fzus63 kmqt 140922 cca
glfls 
expires:202512142100;;560498

open lake forecast for lake superior...corrected
national weather service marquette mi
422 am est sun dec 14 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...

ridging builds to 30.5 inches over the lake today as the 30.8 center 
continues diving towards the ohio river valley while weakening 
slightly to 30.7 inches. a 29.9 inch trough then moves across the 
lake monday as the aforementioned high settles over the southeastern 
u.s. a weak 30.0 inch ridge then crosses lake superior monday night, 
followed by a trough of at least 29.3 inches tuesday into tuesday 
night as a 29.1 inch low crosses northern ontario. weak ridging of 
29.9 inches returns over lake superior on wednesday before a 29.1 
inch clipper low approaches the lake wednesday night. the clipper 
then traverses the lake on thursday before lifting away and 
strengthening to 29.0 inches thursday night. ridging of at least 
30.1 inches then returns over lake superior on friday.



lsz162-142100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
422 am est sun dec 14 2025 /322 am cst sun dec 14 2025/

...heavy freezing spray warning in effect from this evening
through late tonight...
...gale warning in effect from this evening through monday
morning...

.early this morning...northwest winds 15 to 25 knots. isolated
snow showers. waves 2 to 4 feet. 
.today...northwest winds 10 to 20 knots backing west by late
morning, then becoming southwest 15 to 25 knots by mid afternoon.
a slight chance of snow showers in the morning. waves subsiding
to calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.tonight...southwest winds 20 to 30 knots increasing to gales to
35 knots by midnight, then veering west late. heavy freezing spray. 
a chance of snow showers. waves building to 7 to 10 feet occasionally
to 13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. 
.monday...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. 
.monday night...northwest winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. waves building to 1 to 3 feet. 
.tuesday...southwest gales to 40 knots. waves building to 7 to
11 feet occasionally to 14 feet. 
.tuesday night...west gales to 35 knots becoming northwest 20 to
30 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...south winds 10 to 20 knots increasing to gales to
40 knots. rain and snow showers. waves subsiding to calm to
2 feet, then building to 6 to 9 feet occasionally to 11 feet. 
.thursday...west gales to 45 knots veering northwest. freezing
spray. snow showers likely. waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 140922 cca
glfls 
expires:202512142100;;560499

open lake forecast for lake superior...corrected
national weather service marquette mi
422 am est sun dec 14 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...

ridging builds to 30.5 inches over the lake today as the 30.8 center 
continues diving towards the ohio river valley while weakening 
slightly to 30.7 inches. a 29.9 inch trough then moves across the 
lake monday as the aforementioned high settles over the southeastern 
u.s. a weak 30.0 inch ridge then crosses lake superior monday night, 
followed by a trough of at least 29.3 inches tuesday into tuesday 
night as a 29.1 inch low crosses northern ontario. weak ridging of 
29.9 inches returns over lake superior on wednesday before a 29.1 
inch clipper low approaches the lake wednesday night. the clipper 
then traverses the lake on thursday before lifting away and 
strengthening to 29.0 inches thursday night. ridging of at least 
30.1 inches then returns over lake superior on friday.



lsz263-142100-
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-
422 am est sun dec 14 2025

...heavy freezing spray warning in effect until 7 am est this
morning...
...gale warning in effect from this evening through monday
morning...

.early this morning...northwest winds 15 to 25 knots. heavy freezing
spray. isolated snow showers. waves 3 to 6 feet occasionally to 8 
feet. 
.today...northwest winds 10 to 20 knots backing west by late
morning, then becoming southwest 15 to 25 knots by mid afternoon.
a slight chance of snow showers. waves subsiding to 2 to 4 feet. 
.tonight...southwest winds 20 to 30 knots increasing to gales to
35 knots by midnight, then veering west late. freezing spray. a
chance of snow showers in the evening. snow showers after
midnight. waves building to 8 to 11 feet occasionally to 14 feet.
.monday...west winds 20 to 30 knots becoming northwest 10 to
20 knots. freezing spray in the morning. a chance of snow
showers. waves subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.tuesday...southwest gales to 40 knots. waves building to 10 to
14 feet occasionally to 18 feet. 
.tuesday night...west gales to 40 knots. waves subsiding to 4 to
7 feet occasionally to 9 feet. 
.wednesday...northwest winds 10 to 20 knots becoming south gales
to 40 knots. a chance of snow showers. rain showers likely. waves
subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.thursday...northwest storm force winds to 55 knots. snow
showers, possibly mixed with rain. heavy freezing spray. waves
building to 15 to 20 feet occasionally to 25 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$