY
 
NORTH WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT IN  
THE AFTERNOON. WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 10 KT BECOMING SOUTHWEST.  
WAVES 1 TO 3 FT SUBSIDING TO 1 TO 2 FT.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES  
2 TO 4 FT.    
FRIDAY
 
NORTH WINDS 15 TO 25 KT. WAVES 4 TO 6 FT OCCASIONALLY  
TO 8 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-230915-  
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-  
841 PM CDT SUN APR 22 2018  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
REST OF TONIGHT
 
NORTHEAST WINDS 10 TO 20 KT BECOMING EAST.  
WAVES 1 TO 3 FT.    
MONDAY
 
NORTHEAST WINDS 10 TO 15 KT BECOMING NORTH 10 TO 20 KT.  
WAVES 1 TO 3 FT.    
MONDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KT BECOMING EAST 10 TO  
15 KT LATE IN THE EVENING, THEN DIMINISHING TO 5 TO 10 KT AFTER  
MIDNIGHT BECOMING EAST 5 TO 10 KT LATE. WAVES 1 TO 3 FT.    
TUESDAY
 
NORTHEAST WINDS 5 TO 10 KT BECOMING NORTH. CHANCE OF  
RAIN IN THE MORNING. WAVES 1 TO 2 FT.    
TUESDAY NIGHT
 
NORTH WINDS TO 30 KT. WAVES 3 TO 5 FT BUILDING  
TO 4 TO 7 FT OCCASIONALLY TO 9 FT.    
WEDNESDAY
 
NORTH WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.  
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.    
WEDNESDAY NIGHT
 
NORTH WINDS 10 TO 20 KT BECOMING WEST 5 TO  
10 KT OVERNIGHT. WAVES 3 TO 5 FT SUBSIDING TO 2 TO 4 FT.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KT BECOMING SOUTH. WAVES  
1 TO 3 FT.    
FRIDAY
 
NORTH WINDS 15 TO 25 KT. CHANCE OF RAIN. WAVES 4 TO  
7 FT OCCASIONALLY TO 9 FT.  
 

 
LMZ761-230915-  
MAFOR 2303/  
MICHIGAN NORTH 11210 11310 11410 11310 11210 13110. WAVES 1 TO  
2 FT.  
 
MICHIGAN SOUTH 14220 11110 13120. WAVES 1 TO 3 FT.  
 

 
 
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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