420  
FZUS63 KLOT 161944  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
244 PM CDT MON OCT 16 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
 
EXPANSIVE HIGH PRESSURE OF 30.4 INCHES OVER THE OHIO  
VALLEY WILL MOVE TO THE MID ATLANTIC COAST TUESDAY AND WEDNESDAY  
WHERE IT WILL REMAIN THROUGH FRIDAY. MEANWHILE, LOW PRESSURE OF  
29.4 INCHES WILL MOVE ACROSS NORTHERN MANITOBA THIS EVENING TO  
NORTHERN QUEBEC TUESDAY NIGHT. A SECOND, AND MUCH STRONGER LOW  
AVERAGING 28.8 INCHES WILL TAKE A SIMILAR TRACK ACROSS NORTHERN  
MANITOBA WEDNESDAY TO THE HUDSON BAY ON THURSDAY.  
 
LMZ261-362-364-366-563-565-567-669-868-870-170315-  
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 SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE  
TO MID LAKE-  
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID  
LAKE-  
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID  
LAKE-  
244 PM CDT MON OCT 16 2017  
 
PORT WASHINGTON WI TO WHITEHALL MI NORTH...  
 
...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH LATE  
WEDNESDAY NIGHT...  
   
TONIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES  
4 TO 6 FT OCCASIONALLY TO 8 FT BUILDING TO 6 TO 9 FT OCCASIONALLY  
TO 12 FT.    
TUESDAY
 
WEST WINDS TO 30 KT BECOMING SOUTHWEST 10 TO 20 KT.  
WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT SUBSIDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.    
TUESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT.    
WEDNESDAY
 
SOUTHWEST GALES TO 35 KT BECOMING SOUTH GALES TO  
40 KT. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT BUILDING TO 10 TO  
14 FT OCCASIONALLY TO 18 FT.    
WEDNESDAY NIGHT
 
SOUTHWEST GALES TO 40 KT BECOMING WEST TO  
30 KT OVERNIGHT. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT  
SUBSIDING TO 7 TO 10 FT OCCASIONALLY TO 13 FT.    
THURSDAY
 
WEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 20 KT.  
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.    
THURSDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST.  
WAVES 1 TO 3 FT.    
FRIDAY
 
SOUTH WINDS TO 30 KT. WAVES 3 TO 5 FT BUILDING TO 4 TO  
7 FT OCCASIONALLY TO 9 FT.    
SATURDAY
 
SOUTH WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO  
9 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.  
 

 
 
LMZ080-671-673-675-777-779-872-874-876-878-170315-  
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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 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-  
244 PM CDT MON OCT 16 2017  
 
PORT WASHINGTON WI TO WHITEHALL MI SOUTH...  
   
TONIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES  
2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.    
TUESDAY
 
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO 25 KT.  
WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT SUBSIDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.    
TUESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT.  
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.    
WEDNESDAY
 
SOUTHWEST WINDS TO 30 KT BECOMING SOUTH. WAVES 6 TO  
9 FT OCCASIONALLY TO 12 FT.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS TO 30 KT WITH OCCASIONAL GALES  
TO 35 KT IN THE EVENING. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.   
THURSDAY
 
WEST WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.  
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 1 TO 3 FT.    
THURSDAY NIGHT
 
SOUTHWEST WINDS 5 TO 10 KT BECOMING SOUTH 10 TO  
20 KT OVERNIGHT. WAVES 1 TO 2 FT.    
FRIDAY
 
SOUTH WINDS 15 TO 25 KT. WAVES 3 TO 5 FT.    
SATURDAY
 
SOUTH WINDS TO 30 KT. WAVES 4 TO 7 FT OCCASIONALLY TO  
9 FT.  
 

 
 
LMZ761-170315-  
MAFOR 1621/  
MICHIGAN NORTH 12530 13540 11640 11630 11530. WAVES 3 TO 5 FEET  
BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 12 FEET TONIGHT. WAVES 6  
TO 9 FEET OCCASIONALLY TO 12 FEET SUBSIDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET TUESDAY.  
 
MICHIGAN SOUTH 11520 12530 14540 11540. WAVES 2 TO 4 FEET  
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET TONIGHT. WAVES 6  
TO 9 FEET OCCASIONALLY TO 12 FEET TUESDAY SUBSIDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.  
 

 
 
LENNING  
 
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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