fzus63 kmqt 302101
glfls 
expires:202512010900;;784088

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 southern ontario this afternoon 
continues east towards the mouth of the st. lawrence river tonight. 
meanwhile, a 30.6 inch high pressure over the northern plains 
weakens slightly to 30.5 inches as it dives towards the chicago area 
late tonight. this high continues to weaken to 30.4 inches over the 
lower great lakes monday evening while a weak 30.0 inch trough 
descends over lake superior from northern ontario. as the trough 
deepens to 29.9 inches on tuesday, a 29.7 inch low dives through 
southern saskatchewan into the northern plains. the low weakens 
slightly to 29.8 inches tuesday evening as it approaches lake 
superior. by wednesday afternoon, the low deepens to 29.6 inches 
south of james bay while a 30.5 inch high builds over the high 
plains. the high shifts over the central plains thursday morning 
before moving between the great lakes and ohio river valley thursday 
evening. the high arrives over the mid-atlantic states on friday as 
troughing down to 29.7 inches develops over lake superior.



lsz162-010900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est sun nov 30 2025 /300 pm cst sun nov 30 2025/

.late this afternoon...northwest winds 15 to 25 knots. waves 2 to
4 feet. 
.tonight...northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then increasing to 15 to 25 knots late.
waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.monday...west winds 15 to 25 knots backing southwest by mid
afternoon. isolated snow showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.monday night...west winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. a slight chance of snow showers. waves
subsiding to 1 to 3 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. a slight chance of snow showers. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.tuesday night...southwest winds 15 to 25 knots veering west
after midnight. snow showers likely. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.wednesday...northwest winds 20 to 30 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots. waves
subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 25 knots becoming southwest 20 to
30 knots. a chance of snow showers. freezing spray. waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet. 
.friday...west winds 10 to 20 knots veering northwest. a chance
of snow showers. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 302101
glfls 
expires:202512010900;;784089

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 southern ontario this afternoon 
continues east towards the mouth of the st. lawrence river tonight. 
meanwhile, a 30.6 inch high pressure over the northern plains 
weakens slightly to 30.5 inches as it dives towards the chicago area 
late tonight. this high continues to weaken to 30.4 inches over the 
lower great lakes monday evening while a weak 30.0 inch trough 
descends over lake superior from northern ontario. as the trough 
deepens to 29.9 inches on tuesday, a 29.7 inch low dives through 
southern saskatchewan into the northern plains. the low weakens 
slightly to 29.8 inches tuesday evening as it approaches lake 
superior. by wednesday afternoon, the low deepens to 29.6 inches 
south of james bay while a 30.5 inch high builds over the high 
plains. the high shifts over the central plains thursday morning 
before moving between the great lakes and ohio river valley thursday 
evening. the high arrives over the mid-atlantic states on friday as 
troughing down to 29.7 inches develops over lake superior.



lsz263-010900-
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-
400 pm est sun nov 30 2025

.late this afternoon...northwest winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...northwest winds 10 to 20 knots backing west by
midnight, then increasing to 15 to 25 knots late. isolated 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 backing southwest by mid
afternoon. isolated snow showers. waves building to 5 to 9 feet
occasionally to 11 feet. 
.monday night...west winds 15 to 25 knots diminishing to 10 to
20 knots by 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. a slight chance of snow showers. waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.tuesday night...southwest winds 20 to 30 knots veering west
after midnight. a chance of snow showers in the evening, then
snow showers likely after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.wednesday...northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. a chance of snow showers. freezing
spray in the afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.wednesday night...northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. freezing spray. a chance of snow
showers. waves subsiding to 4 to 7 feet occasionally to 9 feet. 
.thursday...west winds 20 to 30 knots backing southwest. freezing
spray. a chance of snow showers. waves building to 6 to 10 feet
occasionally to 13 feet. 
.friday...west winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of snow showers. waves subsiding to 2 to
4 feet. 

$$