381  
FZUS63 KMQT 282103  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
403 PM EST SUN FEB 28 2021  
 
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 29.5 INCH LOW OVER THE EASTERN UPPER PENINSULA  
THIS AFTERNOON MOVES INTO ONTARIO THIS EVENING. THE LOW WILL  
FURTHER DEEPEN TO 29.2 INCHES AS IT MOVES INTO QUEBEC EARLY MONDAY  
MORNING. RIDGING OF 30.4 INCHES BUILDS OVER WESTERN LAKE SUPERIOR  
ON MONDAY AHEAD OF A 29.5 INCH TROUGH ENTERING WESTERN ONTARIO  
MONDAY NIGHT. THIS TROUGH IS EXPECTED TO TRACK NORTH OF LAKE  
SUPERIOR ON TUESDAY DROPPING A 29.7 INCH TROUGH OVER THE LAKE  
THAT WEAKENS TO 30.0 INCHES BY WEDNESDAY MORNING. BROAD RIDGING  
BUILDS ACROSS THE NORTHERN PLAINS ON THURSDAY WITH 30.4 INCH  
RIDGING OVER LAKE SUPERIOR THAT PERSISTS THROUGH FRIDAY.  
 
LSZ162-010515-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
403 PM EST SUN FEB 28 2021 /303 PM CST SUN FEB 28 2021/  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 7 PM EST /6 PM  
CST/ THIS EVENING THROUGH MONDAY EVENING...  
   
LATE THIS AFTERNOON
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES 2 TO  
4 FEET.    
TONIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS. HEAVY FREEZING SPRAY.  
ISOLATED SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
MONDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS BY LATE MORNING, THEN BACKING WEST BY MID AFTERNOON.  
HEAVY FREEZING SPRAY IN THE MORNING. WAVES SUBSIDING TO CALM TO  
2 FEET.    
MONDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST  
15 TO 25 KNOTS BY MIDNIGHT, THEN INCREASING TO 20 TO 30 KNOTS  
LATE. FREEZING SPRAY AFTER MIDNIGHT. WAVES BUILDING TO 4 TO  
7 FEET OCCASIONALLY TO 9 FEET.    
TUESDAY
 
SOUTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 4 TO  
8 FEET OCCASIONALLY TO 10 FEET.    
TUESDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST IN THE  
AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING  
NORTHEAST AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES  
CALM TO 2 FEET.    
FRIDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ263-010515-  
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-  
403 PM EST SUN FEB 28 2021  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 7 PM EST THIS  
EVENING THROUGH MONDAY EVENING...  
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH MONDAY  
MORNING...  
   
LATE THIS AFTERNOON
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES 2 TO  
4 FEET.    
TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS. HEAVY FREEZING SPRAY.  
ISOLATED SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6  
FEET OCCASIONALLY TO 8 FEET.    
MONDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY LATE MORNING, THEN BECOMING WEST 10 TO 20 KNOTS BY  
MID AFTERNOON. ISOLATED SNOW SHOWERS IN THE MORNING. HEAVY  
FREEZING SPRAY. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO  
9 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
MONDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST  
15 TO 25 KNOTS BY MIDNIGHT, THEN INCREASING TO 20 TO 30 KNOTS  
LATE. FREEZING SPRAY AFTER MIDNIGHT. WAVES BUILDING TO 5 TO  
8 FEET OCCASIONALLY TO 10 FEET.    
TUESDAY
 
SOUTHWEST GALES TO 35 KNOTS. FREEZING SPRAY IN THE  
MORNING. WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET,  
THEN SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.    
TUESDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHEAST  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO  
3 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ264-010515-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
403 PM EST SUN FEB 28 2021  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 10 PM EST THIS  
EVENING THROUGH LATE MONDAY NIGHT...  
...GALE WARNING IN EFFECT FROM 1 AM EST MONDAY THROUGH MONDAY  
AFTERNOON...  
   
