504  
FZUS63 KMQT 170150  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
950 PM EDT SAT OCT 16 2021  
 
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 29.3 INCH LOW OVER CENTRAL QUEBEC WILL CONTINUE TO  
LIFT NORTHWARD TONIGHT. HIGH PRESSURE AT 30.3 INCHES OVER THE  
ROCKIES WILL SHIFT SOUTHEAST TO THE SOUTHERN PLAINS SUNDAY,  
EXTENDING A 30.0 INCH RIDGE NORTH ACROSS THE UPPER MIDWEST. THIS  
RIDGE WILL SHIFT OVER LAKE SUPERIOR MONDAY, THEN MOVE SOUTH  
TUESDAY AS A 29.8 INCH TROUGH MOVES THROUGH THE UPPER GREAT LAKES  
WEDNESDAY AND THURSDAY.  
 

 
 
LSZ162-171000-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
950 PM EDT SAT OCT 16 2021 /850 PM CDT SAT OCT 16 2021/  
   
REST OF TONIGHT
 
WEST WINDS 15 TO 25 KNOTS. WAVES 2 TO 4 FEET  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
LATE. WAVES SUBSIDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.    
MONDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.  
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ263-171000-  
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-  
950 PM EDT SAT OCT 16 2021  
   
REST OF TONIGHT
 
WEST WINDS 20 TO 30 KNOTS. WAVES 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET.    
SUNDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS LATE. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
SUNDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.  
 

 
 
LSZ264-171000-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
950 PM EDT SAT OCT 16 2021  
   
REST OF TONIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES 4 TO  
8 FEET OCCASIONALLY TO 10 FEET, THEN SUBSIDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
SUNDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH  
5 TO 15 KNOTS AFTER MIDNIGHT, THEN BACKING NORTHWEST LATE. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
MONDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN SHOWERS.  
WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO 1 TO  
3 FEET.  
 

 
 
LSZ265-171000-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
950 PM EDT SAT OCT 16 2021  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES 4 TO  
7 FEET OCCASIONALLY TO 9 FEET.    
SUNDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO  
5 TO 15 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.    
MONDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO  
25 KNOTS. A CHANCE OF SHOWERS, THEN SHOWERS LIKELY. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST. A  
CHANCE OF SHOWERS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.  
 

 
 
LSZ266-171000-  
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-  
950 PM EDT SAT OCT 16 2021  
   
REST OF TONIGHT
 
NORTHWEST WINDS TO 30 KNOTS WITH A FEW GALE  
FORCE GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS  
AFTER MIDNIGHT. ISOLATED SHOWERS. WAVES 6 TO 10 FEET OCCASIONALLY  
TO 13 FEET.    
SUNDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE IN THE  
AFTERNOON, THEN DIMINISHING TO 20 TO 30 KNOTS LATE. ISOLATED  
SHOWERS. WAVES SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET,  
THEN BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT, THEN BECOMING NORTHWEST 10 TO  
20 KNOTS LATE. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. SHOWERS LIKELY. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.  
WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO 2 TO  
4 FEET.  
 

 
 
LSZ267-171000-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
950 PM EDT SAT OCT 16 2021  
   
REST OF TONIGHT
 
NORTHWEST WINDS TO 30 KNOTS WITH A FEW GALE  
FORCE GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS  
LATE. SCATTERED SHOWERS. WAVES 8 TO 11 FEET OCCASIONALLY TO  
14 FEET SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.    
SUNDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE IN THE  
AFTERNOON. SCATTERED SHOWERS. WAVES SUBSIDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET, THEN BUILDING TO 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS  
LATE. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
WEDNESDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO  
25 KNOTS. SHOWERS LIKELY. WAVES BUILDING TO 2 TO 4 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN  
SUBSIDING TO 2 TO 4 FEET.  
 

 
LSZ261-171000-  
MAFOR 1703/  
SUPERIOR WEST 13630 11730 13620 11610. WAVES 2 TO 5 FEET  
OVERNIGHT THROUGH SUNDAY SUBSIDING TO 1 TO 3 FEET SUNDAY EVENING.  
 
SUPERIOR NORTH CENTRAL 15730 11730 11720. WAVES 4 TO 7 FEET  
OVERNIGHT SUBSIDING TO 3 TO 6 FEET SUNDAY AND SUNDAY EVENING.  
 
SUPERIOR SOUTH CENTRAL 11740 12730 14740 11730. WAVES 5 TO 9 FEET  
OVERNIGHT THROUGH SUNDAY EVENING.  
 
SUPERIOR EAST 11740 19746 13730 13740 11730. WAVES 7 TO 10 FEET.  
 

 
 
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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