Marine Weather Forecast from Environment Canada
WindsIssued 03:00 AM EDT 19 May 2025 |
Today Tonight and Tuesday. Strong wind warning in effect. Wind northeast 15 knots increasing to northeast 20 early this morning then diminishing to northeast 15 near noon. Wind increasing to northeast 20 this evening then diminishing to northeast 15 near noon Tuesday. Wind increasing to northeast 20 Tuesday evening. |
Extended Forecast
Issued 06:30 PM EDT 18 May 2025
Tuesday
Wind northeast 20 knots.
Wednesday
Wind northeast 20 knots.
Thursday
Wind north 15 knots.
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WavesIssued 03:00 AM EDT 19 May 2025 |
Today Tonight and Tuesday. Waves 1 to 1.5 metres. |
Lake Superior Mafor Forecast and Weather Conditions
From NOAA National Weather Service Weather Forecast Office
 
904  
FZUS63 KMQT 190201  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1001 PM EDT SUN MAY 18 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 30.4 INCH HIGH PRESSURE OVER HUDSON BAY BUILDS TO  
30.6 INCHES BY MID MORNING ON MONDAY, INCREASING RIDGING OVER LAKE  
SUPERIOR TO 30.3 INCHES. RIDGING OVER THE LAKE WEAKENS TO 30.2  
INCHES MONDAY EVENING. A 29.4 INCH LOW OVER THE MID-MISSISSIPPI  
VALLEY ON TUESDAY PUSHES EASTWARD THROUGH THE DAY AND INTO THE OHIO  
VALLEY/LOWER GREAT LAKES BY WEDNESDAY MORNING; THIS IN TURN  
DECREASES RIDGING OVER LAKE SUPERIOR TO 30.1 INCHES BY TUESDAY  
NIGHT. THIS LOW THEN MAY EXTEND A 30.0 INCH TROUGH OVER THE LAKE ON  
THURSDAY BEFORE IT SHIFTS OFF INTO THE ATLANTIC. BY FRIDAY, THE NOW  
30.5 INCH HIGH PRESSURE OVER HUDSON BAY BRINGS 30.2 INCH RIDGING  
BACK OVER LAKE SUPERIOR.  
 
LSZ162-190800-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1001 PM EDT SUN MAY 18 2025 /901 PM CDT SUN MAY 18 2025/  
 
...GALE WARNING IN EFFECT FROM MONDAY AFTERNOON THROUGH MONDAY  
EVENING...  
   
REST OF TONIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES 1 TO  
3 FEET.    
MONDAY  
EAST WINDS 15 TO 25 KNOTS INCREASING TO GALES TO  
35 KNOTS IN THE AFTERNOON, THEN BACKING NORTHEAST LATE. WAVES  
BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.    
MONDAY NIGHT  
EAST GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 4 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
TUESDAY  
EAST GALES TO 35 KNOTS BECOMING NORTHEAST GALES TO  
40 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO  
18 FEET.    
TUESDAY NIGHT  
NORTHEAST GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS. WAVES  
SUBSIDING TO 4 TO 8 FEET OCCASIONALLY TO 10 FEET.    
WEDNESDAY  
NORTHEAST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
THURSDAY  
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES  
CALM TO 2 FEET.    
FRIDAY  
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 
 
 
LSZ263-190800-  
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 PM EDT SUN MAY 18 2025  
   
REST OF TONIGHT  
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST  
AFTER MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES  
1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO  
3 FEET.    
MONDAY  
EAST WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 20 TO  
30 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
MONDAY NIGHT  
EAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET, THEN  
BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
TUESDAY  
EAST WINDS 20 TO 30 KNOTS BECOMING NORTHEAST GALES TO  
35 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO  
13 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 20 TO 30 KNOTS. A SLIGHT CHANCE  
OF RAIN SHOWERS. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET, THEN BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.    
WEDNESDAY  
NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
THURSDAY  
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO  
3 FEET.    
FRIDAY  
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.  
 
 
 
LSZ264-190800-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1001 PM EDT SUN MAY 18 2025  
   
REST OF TONIGHT  
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHEAST  
10 TO 20 KNOTS LATE. WAVES CALM TO 2 FEET BUILDING TO 1 TO  
3 FEET.    
MONDAY  
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET,  
THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TUESDAY  
EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID  
AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET,  
THEN SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING  
TO 2 TO 4 FEET, THEN BUILDING TO 4 TO 7 FEET OCCASIONALLY TO  
9 FEET.    
WEDNESDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
THURSDAY  
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY  
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.  
 
 
 
LSZ265-190800-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1001 PM EDT SUN MAY 18 2025  
   
REST OF TONIGHT  
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST  
LATE. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.    
MONDAY  
NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET,  
THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TUESDAY  
EAST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING TO 2 TO  
4 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
WEDNESDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH BY MID  
AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
THURSDAY  
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY  
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST. WAVES  
CALM TO 2 FEET.  
 
 
 
LSZ266-190800-  
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 PM EDT SUN MAY 18 2025  
   
REST OF TONIGHT  
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT, THEN VEERING NORTHEAST LATE. WAVES 2 TO  
4 FEET SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.    
MONDAY  
NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS IN THE AFTERNOON, THEN BACKING NORTH LATE. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO  
1 TO 3 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET,  
THEN BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TUESDAY  
EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID  
AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING  
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH BY MID  
AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 15 TO 25 KNOTS. WAVES 2 TO 4 FEET.   
THURSDAY  
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES 2 TO 4 FEET.    
FRIDAY  
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.  
 
 
 
LSZ267-190800-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1001 PM EDT SUN MAY 18 2025  
   
REST OF TONIGHT  
NORTH WINDS 15 TO 25 KNOTS VEERING NORTHEAST  
LATE. A SLIGHT CHANCE OF RAIN SHOWERS BY MIDNIGHT. WAVES 1 TO  
3 FEET BUILDING TO 2 TO 4 FEET.    
MONDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO  
20 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT  
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO  
15 TO 25 KNOTS AFTER MIDNIGHT, THEN VEERING EAST LATE. WAVES  
BUILDING TO 2 TO 4 FEET.    
TUESDAY  
EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST BY MID  
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY NIGHT  
NORTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY  
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH BY MID  
AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY NIGHT  
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES 2 TO 4 FEET.    
THURSDAY  
NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN SHOWERS.  
WAVES 2 TO 4 FEET.    
FRIDAY  
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.  
 
 
 
LSZ261-190800-  
MAFOR 1903/  
SUPERIOR WEST...GALE WARNING IN EFFECT...12110 11120 11230 11240  
12140 11240. WAVES 1 TO 2 FEET OVERNIGHT. WAVES 1 TO 3 FEET  
BUILDING TO 5 TO 8 FEET MONDAY. WAVES 5 TO 8 FEET MONDAY EVENING.  
 
SUPERIOR NORTH CENTRAL 11810 14120 11120 11110 11120. WAVES 1 TO  
2 FEET OVERNIGHT. WAVES 2 TO 4 FEET MONDAY. WAVES 1 TO 2 FEET  
MONDAY EVENING.  
 
SUPERIOR SOUTH CENTRAL 12810 13120 13110. WAVES 2 TO 3 FEET  
OVERNIGHT. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET MONDAY.  
WAVES 2 TO 3 FEET MONDAY EVENING.  
 
SUPERIOR EAST 11820 14120 12810 11120. WAVES 2 TO 3 FEET  
OVERNIGHT. WAVES 3 TO 5 FEET SUBSIDING TO 1 TO 3 FEET MONDAY.  
WAVES 1 TO 3 FEET MONDAY EVENING.  
 
 
 
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