Marine Weather Forecast from Environment Canada

Winds


Issued 03:00 AM EDT 28 October 2020

Today Tonight and Thursday. Strong wind warning in effect. Wind southwest 25 knots veering to west 25 early this morning then diminishing to northwest 15 this afternoon. Wind increasing to north 20 near midnight then diminishing to northeast 15 near noon Thursday. Wind diminishing to northeast 10 Thursday evening.

Extended Forecast


Issued 03:00 AM EDT 28 October 2020
Friday Wind northeast 15 knots diminishing to light in the morning then becoming southwest 15 late in the day.
Saturday Wind southwest 35 knots diminishing to southwest 30 late in the day.
Sunday Wind northwest 35 knots diminishing to northwest 30 late in the day.

Waves


Issued 03:00 AM EDT 28 October 2020

Today Tonight and Thursday. Waves 3 metres subsiding to 2 this morning and to one early this evening. Waves building to one and one half metres overnight then subsiding to one Thursday afternoon.

Weather & Visibility


Issued 03:00 AM EDT 28 October 2020

Today Tonight and Thursday.Showers or flurries ending this evening.

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



  
042  
FZUS63 KMQT 281409  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1009 AM EDT WED OCT 28 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 29.4 INCH LOW MOVING THROUGH HUDSON BAY IS  
EXTENDING A 29.8 INCH TROUGH ACROSS THE NORTHERN PORTION OF LAKE  
SUPERIOR THROUGH LATE THIS EVENING. TONIGHT, 30.2 INCH HIGH  
PRESSURE WILL BE BUILDING INTO NORTHERN ONTARIO. IT WILL THEN  
DRIFT SOUTHEASTWARD ACROSS LAKE SUPERIOR FROM THURSDAY TO FRIDAY.  
ON SATURDAY, A 29.4 INCH LOW IS EXPECTED TO MOVE THROUGH NORTHERN  
ONTARIO, DRAGGING A 29.6 INCH TROUGH ACROSS LAKE SUPERIOR SATURDAY  
NIGHT. SUNDAY WILL SEE A 30.6 INCH HIGH PRESSURE MOVE SOUTHEAST  
ACROSS THE CENTRAL PLAINS. THIS WILL BRING A RIDGE OF AT LEAST  
30.1 INCHES OVER LAKE SUPERIOR SUNDAY.  
 
LSZ162-282215-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1009 AM EDT WED OCT 28 2020 /909 AM CDT WED OCT 28 2020/  
   
REST OF TODAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST  
LATE. RAIN SHOWERS LIKELY BY LATE MORNING, THEN A CHANCE OF RAIN  
SHOWERS BY MID AFTERNOON. WAVES 4 TO 7 FEET OCCASIONALLY TO  
9 FEET SUBSIDING TO 1 TO 3 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 1 TO  
3 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO  
15 KNOTS IN THE AFTERNOON, THEN BECOMING NORTH LESS THAN 10 KNOTS  
LATE. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
FRIDAY
 
WEST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SATURDAY
 
SOUTH WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO  
40 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET.    
SUNDAY
 
NORTHWEST GALES TO 40 KNOTS BECOMING WEST 15 TO  
25 KNOTS. WAVES SUBSIDING TO 2 TO 4 FEET.  
 

 
 
LSZ263-282215-  
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-  
1009 AM EDT WED OCT 28 2020  
   
REST OF TODAY
 
WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST  
LATE. A CHANCE OF RAIN SHOWERS. WAVES 6 TO 9 FEET OCCASIONALLY TO  
11 FEET SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF RAIN  
SHOWERS. A SLIGHT CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF RAIN AND SNOW  
SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO CALM TO  
2 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SATURDAY
 
SOUTH WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO  
45 KNOTS. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.    
SUNDAY
 
NORTHWEST GALES TO 45 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 2 TO  
4 FEET, THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.  
 

 
 
LSZ264-282215-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1009 AM EDT WED OCT 28 2020  
   
REST OF TODAY
 
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST  
15 TO 25 KNOTS LATE. A CHANCE OF RAIN SHOWERS. WAVES 7 TO 10 FEET  
OCCASIONALLY TO 13 FEET SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW  
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN  
10 KNOTS LATE. A SLIGHT CHANCE OF SNOW SHOWERS THROUGH EARLY  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS LESS THAN 10 KNOTS BACKING  
NORTHWEST AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.    
SATURDAY
 
SOUTH GALES TO 35 KNOTS BECOMING WEST GALES TO  
45 KNOTS. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.    
SUNDAY
 
NORTHWEST GALES TO 45 KNOTS. A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET, THEN  
SUBSIDING TO 2 TO 4 FEET.  
 

