Marine Weather Forecast from Environment Canada

Winds


Issued 10:30 AM EDT 21 July 2018

Today Tonight and Sunday. Wind northeast 15 to 20 knots becoming northeast 15 late overnight then diminishing to north 10 Sunday evening.

Extended Forecast


Issued 03:00 AM EDT 21 July 2018
Monday Wind northeast 15 knots diminishing to light in the morning.
Tuesday Wind light becoming southwest 15 knots.
Wednesday Wind west 15 knots.

Waves


Issued 10:30 AM EDT 21 July 2018

Today Tonight and Sunday. Waves one half to one metre subsiding to one half metre early Sunday morning and to less than one half metre Sunday evening.

Weather & Visibility


Issued 10:30 AM EDT 21 July 2018

Today Tonight and Sunday.Chance of showers today and tonight with a risk of thunderstorms. Fog patches forming this evening and dissipating late overnight.

Ice Forecast*


Issued 12:00 PM EDT 6 July 2018

Today Tonight and Sunday At 10:30 a.m. EDT today low 1004 mb located over southern Lake
Michigan.
By 10:30 a.m. EDT Sunday low 1006 mb located over western Ohio.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over Manitoba.
By 10:30 a.m. EDT Sunday ridge located on a line north-south over
northwestern Ontario.

Great Lakes - Lake Superior Area

Another Region

 

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



  
264  
FZUS63 KMQT 211349  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
949 AM EDT SAT JUL 21 2018  
 
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 STILL CENTERED OVER FAR SOUTHERN LAKE  
MICHIGAN WILL SLOWLY PUSH SOUTHEAST AND REACH THE OHIO RIVER  
VALLEY LATE TONIGHT. LOOK FOR A 30.1 INCH RIDGE TO MOVE INTO THE  
UPPER GREAT LAKES SUNDAY EVENING, WEAKENING TO 30.0 INCHES THROUGH  
MONDAY AS A 29.9 INCH LOW GRADUALLY MOVES OVER NORTHERN ONTARIO  
INTO TUESDAY. MEANWHILE, 30.1 INCH RIDGING WILL MOVE ACROSS THE  
NORTHERN PLAINS INTO THE UPPER MISSISSIPPI VALLEY TUESDAY AND  
DIMINISH ON WEDNESDAY.  
 
LSZ162-212200-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
949 AM EDT SAT JUL 21 2018 /849 AM CDT SAT JUL 21 2018/  
   
REST OF TODAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON, THEN BACKING NORTHEAST LATE. PATCHY FOG BY LATE  
MORNING. ISOLATED SHOWERS AND THUNDERSTORMS BY MID AFTERNOON.  
WAVES CALM TO 2 FEET.    
TONIGHT
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST LATE.  
WAVES CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE  
AFTERNOON, THEN BACKING NORTHEAST LATE. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS LESS THAN 10 KNOTS BACKING  
NORTHWEST AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
SOUTHWEST WINDS LESS THAN 10 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS LESS THAN 10 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ263-212200-  
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-  
949 AM EDT SAT JUL 21 2018  
   
REST OF TODAY
 
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS IN THE AFTERNOON. WIDESPREAD FOG. WAVES 1 TO  
3 FEET.    
TONIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. ISOLATED SHOWERS. WAVES  
1 TO 3 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS LESS THAN 10 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
WEST WINDS LESS THAN 10 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS LESS THAN 10 KNOTS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ264-212200-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
949 AM EDT SAT JUL 21 2018  
   
REST OF TODAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH IN  
THE AFTERNOON. WIDESPREAD FOG BY LATE MORNING. ISOLATED SHOWERS.  
WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH LATE.  
SCATTERED SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING  
TO 2 TO 4 FEET.    
SUNDAY
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
MONDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST.  
WAVES CALM TO 2 FEET.  
 

 
 
LSZ265-212200-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
949 AM EDT SAT JUL 21 2018  
   
REST OF TODAY
 
NORTH WINDS 10 TO 20 KNOTS. PATCHY FOG BY LATE  
MORNING. SCATTERED SHOWERS. WAVES 1 TO 3 FEET BUILDING TO 2 TO  
4 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. SCATTERED SHOWERS. WAVES  
2 TO 4 FEET.    
SUNDAY
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
IN THE AFTERNOON. A SLIGHT CHANCE OF SHOWERS THROUGH EARLY  
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
MONDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM  
TO 2 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ266-212200-  
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-  
949 AM EDT SAT JUL 21 2018  
   
REST OF TODAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH IN  
THE AFTERNOON. WIDESPREAD FOG BY LATE MORNING. SCATTERED SHOWERS.  
ISOLATED THUNDERSTORMS BY MID AFTERNOON. WAVES 1 TO 3 FEET  
BUILDING TO 2 TO 4 FEET.    
TONIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH LATE.  
PATCHY FOG. ISOLATED THUNDERSTORMS THROUGH MIDNIGHT. SCATTERED  
SHOWERS. WAVES 2 TO 4 FEET.    
SUNDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST LATE.  
WAVES SUBSIDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
MONDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM  
TO 2 FEET.    
WEDNESDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ267-212200-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
949 AM EDT SAT JUL 21 2018  
   
REST OF TODAY
 
NORTHEAST WINDS 10 TO 20 KNOTS. WIDESPREAD FOG  
BY LATE MORNING. PATCHY FOG BY MID AFTERNOON. SCATTERED SHOWERS  
BY LATE MORNING. ISOLATED THUNDERSTORMS. PERIODS OF SHOWERS BY  
MID AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 2 TO 4 FEET.    
TONIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS. PATCHY FOG THROUGH  
MIDNIGHT, THEN WIDESPREAD FOG AFTER MIDNIGHT. NUMEROUS SHOWERS  
AND SCATTERED THUNDERSTORMS THROUGH MIDNIGHT, THEN ISOLATED  
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET, THEN  
BUILDING TO 2 TO 4 FEET.    
SUNDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH IN THE  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
MONDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
WEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES  
CALM TO 2 FEET.  
 

 
LSZ261-212200-  
MAFOR 2115/  
SUPERIOR WEST 11113 12110 11800 12810 12110. WAVES 1 TO 3 FEET.  
 
SUPERIOR NORTH CENTRAL 11123 11820 11810 11110 12120 11820 11810.  
SCATTERED SHOWERS TONIGHT. WAVES 2 TO 4 FEET.  
 
SUPERIOR SOUTH CENTRAL 14810 12110 12810. SCATTERED SHOWERS THIS  
AFTERNOON THROUGH THE OVERNIGHT. WAVES 2 TO 4 FEET.  
 
SUPERIOR EAST 11123 11120 13126 12123 11120. PATCHY FOG.  
SCATTERED SHOWERS LATE THIS MORNING, WITH ISOLATED THUNDER  
POSSIBLE LATE THIS AFTERNOON AND EVENING. SCATTERED SHOWERS AFTER  
MIDNIGHT TONIGHT. WAVES 2 TO 4 FEET.  
 

 
 
KCW  
 
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.