990  
FZUS63 KMQT 272104  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
404 PM EST THU FEB 27 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
 
LAKE SUPERIOR IS STILL BETWEEN A 30.3 INCH RIDGE OVER  
HUDSON BAY AND A 29.1 INCH LOW IN SOUTHERN QUEBEC. THIS LOW WILL  
WEAKEN TO 29.3 INCHES BY THE TIME IT REACHES THE GULF OF ST.  
LAWRENCE FRIDAY. THE RIDGING TO THE WEST OF LAKE SUPERIOR WILL  
WEAKEN TO 30.2 INCHES AS A 30.1 INCH RIDGE CROSSES THE LAKE FRIDAY  
NIGHT INTO SATURDAY MORNING. A 29.3 INCH TROUGH IS EXPECTED TO  
LIFT NORTHEASTWARD ACROSS THE UPPER GREAT LAKES SUNDAY EVENING  
WITH SLIGHT RIDGING RETURNING MONDAY.  
 
LSZ162-280515-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
404 PM EST THU FEB 27 2020 /304 PM CST THU FEB 27 2020/  
   
LATE THIS AFTERNOON
 
NORTHWEST WINDS 5 TO 15 KNOTS. ISOLATED  
SNOW SHOWERS. WAVES 2 TO 4 FEET.    
TONIGHT
 
NORTH WINDS 10 TO 20 KNOTS. ISOLATED SNOW SHOWERS IN  
THE EVENING. WAVES 2 TO 4 FEET.    
FRIDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS BY MIDNIGHT, THEN BACKING SOUTHWEST LATE. A SLIGHT  
CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. WAVES 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
2 TO 4 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST  
AFTER MIDNIGHT. WAVES 2 TO 4 FEET.    
SUNDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST IN THE  
AFTERNOON. WAVES 2 TO 4 FEET.    
SUNDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS. WAVES 2 TO 4 FEET.    
MONDAY
 
WEST WINDS 5 TO 15 KNOTS. WAVES 2 TO 4 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. A CHANCE  
OF RAIN SHOWERS, POSSIBLY MIXED WITH SNOW. WAVES 2 TO 4 FEET.  
 

 
 
LSZ263-280515-  
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-  
404 PM EST THU FEB 27 2020  
   
LATE THIS AFTERNOON
 
NORTH WINDS 15 TO 25 KNOTS. FREEZING  
SPRAY. SCATTERED SNOW SHOWERS. WAVES 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
TONIGHT
 
NORTH WINDS 15 TO 25 KNOTS. FREEZING SPRAY. SCATTERED  
SNOW SHOWERS. WAVES 3 TO 6 FEET OCCASIONALLY TO 8 FEET.   
FRIDAY
 
NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST. HEAVY  
FREEZING SPRAY. WAVES 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
FRIDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS BY MIDNIGHT, THEN BECOMING WEST 5 TO 15 KNOTS  
LATE. FREEZING SPRAY IN THE EVENING. WAVES SUBSIDING TO CALM TO  
2 FEET.    
SATURDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO  
3 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST IN THE  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
MONDAY
 
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. A CHANCE OF RAIN SHOWERS, POSSIBLY MIXED WITH SNOW.  
WAVES BUILDING TO 2 TO 4 FEET.  
 

 
 
LSZ264-280515-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
404 PM EST THU FEB 27 2020  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH FRIDAY  
EVENING...  
...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH  
FRIDAY EVENING...  
   
LATE THIS AFTERNOON
 
NORTH WINDS 20 TO 30 KNOTS. HEAVY FREEZING  
SPRAY. ISOLATED SNOW SHOWERS. WAVES 4 TO 8 FEET OCCASIONALLY TO  
10 FEET.    
TONIGHT
 
NORTH GALES TO 35 KNOTS. HEAVY FREEZING SPRAY.  
SCATTERED SNOW SHOWERS. WAVES BUILDING TO 7 TO 10 FEET  
OCCASIONALLY TO 13 FEET.    
FRIDAY
 
NORTH GALES TO 35 KNOTS DIMINISHING TO 20 TO 30 KNOTS  
BY MID AFTERNOON. ISOLATED SNOW SHOWERS IN THE MORNING. HEAVY  
FREEZING SPRAY. WAVES SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO  
11 FEET.    
FRIDAY NIGHT
 
NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY MIDNIGHT, THEN BECOMING NORTHWEST 10 TO 20 KNOTS  
LATE. FREEZING SPRAY. WAVES SUBSIDING TO 2 TO 4 FEET.    
SATURDAY
 
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST IN THE  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO  
1 TO 3 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
SUNDAY
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH IN THE  
AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
SUNDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST AFTER  
MIDNIGHT. WAVES 2 TO 4 FEET.    
MONDAY
 
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS.  
WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.  
 

 
 
LSZ265-280515-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
404 PM EST THU FEB 27 2020  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE FRIDAY  
NIGHT...  
   
