420  
FZUS63 KMQT 162007  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
407 PM EDT THU AUG 16 2018  
 
FOR WATERS BEYOND 5 NAUTICAL MILES OF SHORE ON LAKE SUPERIOR.  
 
WAVES ARE THE SIGNIFICANT WAVE HEIGHT - THE AVERAGE OF THE  
HIGHEST 1/3 OF THE WAVE SPECTRUM. OCCASIONAL WAVE HEIGHT IS THE  
AVERAGE OF THE HIGHEST 1/10 OF THE WAVE SPECTRUM.  
   
SYNOPSIS
 
A WEAK 30.0 INCH RIDGE REMAINS OVER THE UPPER GREAT  
LAKES TONIGHT. A 30.2 INCH RIDGE WILL SHIFT INTO NORTHWESTERN  
ONTARIO ON FRIDAY MORNING WHILE A 29.8 INCH LOW PASSES ACROSS  
LOWER MICHIGAN BEFORE TRACKING INTO NEW ENGLAND LATE FRIDAY INTO  
SATURDAY MORNING. THE RIDGE BUILDS TO 30.3 INCHES ON FRIDAY  
AFTERNOON AS IT SLOWLY SHIFTS EASTWARD OVER JAMES BAY INTO  
SATURDAY. THE NEXT TROUGH AT 29.9 INCHES MOVES ACROSS LAKE  
SUPERIOR LATE SUNDAY INTO SUNDAY NIGHT. MONDAY INTO TUESDAY, A  
29.6 INCH LOW LIFTS INTO THE GREAT LAKES REGION.  
 
LSZ162-170415-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
407 PM EDT THU AUG 16 2018 /307 PM CDT THU AUG 16 2018/  
   
LATE THIS AFTERNOON
 
EAST WINDS LESS THAN 10 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT, THEN DIMINISHING TO LESS THAN 10 KNOTS LATE. WAVES CALM  
TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS  
THAN 10 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS LESS THAN 10 KNOTS. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
EAST WINDS LESS THAN 10 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS LESS THAN 10 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT. A CHANCE OF  
THUNDERSTORMS. SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO  
1 TO 3 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ263-170415-  
LAKE SUPERIOR FROM SAXON HARBOR WI TO UPPER ENTRANCE TO PORTAGE  
CANAL MI 5NM OFF SHORE TO THE US/CANADIAN BORDER INCLUDING ISLE  
ROYALE NATIONAL PARK-  
407 PM EDT THU AUG 16 2018  
   
LATE THIS AFTERNOON
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 2 TO  
4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS  
THAN 10 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS LESS THAN 10 KNOTS VEERING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS LESS THAN 10 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTHWEST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT. A CHANCE OF  
THUNDERSTORMS. SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO  
1 TO 3 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ264-170415-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
407 PM EDT THU AUG 16 2018  
   
LATE THIS AFTERNOON
 
SOUTH WINDS LESS THAN 10 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTH WINDS LESS THAN 10 KNOTS BECOMING SOUTHWEST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. WAVES  
BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO  
20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES CALM TO 2 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO  
25 KNOTS. SHOWERS LIKELY. WAVES BUILDING TO 2 TO 4 FEET.    
TUESDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ265-170415-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
407 PM EDT THU AUG 16 2018  
   
LATE THIS AFTERNOON
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTHEAST WINDS LESS THAN 10 KNOTS VEERING SOUTHWEST  
LATE. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO  
15 KNOTS IN THE AFTERNOON, THEN BECOMING NORTH 10 TO 20 KNOTS  
LATE. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT, THEN VEERING NORTHEAST LATE. WAVES  
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH. A CHANCE  
OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
TUESDAY
 
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING  
TO CALM TO 2 FEET.  
 

 
 
LSZ266-170415-  
LAKE SUPERIOR EAST OF A LINE FROM MANITOU ISLAND TO MARQUETTE MI  
AND WEST OF A LINE FROM GRAND MARAIS MI TO THE US/CANADIAN BORDER  
BEYOND 5NM FROM SHORE-  
407 PM EDT THU AUG 16 2018  
   
LATE THIS AFTERNOON
 
NORTHEAST WINDS LESS THAN 10 KNOTS. WAVES  
CALM TO 2 FEET.    
TONIGHT
 
NORTHEAST WINDS LESS THAN 10 KNOTS BACKING NORTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS  
LATE. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST  
AFTER MIDNIGHT. WAVES 1 TO 3 FEET.    
SATURDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. A CHANCE OF SHOWERS. A CHANCE OF THUNDERSTORMS AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH. A CHANCE  
OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
TUESDAY
 
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING  
TO 1 TO 3 FEET.  
 

 
 
LSZ267-170415-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
407 PM EDT THU AUG 16 2018  
   
LATE THIS AFTERNOON
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST  
AFTER MIDNIGHT, THEN DIMINISHING TO 5 TO 15 KNOTS LATE. WAVES  
BUILDING TO 1 TO 3 FEET.    
SATURDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST BY  
MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.  
WAVES CALM TO 2 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
TUESDAY
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,  
THEN SUBSIDING TO 1 TO 3 FEET.  
 

 
 
LSZ261-170415-  
MAFOR 1621/  
SUPERIOR WEST 12400 12500 11600 11810 12110. WAVES 1 FOOT OR LESS  
TONIGHT. WAVES 1 TO 3 FEET FRIDAY.  
 
SUPERIOR NORTH CENTRAL 14400 11300 12100 11800. WAVES 2 FEET OR  
LESS.  
 
SUPERIOR SOUTH CENTRAL 12200 11300 11400 11700 12100 11800. WAVES  
1 FOOT OR LESS.  
 
SUPERIOR EAST 11100 14800 11800 12700. WAVES 1 FOOT OR LESS.  
 

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