Marine Weather Forecast from Environment Canada

Winds


Issued 05:22 PM EDT 22 September 2017

Today Tonight and Saturday. Wind southeast 15 knots veering to south 15 near midnight then diminishing to south 10 near noon Saturday. Wind becoming variable 10 Saturday evening.

Extended Forecast


Issued 03:00 AM EDT 22 September 2017
Sunday Wind south 15 knots diminishing to light in the morning.
Monday Wind light becoming east 15 knots.
Tuesday Wind south 20 knots.

Waves


Issued 10:30 AM EDT 22 September 2017

Today Tonight and Saturday. Waves one metre subsiding to less than one half metre Saturday evening.

Weather & Visibility


Issued 05:22 PM EDT 22 September 2017

Today Tonight and Saturday.A few showers ending early this evening with a risk of thunderstorms. Chance of showers overnight and Saturday morning with a risk of thunderstorms. A few showers beginning Saturday evening with a risk of thunderstorms. Fog patches.

 

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



  
471  
FZUS63 KMQT 222015  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
415 PM EDT FRI SEP 22 2017  
 
FOR WATERS BEYOND FIVE 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
 
LAKE SUPERIOR WILL REMAIN SITUATED BETWEEN A 30.1  
INCH RIDGE ACROSS THE OHIO VALLEY AND A 29.6 INCH TROUGH OVER THE  
UPPER MISSISSIPPI VALLEY THROUGH SATURDAY. THE TROUGH WILL STALL  
JUST WEST OF LAKE SUPERIOR SUNDAY AND MONDAY AND WEAKEN TO 29.9  
INCHES. ON TUESDAY, THE TROUGH WILL PUSH EASTWARD ACROSS LAKE  
SUPERIOR. A 30.0 INCH RIDGE WILL BUILD IN WEDNESDAY.  
 
LSZ162-230415-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
415 PM EDT FRI SEP 22 2017 /315 PM CDT FRI SEP 22 2017/  
   
LATE THIS AFTERNOON
 
NORTHEAST WINDS 5 TO 15 KNOTS. WIDESPREAD  
FOG. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST LATE.  
PATCHY FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER  
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM  
TO 2 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST LATE.  
PATCHY FOG THROUGH EARLY AFTERNOON. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS VEERING EAST LATE. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING  
TO CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
AREAS OF FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS  
BY MID AFTERNOON. AREAS OF FOG. A CHANCE OF SHOWERS. WAVES CALM  
TO 2 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING WEST AFTER  
MIDNIGHT. SHOWERS LIKELY. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ263-230415-  
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-  
415 PM EDT FRI SEP 22 2017  
   
LATE THIS AFTERNOON
 
NORTH WINDS 5 TO 15 KNOTS. WIDESPREAD FOG.  
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER MIDNIGHT.  
PATCHY FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER  
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM  
TO 2 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST LATE.  
PATCHY FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST  
AFTER MIDNIGHT, THEN VEERING EAST LATE. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. AREAS OF FOG. WAVES  
CALM TO 2 FEET.    
MONDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING EAST BY MID  
AFTERNOON. AREAS OF FOG. A CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER  
MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO 25 KNOTS.  
A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY  
TO 7 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ264-230415-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
415 PM EDT FRI SEP 22 2017  
   
LATE THIS AFTERNOON
 
NORTH WINDS 5 TO 15 KNOTS. WIDESPREAD FOG.  
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE.  
WIDESPREAD FOG THROUGH MIDNIGHT, THEN PATCHY FOG AFTER MIDNIGHT.  
A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.  
WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST LATE.  
PATCHY FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
1 TO 3 FEET.    
SATURDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER  
MIDNIGHT, THEN VEERING NORTHEAST LATE. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST BY MID  
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. A CHANCE OF  
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. AREAS OF FOG. WAVES  
CALM TO 2 FEET.    
MONDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING EAST BY MID  
AFTERNOON. AREAS OF FOG. A CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
MONDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER  
MIDNIGHT. A CHANCE OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET,  
THEN SUBSIDING TO CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO 25 KNOTS.  
A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY  
TO 8 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ265-230415-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
415 PM EDT FRI SEP 22 2017  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 10 TO 20 KNOTS. PATCHY  
FOG. ISOLATED SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE.  
PATCHY FOG. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO  
15 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS  
THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.   
MONDAY
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.  
 

 
 
LSZ266-230415-  
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-  
415 PM EDT FRI SEP 22 2017  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 10 TO 20 KNOTS. PATCHY  
FOG. ISOLATED SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS LATE. WIDESPREAD FOG THROUGH MIDNIGHT. PATCHY FOG AFTER  
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
SATURDAY
 
SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS LATE. PATCHY FOG. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO  
2 FEET.    
SATURDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH  
LATE. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO  
1 TO 3 FEET.    
MONDAY
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.  
 

 
 
LSZ267-230415-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
415 PM EDT FRI SEP 22 2017  
   
LATE THIS AFTERNOON
 
WEST WINDS 15 TO 25 KNOTS. PATCHY FOG.  
SCATTERED SHOWERS AND THUNDERSTORMS. WAVES 2 TO 4 FEET SUBSIDING  
TO 1 TO 3 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS LATE. PATCHY FOG. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS  
LATE. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO  
2 FEET.    
SATURDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.   
MONDAY
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 15 TO  
25 KNOTS. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.  
 

 
 
LSZ261-230415-  
MAFOR 2221/  
SUPERIOR WEST 11113 12210 11410 13510 11500. PATCHY FOG TONIGHT.  
WAVES 1 TO 3 FEET.  
 
SUPERIOR NORTH CENTRAL 11103 11213 11323 11320 11410 13510. WAVES  
1 TO 3 FEET.  
 
SUPERIOR SOUTH CENTRAL 11320 13310 14410. PATCHY FOG THROUGH  
TONIGHT. SCATTERED SHOWERS AND THUNDERSTORMS EARLY THIS EVENING.  
WAVES 1 TO 3 FEET.  
 
SUPERIOR EAST 11430 12310 14410 11410. SCATTERED SHOWERS AND  
THUNDERSTORMS EARLY THIS EVENING. PATCHY FOG THROUGH EARLY  
SATURDAY AFTERNOON. WAVES 1 TO 3 FEET.  
 

 
 
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  
 




Random Weather Facts

OZONE
Ozone is a chemical in our atmosphere with a dual nature: at high altitudes it benefits us by blocking harmful UV radiation; at ground level it is a harmful pollutant. Ozone is not emitted directly, but forms from reactions between other air pollutants in the presence of sunlight. This ground-level ozone can irritate the lungs causing difficulty breathing, especially for people with asthma or other lung diseases. At high concentrations, ozone can damage rubber, plastics and paint, as well as vegetation.