fzus63 kmqt 150936 cca
glfls 
expires:202512152100;;618009

open lake forecast for lake superior...corrected
national weather service marquette mi
436 am est mon dec 15 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 29.9 inch trough moving over the lake today remains until this 
evening. this trough is then followed by a weak 30.0 inch ridge 
tonight before a stronger 29.2 inch trough crosses the lake on 
tuesday as the 29.0 inch parent low tracks across northern ontario. 
weak ridging of 29.9 inches then returns on wednesday before a 29.1 
inch clipper low traverses the lake on thursday. 30.1 inch high 
pressure ridging then builds back in on friday.



lsz162-152100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
436 am est mon dec 15 2025 /336 am cst mon dec 15 2025/

...gale warning in effect until 7 am est /6 am cst/ this
morning...
...gale watch in effect from tuesday morning through late tuesday
night...

.early this morning...west winds 20 to 30 knots with a few gale force
gusts up to 35 knots. freezing spray. a chance of snow showers. 
waves 5 to 8 feet occasionally to 10 feet. 
.today...west winds 15 to 25 knots becoming northwest 10 to
20 knots. a slight chance of snow showers in the morning. waves
subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots backing southwest by
midnight, then increasing to 15 to 25 knots late. waves building
to 3 to 5 feet occasionally to 7 feet. 
.tuesday...southwest gales to 40 knots. waves building to 9 to
12 feet occasionally to 15 feet. 
.tuesday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.wednesday night...south gales to 35 knots veering southwest
after midnight. a chance of rain showers, possibly mixed with
freezing rain in the evening. a chance of snow showers. rain
showers likely after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday...north gales to 45 knots. snow showers, possibly mixed
with rain and freezing rain likely. heavy freezing spray. waves
building to 9 to 12 feet occasionally to 15 feet, then subsiding
to 1 to 3 feet. 
.friday...south winds 20 to 30 knots increasing to gales to
35 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 5 to 8 feet occasionally to 10 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 150936 cca
glfls 
expires:202512152100;;618010

open lake forecast for lake superior...corrected
national weather service marquette mi
436 am est mon dec 15 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 29.9 inch trough moving over the lake today remains until this 
evening. this trough is then followed by a weak 30.0 inch ridge 
tonight before a stronger 29.2 inch trough crosses the lake on 
tuesday as the 29.0 inch parent low tracks across northern ontario. 
weak ridging of 29.9 inches then returns on wednesday before a 29.1 
inch clipper low traverses the lake on thursday. 30.1 inch high 
pressure ridging then builds back in on friday.



lsz263-152100-
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-
436 am est mon dec 15 2025

...gale warning in effect until 7 am est this morning...
...gale watch in effect from tuesday morning through late tuesday
night...

.early this morning...west winds 20 to 30 knots with a few gale force
gusts up to 35 knots. freezing spray. a chance of snow showers. 
waves 7 to 10 feet occasionally to 13 feet. 
.today...west winds 20 to 30 knots becoming northwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. freezing spray in the morning. a chance of snow
showers. waves subsiding to 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots by midnight, then increasing to 20 to 30 knots late. a
slight chance of snow showers after midnight. waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.tuesday...southwest gales to 40 knots. a slight chance of
drizzle in the morning. waves building to 10 to 14 feet
occasionally to 18 feet. 
.tuesday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. a slight chance of drizzle in the
evening. waves subsiding to 5 to 8 feet occasionally to 10 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 20 to
30 knots in the afternoon. waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet. 
.wednesday night...south gales to 40 knots. a chance of rain
showers, drizzle and freezing drizzle in the evening. a chance of
snow showers. rain showers likely after midnight. waves building
to 7 to 10 feet occasionally to 13 feet. 
.thursday...north storm force winds to 50 knots diminishing to
gales to 45 knots. snow showers, possibly mixed with rain and
freezing rain likely. heavy freezing spray. waves building to
12 to 17 feet occasionally to 21 feet, then subsiding to 3 to
6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots increasing to gales to
35 knots. a chance of snow showers. freezing spray. 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.

$$