684  
FZUS63 KMQT 171348  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
948 AM EDT WED AUG 17 2022  
 
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
 
30.1 INCH RIDGING EXTENDING FROM A HIGH IN NORTHERN  
QUEBEC WEAKENS TO 30.0 INCHES LATE THIS AFTERNOON. A 29.8 INCH  
LOW PASSES OVER HUDSON BAY THURSDAY WHILE A SECONDARY HIGH OVER  
THE MID MISSISSIPPI RIVER VALLEY EXTENDS ANOTHER WEAK RIDGE OVER  
THE LAKE. ON FRIDAY, A 29.8 INCH LOW SLOWLY MOVES SOUTH ACROSS  
THE NORTHERN PLAINS BEFORE WEAKENING TO 29.9 INCHES SATURDAY NEAR  
IOWA. THE LOW IS THEN EXPECTED TO SHIFT SLOWLY EASTWARDS OVER  
SOUTHERN LAKE MICHIGAN SUNDAY.  
 
LSZ162-172200-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
948 AM EDT WED AUG 17 2022 /848 AM CDT WED AUG 17 2022/  
   
REST OF TODAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN  
THE AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST LATE. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING EAST LATE.  
PATCHY FOG THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF SHOWERS  
AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST  
AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM  
TO 2 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO  
20 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
FRIDAY NIGHT
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SATURDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ263-172200-  
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-  
948 AM EDT WED AUG 17 2022  
   
REST OF TODAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN  
THE AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST LATE. A  
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH LATE. A  
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.   
THURSDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST BY MID  
AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SATURDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ264-172200-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
948 AM EDT WED AUG 17 2022  
   
REST OF TODAY
 
SOUTH WINDS LESS THAN 10 KNOTS INCREASING TO  
5 TO 15 KNOTS IN THE AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN  
10 KNOTS LATE. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM  
TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS LESS THAN 10 KNOTS BACKING SOUTH  
LATE. PATCHY DENSE FOG THROUGH EARLY AFTERNOON. A SLIGHT CHANCE  
OF THUNDERSTORMS THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF  
SHOWERS. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTHEAST WINDS LESS THAN 10 KNOTS. A SLIGHT  
CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
FRIDAY
 
EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
EAST WINDS LESS THAN 10 KNOTS. A CHANCE OF  
SHOWERS. WAVES CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS LESS THAN 10 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ265-172200-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
948 AM EDT WED AUG 17 2022  
   
REST OF TODAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST  
LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
THURSDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
THURSDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING EAST BY MID  
AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ266-172200-  
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-  
948 AM EDT WED AUG 17 2022  
   
REST OF TODAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH IN  
THE AFTERNOON, THEN BACKING EAST LATE. A SLIGHT CHANCE OF SHOWERS  
BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER  
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF  
THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST LATE. A  
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS.  
WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF  
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ267-172200-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
948 AM EDT WED AUG 17 2022  
   
REST OF TODAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST IN  
THE AFTERNOON, THEN VEERING NORTH LATE. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST LESS THAN  
10 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 5 TO 15 KNOTS LATE.  
WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST LATE. A  
CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
THURSDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID  
AFTERNOON. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST AFTER  
MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO  
2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES  
CALM TO 2 FEET.    
SUNDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES CALM TO  
2 FEET.  
 

 
LSZ261-172200-  
MAFOR 1715/  
SUPERIOR WEST 12410 14400 12500. A CHANCE OF SHOWERS LATE THIS  
MORNING. A CHANCE OF SHOWERS AND THUNDERSTORMS TONIGHT AND  
THURSDAY MORNING. WAVES 1 FOOT OR LESS.  
 
SUPERIOR NORTH CENTRAL 13400 11300 13400 11500. A CHANCE OF  
SHOWERS THIS EVENING, THEN A CHANCE OF SHOWERS AND THUNDERSTORMS  
OVERNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS THURSDAY  
MORNING. WAVES 1 FOOT OR LESS.  
 
SUPERIOR SOUTH CENTRAL 11400 14300 13400. A CHANCE OF SHOWERS AND  
THUNDERSTORMS THURSDAY MORNING. WAVES 1 FOOT OR LESS.  
 
SUPERIOR EAST 12400 11200 14300 11400. A CHANCE OF SHOWERS  
THURSDAY MORNING. WAVES 1 FOOT OR LESS.  
 

 
 
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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