Marine Weather Forecast from Environment Canada

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



  
822  
FZUS63 KMQT 220258  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
958 PM EST TUE NOV 21 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
 
A 30.5 INCH HIGH OVER THE CENTRAL PLAINS WILL EXTEND  
NORTHEASTWARD OVERNIGHT AND WEAKEN TO 30.2 INCHES AS IT PASSES  
THROUGH THE OHIO RIVER VALLEY LATE WEDNESDAY. EARLY THURSDAY  
MORNING, A 29.9 INCH TROUGH IN EASTERN MANITOBA WILL QUICKLY SWING  
SOUTH ACROSS THE UPPER GREAT LAKES ONLY TO BE REPLACED BY A 30.0  
INCH RIDGE LATE THURSDAY NIGHT. FRIDAY MORNING, A 29.0 INCH LOW  
WILL TRACK EAST ACROSS CENTRAL AND EASTERN MANITOBA REACHING  
NORTHERN ONTARIO BY FRIDAY EVENING. A 30.2 INCH RIDGE WILL THEN  
MOVE INTO THE NORTHERN PLAINS ON SATURDAY, REACHING THE CENTRAL  
MISSISSIPPI RIVER VALLEY BY SUNDAY.  
 
LSZ162-221100-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
958 PM EST TUE NOV 21 2017 /858 PM CST TUE NOV 21 2017/  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST  
10 TO 20 KNOTS LATE. ISOLATED SNOW SHOWERS. WAVES 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET SUBSIDING TO 1 TO 3 FEET.   
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO  
25 KNOTS. SCATTERED SNOW SHOWERS IN THE AFTERNOON. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY  
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES 3 TO 5 FEET SUBSIDING  
TO 2 TO 4 FEET.    
THURSDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN  
SHOWERS IN THE MORNING, THEN RAIN SHOWERS LIKELY IN THE  
AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
FRIDAY NIGHT
 
WEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF  
SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
SATURDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO  
2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.  
 

 
 
LSZ263-221100-  
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-  
958 PM EST TUE NOV 21 2017  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AND BACKING WEST LATE. ISOLATED SNOW SHOWERS.  
WAVES 5 TO 8 FEET OCCASIONALLY TO 10 FEET SUBSIDING TO 2 TO 4  
FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO  
25 KNOTS BY MID AFTERNOON. ISOLATED SNOW SHOWERS. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY  
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
THURSDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30  
KNOTS. RAIN SHOWERS LIKELY IN THE AFTERNOON. WAVES BUILDING TO 4  
TO 7 FEET OCCASIONALLY TO 9 FEET.    
FRIDAY NIGHT
 
WEST GALES TO 35 KNOTS. A CHANCE OF RAIN SHOWERS.  
A CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET.    
SATURDAY
 
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO  
3 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.  
 

 
 
LSZ264-221100-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
958 PM EST TUE NOV 21 2017  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
10 TO 20 KNOTS AND BACKING WEST LATE. ISOLATED SNOW SHOWERS.  
WAVES 6 TO 9 FEET OCCASIONALLY TO 11 FEET SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AND BACKING SOUTHWEST BY MID AFTERNOON. ISOLATED SNOW  
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5  
FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST BY  
MIDNIGHT. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 4 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
THURSDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS IN THE  
MORNING. WAVES SUBSIDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS. RAIN SHOWERS LIKELY IN  
THE AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO  
9 FEET.    
FRIDAY NIGHT
 
WEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A CHANCE OF  
SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 9 TO 12 FEET  
OCCASIONALLY TO 15 FEET.    
SATURDAY
 
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 15 TO  
25 KNOTS LATE. A CHANCE OF SNOW SHOWERS. WAVES BUILDING TO 10 TO  
14 FEET OCCASIONALLY TO 18 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
SUNDAY
 
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. A CHANCE  
OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING  
TO 2 TO 4 FEET.  
 

 
 
LSZ265-221100-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
958 PM EST TUE NOV 21 2017  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST 15  
TO 25 KNOTS LATE. SCATTERED SNOW SHOWERS. WAVES 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7  
FEET.    
WEDNESDAY
 
WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. ISOLATED SNOW SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.   
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST  
20 TO 30 KNOTS BY MIDNIGHT. A SLIGHT CHANCE OF SNOW SHOWERS.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY
 
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS IN THE  
MORNING. WAVES SUBSIDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET,  
THEN BUILDING TO 1 TO 3 FEET.    
FRIDAY
 
SOUTHWEST WINDS 20 TO 30 KNOTS. A CHANCE OF RAIN  
SHOWERS IN THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT
 
WEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS LATE.  
WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.    
SATURDAY
 
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. SNOW SHOWERS. WAVES BUILDING TO 9 TO 12 FEET  
OCCASIONALLY TO 15 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
SUNDAY
 
WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST. A CHANCE  
OF SNOW SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING  
TO 1 TO 3 FEET.  
 

