Marine Weather Forecast from Environment Canada

Winds


Issued 03:00 AM EDT 22 August 2019

Today Tonight and Friday. Wind northwest 15 knots diminishing to north 10 early this morning then increasing to northwest 15 this afternoon. Wind diminishing to light overnight. Wind light Friday.

Extended Forecast


Issued 03:00 AM EDT 22 August 2019
Saturday Wind light becoming southeast 15 knots in the afternoon.
Sunday Wind southeast 15 knots.
Monday Wind south 20 knots.

Waves


Issued 03:00 AM EDT 22 August 2019

Today Tonight and Friday. Waves one metre subsiding to one half metre or less early this morning then building to one early this evening. Waves subsiding to less than one half metre Friday morning.

Ice Forecast*


Issued 12:00 PM EDT 19 May 2019

Today Tonight and Friday At 10:30 a.m. EDT today departing low 996 mb located over eastern
Quebec.

At 10:30 a.m. EDT today departing cold front from low located on
a line northeast-southwest over the St. Lawrence River.

At 10:30 a.m. EDT today ridge located on a line north-south over
Lake of the Woods.
By 10:30 a.m. EDT Friday ridge located on a line north-south over
Lake Superior.

Great Lakes - Lake Superior Area

Another Region

 
720  
FZUS63 KMQT 221348  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
948 AM EDT THU AUG 22 2019  
 
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
 
HIGH PRESSURE OF 30.1 INCHES CONTINUES TO SLOWLY BUILD  
SOUTHEASTWARD TOWARDS THE LAKE TODAY. TONIGHT INTO FRIDAY, THE  
MAIN AXIS OF HIGH PRESSURE WILL SLIDE SOUTH OVER THE REGION, AND  
REMAIN ANCHORED OVERHEAD THROUGH SATURDAY AS IT BUILDS TO 30.3  
INCHES. BY SUNDAY, RIDGING WILL SHIFT EAST OVER QUEBEC. LOW  
PRESSURE OF 29.6 INCHES WILL THEN DEVELOP OVER THE DAKOTAS LATE  
SUNDAY. THE LOW WILL STRENGTHEN MONDAY EVENING TO 29.3 INCHES,  
WHILE LIFTING NORTH INTO ONTARIO, AND SWINGING A 29.4 INCH THROUGH  
THROUGH THE UPPER GREAT LAKES. THROUGH THE MIDDLE PART OF NEXT  
WEEK, THIS SURFACE LOW WILL REMAIN PARKED ACROSS NORTHERN ONTARIO,  
WHILE STRENGTHENING TO 29.1 INCHES.  
 
LSZ162-222200-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
948 AM EDT THU AUG 22 2019 /848 AM CDT THU AUG 22 2019/  
   
REST OF TODAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN  
THE AFTERNOON. SPRINKLES BY LATE MORNING. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN  
10 KNOTS LATE. WAVES CALM TO 2 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS  
LATE. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES  
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
MONDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING WEST. SHOWERS  
LIKELY. A CHANCE OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ263-222200-  
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-  
948 AM EDT THU AUG 22 2019  
   
REST OF TODAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER  
MIDNIGHT, THEN VEERING NORTHEAST LATE. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.    
MONDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING WEST. SHOWERS  
LIKELY, THEN A CHANCE OF SHOWERS. WAVES SUBSIDING TO CALM TO  
2 FEET, THEN BUILDING TO 2 TO 4 FEET.  
 

 
 
LSZ264-222200-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
948 AM EDT THU AUG 22 2019  
   
REST OF TODAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST IN  
THE AFTERNOON, THEN BACKING NORTH LATE. WAVES CALM TO 2 FEET.    
TONIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST LATE.  
WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS. SHOWERS LIKELY, THEN A CHANCE OF SHOWERS. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO  
2 TO 4 FEET.  
 

 
 
LSZ265-222200-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
948 AM EDT THU AUG 22 2019  
   
REST OF TODAY
 
NORTH WINDS 10 TO 20 KNOTS. SPRINKLES BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON, THEN DIMINISHING TO 5 TO 15 KNOTS  
LATE. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO  
25 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.    
MONDAY
 
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. SHOWERS LIKELY, THEN A CHANCE OF SHOWERS. WAVES  
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM TO 2 FEET.  
 

 
 
LSZ266-222200-  
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-  
948 AM EDT THU AUG 22 2019  
   
REST OF TODAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
TONIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO  
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. WAVES  
CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST  
LESS THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS, THEN  
SHOWERS LIKELY. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET, THEN SUBSIDING TO 2 TO 4 FEET.  
 

 
 
LSZ267-222200-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
948 AM EDT THU AUG 22 2019  
   
REST OF TODAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST IN  
THE AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS LATE. WAVES CALM  
TO 2 FEET BUILDING TO 1 TO 3 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.    
FRIDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO  
15 KNOTS IN THE AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS  
LATE. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS, THEN  
SHOWERS LIKELY. WAVES SUBSIDING TO 2 TO 4 FEET.  
 

 
LSZ261-222200-  
MAFOR 2215/  
SUPERIOR WEST 11110 12210 11200 13100 11110. WAVES 2 FEET OR  
LESS.  
 
SUPERIOR NORTH CENTRAL 11810 12800 11700 11810 13110. WAVES 1 TO  
2 FEET.  
 
SUPERIOR SOUTH CENTRAL 14810 13800 11110. WAVES 2 FEET OR LESS.  
 
SUPERIOR EAST 11810 11710 11720 12810 11800 11100 11110. WAVES 1  
TO 3 FEET.  
 

 
 
JP  
 
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

Did you know?
The technique for measuring wind chill was developed by scientists in Antarctica during the Second World War. They measured how long it took to freeze vials of water exposed to different wind conditions in temperatures below 0ºC. Then they developed formulas for relating heat loss to wind speed and air temperature.