fzus63 kmqt 082101
glfls 
expires:202512090900;;238735

open lake forecast for lake superior
national weather service marquette mi
400 pm est mon dec 8 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 30.4 inch high over the great lakes today will shift east to 
upstate new york this evening as a 29.8 inch low over the canadian 
prairie deepens to 29.6 inches while moving over lake superior by 
tuesday morning. a stronger 29.3 inch low moving out of the canadian 
rockies will cross lake michigan at 29.2 inches tuesday night, 
resulting in 29.5 inch troughing over lake superior into wednesday. 
this low will move into new england at 29.2 inches by wednesday 
night, allowing 30.5 inch high pressure to rebuild over the northern 
plains through friday and shift east towards the great lakes during 
the weekend.



lsz162-090900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est mon dec 8 2025 /300 pm cst mon dec 8 2025/

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 082101
glfls 
expires:202512090900;;238736

open lake forecast for lake superior
national weather service marquette mi
400 pm est mon dec 8 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 30.4 inch high over the great lakes today will shift east to 
upstate new york this evening as a 29.8 inch low over the canadian 
prairie deepens to 29.6 inches while moving over lake superior by 
tuesday morning. a stronger 29.3 inch low moving out of the canadian 
rockies will cross lake michigan at 29.2 inches tuesday night, 
resulting in 29.5 inch troughing over lake superior into wednesday. 
this low will move into new england at 29.2 inches by wednesday 
night, allowing 30.5 inch high pressure to rebuild over the northern 
plains through friday and shift east towards the great lakes during 
the weekend.



lsz263-090900-
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 mon dec 8 2025

.late this afternoon...southwest winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet. 
.tonight...south winds 15 to 25 knots becoming southwest 10 to
20 knots by midnight, then veering west late. snow likely. waves
building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. a slight chance of snow showers. waves subsiding to
calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots becoming northeast
20 to 30 knots by midnight. a chance of snow showers. freezing
spray after midnight. waves building to 7 to 10 feet occasionally
to 13 feet. 
.wednesday...north gales to 35 knots becoming northwest 15 to
25 knots in the afternoon. freezing spray in the morning. a
slight chance of snow. waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.thursday...north winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet,
then building to 1 to 3 feet. 
.thursday night...northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday...northwest gales to 35 knots. freezing spray. a chance
of snow showers. waves building to 5 to 9 feet occasionally to
11 feet. 
.saturday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. heavy freezing spray. waves subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$