Marine Weather Forecast from Environment Canada

Lake Superior Mafor Forecast and Weather Conditions
From NOAA National Weather Service Weather Forecast Office

  
102   
FZUS63 KMQT 141401  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1001 AM EDT MON SEP 14 2026  
  
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  
  
30.2 INCH RIDGING OVER THE UPPER GREAT LAKES REMAINS THROUGH THE   
REMAINDER OF THE MORNING HOURS. A LOW AROUND 29.3 INCHES SKIRTS BY   
LAKE WINNIPEG INTO NORTHERN ONTARIO MONDAY NIGHT INTO EARLY TUESDAY,   
BRINGING 29.7 INCH TROUGHING OVER LAKE SUPERIOR. 30.2 INCH HIGH   
PRESSURE DEVELOPS OVER THE NORTHERN PLAINS ON TUESDAY, STRENGTHENING   
TO 30.4 INCHES AS IT CROSSES THE UPPER GREAT LAKES ON WEDNESDAY.   
HIGH PRESSURE RIDGING OF 30.2 TO 30.3 INCHES THEN LOOKS TO REMAIN   
OVER LAKE SUPERIOR THROUGH THE REST OF THE WORKWEEK.   
  
LSZ162-142000-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1001 AM EDT MON SEP 14 2026 /901 AM CDT MON SEP 14 2026/  
  
...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY  
AFTERNOON...  
   
REST OF TODAY  
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN  
THE AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS LATE. SHOWERS  
AND A SLIGHT CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES CALM  
TO 2 FEET.    
TONIGHT  
SOUTH GALES TO 35 KNOTS VEERING SOUTHWEST LATE.  
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS THROUGH MIDNIGHT,  
THEN A SLIGHT CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO  
4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
TUESDAY  
WEST GALES TO 40 KNOTS DIMINISHING TO 20 TO 30 KNOTS  
LATE. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET,  
THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY NIGHT  
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY  
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT  
EAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST.  
WAVES CALM TO 2 FEET.    
FRIDAY  
EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO  
20 KNOTS. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ263-142000-  
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-  
1001 AM EDT MON SEP 14 2026  
  
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY  
EVENING...  
   
REST OF TODAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON, THEN BECOMING SOUTHEAST 15 TO 25 KNOTS  
LATE. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS BY  
MID AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET.    
TONIGHT  
SOUTH GALES TO 35 KNOTS VEERING SOUTHWEST LATE.  
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS THROUGH MIDNIGHT,  
THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO  
7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
TUESDAY  
SOUTHWEST GALES TO 45 KNOTS VEERING WEST IN THE  
AFTERNOON. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO  
18 FEET, THEN SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.    
TUESDAY NIGHT  
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY  
NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT  
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHEAST.  
WAVES CALM TO 2 FEET.    
FRIDAY  
SOUTH WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO 20 KNOTS.  
A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ264-142000-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1001 AM EDT MON SEP 14 2026  
  
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY  
EVENING...  
   
REST OF TODAY  
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST  
20 TO 30 KNOTS LATE. WAVES CALM TO 2 FEET BUILDING TO 2 TO  
4 FEET.    
TONIGHT  
SOUTH GALES TO 35 KNOTS. SHOWERS THROUGH MIDNIGHT,  
THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
TUESDAY  
SOUTHWEST GALES TO 45 KNOTS VEERING WEST IN THE  
AFTERNOON. WAVES BUILDING TO 11 TO 15 FEET OCCASIONALLY TO  
19 FEET, THEN SUBSIDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.    
TUESDAY NIGHT  
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY  
NORTH WINDS LESS THAN 10 KNOTS BECOMING SOUTH 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT  
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES CALM TO  
2 FEET.    
FRIDAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS.  
A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ265-142000-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1001 AM EDT MON SEP 14 2026  
  
...GALE WARNING IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
TUESDAY EVENING...  
   
