fzus63 kmqt 162101
glfls 
expires:202512170900;;700227

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue dec 16 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 29.0 inch low moving from far northeastern ontario to quebec, 
deepening to 28.9 inches this evening, brings troughing of 29.3 
inches over northern lake superior. weak ridging of 29.9 inches then 
returns to lake superior on wednesday before a 29.0 inch alberta 
clipper tracks from the canadian prairies to western lake superior 
on wednesday, weakening to 29.1 inches. on thursday the low tracks 
east over lake superior and upper michigan, reaching quebec by 
friday afternoon. a 30.0 inch ridge returns to the lake on friday 
via a 30.2 inch high over the lower mississippi valley and a 30.0 
inch high over northern ontario. another low pressure of around 29.5 
inches tracks near the upper great lakes on saturday. this is 
followed by a 30.3 inch high over the canadian prairie diving 
southeast into the great lakes, rising to 30.5 inches on sunday.



lsz162-170900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est tue dec 16 2025 /300 pm cst tue dec 16 2025/

...gale warning in effect until 1 am est /midnight cst/
wednesday...

.late this afternoon...southwest gales to 35 knots. waves 8 to
11 feet occasionally to 14 feet. 
.tonight...west gales to 40 knots veering northwest by midnight,
then diminishing to 15 to 25 knots late. waves subsiding to 2 to
4 feet. 
.wednesday...west winds 10 to 20 knots backing southwest by late
morning, then becoming south 15 to 25 knots by mid afternoon. a
slight chance of snow showers in the afternoon. waves subsiding
to calm to 2 feet, then building to 2 to 4 feet. 
.wednesday night...south winds 20 to 30 knots increasing to gales
to 35 knots by midnight, then becoming southwest 20 to 30 knots
late. rain showers, possibly mixed with snow. waves building to
4 to 8 feet occasionally to 10 feet. 
.thursday...southwest winds 20 to 30 knots becoming north gales
to 40 knots in the afternoon. rain showers likely in the morning.
snow showers. freezing spray in the afternoon. waves subsiding to
3 to 6 feet occasionally to 8 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.thursday night...north gales to 40 knots. heavy freezing spray
in the evening. a chance of snow showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.friday...north winds 10 to 20 knots veering southeast in the
afternoon. a chance of snow showers in the afternoon. waves
subsiding to calm to 2 feet. 
.friday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. snow showers likely in the
evening, then a chance of snow showers after midnight. waves
building to 3 to 6 feet occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots veering northwest. waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
1 to 3 feet. 
.sunday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 162101
glfls 
expires:202512170900;;700228

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue dec 16 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 29.0 inch low moving from far northeastern ontario to quebec, 
deepening to 28.9 inches this evening, brings troughing of 29.3 
inches over northern lake superior. weak ridging of 29.9 inches then 
returns to lake superior on wednesday before a 29.0 inch alberta 
clipper tracks from the canadian prairies to western lake superior 
on wednesday, weakening to 29.1 inches. on thursday the low tracks 
east over lake superior and upper michigan, reaching quebec by 
friday afternoon. a 30.0 inch ridge returns to the lake on friday 
via a 30.2 inch high over the lower mississippi valley and a 30.0 
inch high over northern ontario. another low pressure of around 29.5 
inches tracks near the upper great lakes on saturday. this is 
followed by a 30.3 inch high over the canadian prairie diving 
southeast into the great lakes, rising to 30.5 inches on sunday.



lsz263-170900-
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 tue dec 16 2025

...gale warning in effect until 4 am est wednesday...

.late this afternoon...southwest gales to 35 knots. waves 10 to
14 feet occasionally to 18 feet. 
.tonight...west gales to 40 knots veering northwest by midnight,
then diminishing to 20 to 30 knots late. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.wednesday...west winds 10 to 20 knots backing southwest by late
morning, then becoming south 15 to 25 knots by mid afternoon.
waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.wednesday night...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 rain showers in the evening. a chance of snow
showers. rain showers likely after midnight. waves subsiding to
3 to 5 feet occasionally to 7 feet, then building to 5 to 8 feet
occasionally to 10 feet. 
.thursday...south gales to 35 knots becoming north gales to
45 knots in the afternoon. rain showers likely in the morning.
snow showers. a slight chance of rain showers in the afternoon.
freezing spray in the afternoon. waves subsiding to 4 to 7 feet
occasionally to 9 feet, then building to 11 to 15 feet
occasionally to 19 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
a chance of snow showers. waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet. 
.friday...north winds 20 to 30 knots becoming southeast 10 to
20 knots in the afternoon. freezing spray in the morning. waves
subsiding to 1 to 3 feet. 
.friday night...south winds 20 to 30 knots. freezing spray. snow
showers likely in the evening. a chance of snow showers after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.saturday...west gales to 35 knots veering northwest. a chance of
snow showers. freezing spray. waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet. 

note, wave height forecasts are for ice free areas.

$$