LATE THIS AFTERNOON
 
NORTHWEST WINDS 20 TO 30 KNOTS. A CHANCE  
OF SNOW. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY  
TO 7 FEET.    
TONIGHT
 
NORTHWEST GALES TO 35 KNOTS. HEAVY FREEZING SPRAY.  
ISOLATED SNOW SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 6 TO  
9 FEET OCCASIONALLY TO 11 FEET.    
MONDAY
 
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS BY LATE MORNING, THEN BECOMING WEST 15 TO 25 KNOTS BY  
MID AFTERNOON. HEAVY FREEZING SPRAY. SCATTERED SNOW SHOWERS.  
WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET, THEN  
SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS BACKING SOUTHWEST BY  
MIDNIGHT, THEN INCREASING TO 20 TO 30 KNOTS LATE. FREEZING SPRAY.  
WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
TUESDAY
 
SOUTHWEST GALES TO 35 KNOTS VEERING WEST IN THE  
AFTERNOON. FREEZING SPRAY IN THE MORNING. WAVES BUILDING TO 6 TO  
10 FEET OCCASIONALLY TO 13 FEET.    
TUESDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO 1 TO  
3 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS. FREEZING SPRAY. WAVES  
BUILDING TO 1 TO 3 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS. FREEZING SPRAY. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO  
2 TO 4 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ265-010515-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
403 PM EST SUN FEB 28 2021  
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 10 PM EST THIS  
EVENING THROUGH LATE MONDAY NIGHT...  
...GALE WARNING IN EFFECT FROM 1 AM EST MONDAY THROUGH MONDAY  
AFTERNOON...  
   
LATE THIS AFTERNOON
 
NORTHWEST GALES TO 35 KNOTS. AREAS OF  
DENSE FOG AND DENSE FREEZING FOG. SNOW. WAVES 2 TO 4 FEET  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO  
35 KNOTS BY MIDNIGHT. HEAVY FREEZING SPRAY. SNOW. WAVES BUILDING  
TO 5 TO 9 FEET OCCASIONALLY TO 11 FEET.    
MONDAY
 
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY MID AFTERNOON. HEAVY FREEZING SPRAY. SCATTERED SNOW  
SHOWERS. WAVES BUILDING TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET,  
THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
MONDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST  
10 TO 20 KNOTS BY MIDNIGHT, THEN INCREASING TO 15 TO 25 KNOTS  
LATE. WAVES SUBSIDING TO 1 TO 3 FEET.    
TUESDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS. PATCHY BLOWING SNOW IN  
THE MORNING. WAVES BUILDING TO 2 TO 4 FEET.    
TUESDAY NIGHT
 
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS. WAVES 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET, THEN  
BUILDING TO 1 TO 3 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET, THEN BUILDING TO 1 TO 3 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ266-010515-  
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-  
403 PM EST SUN FEB 28 2021  
   
..GALE WARNING IN EFFECT THROUGH MONDAY EVENING
 
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 10 PM EST THIS  
EVENING THROUGH LATE MONDAY NIGHT...  
   
LATE THIS AFTERNOON
 
NORTH GALES TO 35 KNOTS. AREAS OF DENSE  
FOG AND DENSE FREEZING FOG. SNOW, POSSIBLY MIXED WITH RAIN. WAVES  
2 TO 4 FEET BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TONIGHT
 
NORTHWEST GALES TO 40 KNOTS. HEAVY FREEZING SPRAY.  
SNOW. WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET,  
THEN SUBSIDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET.    
MONDAY
 
NORTHWEST GALES TO 45 KNOTS DIMINISHING TO 20 TO  
30 KNOTS BY MID AFTERNOON. HEAVY FREEZING SPRAY. NUMEROUS SNOW  
SHOWERS IN THE MORNING. SCATTERED SNOW SHOWERS IN THE AFTERNOON.  
WAVES BUILDING TO 10 TO 14 FEET OCCASIONALLY TO 18 FEET, THEN  
SUBSIDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.    
MONDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST  
10 TO 20 KNOTS BY MIDNIGHT, THEN BECOMING SOUTHWEST 15 TO  
25 KNOTS LATE. ISOLATED SNOW SHOWERS IN THE EVENING. FREEZING  
SPRAY. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,  
THEN BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.    
TUESDAY
 
