fzus63 kmqt 151501
glfls 
expires:202512152100;;628540

open lake forecast for lake superior
national weather service marquette mi
1000 am est mon dec 15 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 29.9 inch trough moving over the lake today remains until this 
evening. this trough is then followed by a weak 30.0 inch ridge 
tonight. tuesday, a 29.2 inch trough crosses the lake as the 29.0 
inch parent low tracks across northern ontario. weak ridging of 29.9 
inches then returns on wednesday. wednesday evening through thursday 
morning, a 29.0 inch alberta clipper tracks from the canadian 
prairie to western lake superior, weakening to 29.2 inches as it 
progresses. the low crosses the lake thursday, with 30.2 inch 
ridging following on friday. another low pressure of around 29.5 
inches tracks near the upper great lakes saturday with ridging to 
follow late in the weekend.



lsz162-152100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est mon dec 15 2025 /900 am cst mon dec 15 2025/

...gale watch in effect from tuesday morning through late tuesday
night...

.rest of today...northwest winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots backing southwest by
midnight, then increasing to 15 to 25 knots late. waves building
to 3 to 5 feet occasionally to 7 feet. 
.tuesday...southwest gales to 40 knots. waves building to 9 to
12 feet occasionally to 15 feet. 
.tuesday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. a slight chance of drizzle, freezing
drizzle and snow showers in the afternoon. waves subsiding to
calm to 2 feet, then building to 2 to 4 feet. 
.wednesday night...south gales to 35 knots veering southwest
after midnight. a chance of rain showers, possibly mixed with
freezing rain in the evening. a chance of snow showers. rain
showers likely after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday...north gales to 45 knots. snow showers, possibly mixed
with rain and freezing rain likely. heavy freezing spray. waves
building to 9 to 12 feet occasionally to 15 feet, then subsiding
to 1 to 3 feet. 
.friday...south winds 20 to 30 knots increasing to gales to
35 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 5 to 8 feet occasionally to 10 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 151501
glfls 
expires:202512152100;;628541

open lake forecast for lake superior
national weather service marquette mi
1000 am est mon dec 15 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 29.9 inch trough moving over the lake today remains until this 
evening. this trough is then followed by a weak 30.0 inch ridge 
tonight. tuesday, a 29.2 inch trough crosses the lake as the 29.0 
inch parent low tracks across northern ontario. weak ridging of 29.9 
inches then returns on wednesday. wednesday evening through thursday 
morning, a 29.0 inch alberta clipper tracks from the canadian 
prairie to western lake superior, weakening to 29.2 inches as it 
progresses. the low crosses the lake thursday, with 30.2 inch 
ridging following on friday. another low pressure of around 29.5 
inches tracks near the upper great lakes saturday with ridging to 
follow late in the weekend.



lsz263-152100-
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 15 2025

...gale watch in effect from tuesday morning through late tuesday
night...

.rest of today...northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. a chance of snow showers. waves
5 to 8 feet occasionally to 10 feet subsiding to 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots by midnight, then increasing to 20 to 30 knots late. a
slight chance of snow showers after midnight. waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.tuesday...southwest gales to 40 knots. a slight chance of
drizzle in the morning. waves building to 10 to 14 feet
occasionally to 18 feet. 
.tuesday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. a slight chance of drizzle in the
evening. waves subsiding to 5 to 8 feet occasionally to 10 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 20 to
30 knots in the afternoon. waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet. 
.wednesday night...south gales to 40 knots. a chance of rain
showers, drizzle and freezing drizzle in the evening. a chance of
snow showers. rain showers likely after midnight. waves building
to 7 to 10 feet occasionally to 13 feet. 
.thursday...north storm force winds to 50 knots diminishing to
gales to 45 knots. snow showers, possibly mixed with rain and
freezing rain likely. heavy freezing spray. waves building to
12 to 17 feet occasionally to 21 feet, then subsiding to 3 to
6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots increasing to gales to
35 knots. a chance of snow showers. freezing spray. waves
subsiding to calm to 2 feet, then building to 6 to 9 feet
occasionally to 11 feet. 

note, wave height forecasts are for ice free areas.

$$