Marine Weather Forecast from Environment Canada

Winds


Issued 06:30 PM EDT 12 April 2021

Tonight and Tuesday. Wind southeast 15 knots diminishing to southeast 10 Tuesday morning.

Extended Forecast


Issued 06:30 PM EDT 12 April 2021
Wednesday Wind northwest 15 knots increasing to north 25 late in the day.
Thursday Wind north 25 knots.
Friday Wind north 15 knots.

Waves


Issued 06:30 PM EDT 12 April 2021

Tonight and Tuesday. Waves one half metre subsiding to less than one half metre near noon Tuesday.

Weather & Visibility


Issued 06:30 PM EDT 12 April 2021

Tonight and Tuesday.Periods of rain and fog patches.

Ice Forecast*


Issued 12:00 PM EDT 12 April 2021

Today Tonight and Tuesday Open water.

*Ice Forecast and Warnings also apply to U.S. waters

 

Lake Superior Mafor Forecast and Weather Conditions
From NOAA National Weather Service Weather Forecast Office



  
890  
FZUS63 KMQT 130140  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
940 PM EDT MON APR 12 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 29.8 INCH LOW OVER WESTERN LAKE SUPERIOR WILL  
CONTINUE TO SLOWLY SHIFT TOWARD NORTHERN MINNESOTA OVERNIGHT.  
THE LOW WILL GRADUALLY WEAKEN TO 30.0 INCHES AND REMAIN OVER THE  
UPPER GREAT LAKES THROUGH EARLY WEDNESDAY, AND THEN BEGIN TO  
SHIFT EASTWARD. A 30.1 RIDGE WILL APPROACH WESTERN LAKE SUPERIOR  
BY WEDNESDAY. THIS RIDGE WILL SETTLE OVER THE LAKE THROUGH THE  
REMAINDER OF THE WEEK, INTO THE WEEKEND.  
 
LSZ162-130945-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
940 PM EDT MON APR 12 2021 /840 PM CDT MON APR 12 2021/  
   
REST OF TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. AREAS OF  
FOG. SCATTERED RAIN SHOWERS. WAVES 1 TO 3 FEET SUBSIDING TO CALM  
TO 2 FEET, THEN BUILDING TO 2 TO 4 FEET.    
TUESDAY
 
SOUTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS LATE. PATCHY FOG THROUGH EARLY AFTERNOON. SCATTERED RAIN  
SHOWERS, POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW SHOWERS. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF SNOW  
SHOWERS THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS.  
WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES 1 TO 3 FEET.   
THURSDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
FRIDAY
 
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES CALM  
TO 2 FEET.    
SATURDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ263-130945-  
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-  
940 PM EDT MON APR 12 2021  
   
REST OF TONIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS. AREAS OF FOG BY  
LATE EVENING. PATCHY DENSE FOG AFTER MIDNIGHT. SCATTERED RAIN  
SHOWERS. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET, THEN  
BUILDING TO 1 TO 3 FEET.    
TUESDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS LATE. PATCHY FOG THROUGH EARLY AFTERNOON. ISOLATED RAIN  
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO  
3 FEET.    
TUESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST LATE.  
A CHANCE OF SNOW SHOWERS, POSSIBLY MIXED WITH RAIN. PATCHY FOG  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS. PATCHY FOG THROUGH EARLY  
AFTERNOON. A SLIGHT CHANCE OF SNOW SHOWERS THROUGH EARLY  
AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO  
3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES CALM  
TO 2 FEET.    
SATURDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ264-130945-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
940 PM EDT MON APR 12 2021  
   
REST OF TONIGHT
 
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST  
LESS THAN 10 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 5 TO  
15 KNOTS LATE. AREAS OF DENSE FOG. RAIN SHOWERS BY LATE EVENING.  
SCATTERED RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET  
SUBSIDING TO CALM TO 2 FEET.    
TUESDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST IN THE  
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. SCATTERED RAIN  
SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
TUESDAY NIGHT
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST LATE.  
A CHANCE OF RAIN SHOWERS, POSSIBLY MIXED WITH SNOW. PATCHY FOG  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS. PATCHY FOG. A CHANCE OF  
RAIN SHOWERS, POSSIBLY MIXED WITH SNOW. WAVES BUILDING TO 3 TO  
6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS. GALE FORCE GUSTS TO  
35 KNOTS MAY BRIEFLY OCCUR. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET.   
THURSDAY
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 2 TO  
4 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ265-130945-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
940 PM EDT MON APR 12 2021  
   