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST IN THE  
AFTERNOON. FREEZING SPRAY IN THE MORNING. A SLIGHT CHANCE OF SNOW  
SHOWERS IN THE AFTERNOON. WAVES BUILDING TO 6 TO 9 FEET  
OCCASIONALLY TO 11 FEET.    
TUESDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 2 TO  
4 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. FREEZING SPRAY. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS. FREEZING SPRAY. WAVES  
BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ267-010515-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
403 PM EST SUN FEB 28 2021  
   
..GALE WARNING IN EFFECT THROUGH MONDAY EVENING
 
 
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 10 PM EST THIS  
EVENING THROUGH LATE MONDAY NIGHT...  
   
LATE THIS AFTERNOON
 
NORTH WINDS 20 TO 30 KNOTS. AREAS OF DENSE  
FOG. SNOW, POSSIBLY MIXED WITH RAIN. WAVES 1 TO 3 FEET.    
TONIGHT
 
NORTHWEST GALES TO 40 KNOTS. A CHANCE OF RAIN IN THE  
EVENING. SNOW. FREEZING SPRAY AFTER MIDNIGHT. WAVES BUILDING TO  
10 TO 14 FEET OCCASIONALLY TO 18 FEET, THEN SUBSIDING TO 9 TO  
12 FEET OCCASIONALLY TO 15 FEET.    
MONDAY
 
NORTHWEST GALES TO 40 KNOTS. HEAVY FREEZING SPRAY. SNOW  
SHOWERS. WAVES SUBSIDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.   
MONDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST  
15 TO 25 KNOTS BY MIDNIGHT, THEN BACKING SOUTHWEST LATE. FREEZING  
SPRAY. ISOLATED SNOW SHOWERS. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
TUESDAY
 
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST IN THE  
AFTERNOON. FREEZING SPRAY IN THE MORNING. A SLIGHT CHANCE OF SNOW  
SHOWERS IN THE AFTERNOON. WAVES BUILDING TO 4 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
TUESDAY NIGHT
 
WEST WINDS 15 TO 25 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST IN THE  
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO  
4 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS. FREEZING SPRAY. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ261-010515-  
MAFOR 2822/  
SUPERIOR WEST...GALE WARNING IN EFFECT...11731 11740 14732 11722  
11620. WAVES 2 TO 4 FEET BUILDING TO 3 TO 5 FEET TONIGHT. WAVES 3  
TO 5 FEET SUBSIDING TO 1 TO 3 FEET MONDAY. WAVE HEIGHTS ARE FOR  
ICE FREE AREAS.  
 
SUPERIOR NORTH CENTRAL...GALE WARNING IN EFFECT...11754 11750  
12752 12752 19757 11742 19747 11742. A CHANCE OF SNOW THIS  
EVENING. WAVES 2 TO 4 FEET BUILDING TO 6 TO 9 FEET TONIGHT. WAVES  
5 TO 9 FEET SUBSIDING TO 3 TO 6 FEET MONDAY.  
 
SUPERIOR SOUTH CENTRAL...GALE WARNING IN EFFECT...11757 19754  
11751 11750 11752 13752 19757 11742. WAVES 2 TO 4 FEET BUILDING  
TO 7 TO 11 FEET TONIGHT. WAVES 8 TO 12 FEET SUBSIDING TO 6 TO 9  
FEET MONDAY.  
 
SUPERIOR EAST...GALE WARNING IN EFFECT...11857 19854 11757 11751  
19757 14757 11757. A CHANCE OF RAIN THIS EVENING. WAVES 2 TO 3  
FEET BUILDING TO 9 TO 13 FEET TONIGHT. WAVES 10 TO 14 FEET  
SUBSIDING TO 8 TO 11 FEET MONDAY.  
 

 
 
EK  
 
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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