Marine Weather Forecast from Environment Canada

Winds


Issued 10:30 AM EDT 23 April 2018

Today Tonight and Tuesday. Wind southwest 15 knots backing to south 15 near midnight then diminishing to variable 10 early Tuesday morning. Wind increasing to northwest 15 late Tuesday morning then veering to north 20 Tuesday evening.

Extended Forecast


Issued 03:00 AM EDT 23 April 2018
Wednesday Wind north 15 knots diminishing to light in the afternoon.
Thursday Wind light increasing to north 20 knots.
Friday Wind northeast 20 knots diminishing to light.

Waves


Issued 10:30 AM EDT 23 April 2018

Today Tonight and Tuesday. Waves one half metre.

Ice Forecast*


Issued 12:00 PM EDT 23 April 2018

Today Tonight and Tuesday Open water except 7 tenths thick lake ice along parts of the southern and eastern shores.

*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



  
443  
FZUS63 KMQT 231936  
GLFLS  
 
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
336 PM EDT MON APR 23 2018  
 
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 RIDGE OF 30.4 INCHES EXTENDING FROM THE GREAT  
LAKES TO NEW ENGLAND WILL SLIDE EASTWARD TONIGHT. A 30.1 INCH TROUGH  
WILL CROSS LAKE SUPERIOR TONIGHT INTO TUESDAY. ANOTHER HIGH PRESSURE  
RIDGE OF 30.2 INCHES WILL REACH THE WESTERN GREAT LAKES ON  
WEDNESDAY. A 29.7 INCH TROUGH OVER NORTHERN ONTARIO THURSDAY WILL  
REACH EASTERN ONTARIO BY FRIDAY. A 29.7 INCH LOW OVER SOUTHERN  
MANITOBA FRIDAY MORNING WILL DISSIPATE OVER NORTHERN ILLINOIS  
SATURDAY MORNING. A 30.2 INCH HIGH PRESSURE RIDGE OVER NORTHERN  
ONTARIO SATURDAY MORNING WILL MOVE OVER THE GREAT LAKES SUNDAY.  
 
LSZ162-240345-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
336 PM EDT MON APR 23 2018 /236 PM CDT MON APR 23 2018/  
   
LATE THIS AFTERNOON
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER  
MIDNIGHT, THEN VEERING NORTH LATE. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST IN THE  
AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
WEDNESDAY
 
SOUTH WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH BY MID  
AFTERNOON. A CHANCE OF RAIN. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
FRIDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES CALM  
TO 2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES CALM TO  
2 FEET.  
 

 
 
LSZ263-240345-  
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-  
336 PM EDT MON APR 23 2018  
   
LATE THIS AFTERNOON
 
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM  
TO 2 FEET.    
TONIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER  
MIDNIGHT, THEN VEERING NORTH LATE. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST LATE. WAVES  
CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 5 TO 15 KNOTS. WAVES BUILDING TO  
1 TO 3 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO  
20 KNOTS BY MID AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO  
1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES CALM TO  
2 FEET.    
SATURDAY
 
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES CALM TO  
2 FEET.  
 

 
 
LSZ264-240345-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
336 PM EDT MON APR 23 2018  
   
LATE THIS AFTERNOON
 
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES 1 TO  
3 FEET.    
TONIGHT
 
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT, THEN BECOMING NORTH 10 TO 20 KNOTS LATE.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO  
15 KNOTS IN THE AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS  
LATE. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS LATE.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN  
SUBSIDING TO 2 TO 4 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS BACKING WEST BY MID  
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.    
WEDNESDAY NIGHT
 
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH BY MID  
AFTERNOON. A CHANCE OF RAIN. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY
 
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES  
BUILDING TO 1 TO 3 FEET.  
 

 
 
LSZ265-240345-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
336 PM EDT MON APR 23 2018  
   
LATE THIS AFTERNOON
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT, THEN VEERING NORTHWEST LATE. WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS LATE.  
WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
WEDNESDAY
 
NORTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.    
WEDNESDAY NIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
FRIDAY
 
EAST WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES  
BUILDING TO 1 TO 3 FEET.  
 

 
 
LSZ266-240345-  
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-  
336 PM EDT MON APR 23 2018  
   
LATE THIS AFTERNOON
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES 1 TO  
3 FEET SUBSIDING TO CALM TO 2 FEET.    
TONIGHT
 
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST LATE.  
WAVES CALM TO 2 FEET.    
TUESDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS IN THE AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS  
LATE. WAVES BUILDING TO 2 TO 4 FEET.    
TUESDAY NIGHT
 
NORTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 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
 
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH  
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY
 
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST  
10 TO 20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
THURSDAY NIGHT
 
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
FRIDAY
 
NORTH WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO  
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTH WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES  
BUILDING TO 1 TO 3 FEET.  
 

 
 
LSZ267-240345-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
336 PM EDT MON APR 23 2018  
   
LATE THIS AFTERNOON
 
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO  
2 FEET.    
TONIGHT
 
SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS LATE. WAVES CALM TO 2 FEET.    
TUESDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST IN THE  
AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. A SLIGHT  
CHANCE OF RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 2 TO  
4 FEET.    
TUESDAY NIGHT
 
NORTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH  
AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN AND SNOW THROUGH  
MIDNIGHT. 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 1 TO 3 FEET.    
WEDNESDAY NIGHT
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING  
SOUTHWEST AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY
 
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT
 
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH  
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN, POSSIBLY MIXED  
WITH SNOW THROUGH MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.    
FRIDAY
 
NORTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY
 
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES  
CALM TO 2 FEET.  
 

 
 
LSZ261-240345-  
MAFOR 2321/  
SUPERIOR WEST 11520 11510 11610 11710 11820 11810 11700 11600.  
WAVES 2 FEET OR LESS.  
 
SUPERIOR NORTH CENTRAL 12520 11510 11600 13810 11710. WAVES 1 TO  
3 FEET.  
 
SUPERIOR SOUTH CENTRAL 13400 11500 11700 12810 11710. WAVES 1  
TO 3 FEET.  
 
SUPERIOR EAST 11400 12410 12500 11600 11710 11720. WAVES 1  
TO 3 FEET.  
 

 
 
RJT  
 
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

HEAVY RAINFALL WARNING
A heavy rainfall warning is issued when heavy or prolonged rainfall is sufficient to cause local or widespread flooding. Expect 50 mm of rain over a 12 hour period or less, or 80 mm of rain in less than 24 hours. (50 mm of rain over a 24 hours or less in areas North of 60).