 
 
LSZ266-221100-  
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-  
958 PM EST TUE NOV 21 2017  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
15 TO 25 KNOTS LATE. SCATTERED SNOW SHOWERS. WAVES 9 TO 12 FEET  
OCCASIONALLY TO 15 FEET SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9  
FEET.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST BY  
MID AFTERNOON. SCATTERED SNOW SHOWERS. WAVES SUBSIDING TO 2 TO  
4 FEET, THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS BY MIDNIGHT, THEN VEERING WEST LATE. A CHANCE OF  
SNOW SHOWERS. WAVES BUILDING TO 4 TO 8 FEET OCCASIONALLY TO  
10 FEET.    
THURSDAY
 
WEST WINDS 20 TO 30 KNOTS BECOMING NORTHWEST 15 TO  
25 KNOTS IN THE AFTERNOON. A CHANCE OF SNOW SHOWERS, POSSIBLY  
MIXED WITH RAIN IN THE MORNING. WAVES BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
THURSDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH  
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS  
LATE. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4  
FEET.   
FRIDAY
 
SOUTH WINDS 20 TO 30 KNOTS. RAIN SHOWERS LIKELY IN THE  
AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET,  
THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
FRIDAY NIGHT
 
WEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS AFTER MIDNIGHT. RAIN AND SNOW SHOWERS LIKELY. WAVES  
BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET.    
SATURDAY
 
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. SNOW SHOWERS LIKELY. WAVES BUILDING TO 12 TO 17 FEET  
OCCASIONALLY TO 21 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SUNDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST. SNOW  
SHOWERS LIKELY. WAVES SUBSIDING TO 1 TO 3 FEET.  
 

 
 
LSZ267-221100-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
958 PM EST TUE NOV 21 2017  
   
REST OF TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
15 TO 25 KNOTS LATE. NUMEROUS SNOW SHOWERS. WAVES 8 TO 11 FEET  
OCCASIONALLY TO 14 FEET SUBSIDING TO 4 TO 7 FEET OCCASIONALLY TO 9  
FEET.    
WEDNESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. SCATTERED SNOW SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 15 TO 25 KNOTS INCREASING TO  
20 TO 30 KNOTS BY MIDNIGHT, THEN VEERING WEST LATE. A CHANCE OF  
SNOW SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO  
8 FEET.    
THURSDAY
 
WEST WINDS 20 TO 30 KNOTS VEERING NORTHWEST IN THE  
AFTERNOON. A CHANCE OF SNOW SHOWERS, POSSIBLY MIXED WITH RAIN.  
WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET, THEN  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO  
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN AND SNOW SHOWERS LATE. WAVES  
SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
SOUTH GALES TO 35 KNOTS VEERING SOUTHWEST LATE. RAIN  
SHOWERS LIKELY. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9  
FEET.    
FRIDAY NIGHT
 
SOUTHWEST GALES TO 35 KNOTS VEERING WEST AFTER  
MIDNIGHT. RAIN AND SNOW SHOWERS. WAVES BUILDING TO 10 TO 14 FEET  
OCCASIONALLY TO 18 FEET.    
SATURDAY
 
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. SNOW SHOWERS LIKELY. WAVES BUILDING TO 12 TO 17 FEET  
OCCASIONALLY TO 21 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SUNDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS. A CHANCE OF SNOW SHOWERS. WAVES SUBSIDING TO 1 TO  
3 FEET.  
 

 
LSZ261-221100-  
MAFOR 2204/  
SUPERIOR WEST 11740 11720 13620 13530. CHANCE OF SNOW SHOWERS  
WEDNESDAY EVENING. WAVES 3 TO 7 FEET.  
 
SUPERIOR NORTH CENTRAL 11740 11730 11720 12620 11630 12530.  
CHANCE OF SNOW SHOWERS WEDNESDAY EVENING. WAVES 4 TO 8 FEET.  
 
SUPERIOR SOUTH CENTRAL 11740 11730 11720 11620 11630 11530 12520.  
SCATTERED SNOW SHOWERS. WAVES 6 TO 9 FEET SUBSIDING TO 4 TO 7  
FEET OVERNIGHT, AND THEN SUBSIDING TO 1 TO 3 FEET WEDNESDAY  
EVENING.  
 
SUPERIOR EAST 11740 11730 12720 12620 12530. SCATTERED SNOW  
SHOWERS. WAVES 6 TO 10 FEET SUBSIDING TO 5 TO 8 FEET OVERNIGHT,  
THEN SUBSIDING TO 3 TO 5 FEET WEDNESDAY.  
 

 
 
BORCHARDT  
 
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

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