fzus63 kmqt 172101
glfls 
expires:202512180900;;757641

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz162-180900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est wed dec 17 2025 /300 pm cst wed dec 17 2025/

...gale warning in effect from thursday afternoon through late
thursday night...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757642

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz263-180900-
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 wed dec 17 2025

...gale warning in effect from thursday afternoon through friday
morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 10 to 20 knots. a slight
chance of snow showers. waves 2 to 4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
35 knots by midnight, then becoming southwest 20 to 30 knots
late. a chance of snow showers and freezing drizzle in the
evening. a chance of drizzle. a chance of rain showers after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.thursday...southwest winds 15 to 25 knots becoming north gales
to 40 knots. a chance of rain showers in the morning, then snow
showers, possibly mixed with rain in the afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
7 to 10 feet occasionally to 13 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
snow showers. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. 
.friday...north gales to 35 knots becoming southeast 10 to
20 knots in the afternoon. freezing spray in the morning. a
slight chance of snow showers. waves subsiding to 1 to 3 feet. 
.friday night...south winds 20 to 30 knots. a chance of snow
showers. freezing spray after midnight. waves building to 5 to
8 feet occasionally to 10 feet. 
.saturday...southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. a chance of snow showers. freezing
spray in the afternoon. waves building to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...west gales to 35 knots becoming northwest 20 to
30 knots after midnight. freezing spray. waves subsiding to 4 to
7 feet occasionally to 9 feet. 
.sunday...northwest winds 10 to 20 knots backing west. waves
subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots becoming southwest 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$