Marine Weather Forecast from Environment Canada

Winds


Issued 03:00 AM EDT 05 July 2020

Today Tonight and Monday. Wind light becoming southeast 10 knots overnight then becoming light Monday evening.

Extended Forecast


Issued 03:00 AM EDT 05 July 2020
Tuesday Wind west 15 knots diminishing to light in the afternoon.
Wednesday Wind light becoming southeast 15 knots late in the day.
Thursday Wind southeast 15 knots.

Waves


Issued 03:00 AM EDT 05 July 2020

Today Tonight and Monday. Waves less than one half metre building to one half metre Monday morning then subsiding to less than one half metre Monday evening.

Weather & Visibility


Issued 03:00 AM EDT 05 July 2020

Today Tonight and Monday.Showers today and this evening. Risk of thunderstorms today and early this evening. Risk of thunderstorms Monday afternoon and evening. Fog patches dissipating this morning.

Ice Forecast*


Issued 12:00 PM EDT 17 May 2020

Today Tonight and Monday Forecasts available to mariners upon request.

*Ice Forecast and Warnings also apply to U.S. waters

 

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



  
935  
FZUS63 KMQT 050751  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
351 AM EDT SUN JUL 5 2020  
 
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 30.0 INCH HIGH PRESSURE RIDGE WILL PERSIST OVER THE  
UPPER GREAT LAKES AND UPPER MISSISSIPPI VALLEY TODAY. A 29.8 INCH  
TROUGH WILL MOVE THROUGH NORTHERN ONTARIO MONDAY AFTERNOON,  
CLIPPING THE NORTHERN SHORE OF LAKE SUPERIOR MONDAY EVENING INTO  
TUESDAY MORNING. ON WEDNESDAY, A 29.5 INCH LOW PRESSURE WILL MOVE  
NORTHEAST ACROSS THE NORTHERN PLAINS INTO MANITOBA. THIS LOW WILL  
BRING A 29.8 INCH TROUGH ACROSS LAKE SUPERIOR THURSDAY.  
 
LSZ162-051600-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
351 AM EDT SUN JUL 5 2020 /251 AM CDT SUN JUL 5 2020/  
   
EARLY THIS MORNING
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING EAST IN THE AFTERNOON,  
THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES CALM TO 2 FEET.    
TONIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS LATE. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM  
TO 2 FEET.    
MONDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS  
THAN 10 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. A  
CHANCE OF SHOWERS. A CHANCE OF THUNDERSTORMS. SHOWERS LIKELY.  
WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.  
 

 
 
LSZ263-051600-  
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-  
351 AM EDT SUN JUL 5 2020  
   
EARLY THIS MORNING
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TODAY
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER  
MIDNIGHT, THEN VEERING SOUTH LATE. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS LATE. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM  
TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH  
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. A CHANCE OF SHOWERS. A CHANCE OF THUNDERSTORMS. SHOWERS  
LIKELY. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.  
 

 
 
LSZ264-051600-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
351 AM EDT SUN JUL 5 2020  
   
EARLY THIS MORNING
 
SOUTHEAST WINDS LESS THAN 10 KNOTS. PATCHY  
DENSE FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
TODAY
 
EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO  
15 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS THROUGH EARLY AFTERNOON. PATCHY DENSE FOG. WAVES  
CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.  
WAVES CALM TO 2 FEET.    
MONDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST IN THE  
AFTERNOON, THEN BACKING SOUTH LATE. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.  
 

 
 
LSZ265-051600-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
351 AM EDT SUN JUL 5 2020  
   
EARLY THIS MORNING
 
SOUTHEAST WINDS 5 TO 15 KNOTS. PATCHY DENSE  
FOG. WAVES CALM TO 2 FEET.    
TODAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON. PATCHY DENSE FOG THROUGH EARLY AFTERNOON. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE. A SLIGHT  
CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO  
2 FEET.    
MONDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN THE  
AFTERNOON, THEN BECOMING SOUTHEAST 10 TO 20 KNOTS LATE. A CHANCE  
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.  
 

 
 
LSZ266-051600-  
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-  
351 AM EDT SUN JUL 5 2020  
   
EARLY THIS MORNING
 
SOUTHEAST WINDS 5 TO 15 KNOTS. PATCHY DENSE  
FOG. WAVES CALM TO 2 FEET.    
TODAY
 
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS THROUGH EARLY AFTERNOON. PATCHY DENSE FOG. WAVES  
CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE. A SLIGHT  
CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO  
2 FEET.    
MONDAY
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST  
LESS THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES BUILDING  
TO 1 TO 3 FEET.    
THURSDAY
 
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO  
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING  
TO CALM TO 2 FEET.  
 

 
 
LSZ267-051600-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
351 AM EDT SUN JUL 5 2020  
   
EARLY THIS MORNING
 
EAST WINDS 5 TO 15 KNOTS. PATCHY DENSE FOG.  
WAVES CALM TO 2 FEET.    
TODAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST IN THE  
AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. PATCHY DENSE  
FOG. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN VEERING SOUTH LATE. WAVES CALM TO  
2 FEET.    
MONDAY
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS BACKING EAST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. A CHANCE OF SHOWERS. A CHANCE OF THUNDERSTORMS. WAVES  
BUILDING TO 1 TO 3 FEET.    
THURSDAY
 
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO  
15 KNOTS. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING  
TO CALM TO 2 FEET.  
 

 
 
LSZ261-051600-  
MAFOR 0509/  
SUPERIOR WEST 11500 11400 11300 12200 13100. A CHANCE OF SHOWERS  
AND THUNDERSTORMS OVERNIGHT. WAVES 1 FOOT OR LESS.  
 
SUPERIOR NORTH CENTRAL 11300 19304 11200 19204 13200 13300. WAVES  
1 FOOT OR LESS.  
 
SUPERIOR SOUTH CENTRAL 11300 19304 11100 19104 11100 13200 12300.  
WAVES 1 FOOT OR LESS.  
 
SUPERIOR EAST 12200 19204 12200 11100 11200 12300. WAVES 1 FOOT  
OR LESS.  
 

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




Random Weather Facts

Weather Terms
Dew Point - A measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming pressure and moisture content are constant).