fzus63 kmqt 042001
glfls 
expires:202608050800;;623092

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 2026

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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue aug 4 2026 /301 pm cdt tue aug 4 2026/

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming south 5 to 15 knots
late. waves calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots veering southwest
late. waves calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots. waves building to
1 to 3 feet. 
.thursday night...southwest winds 15 to 25 knots. waves building
to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of showers. a chance of
thunderstorms by mid afternoon. waves subsiding to calm to
2 feet. 
.friday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.sunday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202608050800;;623093

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 4 2026

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...

troughing to 29.9 remains over lake superior tonight before 30.0 
inch ridging returns on wednesday as high pressure builds into the 
great lakes from the northern plains. for the late week and into the 
weekend, pressure over lake superior will remain around 29.9 to 30.0 
inches between a 30.3 inch bermuda high and 29.5 inch low pressure 
near the western shores of hudson bay.




lsz263-050800-
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-
401 pm edt tue aug 4 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing south late. waves
building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots late. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.thursday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots. a chance of showers. a
chance of thunderstorms by mid afternoon. waves subsiding to 1 to
3 feet. 
.friday night...west winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet. 

$$