Marine Weather Forecast from Environment Canada

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

  
036   
FZUS63 KMQT 011402  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1002 AM EDT THU OCT 1 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  
  
TROUGHING OF AROUND 29.8 INCHES LINGERS OVER EASTERN LAKE SUPERIOR   
THIS MORNING BETWEEN A 29.1 INCH HUDSON BAY LOW AND ANOTHER 29.7   
INCH LOW OVER THE SOUTH PLAINS. HIGH PRESSURE BUILDS TO 30.2 INCHES   
OVER THE NORTHERN PLAINS TONIGHT INTO FRIDAY BEFORE SHIFTING EAST TO   
THE GREAT LAKES FRIDAY NIGHT AND SATURDAY AND BUILDING TO 30.3   
INCHES. A WEAK 29.9 INCH TROUGH CROSSES LAKE SUPERIOR SATURDAY NIGHT   
AND SUNDAY, WITH 30.3 INCH HIGH PRESSURE QUICKLY RETURNING SUNDAY   
NIGHT INTO MONDAY. RIDGING REMAINS IN THE AREA THROUGH TUESDAY   
AFTERNOON BEFORE BEING REPLACED BY TROUGHING WEDNESDAY MORNING.  
  
LSZ162-012000-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1002 AM EDT THU OCT 1 2026 /902 AM CDT THU OCT 1 2026/  
   
REST OF TODAY  
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 1 TO  
3 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
FRIDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS IN THE AFTERNOON, THEN DIMINISHING TO 5 TO 15 KNOTS  
LATE. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 15 TO  
25 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
SATURDAY NIGHT  
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST  
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY  
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY  
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.   
  
  
  
LSZ263-012000-  
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-  
1002 AM EDT THU OCT 1 2026  
   
REST OF TODAY  
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST  
10 TO 20 KNOTS IN THE AFTERNOON, THEN INCREASING TO 15 TO  
25 KNOTS LATE. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
FRIDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS LATE. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF  
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT  
SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST 20 TO  
30 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES BUILDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.    
MONDAY  
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 15 TO  
25 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO  
2 TO 4 FEET.   
  
  
  
LSZ264-012000-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1002 AM EDT THU OCT 1 2026  
   
REST OF TODAY  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST  
15 TO 25 KNOTS IN THE AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO  
2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO  
2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
FRIDAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS LATE. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTH WINDS 15 TO 25 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SUNDAY  
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET,  
THEN SUBSIDING TO 2 TO 4 FEET.    
MONDAY  
NORTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES  
SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ265-012000-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1002 AM EDT THU OCT 1 2026  
   
REST OF TODAY  
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST TO  
30 KNOTS WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE.  
WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,  
THEN SUBSIDING TO 2 TO 4 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
FRIDAY  
NORTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE GUSTS  
TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS LATE. WAVES  
BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET, THEN SUBSIDING  
TO 2 TO 4 FEET.    
FRIDAY NIGHT  
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST  
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
SUNDAY  
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET,  
THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ266-012000-  
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-  
1002 AM EDT THU OCT 1 2026  
   
REST OF TODAY  
NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS IN THE AFTERNOON. AREAS OF DENSE FOG BY LATE  
MORNING. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY  
TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
FRIDAY  
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
FRIDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 20 TO  
30 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT, THEN  
SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
SUNDAY  
NORTHWEST GALES TO 45 KNOTS. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
MONDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ267-012000-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1002 AM EDT THU OCT 1 2026  
   
REST OF TODAY  
WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST IN  
THE AFTERNOON, THEN INCREASING TO 20 TO 30 KNOTS LATE. AREAS OF  
DENSE FOG BY LATE MORNING. WAVES 1 TO 3 FEET BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
FRIDAY  
NORTHWEST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF  
SHOWERS THROUGH EARLY AFTERNOON. WAVES BUILDING TO 6 TO 10 FEET  
OCCASIONALLY TO 13 FEET.    
FRIDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT  
SOUTH WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST  
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH  
MIDNIGHT, THEN SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO  
4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
SUNDAY  
WEST GALES TO 40 KNOTS BECOMING NORTHWEST 20 TO  
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 9 TO 12 FEET  
OCCASIONALLY TO 15 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
MONDAY  
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ261-012000-  
MAFOR 0115/  
SUPERIOR WEST 13620 13720 11730 11720. WAVES 1 TO 3 FEET THIS  
AFTERNOON AND TONIGHT. WAVES 2 TO 4 FEET FRIDAY MORNING.   
  
SUPERIOR NORTH CENTRAL 11730 11630 11640 13730 12740. WAVES 2 TO  
4 FEET THIS AFTERNOON AND TONIGHT. WAVES 3 TO 6 FEET FRIDAY  
MORNING.   
  
SUPERIOR SOUTH CENTRAL 12740 11640 11740 11730 13740. WAVES 2 TO  
4 FEET BUILDING TO 3 TO 5 FEET THIS AFTERNOON. WAVES 3 TO 5 FEET  
TONIGHT. WAVES 4 TO 7 FEET FRIDAY MORNING.   
  
SUPERIOR EAST 11724 13730 12720 12730. WAVES 2 TO 4 FEET BUILDING  
TO 3 TO 5 FEET THIS AFTERNOON. WAVES 3 TO 5 FEET SUBSIDING TO 2  
TO 4 FEET TONIGHT. WAVES 3 TO 6 FEET FRIDAY 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