Marine Weather Forecast from Environment Canada

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

  
820   
FZUS63 KMQT 161339  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
939 AM EDT SUN MAR 16 2025  
  
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 LOW PRESSURE AT 29.2 INCHES NEAR SAGINAW BAY THIS  
MORNING WILL MOVE TO WESTERN QUEBEC BY THIS EVENING. 30.0 INCH   
RIDGING PASSES OVER LAKE SUPERIOR TONIGHT WHILE 29.6 INCH LOW   
PRESSURE FORMS OVER THE DAKOTAS/MONTANA REGION. THIS LOW WILL   
REORGANIZE INTO A COLORADO LOW TUESDAY MORNING AT 29.4 INCHES WHICH  
WILL APPROACH THE LOWER GREAT LAKES LATE WEDNESDAY AT AROUND 29.3  
INCHES, EVENTUALLY TRACKING NORTHEASTWARD INTO SOUTHEAST ONTARIO   
BY THURSDAY MORNING.  
  
LSZ162-162145-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
939 AM EDT SUN MAR 16 2025 /839 AM CDT SUN MAR 16 2025/  
   
REST OF TODAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
10 TO 20 KNOTS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET  
SUBSIDING TO 1 TO 3 FEET.    
TONIGHT  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH AFTER MIDNIGHT,  
THEN BACKING SOUTHEAST LATE. A SLIGHT CHANCE OF SNOW SHOWERS  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY  
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST IN THE  
AFTERNOON, THEN BECOMING NORTHEAST 15 TO 25 KNOTS LATE. A SLIGHT  
CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE  
OF SNOW SHOWERS. WAVES 1 TO 3 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 15 TO  
25 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH  
AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES 2 TO 4 FEET.    
WEDNESDAY  
NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ263-162145-  
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-  
939 AM EDT SUN MAR 16 2025  
   
REST OF TODAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
15 TO 25 KNOTS LATE. FREEZING SPRAY BY LATE MORNING. A SLIGHT  
CHANCE OF FREEZING RAIN BY LATE MORNING. WAVES 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET SUBSIDING TO 2 TO 4 FEET.    
TONIGHT  
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST AFTER  
MIDNIGHT, THEN BACKING SOUTH LATE. WAVES SUBSIDING TO CALM TO  
2 FEET.    
MONDAY  
SOUTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON, THEN BACKING EAST LATE. A CHANCE OF  
SNOW SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST AFTER  
MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS THROUGH MIDNIGHT. WAVES  
2 TO 4 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST BY MID  
AFTERNOON. WAVES 2 TO 4 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY  
NORTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET.    
THURSDAY  
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST 10 TO  
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.   
  
  
  
LSZ264-162145-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
939 AM EDT SUN MAR 16 2025  
   
REST OF TODAY  
NORTH WINDS TO 30 KNOTS WITH A FEW GALE FORCE  
GUSTS TO 35 KNOTS POSSIBLE BACKING NORTHWEST IN THE AFTERNOON,  
THEN DIMINISHING TO 20 TO 30 KNOTS LATE. A SLIGHT CHANCE OF  
FREEZING RAIN AND SNOW SHOWERS BY LATE MORNING. FREEZING SPRAY.  
WAVES 7 TO 10 FEET OCCASIONALLY TO 13 FEET SUBSIDING TO 4 TO  
7 FEET OCCASIONALLY TO 9 FEET.    
TONIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT, THEN BACKING SOUTH LATE. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
MONDAY  
SOUTH WINDS 15 TO 25 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 4 TO  
7 FEET OCCASIONALLY TO 9 FEET.    
MONDAY NIGHT  
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW  
SHOWERS, POSSIBLY MIXED WITH RAIN THROUGH MIDNIGHT. WAVES  
SUBSIDING TO 2 TO 4 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS.  
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY  
NORTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 8 TO  
12 FEET OCCASIONALLY TO 15 FEET.    
THURSDAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. FREEZING SPRAY. WAVES SUBSIDING TO 1 TO 3 FEET.   
  
