fzus63 kmqt 230901
glfls 
expires:202602232100;;111836

open lake forecast for lake superior
national weather service marquette mi
400 am est mon feb 23 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 30.9 inch high moving over northern ontario today gradually 
weakens troughing over lake superior, extending 30.7 inch ridging 
over the lake through this morning. the high weakens today and 
tonight before arriving at the ontario/quebec border at 30.2 inches 
tuesday morning. a deepening 29.5 inch low then moves across the 
northern plains tonight, eventually deepening to 29.3 inches as it 
moves through the upper great lakes late tuesday through wednesday 
morning. weak ridging then builds back over lake superior at around 
29.8 inches for wednesday night before the next clipper low 
approaches the lake from the northwest friday; expect troughing of 
29.4 inches to develop over lake superior friday evening before a 
30.6 inch high pressure over the canadian prairies brings 30.4 inch 
ridging over the lake by saturday evening.



lsz162-232100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est mon feb 23 2026 /300 am cst mon feb 23 2026/

...heavy freezing spray warning in effect until 7 am est /6 am
cst/ this morning...

.early this morning...north winds 10 to 20 knots. isolated snow
showers. waves 3 to 5 feet occasionally to 7 feet. 
.today...northeast winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then veering east by mid afternoon.
waves subsiding to 1 to 3 feet. 
.tonight...southeast winds 5 to 15 knots becoming south 10 to
20 knots by midnight, then increasing to 20 to 30 knots late. a
chance of snow. waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet. 
.tuesday...south winds 20 to 30 knots veering west by mid
afternoon. snow in the morning, then a chance of snow in the
afternoon. waves building to 4 to 7 feet occasionally to 9 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves building
to 4 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 15 to 25 knots becoming west 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots backing southwest
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 2 to 4 feet. 
.friday...southwest winds 20 to 30 knots becoming west gales to
35 knots. heavy freezing spray. waves building to 4 to 8 feet
occasionally to 10 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 230901
glfls 
expires:202602232100;;111837

open lake forecast for lake superior
national weather service marquette mi
400 am est mon feb 23 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 30.9 inch high moving over northern ontario today gradually 
weakens troughing over lake superior, extending 30.7 inch ridging 
over the lake through this morning. the high weakens today and 
tonight before arriving at the ontario/quebec border at 30.2 inches 
tuesday morning. a deepening 29.5 inch low then moves across the 
northern plains tonight, eventually deepening to 29.3 inches as it 
moves through the upper great lakes late tuesday through wednesday 
morning. weak ridging then builds back over lake superior at around 
29.8 inches for wednesday night before the next clipper low 
approaches the lake from the northwest friday; expect troughing of 
29.4 inches to develop over lake superior friday evening before a 
30.6 inch high pressure over the canadian prairies brings 30.4 inch 
ridging over the lake by saturday evening.



lsz263-232100-
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 feb 23 2026

...heavy freezing spray warning in effect until 1 pm est this
afternoon...

.early this morning...north winds 20 to 30 knots. heavy freezing
spray. isolated snow showers. waves 5 to 8 feet occasionally to
10 feet. 
.today...north winds 15 to 25 knots becoming northeast 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. heavy freezing spray in the morning. isolated snow
showers in the morning. waves subsiding to 1 to 3 feet. 
.tonight...southeast winds 5 to 15 knots becoming south 10 to
20 knots by midnight, then increasing to 20 to 30 knots late. a
slight chance of snow. waves subsiding to calm to 2 feet, then
building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...south winds 20 to 30 knots veering southwest by late
morning, then becoming west to 30 knots with a few gale force
gusts to 35 knots possible by mid afternoon. heavy freezing spray
in the morning. snow. waves building to 4 to 8 feet occasionally
to 10 feet. 
.tuesday night...northwest gales to 35 knots. heavy freezing
spray after midnight. waves building to 7 to 10 feet occasionally
to 13 feet, then subsiding to 5 to 8 feet occasionally to
10 feet. 
.wednesday...northwest winds 20 to 30 knots becoming west 10 to
20 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming
southwest less than 10 knots after midnight. waves subsiding to
calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots increasing to 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 20 to 30 knots becoming west gales to
35 knots. heavy freezing spray. waves building to 8 to 12 feet
occasionally to 15 feet. 

note, wave height forecasts are for ice free areas.

$$