Marine Weather Forecast from Environment Canada

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

  
719   
FZUS63 KMQT 072002  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
401 PM EDT WED OCT 7 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  
  
29.7 INCH TROUGHING CONTINUES THROUGH THIS EVENING AS THE ASSOCIATED   
29.4 INCH LOW TRACKS EASTWARD ACROSS FAR NORTHERN ONTARIO OVER JAMES   
BAY. HIGH PRESSURE THEN BUILDS IN FROM THE CANADIAN PRAIRIES AND   
NORTHERN PLAINS LATE IN THE WORK WEEK, SHIFTING INTO THE OHIO RIVER   
VALLEY EARLY FRIDAY. THIS WILL RESULT IN 29.9 INCH RIDGING OVER LAKE   
SUPERIOR ON THURSDAY STRENGTHENING TO 30.1 INCHES ON FRIDAY. A 29.4   
INCH CLIPPER LOW THEN DEVELOPS OFF THE NORTHERN ROCKIES LATE FRIDAY,   
CREATING A TIGHT PRESSURE GRADIENT OVER THE GREAT LAKES AS THE HIGH   
PRESSURE CENTER REMAINS OVER THE NORTHEAST US THROUGH SATURDAY. 29.8   
INCH TROUGHING MOVES OVER THE LAKE SUNDAY MORNING AS TROUGHING   
EXTENDS EASTWARD FROM THE SOUTHWEST US. RIDGING RETURNS OVER THE   
LAKE TUESDAY MORNING AS HIGH PRESSURE BUILDS ONCE MORE OVER THE   
NORTHERN PLAINS.   
  
LSZ162-080800-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
401 PM EDT WED OCT 7 2026 /301 PM CDT WED OCT 7 2026/  
   
LATE THIS AFTERNOON  
WEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE  
OF SHOWERS. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.    
TONIGHT  
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
THURSDAY  
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS IN THE AFTERNOON, THEN DIMINISHING TO 10 TO 20 KNOTS  
LATE. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
FRIDAY  
SOUTH WINDS 5 TO 15 KNOTS BACKING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT  
EAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO  
3 FEET.    
SATURDAY  
SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH GALES  
TO 35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTHWEST GALES TO 35 KNOTS. WAVES BUILDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY  
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH. A CHANCE  
OF SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH. A CHANCE  
OF RAIN SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.   
  
  
  
LSZ263-080800-  
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-  
401 PM EDT WED OCT 7 2026  
   
LATE THIS AFTERNOON  
WEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE  
OF SHOWERS. WAVES 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 DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BECOMING WEST 15 TO 25 KNOTS LATE.  
WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
THURSDAY  
WEST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
THURSDAY NIGHT  
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY  
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO  
1 TO 3 FEET.    
SATURDAY  
SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH GALES  
TO 35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
SATURDAY NIGHT  
SOUTH GALES TO 40 KNOTS BECOMING SOUTHWEST  
GALES TO 35 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
SUNDAY  
SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING NORTH 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET,  
THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY  
NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 2 TO  
4 FEET.   
  
  
  
LSZ264-080800-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
401 PM EDT WED OCT 7 2026  
   
LATE THIS AFTERNOON  
WEST WINDS 15 TO 25 KNOTS. A CHANCE OF  
SHOWERS. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF  
SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS LATE. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO  
9 FEET, THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT, THEN BACKING WEST LATE. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
FRIDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
SATURDAY  
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTH 20 TO  
30 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SATURDAY NIGHT  
SOUTH GALES TO 40 KNOTS BECOMING SOUTHWEST  
GALES TO 35 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
SUNDAY  
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH. A CHANCE  
OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY  
NORTH WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN SHOWERS.  
WAVES SUBSIDING TO 2 TO 4 FEET.   
  
  
  
LSZ265-080800-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
401 PM EDT WED OCT 7 2026  
   
LATE THIS AFTERNOON  
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF  
SHOWERS. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. A SLIGHT  
CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING  
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY  
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 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN  
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY NIGHT  
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHEAST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO  
2 TO 4 FEET.    
SATURDAY  
SOUTHEAST WINDS 20 TO 30 KNOTS BECOMING SOUTH GALES  
TO 35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SATURDAY NIGHT  
SOUTH GALES TO 40 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY  
SOUTHWEST WINDS 20 TO 30 KNOTS VEERING NORTHWEST. A  
CHANCE OF SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING  
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY  
NORTH GALES TO 35 KNOTS. SHOWERS LIKELY. WAVES  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.   
  
  
  
LSZ266-080800-  
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-  
401 PM EDT WED OCT 7 2026  
   
LATE THIS AFTERNOON  
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF  
SHOWERS. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF  
THUNDERSTORMS THROUGH MIDNIGHT. A CHANCE OF SHOWERS. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY  
NORTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE  
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 20 TO 30 KNOTS IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS THROUGH EARLY AFTERNOON.  
WAVES BUILDING TO 5 TO 9 FEET OCCASIONALLY TO 11 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT, THEN BACKING WEST LATE. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
FRIDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHEAST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
SATURDAY  
SOUTHEAST WINDS 20 TO 30 KNOTS VEERING SOUTH BY MID  
AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
SATURDAY NIGHT  
SOUTH GALES TO 35 KNOTS. WAVES SUBSIDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SUNDAY  
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST. A CHANCE  
OF SHOWERS. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET.    
MONDAY  
NORTH GALES TO 35 KNOTS. A CHANCE OF RAIN SHOWERS.  
WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.   
  
  
  
LSZ267-080800-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
401 PM EDT WED OCT 7 2026  
   
LATE THIS AFTERNOON  
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF  
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE OF  
THUNDERSTORMS THROUGH MIDNIGHT. A CHANCE OF SHOWERS. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY  
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS. WAVES BUILDING TO 5 TO  
9 FEET OCCASIONALLY TO 11 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS THROUGH  
MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY  
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO 15 KNOTS  
BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST  
20 TO 30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY  
SOUTHEAST WINDS 20 TO 30 KNOTS VEERING SOUTH BY MID  
AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SATURDAY NIGHT  
SOUTH GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SUNDAY  
SOUTH WINDS 15 TO 25 KNOTS VEERING SOUTHWEST. A CHANCE  
OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 4 TO  
7 FEET OCCASIONALLY TO 9 FEET.    
MONDAY  
NORTH WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS. WAVES  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.   
  
  
  
LSZ261-080200-  
MAFOR 0721/  
SUPERIOR WEST 16620. WAVES 2 TO 4 FEET TONIGHT. WAVES 2 TO 4 FEET  
SUBSIDING TO 1 TO 3 FEET THURSDAY.   
  
SUPERIOR NORTH CENTRAL 11630 13730 14740. A CHANCE OF SHOWERS  
THIS EVENING. WAVES 3 TO 5 FEET TONIGHT. WAVES 4 TO 7 FEET  
THURSDAY.   
  
SUPERIOR SOUTH CENTRAL 11640 15740 11740. A CHANCE OF SHOWERS  
THIS EVENING. WAVES 3 TO 5 FEET TONIGHT. WAVES 5 TO 8 FEET  
THURSDAY.   
  
SUPERIOR EAST 11630 14730 13740. A CHANCE OF SHOWERS THIS  
EVENING. WAVES 3 TO 6 FEET TONIGHT. WAVES 5 TO 9 FEET THURSDAY.   
  
  
  
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