LATE THIS AFTERNOON
 
NORTHWEST WINDS 20 TO 30 KNOTS. HEAVY  
FREEZING SPRAY. SCATTERED SNOW SHOWERS. WAVES 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET.    
TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO 30 KNOTS  
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. HEAVY  
FREEZING SPRAY. SCATTERED SNOW SHOWERS. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET.    
FRIDAY
 
NORTHWEST WINDS TO 30 KNOTS WITH A FEW GALE FORCE GUSTS  
TO 35 KNOTS POSSIBLE. ISOLATED SNOW SHOWERS IN THE MORNING. HEAVY  
FREEZING SPRAY. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO  
14 FEET, THEN SUBSIDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.    
FRIDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO  
10 TO 20 KNOTS. FREEZING SPRAY. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SATURDAY
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO  
15 KNOTS IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS  
IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY
 
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM  
TO 2 FEET.    
TUESDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. A CHANCE  
OF RAIN AND SNOW SHOWERS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ266-280515-  
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-  
404 PM EST THU FEB 27 2020  
   
..GALE WARNING IN EFFECT THROUGH FRIDAY EVENING
 
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH FRIDAY  
EVENING...  
   
LATE THIS AFTERNOON
 
NORTH GALES TO 40 KNOTS. FREEZING SPRAY.  
SCATTERED SNOW SHOWERS. WAVES 7 TO 11 FEET OCCASIONALLY TO  
13 FEET.    
TONIGHT
 
NORTH GALES TO 40 KNOTS. HEAVY FREEZING SPRAY.  
SCATTERED SNOW SHOWERS IN THE EVENING. NUMEROUS SNOW SHOWERS  
AFTER MIDNIGHT. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO  
18 FEET.    
FRIDAY
 
NORTH GALES TO 40 KNOTS BACKING NORTHWEST BY MID  
AFTERNOON. HEAVY FREEZING SPRAY. SCATTERED SNOW SHOWERS. WAVES  
SUBSIDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.    
FRIDAY NIGHT
 
NORTHWEST GALES TO 35 KNOTS BECOMING NORTH 20 TO  
30 KNOTS BY MIDNIGHT, THEN BECOMING NORTHWEST 15 TO 25 KNOTS  
LATE. FREEZING SPRAY. WAVES SUBSIDING TO 4 TO 7 FEET OCCASIONALLY  
TO 9 FEET.    
SATURDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST IN  
THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
SUNDAY
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS  
IN THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
SUNDAY NIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST AFTER  
MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. A CHANCE  
OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.  
 

 
 
LSZ267-280515-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
404 PM EST THU FEB 27 2020  
   
..GALE WARNING IN EFFECT THROUGH FRIDAY EVENING
 
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE FRIDAY  
NIGHT...  
   
LATE THIS AFTERNOON
 
NORTHWEST GALES TO 40 KNOTS. HEAVY  
FREEZING SPRAY. SNOW SHOWERS. WAVES 7 TO 11 FEET OCCASIONALLY TO  
13 FEET.    
TONIGHT
 
NORTHWEST GALES TO 40 KNOTS. HEAVY FREEZING SPRAY.  
SNOW SHOWERS. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO  
18 FEET.    
FRIDAY
 
NORTH GALES TO 40 KNOTS BECOMING NORTHWEST GALES TO  
35 KNOTS. HEAVY FREEZING SPRAY. SNOW SHOWERS IN THE MORNING.  
SCATTERED SNOW SHOWERS IN THE AFTERNOON. WAVES SUBSIDING TO 8 TO  
11 FEET OCCASIONALLY TO 14 FEET.    
FRIDAY NIGHT
 
NORTH GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS BY MIDNIGHT, THEN BECOMING NORTHWEST 15 TO 25 KNOTS  
LATE. FREEZING SPRAY. WAVES SUBSIDING TO 4 TO 7 FEET OCCASIONALLY  
TO 9 FEET.    
SATURDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING WEST IN THE  
AFTERNOON. FREEZING SPRAY IN THE MORNING. WAVES SUBSIDING TO 1 TO  
3 FEET.    
SATURDAY NIGHT
 
SOUTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
SUNDAY
 
SOUTHEAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 2 TO  
4 FEET.    
SUNDAY NIGHT
 
SOUTH WINDS 15 TO 25 KNOTS VEERING WEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO  
4 FEET.    
MONDAY
 
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO  
3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO  
3 FEET.    
TUESDAY
 
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. A CHANCE OF RAIN AND SNOW SHOWERS. WAVES BUILDING TO  
2 TO 4 FEET.  
 

 
 
LSZ261-280515-  
MAFOR 2722/  
SUPERIOR WEST 11720 14830 11830 11730 11720. WAVES 1 TO 4 FEET.  
 
SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11842 19847  
11852 19857 14852 11852 11850. WAVES 5 TO 9 FEET BUILDING TO 7 TO  
10 FEET TONIGHT. WAVES 6 TO 10 FEET SUBSIDING TO 5 TO 8 FEET  
FRIDAY.  
 
SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11742 19747  
14752 19757 11752 19757 12752. WAVES 6 TO 10 FEET BUILDING TO 8  
TO 12 FEET TONIGHT AND FRIDAY.  
 
SUPERIOR EAST...GALE WARNING IN EFFECT...14757 12857 11852 19857  
11750. WAVES 7 TO 11 FEET BUILDING TO 9 TO 13 FEET TONIGHT, SUBSIDING  
TO 8 TO 11 FEET FRIDAY.  
 

 
 
TAP  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MQT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 
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