REST OF TODAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST  
10 TO 20 KNOTS IN THE AFTERNOON, THEN INCREASING TO 20 TO  
30 KNOTS LATE. WAVES CALM TO 2 FEET BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
TONIGHT  
SOUTH GALES TO 40 KNOTS. SHOWERS AND A SLIGHT CHANCE  
OF THUNDERSTORMS THROUGH MIDNIGHT, THEN A CHANCE OF SHOWERS AFTER  
MIDNIGHT. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET,  
THEN SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
TUESDAY  
SOUTHWEST GALES TO 40 KNOTS BECOMING WEST GALES TO  
45 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET, THEN BUILDING TO 6 TO 9 FEET OCCASIONALLY  
TO 11 FEET.    
TUESDAY NIGHT  
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.   
WEDNESDAY  
NORTHWEST WINDS 5 TO 15 KNOTS VEERING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT  
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING  
SOUTHWEST 5 TO 15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
WEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES CALM  
TO 2 FEET.    
FRIDAY  
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES  
CALM TO 2 FEET.   
  
  
  
LSZ266-142000-  
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-  
1001 AM EDT MON SEP 14 2026  
  
...GALE WARNING IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
TUESDAY EVENING...  
   
REST OF TODAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN  
THE AFTERNOON, THEN BECOMING SOUTHEAST 20 TO 30 KNOTS LATE. WAVES  
CALM TO 2 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT  
SOUTH GALES TO 40 KNOTS. SHOWERS THROUGH MIDNIGHT. A  
SLIGHT CHANCE OF THUNDERSTORMS. A CHANCE OF SHOWERS AFTER  
MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.   
TUESDAY  
SOUTHWEST GALES TO 40 KNOTS VEERING WEST IN THE  
AFTERNOON. WAVES SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO  
11 FEET, THEN BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.    
TUESDAY NIGHT  
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY  
NORTH WINDS 5 TO 15 KNOTS VEERING EAST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT  
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING  
SOUTHWEST AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES  
CALM TO 2 FEET.    
FRIDAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS.  
A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ267-142000-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1001 AM EDT MON SEP 14 2026  
  
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY  
MORNING...  
   
REST OF TODAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN  
THE AFTERNOON, THEN BECOMING SOUTHEAST 10 TO 20 KNOTS LATE. WAVES  
CALM TO 2 FEET.    
TONIGHT  
SOUTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
40 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT,  
THEN SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS AFTER MIDNIGHT.  
WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.    
TUESDAY  
SOUTH GALES TO 35 KNOTS BECOMING SOUTHWEST 20 TO  
30 KNOTS IN THE AFTERNOON, THEN BECOMING WEST GALES TO 35 KNOTS  
LATE. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON. WAVES  
SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN BUILDING TO  
7 TO 10 FEET OCCASIONALLY TO 13 FEET.    
TUESDAY NIGHT  
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY  
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT  
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY  
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. A CHANCE  
OF SHOWERS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ261-142000-  
MAFOR 1415/  
SUPERIOR WEST...GALE WARNING IN EFFECT...11410 11310 12336 11446  
11540 11550 11560. WAVES 1 FOOT OR LESS THIS AFTERNOON. WAVES 1  
TO 3 FEET BUILDING TO 3 TO 6 FEET TONIGHT. WAVES 4 TO 7 FEET  
BUILDING TO 7 TO 10 FEET TUESDAY MORNING.   
  
SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11410 11420  
11340 11356 11456 12450 11550. WAVES 2 FEET OR LESS THIS  
AFTERNOON. WAVES 3 TO 5 FEET BUILDING TO 6 TO 10 FEET TONIGHT.  
WAVES 5 TO 9 FEET TUESDAY MORNING.   
  
SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11410 11330  
11340 12456 12450 11550. WAVES 1 FOOT OR LESS BUILDING TO 1 TO 3  
FEET THIS AFTERNOON. WAVES 3 TO 5 FEET BUILDING TO 6 TO 9 FEET  
TONIGHT. WAVES 6 TO 9 FEET SUBSIDING TO 4 TO 7 FEET TUESDAY  
MORNING.   
  
SUPERIOR EAST...GALE WARNING IN EFFECT...11500 11400 11320 11340  
11446 11456 12450. WAVES 1 TO 2 FEET THIS AFTERNOON. WAVES 1 TO 3  
FEET BUILDING TO 5 TO 9 FEET TONIGHT. WAVES 7 TO 10 FEET TUESDAY  
MORNING.   
  
  
  
WFO MQT  
  
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MQT/GLFTABLE  
  
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES