fzus63 kmqt 220201
glfls 
expires:202610220800;;968650

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed oct 21 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...

30.3 inch high pressure becomes centered over northern ontario and 
the upper great lakes tonight into thursday morning. by friday 
afternoon, the high builds to 30.5 inches over the southern 
ontario/quebec line as a 29.4 inch low moves into eastern montana. 
by saturday afternoon, the high continues into new england as the 
low lifts north of lake winnipeg into northern manitoba, 
strengthening to 29.2 inches by saturday evening. the low then lifts 
northeast to hudson bay saturday night through sunday as it drags a 
30.2 inch trough across lake superior. high pressure of at least 
30.6 inches over the canadian prairies on monday pushes ridging of 
at least 30.4 inches over the upper great lakes early next week.




lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt wed oct 21 2026 /900 pm cdt wed oct 21 2026/

.rest of tonight...northeast winds 5 to 15 knots diminishing to
less than 10 knots late. patchy fog after midnight. waves calm to
2 feet. 
.thursday...east winds 5 to 15 knots. patchy fog through early
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves building to 2 to 4 feet. 
.saturday...south winds 15 to 25 knots. a chance of showers by
mid afternoon. waves building to 3 to 5 feet occasionally to
7 feet. 
.saturday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a chance of showers. waves
subsiding to calm to 2 feet. 
.sunday...west winds 5 to 15 knots veering north. waves calm to
2 feet. 
.monday...northeast winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 220201
glfls 
expires:202610220800;;968651

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed oct 21 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...

30.3 inch high pressure becomes centered over northern ontario and 
the upper great lakes tonight into thursday morning. by friday 
afternoon, the high builds to 30.5 inches over the southern 
ontario/quebec line as a 29.4 inch low moves into eastern montana. 
by saturday afternoon, the high continues into new england as the 
low lifts north of lake winnipeg into northern manitoba, 
strengthening to 29.2 inches by saturday evening. the low then lifts 
northeast to hudson bay saturday night through sunday as it drags a 
30.2 inch trough across lake superior. high pressure of at least 
30.6 inches over the canadian prairies on monday pushes ridging of 
at least 30.4 inches over the upper great lakes early next week.




lsz263-220800-
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 edt wed oct 21 2026

.rest of tonight...east winds less than 10 knots backing
northeast after midnight. patchy fog after midnight. waves calm
to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots in the afternoon. patchy fog through early afternoon.
waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots veering south late.
waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast by mid
afternoon. waves calm to 2 feet. 
.friday night...south winds 10 to 20 knots. waves building to
2 to 4 feet. 
.saturday...south winds 15 to 25 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.saturday night...southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. a chance of showers. waves
subsiding to 2 to 4 feet. 
.sunday...west winds 10 to 20 knots becoming north 5 to 15 knots.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.monday...northeast winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 

$$