fzus63 kmqt 062001
glfls 
expires:202608070800;;731108

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu aug 6 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...

a 30.1 inch high over the upper great lakes today keeps 30.0 inch 
ridging over lake superior until tonight as the weak high travels 
east towards the st. lawrence river. by friday, a cold front brings 
29.8 inch troughing across the lake before 29.9 inch ridging returns 
with a high digging towards the ohio river valley late friday night 
into saturday. while some weak 29.8 inch troughing could be seen 
over lake superior saturday night, weak 29.9 inch ridging settles 
once again over the lake sunday and monday, with a weak 29.8 inch 
trough potentially passing through sunday evening. the high pressure 
ridging could increase to 30.0 inches by tuesday. 




lsz162-070800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt thu aug 6 2026 /301 pm cdt thu aug 6 2026/

.late this afternoon...south winds 15 to 25 knots. waves 1 to
3 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots veering west late. a
chance of showers and thunderstorms. waves subsiding to calm to
2 feet. 
.friday night...west winds 10 to 20 knots veering northwest after
midnight, then backing west late. waves calm to 2 feet. 
.saturday...west winds 10 to 20 knots backing southwest by mid
afternoon. waves building to 1 to 3 feet. 
.saturday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.sunday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots backing north after
midnight. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.tuesday...southwest winds 5 to 15 knots veering west. waves calm
to 2 feet. 

$$

fzus63 kmqt 062001
glfls 
expires:202608070800;;731109

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu aug 6 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...

a 30.1 inch high over the upper great lakes today keeps 30.0 inch 
ridging over lake superior until tonight as the weak high travels 
east towards the st. lawrence river. by friday, a cold front brings 
29.8 inch troughing across the lake before 29.9 inch ridging returns 
with a high digging towards the ohio river valley late friday night 
into saturday. while some weak 29.8 inch troughing could be seen 
over lake superior saturday night, weak 29.9 inch ridging settles 
once again over the lake sunday and monday, with a weak 29.8 inch 
trough potentially passing through sunday evening. the high pressure 
ridging could increase to 30.0 inches by tuesday. 




lsz263-070800-
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 thu aug 6 2026

.late this afternoon...south winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.tonight...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.friday...southwest winds 10 to 20 knots becoming west 5 to
15 knots late. a chance of showers and thunderstorms. waves
subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight, then backing west late. waves calm to 2 feet. 
.saturday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.saturday night...southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.sunday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots becoming west less than
10 knots after midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 

$$