fzus63 kmqt 301500
glfls 
expires:202511302100;;769135

open lake forecast for lake superior
national weather service marquette mi
1000 am est sun nov 30 2025

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 29.7 inch low pressure over lake huron tracks across georgian bay 
this afternoon while 30.6 inch high pressure expands over the 
northern plains. as the low quickly moves to the mouth of the st 
lawrence river monday morning, the high will weaken slightly to 30.5 
inches just southwest of the great lakes. this high weakens to 30.3 
inches over the lower great lakes monday evening while a weak 30.0 
inch trough descends over the lake from northern ontario. after the 
trough briefly deepens to 29.9 inches, a weak 30.0 inch ridge moves 
over the lake tuesday morning as a 29.7 inch clipper low forms over 
saskatchewan. the low weakens slightly to 29.8 inches tuesday 
evening as it approaches lake superior. by wednesday afternoon, the 
low will deepen to 29.6 inches south of james bay while a 30.5 inch 
high builds over the high plains. as the low departs to the east, 
the high shifts over the central plains thursday morning, moving 
south of the great lakes thursday evening.



lsz162-302100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est sun nov 30 2025 /900 am cst sun nov 30 2025/

.rest of today...north winds 15 to 25 knots backing northwest. a
slight chance of snow showers late in the morning. waves 4 to
7 feet occasionally to 9 feet subsiding to 2 to 4 feet. 
.tonight...northwest winds 15 to 25 knots backing west by
midnight. waves subsiding to 1 to 3 feet, then building to 2 to
4 feet. 
.monday...west winds 20 to 30 knots backing southwest. a slight
chance of snow showers in the afternoon. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.monday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a slight chance of snow showers. waves
subsiding to calm to 2 feet. 
.tuesday...west winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.tuesday night...southwest winds 15 to 25 knots veering west
after midnight. a chance of snow showers in the evening, then
snow showers likely after midnight. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.wednesday...northwest winds 20 to 30 knots. a chance of snow
showers. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.thursday...west winds 20 to 30 knots becoming southwest gales to
35 knots. a chance of snow showers. waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 

$$

fzus63 kmqt 301500
glfls 
expires:202511302100;;769136

open lake forecast for lake superior
national weather service marquette mi
1000 am est sun nov 30 2025

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 29.7 inch low pressure over lake huron tracks across georgian bay 
this afternoon while 30.6 inch high pressure expands over the 
northern plains. as the low quickly moves to the mouth of the st 
lawrence river monday morning, the high will weaken slightly to 30.5 
inches just southwest of the great lakes. this high weakens to 30.3 
inches over the lower great lakes monday evening while a weak 30.0 
inch trough descends over the lake from northern ontario. after the 
trough briefly deepens to 29.9 inches, a weak 30.0 inch ridge moves 
over the lake tuesday morning as a 29.7 inch clipper low forms over 
saskatchewan. the low weakens slightly to 29.8 inches tuesday 
evening as it approaches lake superior. by wednesday afternoon, the 
low will deepen to 29.6 inches south of james bay while a 30.5 inch 
high builds over the high plains. as the low departs to the east, 
the high shifts over the central plains thursday morning, moving 
south of the great lakes thursday evening.



lsz263-302100-
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-
1000 am est sun nov 30 2025

.rest of today...north winds 20 to 30 knots becoming northwest
15 to 25 knots by mid afternoon. a chance of snow showers. waves
5 to 8 feet occasionally to 10 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tonight...northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. a
slight chance of snow showers after midnight. waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.monday...west winds 20 to 30 knots becoming southwest to
30 knots with a few gale force gusts to 35 knots possible. a
slight chance of snow showers. waves building to 6 to 10 feet
occasionally to 13 feet. 
.monday night...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. a chance of snow showers. waves
subsiding to 2 to 4 feet. 
.tuesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 25 knots veering west
after midnight. snow showers likely after midnight. waves
building to 3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest gales to 35 knots. a chance of snow
showers. waves building to 4 to 8 feet occasionally to 10 feet. 
.thursday...west gales to 35 knots backing southwest. freezing
spray. a chance of snow showers. waves building to 6 to 10 feet
occasionally to 13 feet. 

$$