200  
FZUS63 KMQT 131407  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1007 AM EDT THU AUG 13 2020  
 
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
 
THE SOUTHWEST EXTENSION OF THE HUDSON BAY HIGH WILL  
KEEP A 30.1 INCH RIDGE OVER THE REGION THROUGH FRIDAY. ON  
SATURDAY, A WEAKENING 29.8 INCH TROUGH WILL MOVE EAST ACROSS LAKE  
SUPERIOR. AS A SECOND TROUGH OF 29.8 INCHES SWEEPS ACROSS LAKE  
SUPERIOR LATER IN THE WEEKEND, A 30.1 INCH SURFACE HIGH WILL BUILD  
INTO THE UPPER MISSISSIPPI VALLEY EARLY NEXT WEEK.  
 
LSZ162-132215-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1007 AM EDT THU AUG 13 2020 /907 AM CDT THU AUG 13 2020/  
   
REST OF TODAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST IN  
THE AFTERNOON. ISOLATED THUNDERSTORMS BY LATE MORNING. ISOLATED  
SHOWERS. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET.    
TONIGHT
 
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER  
MIDNIGHT, THEN BECOMING SOUTH 5 TO 15 KNOTS LATE. A CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET,  
THEN BUILDING TO 1 TO 3 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS.  
WAVES CALM TO 2 FEET.    
SATURDAY
 
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES  
BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.  
 

 
 
LSZ263-132215-  
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-  
1007 AM EDT THU AUG 13 2020  
   
REST OF TODAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST  
LATE. ISOLATED THUNDERSTORMS BY LATE MORNING. ISOLATED SHOWERS.  
WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN VEERING SOUTH LATE. A SLIGHT CHANCE  
OF SHOWERS AND THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY
 
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES  
BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.  
 

 
 
LSZ264-132215-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1007 AM EDT THU AUG 13 2020  
   
REST OF TODAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE. A  
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES  
BUILDING TO 1 TO 3 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH  
EARLY AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING  
TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING  
TO 1 TO 3 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST BY MID  
AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
SUNDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES  
BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ265-132215-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1007 AM EDT THU AUG 13 2020  
   
REST OF TODAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT, THEN VEERING SOUTH LATE. WAVES CALM TO  
2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTH  
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING WEST BY MID  
AFTERNOON. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON. A CHANCE  
OF THUNDERSTORMS. SHOWERS LIKELY BY MID AFTERNOON. WAVES CALM TO  
2 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES CALM  
TO 2 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO  
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ266-132215-  
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-  
1007 AM EDT THU AUG 13 2020  
   
REST OF TODAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST IN  
THE AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. ISOLATED  
SHOWERS BY LATE MORNING. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS  
AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
SATURDAY
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SUNDAY
 
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 2 TO  
4 FEET, THEN SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ267-132215-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1007 AM EDT THU AUG 13 2020  
   
REST OF TODAY
 
EAST WINDS 5 TO 15 KNOTS. ISOLATED SHOWERS BY  
LATE MORNING. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO  
2 TO 4 FEET.    
SATURDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH BY MID  
AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS VEERING WEST AFTER  
MIDNIGHT. SHOWERS LIKELY THROUGH MIDNIGHT. A CHANCE OF  
THUNDERSTORMS. A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES CALM TO  
2 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES  
BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,  
THEN SUBSIDING TO 1 TO 3 FEET.  
 

 
 
LSZ261-132215-  
MAFOR 1315/  
SUPERIOR WEST 11310 13210 11310 12410 11310. A CHANCE OF SHOWERS  
AND THUNDERSTORMS OVERNIGHT AND FRIDAY MORNING. WAVES 1 TO 3  
FEET.  
 
SUPERIOR NORTH CENTRAL 15310 11310 11410. WAVES 1 TO 3 FEET.  
 
SUPERIOR SOUTH CENTRAL 15310 11310 11300. WAVES 1 TO 2 FEET.  
 
SUPERIOR EAST 12200 11210 11300 14310. WAVES 2 FEET OR LESS.  
 

 
 
NJL  
 
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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