459  
FZUS63 KMQT 211338  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
938 AM EDT MON AUG 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
 
30.1 HIGH PRESSURE OVER NORTHERN MINNESOTA WILL MOVE  
ACROSS THE NORTHERN GREAT LAKES TODAY. LOW PRESSURE OF 29.8 INCHES  
OVER THE CENTRAL PLAINS WILL MOVE THROUGH NORTHERN LAKE HURON BY  
EARLY TUESDAY. A 30.2 INCH HIGH PRESSURE EXTENDING FROM MANITOBA  
TO NEBRASKA TUESDAY NIGHT WILL MOVE OVER WISCONSIN THURSDAY  
MORNING AND REMAIN OVER THE GREAT LAKES THROUGH FRIDAY.  
 
LSZ162-212145-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
938 AM EDT MON AUG 21 2017 /838 AM CDT MON AUG 21 2017/  
   
REST OF TODAY
 
SOUTHWEST WINDS LESS THAN 10 KNOTS INCREASING TO  
5 TO 15 KNOTS IN THE AFTERNOON, THEN BACKING NORTHEAST LATE. A  
SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST AFTER  
MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. A SLIGHT CHANCE  
OF SHOWERS THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS BACKING WEST IN THE  
AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES  
BUILDING TO 1 TO 3 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES CALM TO  
2 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST. WAVES CALM  
TO 2 FEET.  
 

 
 
LSZ263-212145-  
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-  
938 AM EDT MON AUG 21 2017  
   
REST OF TODAY
 
WEST WINDS LESS THAN 10 KNOTS BACKING SOUTHWEST  
IN THE AFTERNOON, THEN BECOMING NORTHEAST 5 TO 15 KNOTS LATE. A  
SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER MIDNIGHT,  
THEN BACKING NORTHWEST LATE. A SLIGHT CHANCE OF SHOWERS THROUGH  
MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO  
25 KNOTS IN THE AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID  
AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST  
LESS THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS LESS THAN 10 KNOTS BECOMING SOUTHWEST  
5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ264-212145-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
938 AM EDT MON AUG 21 2017  
   
REST OF TODAY
 
WEST WINDS LESS THAN 10 KNOTS BACKING SOUTH  
LATE. WAVES CALM TO 2 FEET.    
TONIGHT
 
SOUTHEAST WINDS LESS THAN 10 KNOTS BECOMING NORTHWEST  
5 TO 15 KNOTS LATE. A SLIGHT CHANCE OF SHOWERS. WAVES CALM TO  
2 FEET.    
TUESDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO  
25 KNOTS LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO  
3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES  
CALM TO 2 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ265-212145-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
938 AM EDT MON AUG 21 2017  
   
REST OF TODAY
 
WEST WINDS 5 TO 15 KNOTS BACKING EAST LATE. A  
SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO 20 KNOTS  
AFTER MIDNIGHT, THEN BECOMING NORTHWEST 5 TO 15 KNOTS LATE.  
SHOWERS LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS THROUGH  
MIDNIGHT, THEN A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES CALM TO  
2 FEET.    
TUESDAY
 
NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS IN THE AFTERNOON, THEN BACKING WEST LATE. WAVES BUILDING  
TO 2 TO 4 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES  
CALM TO 2 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO 20 KNOTS.  
WAVES CALM TO 2 FEET.  
 

 
 
LSZ266-212145-  
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-  
938 AM EDT MON AUG 21 2017  
   
REST OF TODAY
 
WEST WINDS 5 TO 15 KNOTS BACKING EAST LATE. A  
SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. A SLIGHT  
CHANCE OF THUNDERSTORMS THROUGH MIDNIGHT. A CHANCE OF SHOWERS.  
PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO  
30 KNOTS IN THE AFTERNOON, THEN BACKING WEST LATE. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING  
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES  
CALM TO 2 FEET.    
FRIDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ267-212145-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
938 AM EDT MON AUG 21 2017  
   
REST OF TODAY
 
WEST WINDS 5 TO 15 KNOTS BACKING EAST LATE.  
WAVES CALM TO 2 FEET.    
TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTH LATE. PATCHY  
FOG. SHOWERS LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES  
CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 20 TO  
30 KNOTS IN THE AFTERNOON, THEN BECOMING WEST GALES TO 35 KNOTS  
LATE. PATCHY FOG THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF  
SHOWERS THROUGH EARLY AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING  
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES CALM TO 2 FEET.    
FRIDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES CALM  
TO 2 FEET.  
 

 
LSZ261-212145-  
MAFOR 2115/  
SUPERIOR WEST 11500 11600 11100 11200 11300 11710 11720 11730.  
WAVES CALM TO 3 FEET.  
 
SUPERIOR NORTH CENTRAL 11600 11500 11400 12300 11400 11710 11720.  
WAVES 2 FEET OR LESS.  
 
SUPERIOR SOUTH CENTRAL 11700 11800 12200 11206 11810 11710 11720.  
CHANCE OF SHOWERS THIS EVENING THROUGH LATE TONIGHT. WAVES 2 FEET  
OR LESS.  
 
SUPERIOR EAST 11600 11500 11300 11200 11206 11216 11816 11720.  
PATCHY FOG OVERNIGHT THROUGH MID MORNING TUESDAY. CHANCE OF  
SHOWERS LATE THIS EVENING THROUGH MID MORNING TUESDAY. WAVES 1 TO  
3 FEET.  
 

 
 
PETRO  
 
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT  
WEATHER.GOV/MQT/GLFTABLE  
 
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:  
WEATHER.GOV/GREATLAKES  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab MI Page Main Text Page