Marine Weather Forecast from Environment Canada

Winds


Issued 03:00 AM EDT 23 September 2021

Today Tonight and Friday. Strong wind warning in effect. Wind northeast 20 knots except northeast 10 near the west end early this morning. Wind diminishing to northeast 15 early this evening and to north 10 near midnight. Wind becoming light Friday morning then becoming southwest 10 near noon Friday. Wind increasing to southeast 15 Friday evening.

Extended Forecast


Issued 03:00 AM EDT 23 September 2021
Saturday Wind northwest 25 knots.
Sunday Wind west 20 knots veering to north 15.
Monday Wind north 15 knots.

Waves


Issued 03:00 AM EDT 23 September 2021

Today Tonight and Friday. Waves 1.5 metres subsiding to 0.5 to 1 this evening and to 0.5 or less overnight. Waves building to 0.5 to 1 Friday evening.

Weather & Visibility


Issued 03:00 AM EDT 23 September 2021

Today Tonight and Friday.Periods of rain this afternoon tonight and Friday morning. Showers Friday evening.

 

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



  
561  
FZUS63 KMQT 230744  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
344 AM EDT THU SEP 23 2021  
 
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 29.7 INCH LOW PRESSURE WILL LIFT NORTH FROM LOWER  
MICHIGAN ACROSS LAKE HURON AT 29.8 INCHES TONIGHT. THIS ADVANCING  
LOW WILL REPLACE A 30.1 INCH RIDGE OVER SUPERIOR TODAY WITH A 29.9  
INCH TROUGH. AS THIS LOW LIFTS NORTH TOWARDS JAMES BAY ON FRIDAY,  
A SECONDARY TROUGH WILL APPROACH WESTERN SUPERIOR FROM THE  
NORTHWEST AT 29.8 INCHES FRIDAY NIGHT. THIS TROUGH WILL LINGER  
OVER THE GREAT LAKES THROUGH THE WEEKEND AS 30.1 INCH HIGH  
PRESSURE REMAINS TO THE SOUTH OVER THE APPALACHIANS.  
 

 
 
LSZ162-231545-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
344 AM EDT THU SEP 23 2021 /244 AM CDT THU SEP 23 2021/  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN THE AFTERNOON,  
THEN BACKING SOUTHEAST LATE. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 15 TO  
25 KNOTS LATE. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO  
4 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS BACKING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS. WAVES 2 TO 4 FEET.    
SATURDAY
 
WEST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING NORTHEAST. WAVES  
CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ263-231545-  
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-  
344 AM EDT THU SEP 23 2021  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
WEST WINDS 5 TO 15 KNOTS BACKING EAST IN THE AFTERNOON.  
WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING WEST AFTER MIDNIGHT,  
THEN BACKING SOUTHWEST LATE. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST IN THE  
AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS LATE. A CHANCE OF  
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF  
SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
SATURDAY
 
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS. WAVES  
SUBSIDING TO 2 TO 4 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.   
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO 15 KNOTS.  
WAVES CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ264-231545-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
344 AM EDT THU SEP 23 2021  
   
EARLY THIS MORNING
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. WAVES  
BUILDING TO 1 TO 3 FEET.    
TONIGHT
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST LATE. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON, THEN VEERING WEST LATE. A CHANCE OF  
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS. SHOWERS LIKELY  
THROUGH MIDNIGHT, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES  
BUILDING TO 2 TO 4 FEET.    
SATURDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
SUNDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ265-231545-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
344 AM EDT THU SEP 23 2021  
   
EARLY THIS MORNING
 
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES 2 TO  
4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TODAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH IN THE  
AFTERNOON. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST LATE.  
WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST IN THE  
AFTERNOON, THEN BECOMING WEST 15 TO 25 KNOTS LATE. A CHANCE OF  
SHOWERS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS. SHOWERS LIKELY THROUGH  
MIDNIGHT, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES BUILDING  
TO 2 TO 4 FEET.    
SATURDAY
 
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF SHOWERS. WAVES  
2 TO 4 FEET.    
SATURDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 1 TO  
3 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ266-231545-  
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-  
344 AM EDT THU SEP 23 2021  
   
EARLY THIS MORNING
 
NORTHEAST WINDS 15 TO 25 KNOTS. WAVES 3 TO  
6 FEET OCCASIONALLY TO 8 FEET BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
TODAY
 
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TONIGHT
 
NORTHEAST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BECOMING NORTHWEST 5 TO 15 KNOTS  
LATE. A SLIGHT CHANCE OF SHOWERS THROUGH MIDNIGHT. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
WEST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS IN THE AFTERNOON, THEN VEERING WEST LATE. A CHANCE OF  
SHOWERS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET, THEN  
BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS. SHOWERS LIKELY THROUGH  
MIDNIGHT, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES BUILDING  
TO 2 TO 4 FEET.    
SATURDAY
 
WEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS. WAVES BUILDING TO  
3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF  
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.    
SUNDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ267-231545-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
344 AM EDT THU SEP 23 2021  
   
EARLY THIS MORNING
 
NORTHEAST WINDS 20 TO 30 KNOTS. WAVES 3 TO  
6 FEET OCCASIONALLY TO 8 FEET BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
TODAY
 
NORTHEAST WINDS 20 TO 30 KNOTS BACKING NORTH IN THE  
AFTERNOON, THEN VEERING NORTHEAST LATE. A CHANCE OF SHOWERS.  
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TONIGHT
 
NORTHEAST WINDS 15 TO 25 KNOTS BACKING NORTH AFTER  
MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS LATE. A CHANCE OF  
SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST IN THE  
AFTERNOON, THEN BACKING SOUTH LATE. A CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. SHOWERS. A SLIGHT CHANCE OF  
THUNDERSTORMS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
SATURDAY
 
WEST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS  
THROUGH EARLY AFTERNOON. SHOWERS LIKELY BY MID AFTERNOON. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
SATURDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO 2 TO 4 FEET.    
SUNDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ261-231545-  
MAFOR 2309/  
SUPERIOR WEST 11400 11500 11600 11400 12300 11400 11500. WAVES 1  
FOOT OR LESS.  
 
SUPERIOR NORTH CENTRAL 11200 13110 13810 11800. WAVES 2 FEET OR  
LESS.  
 
SUPERIOR SOUTH CENTRAL 13120 11820 11830 12820 11810. WAVES 2 TO  
5 FEET TODAY. WAVES 3 TO 5 FEET TONIGHT.  
 
SUPERIOR EAST 13140 11830 13130 11820. A CHANCE OF SHOWERS THIS  
EVENING. WAVES 3 TO 7 FEET TODAY. WAVES 2 TO 5 FEET TONIGHT.  
 

 
 
JAW  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MQT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 




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