fzus63 kmqt 190901
glfls 
expires:202601192100;;147909

open lake forecast for lake superior
national weather service marquette mi
400 am est mon jan 19 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 low of 29.6 inches over eastern lake superior drops south into the 
eastern u.p this morning before moving to quebec this afternoon 
while a high pressure of 30.6 inches is dropping south over the 
plains. this high builds weak ridging of 30.0 inches over much of 
lake superior today, which strengthens to 30.1 inches by tuesday 
morning as a very weak trough of 30.0 inches scoots through the 
lake. a 29.8 inch low then moves over lower michigan on wednesday 
ahead of a secondary 29.8 inch low moving into lake superior later 
in the day. as the lows phase and continue east wednesday night into 
thursday, a weak remnant trough of 30.0 inches extends over the 
lake. after that, a 31.0 inch high builds from the canadian prairies 
into the northern plains thursday night through friday. this high 
builds into the upper midwest friday night into saturday as it 
weakens to 30.7 inches.



lsz162-192100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est mon jan 19 2026 /300 am cst mon jan 19 2026/

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

.early this morning...northwest gales to 35 knots. heavy freezing
spray. a slight chance of snow showers. waves 6 to 9 feet
occasionally to 11 feet. 
.today...northwest winds 20 to 30 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. a chance of snow showers. waves subsiding
to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots. waves 2 to 4 feet. 
.tuesday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.wednesday...west winds 10 to 20 knots. a chance of snow showers.
waves building to 2 to 4 feet. 
.wednesday night...northwest winds 15 to 25 knots. waves 2 to
4 feet. 
.thursday...northwest winds 15 to 25 knots. waves subsiding to
calm to 2 feet. 
.friday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 190901
glfls 
expires:202601192100;;147910

open lake forecast for lake superior
national weather service marquette mi
400 am est mon jan 19 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 low of 29.6 inches over eastern lake superior drops south into the 
eastern u.p this morning before moving to quebec this afternoon 
while a high pressure of 30.6 inches is dropping south over the 
plains. this high builds weak ridging of 30.0 inches over much of 
lake superior today, which strengthens to 30.1 inches by tuesday 
morning as a very weak trough of 30.0 inches scoots through the 
lake. a 29.8 inch low then moves over lower michigan on wednesday 
ahead of a secondary 29.8 inch low moving into lake superior later 
in the day. as the lows phase and continue east wednesday night into 
thursday, a weak remnant trough of 30.0 inches extends over the 
lake. after that, a 31.0 inch high builds from the canadian prairies 
into the northern plains thursday night through friday. this high 
builds into the upper midwest friday night into saturday as it 
weakens to 30.7 inches.



lsz263-192100-
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 jan 19 2026

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

.early this morning...north gales to 35 knots. heavy freezing
spray. snow showers. waves 8 to 11 feet occasionally to 14 feet. 
.today...north winds 20 to 30 knots becoming northwest 15 to
25 knots by late morning, then increasing to 20 to 30 knots by
mid afternoon. heavy freezing spray. snow showers likely in the
morning. a chance of snow showers in the afternoon. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. heavy freezing spray. a chance of snow
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots. heavy freezing spray. a
slight chance of snow showers. 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. a slight chance of snow showers after
midnight. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots. a chance of snow showers.
waves subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. heavy freezing spray. waves
building to 3 to 6 feet occasionally to 8 feet. 
.thursday...northwest winds 20 to 30 knots. heavy freezing spray.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...northwest winds 15 to 25 knots. waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$