891  
FZUS63 KLOT 221952  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
252 PM CDT TUE AUG 22 2017  
 
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
 
LOW PRESSURE OF 29.4 INCHES OVER WEST CENTRAL QUEBEC  
WILL GRADUALLY SHIFT NORTHEASTWARD WHILE DEEPEN TO 29.2 INCHES  
TONIGHT. THE LOW WILL THEN FILL BACK TO 29.4 INCHES WHILE  
GRADUALLY SHIFTING EASTWARD ACROSS THE PROVIDENCE THROUGH EARLY  
THURSDAY MORNING. FARTHER WEST, HIGH PRESSURE OF 30.1 INCHES WILL  
CONTINUE TO SPREAD SOUTHEAST OVER THE PLAINS TONIGHT. THE HIGH  
WILL EVENTUALLY DRIFT EAST TO THE WESTERN LAKES BY EARLY THURSDAY,  
THEN WILL REMAIN IN PLACE AND STRENGTHEN TO 30.2 INCHES WHILE  
DRIFTING VERY SLOWLY EAST INTO SATURDAY.  
 
LMZ261-362-364-366-563-565-567-868-230330-  
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-  
252 PM CDT TUE AUG 22 2017  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
TONIGHT
 
NORTHWEST WINDS 15 TO 25 KT. WAVES 4 TO 6 FT  
OCCASIONALLY TO 8 FT.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. WAVES  
4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO  
20 KT. WAVES 2 TO 4 FT.    
THURSDAY
 
NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
THURSDAY NIGHT
 
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST  
10 TO 15 KT. WAVES 1 TO 3 FT.    
FRIDAY
 
NORTH WINDS 5 TO 10 KT INCREASING TO 10 TO 15 KT. WAVES  
2 FT OR LESS.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST. WAVES  
2 FT OR LESS.    
SATURDAY
 
EAST WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
SUNDAY
 
SOUTH WINDS 10 TO 15 KT BECOMING SOUTHEAST. WAVES 1 TO  
2 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-230330-  
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-  
252 PM CDT TUE AUG 22 2017  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
TONIGHT
 
NORTHWEST WINDS 15 TO 25 KT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH. WAVES  
4 TO 7 FT OCCASIONALLY TO 9 FT SUBSIDING TO 3 TO 5 FT.    
WEDNESDAY NIGHT
 
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST.  
WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.    
THURSDAY
 
NORTH WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
THURSDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KT DIMINISHING TO  
10 TO 15 KT. WAVES 2 TO 4 FT.    
FRIDAY
 
NORTHEAST WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 10 KT BECOMING EAST. WAVES  
2 FT OR LESS.    
SATURDAY
 
EAST WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
SUNDAY
 
SOUTHEAST WINDS 10 TO 20 KT BECOMING EAST 10 TO 15 KT.  
WAVES 1 TO 2 FT.  
 

 
 
LMZ761-230330-  
MAFOR 2221/  
MICHIGAN NORTH 14730 11730 13720. WAVES 4 TO 6 FEET OCCASIONALLY  
TO 8 FEET TONIGHT...SUBSIDING TO 2 TO 4 FEET WEDNESDAY.  
 
MICHIGAN SOUTH 14730 11730 12720 11820. WAVES 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET TONIGHT. WAVES 4 TO 7 FT OCCASIONALLY TO  
9 FT SUBSIDING TO 3 TO 5 FT WEDNESDAY.  
 

 
 
KJB  
 
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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