969  
FZUS63 KMQT 200758  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
358 AM EDT SAT APR 20 2019  
 
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
 
HIGH PRESSURE OF 30.0 INCHES OVER LAKE SUPERIOR WILL  
REMAIN IN PLACE THROUGH THIS AFTERNOON. TONIGHT INTO SUNDAY MORNING,  
A WEAK LOW PRESSURE OF 29.7 INCHES WILL PASS OVER LAKE SUPERIOR.  
A HIGH PRESSURE RIDGE FOLLOWS, BUILDING TO 30.3 INCHES ACROSS THE  
REGION EARLY NEXT WEEK. MEANWHILE, A 29.8 INCH LOW TRACKS ACROSS  
SOUTHERN WISCONSIN MONDAY NIGHT INTO TUESDAY MORNING AND THEN  
ACROSS LOWER MICHIGAN THROUGH TUESDAY EVENING. THE HIGH PRESSURE  
OVER LAKE SUPERIOR WILL WEAKEN TO 30.0 INCHES ON WEDNESDAY AS AN  
A LOW PRESSURE TROUGH OF 29.6 INCHES APPROACHES NORTHERN ONTARIO  
FROM MANITOBA.  
 
LSZ162-201600-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
358 AM EDT SAT APR 20 2019 /258 AM CDT SAT APR 20 2019/  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TONIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES  
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.    
TUESDAY
 
EAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.    
WEDNESDAY
 
SOUTH WINDS LESS THAN 10 KNOTS BECOMING WEST 5 TO  
15 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ263-201600-  
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-  
358 AM EDT SAT APR 20 2019  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER  
MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES  
BUILDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,  
THEN SUBSIDING TO 2 TO 4 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.    
TUESDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST. A  
CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ264-201600-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
358 AM EDT SAT APR 20 2019  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST LATE. WAVES  
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER  
MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 1 TO  
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO  
4 FEET.    
MONDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO 1 TO  
3 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO  
2 TO 4 FEET.    
TUESDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN  
10 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN SHOWERS.  
WAVES BUILDING TO 1 TO 3 FEET.  
 

 
 
LSZ265-201600-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
358 AM EDT SAT APR 20 2019  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST LATE. A  
CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO  
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST IN THE  
AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. A CHANCE OF  
RAIN SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO  
3 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO  
3 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 1 TO  
3 FEET.  
 

 
 
LSZ266-201600-  
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-  
358 AM EDT SAT APR 20 2019  
   
EARLY THIS MORNING
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TODAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM  
TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS AFTER MIDNIGHT. WAVES  
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. WAVES  
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES  
SUBSIDING TO 1 TO 3 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES  
BUILDING TO 1 TO 3 FEET.  
 

 
 
LSZ267-201600-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
358 AM EDT SAT APR 20 2019  
   
EARLY THIS MORNING
 
VARIABLE WINDS LESS THAN 10 KNOTS. WAVES  
CALM TO 2 FEET.    
TODAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING EAST IN THE  
AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST IN THE  
AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS. WAVES CALM TO 2 FEET.   
SUNDAY NIGHT
 
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS THROUGH MIDNIGHT, THEN RAIN SHOWERS LIKELY AFTER  
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.    
MONDAY
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.    
MONDAY NIGHT
 
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.    
TUESDAY
 
NORTH WINDS 10 TO 20 KNOTS VEERING EAST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES CALM TO 2 FEET.  
 
NOTE, WAVE HEIGHT FORECASTS ARE FOR ICE FREE AREAS.  
 

 
 
LSZ261-201600-  
MAFOR 2009/  
SUPERIOR WEST 14410 11300 11210 12110. A CHANCE OF RAIN SHOWERS  
OVERNIGHT. WAVES 2 FEET OR LESS.  
 
SUPERIOR NORTH CENTRAL 14410 12310 11210 11110. WAVES 1 TO 3  
FEET.  
 
SUPERIOR SOUTH CENTRAL 11400 11410 14310 11410 11510. WAVES 2  
FEET OR LESS TODAY. WAVES 1 TO 3 FEET TONIGHT.  
 
SUPERIOR EAST 11900 11400 12300 11210 12310 11300. WAVES 1 FOOT  
OR LESS.  
 

 
 
JLA  
 
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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