fzus63 kmqt 180301
glfls 
expires:202601180900;;074372

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sat jan 17 2026

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 ridge builds over lake superior tonight ahead of an 
approaching clipper low. the low moves over the lake on sunday, 
deepening to 29.6 inches by sunday night. the low then moves to 
quebec on monday while a high pressure of 30.6 inches drops south 
over the plains. this builds ridging of 30.1 inches over much of 
lake superior on monday which weakens on tuesday. a low of at least 
29.9 inches then moves over lake superior on wednesday. as the low 
moves east on thursday a weak trough of 30.0 inches will extend over 
the lake off a 30.5 inch high building into the canadian prairies 
and northern plains.



lsz162-180900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est sat jan 17 2026 /900 pm cst sat jan 17 2026/

.rest of tonight...north winds 10 to 20 knots backing west late.
a chance of snow showers. waves 1 to 3 feet subsiding to calm to
2 feet. 
.sunday...southwest winds 10 to 20 knots veering west 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 building to 1 to 3 feet. 
.sunday night...north winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible by midnight,
then backing northwest late. heavy freezing spray. a slight
chance of snow showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.monday...northwest winds 20 to 30 knots backing west in the
afternoon. heavy freezing spray in the morning. a slight chance
of snow showers. waves subsiding to 2 to 4 feet. 
.monday night...west winds 15 to 25 knots. waves subsiding to
1 to 3 feet. 
.tuesday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves building to 2 to 4 feet. 
.tuesday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.wednesday...northwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.thursday...west winds 10 to 20 knots veering northwest. waves
subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 180301
glfls 
expires:202601180900;;074373

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sat jan 17 2026

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 ridge builds over lake superior tonight ahead of an 
approaching clipper low. the low moves over the lake on sunday, 
deepening to 29.6 inches by sunday night. the low then moves to 
quebec on monday while a high pressure of 30.6 inches drops south 
over the plains. this builds ridging of 30.1 inches over much of 
lake superior on monday which weakens on tuesday. a low of at least 
29.9 inches then moves over lake superior on wednesday. as the low 
moves east on thursday a weak trough of 30.0 inches will extend over 
the lake off a 30.5 inch high building into the canadian prairies 
and northern plains.



lsz263-180900-
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-
1000 pm est sat jan 17 2026

...gale watch in effect from sunday evening through monday
morning...

.rest of tonight...north winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then increasing to 10 to 20 knots late. a
chance of snow showers. waves 3 to 5 feet occasionally to 7 feet
subsiding to 1 to 3 feet. 
.sunday...southwest winds 10 to 20 knots veering west by mid
afternoon. a chance of snow showers in the morning, then snow
showers in the afternoon. waves building to 2 to 4 feet. 
.sunday night...north winds 20 to 30 knots increasing to gales to
35 knots by midnight. heavy freezing spray. a chance of snow
showers. waves building to 9 to 12 feet occasionally to 15 feet. 
.monday...northwest gales to 35 knots diminishing to 15 to
25 knots in the afternoon. heavy freezing spray. 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. 
.monday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. a slight chance of snow showers in
the evening. heavy freezing spray. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots. heavy freezing spray in the
morning. waves 3 to 6 feet occasionally to 8 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...northwest winds 15 to 25 knots. waves subsiding to
2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$