REST OF TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT, THEN BACKING SOUTH LATE. PATCHY FOG BY LATE  
EVENING. AREAS OF DENSE FOG AFTER MIDNIGHT. SCATTERED RAIN  
SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY
 
WEST WINDS 5 TO 15 KNOTS VEERING NORTH IN THE  
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. SCATTERED RAIN  
SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST  
AFTER MIDNIGHT. PATCHY FOG. A CHANCE OF RAIN AND SNOW SHOWERS.  
WAVES CALM TO 2 FEET.    
WEDNESDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO  
25 KNOTS BY MID AFTERNOON. PATCHY FOG. A CHANCE OF SNOW SHOWERS,  
POSSIBLY MIXED WITH RAIN. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH  
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ266-130945-  
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-  
940 PM EDT MON APR 12 2021  
   
REST OF TONIGHT
 
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH  
AFTER MIDNIGHT. PATCHY FOG BY LATE EVENING, THEN AREAS OF DENSE  
FOG AFTER MIDNIGHT. RAIN SHOWERS BY LATE EVENING, THEN SCATTERED  
RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET SUBSIDING TO CALM  
TO 2 FEET.    
TUESDAY
 
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
IN THE AFTERNOON, THEN VEERING NORTH LATE. PATCHY FOG THROUGH  
EARLY AFTERNOON. SCATTERED RAIN SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST  
AFTER MIDNIGHT. PATCHY FOG. A CHANCE OF RAIN SHOWERS, POSSIBLY  
MIXED WITH SNOW. WAVES CALM TO 2 FEET.    
WEDNESDAY
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS BY MID AFTERNOON. PATCHY FOG. A SLIGHT CHANCE OF SNOW  
SHOWERS THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF RAIN SHOWERS.  
WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS AFTER MIDNIGHT. GALE FORCE GUSTS TO 35 KNOTS MAY BRIEFLY  
OCCUR. PATCHY FOG THROUGH MIDNIGHT. A CHANCE OF RAIN SHOWERS.  
WAVES BUILDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.    
THURSDAY
 
NORTH WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO  
25 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
 
LSZ267-130945-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
940 PM EDT MON APR 12 2021  
   
REST OF TONIGHT
 
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH  
LATE. PATCHY FOG. RAIN SHOWERS BY LATE EVENING. SCATTERED RAIN  
SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO  
2 FEET.    
TUESDAY
 
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON, THEN VEERING SOUTH LATE. PATCHY FOG THROUGH EARLY  
AFTERNOON. ISOLATED RAIN SHOWERS. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST  
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS. A SLIGHT CHANCE OF SNOW  
SHOWERS AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO  
2 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS BY MID AFTERNOON. PATCHY FOG. A CHANCE OF RAIN SHOWERS.  
WAVES BUILDING TO 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS. A CHANCE OF RAIN  
SHOWERS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.    
THURSDAY
 
NORTH WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 3 TO  
5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO  
1 TO 3 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO  
1 TO 3 FEET.    
SATURDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.  
 

 
LSZ261-130945-  
MAFOR 1303/  
SUPERIOR WEST 11503 11520 19524 11520 12530 11520 11510 11500. A  
CHANCE OF SNOW SHOWERS TUESDAY EVENING. WAVES 2 TO 3 FEET  
OVERNIGHT. WAVES 3 TO 5 FEET SUBSIDING TO 2 TO 4 FEET TUESDAY.  
WAVES 1 TO 3 FEET TUESDAY EVENING.  
 
SUPERIOR NORTH CENTRAL 11406 19403 11506 19504 11504 11510 19516  
11500 11610 12600. A CHANCE OF SNOW SHOWERS TUESDAY EVENING.  
WAVES 1 TO 3 FEET.  
 
SUPERIOR SOUTH CENTRAL 11406 11404 11500 19504 11600 19606 11700  
19706 11800 19806 11806 11800. A CHANCE OF SNOW SHOWERS TUESDAY  
EVENING. WAVES 2 FEET OR LESS.  
 
SUPERIOR EAST 11326 11414 11410 19416 11410 11510 19516 11600  
11100 11300. WAVES 1 TO 3 FEET.  
 

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




Random Weather Facts

Canadian Facts and Trivia - THE DISASTERS
Heat waves can kill, especially in the ages before air conditioning.

In July 1936, a heat wave marked by temperatures in excess of 44oC killed 1,180 people in Manitoba and Ontario, with most of the victims elderly and infants, according to Environment Canada. Four hundred of the victims drowned in rivers and lakes trying to escape the heat.

From Environment Canada: "The heat was so intense that steel rail lines and bridge girders twisted, sidewalks buckled, crops wilted and fruit baked on trees."