fzus63 kmqt 290901
glfls 
expires:202512292100;;425975

open lake forecast for lake superior
national weather service marquette mi
400 am est mon dec 29 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...

28.9 inch low pressure currently analyzed over central lake huron 
moves into quebec today while further deepening to 28.8 inches. 
meanwhile, a strong high pressure of at least 30.6 inches is 
expanding across the great plains. a 29.7 inch trough dives 
southeast into the upper great lakes late tuesday. weak ridging of 
around 30.0 inches on wednesday will be followed up by additional 
29.6-29.7inch shortwaves skirting the region the rest of the work 
week.



lsz162-292100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est mon dec 29 2025 /300 am cst mon dec 29 2025/

...gale warning in effect through this evening...
...heavy freezing spray warning in effect through this evening...

.early this morning...north gales to 45 knots. heavy freezing
spray. waves 11 to 15 feet occasionally to 19 feet subsiding to
10 to 14 feet occasionally to 18 feet. 
.today...north gales to 40 knots becoming northwest gales to
35 knots. heavy freezing spray. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming west 10 to 20 knots late.
freezing spray in the evening. waves subsiding to calm to 2 feet.
.tuesday...west winds 10 to 20 knots. snow showers. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.tuesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a slight chance of snow showers.
waves building to 2 to 4 feet. 
.wednesday...northwest winds 20 to 30 knots. waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.wednesday night...northwest gales to 35 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.thursday...west gales to 35 knots. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.friday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 290901
glfls 
expires:202512292100;;425976

open lake forecast for lake superior
national weather service marquette mi
400 am est mon dec 29 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...

28.9 inch low pressure currently analyzed over central lake huron 
moves into quebec today while further deepening to 28.8 inches. 
meanwhile, a strong high pressure of at least 30.6 inches is 
expanding across the great plains. a 29.7 inch trough dives 
southeast into the upper great lakes late tuesday. weak ridging of 
around 30.0 inches on wednesday will be followed up by additional 
29.6-29.7inch shortwaves skirting the region the rest of the work 
week.



lsz263-292100-
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 am est mon dec 29 2025

...storm warning in effect through this evening...
...heavy freezing spray warning in effect through this evening...

.early this morning...north storm force winds to 55 knots. heavy
freezing spray. a slight chance of snow. waves 17 to 22 feet
occasionally to 28 feet. 
.today...north storm force winds to 55 knots diminishing to gales
to 45 knots by late morning, then becoming northwest gales to
40 knots by mid afternoon. a slight chance of snow in the
morning. heavy freezing spray. waves subsiding to 8 to 11 feet
occasionally to 14 feet. 
.tonight...northwest gales to 35 knots diminishing to 15 to
25 knots. freezing spray in the evening. waves subsiding to 2 to
4 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west 10 to
20 knots by late morning, then becoming northwest 15 to 25 knots
by mid afternoon. a chance of snow showers in the morning, then
snow showers in the afternoon. waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet. 
.tuesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. heavy freezing spray. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.wednesday...northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. heavy freezing spray. waves
subsiding to 4 to 8 feet occasionally to 10 feet. 
.wednesday night...northwest gales to 35 knots. heavy freezing
spray. waves building to 6 to 9 feet occasionally to 11 feet. 
.thursday...west gales to 35 knots. heavy freezing spray. waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet. 
.friday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. heavy freezing spray. waves subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$