  
  
LSZ265-162145-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
939 AM EDT SUN MAR 16 2025  
   
..GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING  
  
   
REST OF TODAY  
NORTH GALES TO 40 KNOTS BECOMING NORTHWEST GALES  
TO 35 KNOTS IN THE AFTERNOON, THEN DIMINISHING TO 20 TO 30 KNOTS  
LATE. FREEZING SPRAY. ISOLATED SNOW SHOWERS. WAVES 7 TO 11 FEET  
OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET.    
TONIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BACKING SOUTH LATE. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
MONDAY  
SOUTH WINDS 15 TO 25 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS. WAVES BUILDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY NIGHT  
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST  
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS  
THROUGH MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT. RAIN AND SNOW SHOWERS LIKELY  
THROUGH MIDNIGHT, THEN A CHANCE OF RAIN AND SNOW SHOWERS AFTER  
MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
WEDNESDAY  
NORTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS. SNOW SHOWERS LIKELY, THEN A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.    
THURSDAY  
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ266-162145-  
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-  
939 AM EDT SUN MAR 16 2025  
   
..GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING  
  
   
REST OF TODAY  
NORTHWEST GALES TO 40 KNOTS. FREEZING SPRAY.   
ISOLATED SNOW SHOWERS. WAVES 10 TO 14 FEET OCCASIONALLY TO 18   
FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BACKING SOUTH LATE. WAVES SUBSIDING  
TO 2 TO 4 FEET.    
MONDAY  
SOUTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS  
IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO  
1 TO 3 FEET, THEN BUILDING TO 5 TO 8 FEET OCCASIONALLY TO  
10 FEET.    
MONDAY NIGHT  
SOUTH WINDS 15 TO 25 KNOTS BECOMING EAST 10 TO  
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS  
THROUGH MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS,  
POSSIBLY MIXED WITH RAIN. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY NIGHT  
EAST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO  
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY  
NORTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
40 KNOTS. RAIN AND SNOW SHOWERS LIKELY, THEN A CHANCE OF SNOW  
SHOWERS. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.   
THURSDAY  
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. FREEZING SPRAY. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.   
  
  
  
LSZ267-162145-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
939 AM EDT SUN MAR 16 2025  
   
..GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING  
  
   
REST OF TODAY  
NORTHWEST GALES TO 40 KNOTS. FREEZING SPRAY.  
SCATTERED SNOW SHOWERS. WAVES 9 TO 12 FEET OCCASIONALLY TO  
15 FEET BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.    
TONIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BACKING SOUTH LATE. FREEZING SPRAY  
THROUGH MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.    
MONDAY  
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 20 TO 30 KNOTS  
IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO  
1 TO 3 FEET, THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.   
MONDAY NIGHT  
SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SNOW SHOWERS, POSSIBLY  
MIXED WITH RAIN THROUGH MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.   
TUESDAY  
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
TUESDAY NIGHT  
EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST  
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH  
MIDNIGHT. A CHANCE OF SNOW SHOWERS. RAIN SHOWERS LIKELY AFTER  
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY  
NORTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS. RAIN SHOWERS, THEN SNOW SHOWERS LIKELY. FREEZING SPRAY.  
WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.    
THURSDAY  
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. FREEZING SPRAY. A CHANCE OF SNOW SHOWERS. WAVES  
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
  
  
LSZ261-162145-  
MAFOR 1615/  
SUPERIOR WEST 12730 11720 11620 11600 11400 11310 11320. WAVES 3  
TO 5 FEET SUBSIDING TO 2 TO 4 FEET THIS AFTERNOON. WAVES 2 TO 4  
FEET SUBSIDING TO 1 FOOT OR LESS TONIGHT. WAVES 1 TO 3 FEET  
MONDAY MORNING.   
  
SUPERIOR NORTH CENTRAL 11840 19850 11741 19751 11740 11730 11710   
11600 11410 11430. WAVES 6 TO 10 FEET THIS AFTERNOON. WAVES 5 TO 8  
FEET SUBSIDING TO 1 TO 3 FEET TONIGHT. WAVES 1 TO 2 FEET BUILDING  
TO 2 TO 4 FEET MONDAY MORNING.   
  
SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...13751 11740  
11720 11600 11410 11430. WAVES 9 TO 13 FEET THIS AFTERNOON. WAVES  
8 TO 11 FEET SUBSIDING TO 2 TO 4 FEET TONIGHT. WAVES 1 TO 3 FEET  
BUILDING TO 2 TO 4 FEET MONDAY MORNING.   
  
SUPERIOR EAST...GALE WARNING IN EFFECT...13751 11741 11730 11720  
11510 11430. WAVES 10 TO 13 FEET THIS AFTERNOON. WAVES 10 TO 13  
FEET SUBSIDING TO 3 TO 5 FEET TONIGHT. WAVES 2 TO 4 FEET MONDAY  
MORNING.   
  
  
  
07  
  
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MQT/GLFTABLE  
  
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES