fzus63 kmqt 310801
glfls 
expires:202608312000;;653599

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon aug 31 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 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.0 
inches through friday. ridging will continue to build into the early 
weekend, reaching 30.1 inches.




lsz162-312000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt mon aug 31 2026 /301 am cdt mon aug 31 2026/

.early this morning...east winds 10 to 20 knots. patchy fog. a
chance of showers and thunderstorms. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.today...east winds 5 to 15 knots backing northeast in the
afternoon, then backing west late. patchy fog through early
afternoon. a slight chance of showers and thunderstorms through
early afternoon. waves subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...northeast 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. 
.friday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 310801
glfls 
expires:202608312000;;653600

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon aug 31 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 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.0 
inches through friday. ridging will continue to build into the early 
weekend, reaching 30.1 inches.




lsz263-312000-
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 mon aug 31 2026

.early this morning...east winds 10 to 20 knots. patchy fog.
showers likely and a chance of thunderstorms. waves 1 to 3 feet. 
.today...southeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon, then veering west late. patchy fog. a
chance of showers and a slight chance of thunderstorms. waves
1 to 3 feet. 
.tonight...west winds 5 to 15 knots backing southwest after
midnight. patchy fog. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. waves building
to 2 to 4 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...east winds less than 10 knots. waves calm to
2 feet. 
.thursday...east winds 10 to 20 knots. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. waves calm to 2 feet. 

$$