 
 
LSZ265-282215-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1009 AM EDT WED OCT 28 2020  
   
REST OF TODAY
 
WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS IN THE AFTERNOON, THEN VEERING NORTHWEST LATE. A CHANCE  
OF RAIN SHOWERS BY LATE MORNING, THEN RAIN SHOWERS LIKELY BY MID  
AFTERNOON. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET SUBSIDING TO  
2 TO 4 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. A CHANCE OF SNOW SHOWERS,  
POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO  
15 KNOTS IN THE AFTERNOON, THEN BACKING NORTH LATE. A SLIGHT  
CHANCE OF RAIN AND SNOW SHOWERS THROUGH EARLY AFTERNOON. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SATURDAY
 
SOUTH GALES TO 35 KNOTS VEERING WEST. A CHANCE OF  
RAIN SHOWERS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET, THEN BUILDING TO 7 TO 10 FEET  
OCCASIONALLY TO 13 FEET.    
SUNDAY
 
NORTHWEST GALES TO 45 KNOTS. SNOW SHOWERS LIKELY. WAVES  
BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET, THEN SUBSIDING  
TO 2 TO 4 FEET.  
 

 
 
LSZ266-282215-  
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-  
1009 AM EDT WED OCT 28 2020  
   
REST OF TODAY
 
WEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS IN THE AFTERNOON, THEN VEERING NORTHWEST LATE. A CHANCE  
OF RAIN SHOWERS. WAVES 7 TO 10 FEET OCCASIONALLY TO 13 FEET  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TONIGHT
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS LATE. A SLIGHT CHANCE OF RAIN SHOWERS. A SLIGHT CHANCE  
OF SNOW SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST IN THE  
AFTERNOON, THEN BECOMING NORTH 5 TO 15 KNOTS LATE. A SLIGHT  
CHANCE OF SNOW SHOWERS THROUGH EARLY AFTERNOON. WAVES SUBSIDING  
TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
FRIDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
SATURDAY
 
SOUTH GALES TO 40 KNOTS BECOMING WEST GALES TO  
35 KNOTS. A CHANCE OF RAIN SHOWERS. A CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET, THEN  
SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.    
SUNDAY
 
NORTHWEST GALES TO 45 KNOTS. SNOW SHOWERS LIKELY. WAVES  
BUILDING TO 12 TO 17 FEET OCCASIONALLY TO 21 FEET, THEN SUBSIDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.  
 

 
 
LSZ267-282215-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1009 AM EDT WED OCT 28 2020  
   
REST OF TODAY
 
WEST WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN  
SHOWERS BY LATE MORNING, THEN RAIN SHOWERS LIKELY BY MID  
AFTERNOON. WAVES 4 TO 8 FEET OCCASIONALLY TO 10 FEET.    
TONIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH AFTER  
MIDNIGHT. A CHANCE OF RAIN SHOWERS. A SLIGHT CHANCE OF SNOW  
SHOWERS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.    
THURSDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON, THEN BECOMING NORTH 10 TO 20 KNOTS  
LATE. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO 20 KNOTS  
BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SATURDAY
 
SOUTH GALES TO 40 KNOTS BECOMING WEST GALES TO  
35 KNOTS. A CHANCE OF RAIN SHOWERS, THEN RAIN SHOWERS LIKELY,  
POSSIBLY MIXED WITH SNOW SHOWERS. WAVES BUILDING TO 8 TO 11 FEET  
OCCASIONALLY TO 14 FEET.    
SUNDAY
 
NORTH GALES TO 45 KNOTS BECOMING NORTHWEST GALES TO  
40 KNOTS. SNOW SHOWERS, POSSIBLY MIXED WITH RAIN, THEN A CHANCE  
OF SNOW SHOWERS, POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO  
12 TO 17 FEET OCCASIONALLY TO 21 FEET, THEN SUBSIDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.  
 

 
LSZ261-282215-  
MAFOR 2815/  
SUPERIOR WEST 11636 11630 11720 12820 13810. WAVES 4 TO 7 FEET  
SUBSIDING TO 3 TO 5 FEET THIS AFTERNOON. WAVES 1 TO 4 FEET  
TONIGHT AND THURSDAY MORNING.  
 
SUPERIOR NORTH CENTRAL 11640 12730 13820 12810. A CHANCE OF RAIN  
SHOWERS THIS AFTERNOON. WAVES 7 TO 10 FEET SUBSIDING TO 5 TO 8  
FEET THIS AFTERNOON. WAVES 3 TO 6 FEET TONIGHT. WAVES 2 TO 4 FEET  
THURSDAY MORNING.  
 
SUPERIOR SOUTH CENTRAL 11640 11636 11736 11720 13820 11810. A  
CHANCE OF SNOW SHOWERS OVERNIGHT. WAVES 4 TO 7 FEET SUBSIDING TO  
3 TO 6 FEET THIS AFTERNOON. WAVES 3 TO 5 FEET TONIGHT AND  
THURSDAY MORNING.  
 
SUPERIOR EAST 11640 11636 11736 11720 12820 12810. WAVES 6 TO 9  
FEET THIS AFTERNOON. WAVES 4 TO 7 FEET SUBSIDING TO 3 TO 5 FEET  
TONIGHT. WAVES 2 TO 4 FEET THURSDAY MORNING.  
 

 
 
JH  
 
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

CONDENSATION
Condensation is the physical process by which vapour becomes liquid or solid; the opposite of evaporation.