fzus63 kmqt 131501
glfls 
expires:202512132100;;512634

open lake forecast for lake superior
national weather service marquette mi
1000 am est sat dec 13 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 over far northeastern ontario this morning moves to 
northern quebec by this afternoon. meanwhile, a 30.7 inch high 
spreads throughout central canada and into the northern plains 
today. ridging builds to 30.5 inches over the western lake by sunday 
morning as the high moves over iowa. a 29.9 inch trough moves 
through the lake monday morning as the high settles into the 
southeastern u.s. a 30.1 inch ridge then moves through lake superior 
monday night followed by a trough of at least 29.3 inches tuesday 
night. weak ridging of 29.9 inches returns over lake superior on 
wednesday before a 29.0 inch clipper low moves through on thursday.



lsz162-132100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est sat dec 13 2025 /900 am cst sat dec 13 2025/

...heavy freezing spray warning in effect through late tonight...

.rest of today...northwest winds 20 to 30 knots. heavy freezing
spray late in the morning. isolated snow showers. waves 4 to
8 feet occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. isolated snow showers. waves subsiding to 2 to
4 feet. 
.sunday...northwest winds 10 to 20 knots backing west by late
morning, then becoming southwest 15 to 25 knots by mid afternoon.
a slight chance of snow showers in the morning. waves subsiding
to calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.sunday night...southwest gales to 35 knots. freezing spray after
midnight. a slight chance of snow showers after midnight. waves
building to 5 to 9 feet occasionally to 11 feet. 
.monday...west winds 15 to 25 knots becoming northwest 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.tuesday...southwest gales to 35 knots veering west. waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots becoming south gales to
35 knots. rain and snow showers likely. 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.

$$

fzus63 kmqt 131501
glfls 
expires:202512132100;;512635

open lake forecast for lake superior
national weather service marquette mi
1000 am est sat dec 13 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 over far northeastern ontario this morning moves to 
northern quebec by this afternoon. meanwhile, a 30.7 inch high 
spreads throughout central canada and into the northern plains 
today. ridging builds to 30.5 inches over the western lake by sunday 
morning as the high moves over iowa. a 29.9 inch trough moves 
through the lake monday morning as the high settles into the 
southeastern u.s. a 30.1 inch ridge then moves through lake superior 
monday night followed by a trough of at least 29.3 inches tuesday 
night. weak ridging of 29.9 inches returns over lake superior on 
wednesday before a 29.0 inch clipper low moves through on thursday.



lsz263-132100-
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 sat dec 13 2025

...heavy freezing spray warning in effect through sunday
morning...

.rest of today...northwest winds 20 to 30 knots. heavy freezing
spray. numerous snow showers. waves 7 to 10 feet occasionally to
13 feet subsiding to 5 to 8 feet occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots veering north by
midnight, then becoming northwest 15 to 25 knots late. heavy
freezing spray. scattered snow showers. waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by late morning, then becoming southwest 15 to 25 knots
by mid afternoon. a chance of snow showers. waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.sunday night...southwest gales to 35 knots. freezing spray. a
chance of snow showers. waves building to 7 to 10 feet
occasionally to 13 feet. 
.monday...west winds 20 to 30 knots becoming northwest 10 to
20 knots in the afternoon. freezing spray in the morning. a
slight chance of snow showers in the morning. waves subsiding to
1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.tuesday...southwest gales to 40 knots veering west. waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet. 
.wednesday...west winds 10 to 20 knots becoming south gales to
40 knots. rain and snow showers likely. waves subsiding to 1 to
3 feet, then building to 7 to 10 feet occasionally to 13 feet. 

note, wave height forecasts are for ice free areas.

$$