033  
FZUS63 KMKX 270805  
GLFLM  
 
OPEN LAKE FORECAST FOR LAKE MICHIGAN  
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  
305 AM CDT TUE OCT 27 2020  
 
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 AROUND 30.5 INCHES WILL CONTINUE TO MOVE SOUTH  
INTO THE SOUTHERN PLAINS THROUGH TODAY, WHILE A SURFACE LOW  
AVERAGING 29.5 INCHES DEVELOPS IN THE LEE OF THE CANADIAN  
ROCKIES. THIS SURFACE LOW WILL WEAKEN SLIGHTLY AS IT TRACKS EAST  
ACROSS CENTRAL CANADA AND MERGES WITH ANOTHER SURFACE LOW OVER THE  
HUDSON BAY ON WEDNESDAY. AS THIS HAPPENS, A PERIOD OF SOUTHWEST  
GALES APPEAR LIKELY ACROSS THE NORTHERN THIRD OF THE LAKE LATE  
TONIGHT AND INTO WEDNESDAY. BEHIND THE DEPARTING SURFACE LOW, HIGH  
PRESSURE OF 30.2 INCHES MOVES IN ACROSS THE UPPER GREAT LAKES.  
 

 
 
LMZ261-362-364-366-563-565-271515-  
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-  
305 AM CDT TUE OCT 27 2020  
 
TWO RIVERS WI TO MANISTEE MI NORTH...  
 
...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY  
MORNING...  
   
TODAY
 
WEST WINDS 10 TO 15 KT INCREASING TO 10 TO 20 KT EARLY  
THIS AFTERNOON, THEN BECOMING SOUTHWEST 15 TO 25 KT LATE. CHANCE  
OF RAIN AND SNOW SHOWERS THIS MORNING. WAVES 2 TO 4 FT BUILDING  
TO 4 TO 6 FT OCCASIONALLY TO 8 FT.    
TONIGHT
 
SOUTHWEST WINDS TO 30 KT INCREASING TO GALES TO 40 KT.  
WAVES 4 TO 7 FT OCCASIONALLY TO 9 FT BUILDING TO 8 TO 12 FT  
OCCASIONALLY TO 16 FT.    
WEDNESDAY
 
SOUTHWEST GALES TO 35 KT BECOMING WEST 15 TO 25 KT.  
WAVES 8 TO 12 FT OCCASIONALLY TO 16 FT SUBSIDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KT BECOMING NORTH.  
WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT SUBSIDING TO 2 TO 4 FT.    
THURSDAY
 
NORTH WINDS 10 TO 20 KT BECOMING NORTHEAST 15 TO  
25 KT. WAVES 2 TO 4 FT.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO  
20 KT. WAVES 3 TO 5 FT.    
FRIDAY
 
NORTH WINDS 10 TO 20 KT BECOMING NORTHWEST 10 TO 15 KT.  
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.    
SATURDAY
 
SOUTH GALES TO 45 KT. WAVES 4 TO 6 FT OCCASIONALLY TO  
8 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.  
 

 
 
LMZ567-868-271515-  
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-  
305 AM CDT TUE OCT 27 2020  
 
TWO RIVERS WI TO MANISTEE MI SOUTH TO SHEBOYGAN WI TO PENTWATER  
MI...  
   
TODAY
 
WEST WINDS 10 TO 15 KT BECOMING SOUTHWEST 10 TO 20 KT.  
CHANCE OF RAIN AND SNOW SHOWERS THIS MORNING. WAVES 1 TO 3 FT.    
TONIGHT
 
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 30 KT. WAVES  
3 TO 5 FT BUILDING TO 6 TO 9 FT OCCASIONALLY TO 12 FT.    
WEDNESDAY
 
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.  
WAVES 6 TO 9 FT OCCASIONALLY TO 12 FT SUBSIDING TO 4 TO 6 FT  
OCCASIONALLY TO 8 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 20 KT BECOMING NORTH 10 TO  
15 KT. WAVES 3 TO 5 FT SUBSIDING TO 1 TO 3 FT.    
THURSDAY
 
NORTHEAST WINDS 10 TO 20 KT INCREASING TO 15 TO  
25 KT. WAVES 3 TO 5 FT.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KT DIMINISHING TO 10 TO  
20 KT. WAVES 3 TO 5 FT.    
FRIDAY
 
NORTH WINDS 10 TO 20 KT DIMINISHING TO 10 TO 15 KT.  
WAVES 2 TO 4 FT SUBSIDING TO 1 TO 3 FT.    
SATURDAY
 
SOUTH WINDS TO 30 KT. WAVES 3 TO 5 FT BUILDING TO  
4 TO 6 FT OCCASIONALLY TO 8 FT.  
 

 
 
LMZ080-669-671-673-675-777-779-870-872-874-876-878-271515-  
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-  
305 AM CDT TUE OCT 27 2020  
 
SHEBOYGAN WI TO PENTWATER MI SOUTH...  
   
TODAY
 
NORTHWEST WINDS 10 TO 15 KT BECOMING WEST. CHANCE OF  
RAIN SHOWERS THIS MORNING. WAVES 1 TO 3 FT.    
TONIGHT
 
WEST WINDS 10 TO 20 KT BECOMING SOUTHWEST TO 30 KT.  
WAVES 2 TO 4 FT BUILDING TO 5 TO 8 FT OCCASIONALLY TO 10 FT.    
WEDNESDAY
 
SOUTHWEST WINDS TO 30 KT DIMINISHING TO 10 TO 20 KT.  
WAVES 5 TO 8 FT OCCASIONALLY TO 10 FT SUBSIDING TO 4 TO 7 FT  
OCCASIONALLY TO 9 FT.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 20 KT VEERING TO NORTH. WAVES  
3 TO 5 FT SUBSIDING TO 1 TO 3 FT.    
THURSDAY
 
NORTHEAST WINDS 10 TO 20 KT INCREASING TO 30 KT IN  
THE AFTERNOON. WAVES 2 TO 4 FT BUILDING TO 3 TO 5 FT.    
THURSDAY NIGHT
 
NORTH WINDS TO 30 KT DIMINISHING TO 15 TO  
25 KT. WAVES 4 TO 6 FT OCCASIONALLY TO 8 FT.    
FRIDAY
 
NORTH WINDS 10 TO 20 KT. WAVES 4 TO 6 FT OCCASIONALLY  
TO 8 FT SUBSIDING TO 3 TO 5 FT.    
SATURDAY
 
SOUTH WINDS TO 30 KT. WAVES 2 TO 4 FT BUILDING TO  
4 TO 6 FT OCCASIONALLY TO 8 FT.  
 

 
 
LMZ761-271515-  
MAFOR 2709/  
MICHIGAN NORTH...GALE WARNING IN EFFECT...11710 11610 11620 11520  
11530 11540 12550. CHANCE OF RAIN AND SNOW SHOWERS THIS MORNING.  
WAVES 1 TO 3 FEET BUILDING TO 3 TO 5 FEET TODAY. WAVES 4 TO 7  
FEET BUILDING TO 8 TO 11 FEET THE REST OF TONIGHT.  
 
MICHIGAN SOUTH 11710 13610 11620 11630 12540. CHANCE OF RAIN  
SHOWERS THIS MORNING. WAVES 1 TO 3 FEET TODAY. WAVES 2 TO 4 FEET  
BUILDING TO 4 TO 7 FEET THE REST OF TONIGHT.  
 

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