606  
FZUS63 KLOT 202045  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  
245 PM CST MON NOV 20 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
 
HIGH PRESSURE OF 30.2 INCHES ACROSS THE SOUTHEASTERN  
STATES WILL MOVE TO THE EAST TONIGHT WHILE LOW PRESSURE OF 29.2  
INCHES MOVES FROM SOUTHERN MANITOBA TO ONTARIO TONIGHT, AND TO  
QUEBEC LATE TUESDAY. BROAD HIGH PRESSURE OF 30.4 INCHES WILL BUILD  
ACROSS THE CENTRAL AND NORTHERN GREAT PLAINS TUESDAY AND  
GRADUALLY SHIFT TO THE LOWER MISSISSIPPI VALLEY THURSDAY, WHILE A  
TROUGH OF LOW PRESSURE AVERAGING 29.7 INCHES MOVES ACROSS ONTARIO  
AND THE GREAT LAKES.  
 
LMZ261-362-364-366-563-565-567-868-210430-  
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-  
245 PM CST MON NOV 20 2017  
 
SHEBOYGAN WI TO PENTWATER MI NORTH...  
   
..GALE WARNING IN EFFECT THROUGH TUESDAY AFTERNOON
 
 
   
TONIGHT
 
SOUTHWEST GALES TO 40 KT. WAVES 8 TO 11 FT  
OCCASIONALLY TO 14 FT BUILDING TO 12 TO 16 FT OCCASIONALLY TO 21  
FT.    
TUESDAY
 
WEST GALES TO 40 KT BECOMING NORTHWEST GALES TO 35 KT.  
CHANCE OF SNOW SHOWERS IN THE AFTERNOON. WAVES 10 TO 14 FT  
OCCASIONALLY TO 18 FT SUBSIDING TO 6 TO 9 FT OCCASIONALLY TO  
12 FT.    
TUESDAY NIGHT
 
NORTHWEST WINDS TO 30 KT. WAVES 5 TO 8 FT  
OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT OCCASIONALLY TO  
9 FT.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KT BECOMING SOUTHWEST.  
WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO  
30 KT. WAVES 3 TO 5 FT.    
THURSDAY
 
WEST WINDS 15 TO 25 KT. WAVES 3 TO 5 FT.    
THURSDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST.  
WAVES 2 TO 4 FT.    
FRIDAY
 
SOUTHWEST GALES TO 35 KT INCREASING TO GALES TO 40 KT.  
CHANCE OF RAIN. WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT BUILDING TO  
7 TO 10 FT OCCASIONALLY TO 13 FT.    
SATURDAY
 
NORTHWEST WINDS TO 30 KT. CHANCE OF SNOW AND RAIN.  
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-210430-  
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-  
245 PM CST MON NOV 20 2017  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
..GALE WARNING IN EFFECT THROUGH TUESDAY AFTERNOON
 
 
   
TONIGHT
 
SOUTHWEST GALES TO 40 KT. WAVES 8 TO 12 FT  
OCCASIONALLY TO 16 FT BUILDING TO 12 TO 16 FT OCCASIONALLY TO 21  
FT.   
TUESDAY
 
WEST GALES TO 40 KT DIMINISHING TO GALES TO 35 KT LATE  
IN THE MORNING...THEN BECOMING NORTHWEST TO 30 KT IN THE  
AFTERNOON. WAVES 10 TO 14 FT OCCASIONALLY TO 18 FT SUBSIDING TO  
7 TO 10 FT OCCASIONALLY TO 13 FT.    
TUESDAY NIGHT
 
NORTHWEST WINDS TO 30 KT DIMINISHING TO 15 TO  
25 KT. WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KT BECOMING WEST 10 TO  
15 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO  
4 FT.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KT. WAVES 2 TO 4 FT.    
THURSDAY
 
SOUTHWEST WINDS 15 TO 25 KT BECOMING WEST 10 TO  
20 KT. WAVES 3 TO 5 FT.    
THURSDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST.  
WAVES 2 TO 4 FT.    
FRIDAY
 
SOUTHWEST WINDS TO 30 KT INCREASING TO GALES TO 35 KT.  
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 6 TO 9 FT  
OCCASIONALLY TO 12 FT.    
SATURDAY
 
NORTHWEST WINDS TO 30 KT. WAVES 6 TO 9 FT  
OCCASIONALLY TO 12 FT.  
 

 
 
LMZ761-210430-  
MAFOR 2022/  
MICHIGAN NORTH...GALE WARNING IN EFFECT...14550 13650 11750.  
CHANCE OF SNOW SHOWERS EARLY TUESDAY AFTERNOON. WAVES 8 TO 11  
FEET OCCASIONALLY TO 14 FEET BUILDING TO 12 TO 16 FEET  
OCCASIONALLY TO 21 FEET TONIGHT. WAVES 10 TO 14 FEET OCCASIONALLY  
TO 18 FEET SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 12 FEET  
TUESDAY.  
 
MICHIGAN SOUTH...GALE WARNING IN EFFECT...14550 11550 12650  
11740. WAVES 8 TO 12 FEET OCCASIONALLY TO 16 FEET BUILDING TO 12  
TO 16 FEET OCCASIONALLY TO 21 FEET TONIGHT. WAVES 10 TO 14 FEET  
OCCASIONALLY TO 18 FEET SUBSIDING TO 7 TO 10 FEET OCCASIONALLY TO  
13 FEET TUESDAY.  
 

 
 
RODRIGUEZ  
 
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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