fzus63 kmqt 181401
glfls 
expires:202609182000;;657401

open lake forecast for lake superior
national weather service marquette mi
1001 am edt fri sep 18 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...

30.4 inch high pressure continues to track eastward across northern 
ontario through tonight, weakening to 30.2 inches as it moves into 
western quebec saturday morning. meanwhile, 29.8 inch low pressure 
develops over the central plains, reaching western iowa by saturday 
morning as another 29.8 inch low tracks across hudson bay. saturday 
into sunday, a 30.2 inch high over the canadian prairie builds to 
30.4 inches as it moves into northwestern ontario, creating a 30.1 
inch ridging pattern over lake superior. this high pressure center 
slowly builds to 30.5 inches as it shifts into quebec by midday 
tuesday, trailing a 30.4 inch ridge over lake superior. the high 
builds further to 30.6 inches wednesday as it progresses eastward.




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt fri sep 18 2026 /901 am cdt fri sep 18 2026/

.rest of today...east winds 10 to 20 knots. a slight chance of
showers by mid afternoon. waves 1 to 3 feet building to 2 to
4 feet. 
.tonight...east winds 10 to 20 knots diminishing to 5 to 15 knots
late. a slight chance of showers through midnight. waves
subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northeast late.
waves calm to 2 feet. 
.saturday night...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots becoming east gales to
35 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...east winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.tuesday...east winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202609182000;;657402

open lake forecast for lake superior
national weather service marquette mi
1001 am edt fri sep 18 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...

30.4 inch high pressure continues to track eastward across northern 
ontario through tonight, weakening to 30.2 inches as it moves into 
western quebec saturday morning. meanwhile, 29.8 inch low pressure 
develops over the central plains, reaching western iowa by saturday 
morning as another 29.8 inch low tracks across hudson bay. saturday 
into sunday, a 30.2 inch high over the canadian prairie builds to 
30.4 inches as it moves into northwestern ontario, creating a 30.1 
inch ridging pattern over lake superior. this high pressure center 
slowly builds to 30.5 inches as it shifts into quebec by midday 
tuesday, trailing a 30.4 inch ridge over lake superior. the high 
builds further to 30.6 inches wednesday as it progresses eastward.




lsz263-182000-
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-
1001 am edt fri sep 18 2026

.rest of today...east winds 5 to 15 knots. a slight chance of
showers by mid afternoon. waves 1 to 3 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight. a slight chance of showers through midnight. waves
subsiding to calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots backing northeast late.
waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet. 
.tuesday...east winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$