Marine Weather Forecast from Environment Canada

Winds


Issued 10:30 AM EDT 25 July 2017

Today Tonight and Wednesday. Strong wind warning in effect. Wind south 10 knots increasing to south 15 this afternoon and to south 20 near midnight. Wind veering to southwest 20 Wednesday morning then diminishing to west 15 Wednesday afternoon.

Extended Forecast


Issued 03:00 AM EDT 25 July 2017
Thursday Wind light becoming northwest 15 knots in the afternoon.
Friday Wind north 15 knots diminishing to light.
Saturday Wind light.

Waves


Issued 10:30 AM EDT 25 July 2017

Today Tonight and Wednesday. Waves one half metre building to one early this evening and to 2 late overnight. Waves subsiding to one Wednesday evening.

Weather & Visibility


Issued 10:30 AM EDT 25 July 2017

Today Tonight and Wednesday.Chance of showers beginning early this evening changing to showers late overnight and ending near noon Wednesday. Risk of thunderstorms tonight and Wednesday morning. Fog patches forming near midnight and dissipating Wednesday morning.

 

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



  
232  
FZUS63 KMQT 252009  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
409 PM EDT TUE JUL 25 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
 
HIGH PRESSURE OF 30.1 INCHES OVER THE EASTERN GREAT  
LAKES REGION WILL DRIFT TO NEW ENGLAND THROUGH WEDNESDAY MORNING. A  
TROUGH OF 29.8 INCHES WILL THEN MOVE ACROSS LAKE SUPERIOR LATE  
TONIGHT THROUGH WEDNESDAY AFTERNOON. A 30.0 INCH RIDGE WILL BUILD  
SOUTHEASTWARD ACROSS THE UPPER GREAT LAKES ON THURSDAY, THEN PERSIST  
THROUGH THE WEEKEND.  
 
LSZ162-260415-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
409 PM EDT TUE JUL 25 2017 /309 PM CDT TUE JUL 25 2017/  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 5 TO 15 KNOTS. ISOLATED  
SHOWERS AND THUNDERSTORMS. WAVES 1 TO 3 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT, THEN BECOMING WEST 10 TO 20 KNOTS LATE. SCATTERED  
SHOWERS AND ISOLATED THUNDERSTORMS. WAVES SUBSIDING TO CALM TO  
2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
WEDNESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTHWEST WINDS LESS THAN 10 KNOTS BECOMING  
WEST 5 TO 15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING EAST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. SCATTERED  
SHOWERS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ263-260415-  
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-  
409 PM EDT TUE JUL 25 2017  
   
LATE THIS AFTERNOON
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES 1 TO  
3 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS AFTER MIDNIGHT. SCATTERED SHOWERS AND ISOLATED  
THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET.    
WEDNESDAY
 
WEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS  
THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER  
MIDNIGHT, THEN DIMINISHING TO LESS THAN 10 KNOTS LATE. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS LESS THAN 10 KNOTS. WAVES CALM TO 2 FEET.   
THURSDAY NIGHT
 
WEST WINDS LESS THAN 10 KNOTS. WAVES CALM TO  
2 FEET.    
FRIDAY
 
WEST WINDS LESS THAN 10 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
EAST WINDS LESS THAN 10 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. SCATTERED  
SHOWERS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ264-260415-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
409 PM EDT TUE JUL 25 2017  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES 1 TO  
3 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT
 
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST LATE.  
SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. WAVES BUILDING TO  
3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTH  
LESS THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
WEST WINDS LESS THAN 10 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHWEST WINDS LESS THAN 10 KNOTS. WAVES CALM TO  
2 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ265-260415-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
409 PM EDT TUE JUL 25 2017  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES 1 TO  
3 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT, THEN BECOMING SOUTHWEST 10 TO 20 KNOTS  
LATE. SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO  
1 TO 3 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND A  
SLIGHT CHANCE OF THUNDERSTORMS THROUGH EARLY AFTERNOON. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTH LATE.  
WAVES CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ266-260415-  
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-  
409 PM EDT TUE JUL 25 2017  
   
LATE THIS AFTERNOON
 
SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES 2 TO  
4 FEET.    
TONIGHT
 
SOUTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE.  
SCATTERED SHOWERS AND THUNDERSTORMS. WAVES BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST IN THE  
AFTERNOON, THEN DIMINISHING TO 5 TO 15 KNOTS LATE. A CHANCE OF  
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS THROUGH EARLY  
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH LATE.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES CALM  
TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ267-260415-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
409 PM EDT TUE JUL 25 2017  
   
LATE THIS AFTERNOON
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET BUILDING TO 1 TO 3 FEET.    
TONIGHT
 
SOUTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS LATE. ISOLATED SHOWERS THROUGH MIDNIGHT, THEN NUMEROUS  
SHOWERS AND SCATTERED THUNDERSTORMS AFTER MIDNIGHT. WAVES  
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS LATE. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS  
THROUGH EARLY AFTERNOON, THEN A SLIGHT CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH LATE.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST  
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO  
CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ261-260415-  
MAFOR 2521/  
SUPERIOR WEST 11310 12410 11510 12610 12510. SCATTERED SHOWERS  
LATE THIS EVENING. WAVES 1 TO 4 FEET.  
 
SUPERIOR NORTH CENTRAL 11320 13420 11520 12620 11610. SCATTERED  
SHOWERS AFTER MIDNIGHT TONIGHT. WAVES 1 TO 5 FEET.  
 
SUPERIOR SOUTH CENTRAL 11320 13420 12520 12610. SCATTERED SHOWERS  
AND THUNDERSTORMS LATE TONIGHT. CHANCE OF SHOWERS WEDNESDAY  
MORNING. WAVES 1 TO 4 FEET.  
 
SUPERIOR EAST 11320 11420 11430 11436 11430 11536 11520 11610.  
SCATTERED SHOWERS AND THUNDERSTORMS LATE TONIGHT THROUGH MID  
WEDNESDAY MORNING. WAVES 1 TO 3 FEET BUILDING TO 3 TO 6 FEET  
TONIGHT AND WEDNESDAY.  
 

 
 
JSS  
 
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

HEAT INDEX
The heat index combines air temperature and dew point in an attempt to determine the human-perceived equivalent temperature - how hot it feels. The human body normally cools itself by sweating, which evaporates and carries heat away from the body. However, when the relative humidity is high the evaporation rate is reduced, so heat is removed from the body at a lower rate causing it to retain more heat than it would in dry air.