fzus63 kmqt 121401
glfls 
expires:202608122000;;058902

open lake forecast for lake superior
national weather service marquette mi
1001 am edt wed aug 12 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...

this morning, weak 29.8 inch ridging over lake superior separates a 
29.5 inch low pressure over the gulf of st. lawrence and a plains 
low of 29.7 inches. this pattern holds, leading to calm open lake 
conditions, until thursday morning, when a 30.2 inch high over the 
canadian rockies begins to extend stronger ridging over lake 
superior before eventually becoming centered over the lake at 30.2 
inches friday afternoon. a 29.9 inch trough then moves over the 
western end of the lake saturday afternoon as the 30.2 inch high 
moves over the lower great lakes. this trough consolidates to a 29.8 
inch low as it passes over lake superior, reaching ontario by sunday 
afternoon, with 30.1 inch ridging over lake superior to follow.




lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt wed aug 12 2026 /901 am cdt wed aug 12 2026/

.rest of today...south winds less than 10 knots increasing to
5 to 15 knots in the afternoon. waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots backing north after
midnight. a slight chance of showers. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east late.
waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.friday night...northeast winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots backing north. a chance
of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots veering northwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 121401
glfls 
expires:202608122000;;058903

open lake forecast for lake superior
national weather service marquette mi
1001 am edt wed aug 12 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...

this morning, weak 29.8 inch ridging over lake superior separates a 
29.5 inch low pressure over the gulf of st. lawrence and a plains 
low of 29.7 inches. this pattern holds, leading to calm open lake 
conditions, until thursday morning, when a 30.2 inch high over the 
canadian rockies begins to extend stronger ridging over lake 
superior before eventually becoming centered over the lake at 30.2 
inches friday afternoon. a 29.9 inch trough then moves over the 
western end of the lake saturday afternoon as the 30.2 inch high 
moves over the lower great lakes. this trough consolidates to a 29.8 
inch low as it passes over lake superior, reaching ontario by sunday 
afternoon, with 30.1 inch ridging over lake superior to follow.




lsz263-122000-
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-
1001 am edt wed aug 12 2026

.rest of today...northwest winds less than 10 knots backing
southwest late. waves calm to 2 feet. 
.tonight...west winds less than 10 knots veering north after
midnight. a slight chance of showers after midnight. waves calm
to 2 feet. 
.thursday...northeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.thursday night...northeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots increasing to 15 to
25 knots by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northwest. a chance
of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$