fzus63 kmqt 122101
glfls 
expires:202512130900;;468519

open lake forecast for lake superior
national weather service marquette mi
400 pm est fri dec 12 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 will move through lake superior this evening 
while a 30.7 inch high spreads across central canada and the 
northern plains. ridging will build to 30.7 inches over the western 
lake by sunday morning as the high moves into iowa. a 30.0 inch 
trough will move through the lake monday as the high settles into 
the south at 30.3 inches. a 30.1 inch ridge will move through lake 
superior monday night followed by a trough of at least 29.3 inches 
tuesday night into wednesday.



lsz162-130900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est fri dec 12 2025 /300 pm cst fri dec 12 2025/

...heavy freezing spray warning in effect through late saturday
night...

.late this afternoon...northwest winds to 30 knots with a few
gale force gusts to 35 knots possible. heavy freezing spray. a
chance of snow showers and a slight chance of freezing drizzle.
waves 5 to 8 feet occasionally to 10 feet. 
.tonight...northwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. heavy freezing spray. a slight chance of snow showers.
waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet. 
.saturday...northwest winds 20 to 30 knots. heavy freezing spray
in the morning. a chance of snow showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. a slight chance of freezing drizzle in the
evening. a slight chance of snow showers. waves subsiding to 1 to
3 feet. 
.sunday...northwest winds 10 to 20 knots backing southwest in the
afternoon. a slight chance of snow showers in the morning. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.sunday night...southwest gales to 35 knots. freezing spray after
midnight. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet. 
.monday...west winds 20 to 30 knots becoming northwest 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.monday night...north winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.tuesday...southwest gales to 35 knots veering west. waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 2 to 4 feet. 
.wednesday...south winds 10 to 20 knots increasing to gales to
40 knots. a chance of freezing drizzle and snow showers. 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.

$$

fzus63 kmqt 122101
glfls 
expires:202512130900;;468520

open lake forecast for lake superior
national weather service marquette mi
400 pm est fri dec 12 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 will move through lake superior this evening 
while a 30.7 inch high spreads across central canada and the 
northern plains. ridging will build to 30.7 inches over the western 
lake by sunday morning as the high moves into iowa. a 30.0 inch 
trough will move through the lake monday as the high settles into 
the south at 30.3 inches. a 30.1 inch ridge will move through lake 
superior monday night followed by a trough of at least 29.3 inches 
tuesday night into wednesday.



lsz263-130900-
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 fri dec 12 2025

...gale warning in effect until 1 am est saturday...
...heavy freezing spray warning in effect through sunday
morning...

.late this afternoon...northwest gales to 35 knots. freezing
spray. snow showers likely. waves 5 to 9 feet occasionally to
11 feet. 
.tonight...northwest gales to 35 knots diminishing to 20 to
30 knots late. heavy freezing spray. patchy fog after midnight. a
chance of snow showers. waves building to 6 to 10 feet
occasionally to 13 feet. 
.saturday...northwest winds 20 to 30 knots. patchy fog in the
morning. heavy freezing spray. snow showers likely. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.saturday night...northwest winds 20 to 30 knots. heavy freezing
spray. a chance of freezing drizzle in the evening. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 15 to 25 knots backing west in the
afternoon. a slight chance of snow showers. waves subsiding to
calm to 2 feet, then building to 1 to 3 feet. 
.sunday night...southwest gales to 40 knots. freezing spray after
midnight. a chance of snow showers after midnight. waves building
to 7 to 10 feet occasionally to 13 feet. 
.monday...west gales to 35 knots becoming northwest 15 to
25 knots in the afternoon. freezing spray in the morning. waves
subsiding to 2 to 4 feet. 
.monday night...north winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves subsiding to calm to 2 feet,
then building to 1 to 3 feet. 
.tuesday...southwest gales to 45 knots veering west. waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet. 
.wednesday...west winds 15 to 25 knots becoming south storm force
winds to 55 knots. a chance of freezing drizzle. snow showers
likely. waves subsiding to 1 to 3 feet, then building to 10 to
14 feet occasionally to 18 feet. 

note, wave height forecasts are for ice free areas.

$$