fzus63 kmqt 150801
glfls 
expires:202608152000;;221023

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 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...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sat aug 15 2026 /301 am cdt sat aug 15 2026/

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 10 to 20 knots backing northeast in the
afternoon. a chance of showers. a slight chance of thunderstorms
by mid afternoon. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots backing north after
midnight, then backing west late. a chance of showers and a
slight chance of thunderstorms through midnight. waves calm to
2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots
late. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves calm to 2 feet. 
.tuesday...west winds 5 to 15 knots veering north. a chance of
showers. waves calm to 2 feet. 
.wednesday...north winds 5 to 15 knots backing northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221024

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 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...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz263-152000-
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 am edt sat aug 15 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a chance of showers. a slight chance of thunderstorms by
mid afternoon. waves calm to 2 feet. 
.tonight...east winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then backing west late. a slight chance
of thunderstorms through midnight. a chance of showers. waves
calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves subsiding to calm to 2 feet.
.tuesday...west winds 5 to 15 knots becoming north 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.wednesday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$