fzus63 kmqt 081501
glfls 
expires:202512082100;;224017

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 29.4 inch troughing over lake superior into wednesday. 
the low will move into new england at 29.2 inches by thursday 
morning, allowing 30.5 inch high pressure to rebuild over the 
northern plains through friday and shift east towards the great 
lakes during the weekend.



lsz162-082100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est mon dec 8 2025 /900 am cst mon dec 8 2025/

.rest of today...southwest winds 10 to 20 knots increasing to
15 to 25 knots by mid afternoon. a slight chance of snow showers.
waves calm to 2 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 showers in the evening, then a chance of snow showers
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 15 to 25 knots becoming northeast
20 to 30 knots after midnight. snow showers likely in the
evening, then a chance of snow showers 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. freezing spray in the morning. a
chance of snow showers. 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. a chance of snow
showers. waves building to 1 to 3 feet. 
.friday...northwest gales to 35 knots. a chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 081501
glfls 
expires:202512082100;;224018

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 29.4 inch troughing over lake superior into wednesday. 
the low will move into new england at 29.2 inches by thursday 
morning, allowing 30.5 inch high pressure to rebuild over the 
northern plains through friday and shift east towards the great 
lakes during the weekend.



lsz263-082100-
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 mon dec 8 2025

.rest of today...southwest winds 5 to 15 knots increasing to
15 to 25 knots. a slight chance of snow showers. waves 1 to
3 feet building to 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 showers. 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 chance of snow showers. waves subsiding to calm to
2 feet. 
.tuesday night...northeast winds 15 to 25 knots increasing to
gales to 35 knots after 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
chance of snow showers. 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...northwest winds 10 to 20 knots increasing to 15 to
25 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.friday...northwest gales to 40 knots. freezing spray. a chance
of snow showers. waves building to 5 to 9 feet occasionally to
11 feet. 

note, wave height forecasts are for ice free areas.

$$