fzus63 kmqt 022101
glfls 
expires:202512030900;;899156

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue dec 2 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 trough is swinging eastward towards the lake this 
afternoon, extending south from a 29.5 inch low over hudson bay. the 
trough exits eastward wednesday morning. in its wake, a 30.5 inch 
high builds over the dakotas wednesday evening. as this high shifts 
into the lower midwest thursday, it will pass a 30.2 inch ridge over 
the lake. meanwhile, a 29.7 inch low will move over lake winnipeg 
before passing north of the lake overnight into friday at 29.6 
inches. friday night, another 29.7 inch trough will pass over the 
lake. over the weekend, lake superior will be between a 30.3 inch 
high over saskatchewan and a low of 29.6 inches over quebec, with 
the high approaching lake superior late in the weekend to early next 
week.



lsz162-030900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est tue dec 2 2025 /300 pm cst tue dec 2 2025/

.late this afternoon...southwest winds 15 to 25 knots. a slight
chance of snow showers. waves 4 to 7 feet occasionally to 9 feet.
.tonight...southwest winds 15 to 25 knots veering northwest late.
a chance of snow showers. waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...northwest winds 20 to 30 knots. freezing spray in
the afternoon. waves building to 5 to 8 feet occasionally to
10 feet. 
.wednesday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. heavy freezing spray in the evening. a
slight chance of snow showers. waves subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 25 knots becoming southwest gales to
35 knots in the afternoon. freezing spray in the afternoon. a
chance of snow showers in the afternoon. waves subsiding to 1 to
3 feet, then building to 4 to 7 feet occasionally to 9 feet. 
.thursday night...southwest gales to 40 knots becoming west gales
to 35 knots after midnight. freezing spray. snow showers in the
evening. a chance of snow showers after midnight. waves building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
5 feet occasionally to 7 feet. 
.friday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 
.friday night...west winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. waves 1 to 3 feet. 
.saturday...northwest winds 10 to 20 knots veering north. waves
subsiding to calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 022101
glfls 
expires:202512030900;;899157

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue dec 2 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 trough is swinging eastward towards the lake this 
afternoon, extending south from a 29.5 inch low over hudson bay. the 
trough exits eastward wednesday morning. in its wake, a 30.5 inch 
high builds over the dakotas wednesday evening. as this high shifts 
into the lower midwest thursday, it will pass a 30.2 inch ridge over 
the lake. meanwhile, a 29.7 inch low will move over lake winnipeg 
before passing north of the lake overnight into friday at 29.6 
inches. friday night, another 29.7 inch trough will pass over the 
lake. over the weekend, lake superior will be between a 30.3 inch 
high over saskatchewan and a low of 29.6 inches over quebec, with 
the high approaching lake superior late in the weekend to early next 
week.



lsz263-030900-
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 2 2025

...gale watch in effect from wednesday afternoon through late
wednesday night...

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

note, wave height forecasts are for ice free areas.

$$