fzus63 kmqt 120201
glfls 
expires:202608120800;;030994

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue aug 11 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...


tonight, 29.6 inch low pressure over labrador low descends to the 
gulf of st lawrence and deepens to 29.5 inches while a plains low 
deepens to 29.7 inches, eroding the ridge over lake superior to 29.8 
inches. this pattern holds 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 eastern 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 to follow.




lsz162-120800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt tue aug 11 2026 /901 pm cdt tue aug 11 2026/

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

$$

fzus63 kmqt 120201
glfls 
expires:202608120800;;030995

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt tue aug 11 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...


tonight, 29.6 inch low pressure over labrador low descends to the 
gulf of st lawrence and deepens to 29.5 inches while a plains low 
deepens to 29.7 inches, eroding the ridge over lake superior to 29.8 
inches. this pattern holds 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 eastern 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 to follow.




lsz263-120800-
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 pm edt tue aug 11 2026

.rest of tonight...east winds less than 10 knots veering
southwest after midnight, then veering west late. waves calm to
2 feet. 
.wednesday...west winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing south late. waves calm to
2 feet. 
.wednesday night...east winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. a slight chance of showers
after midnight. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east by mid
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 increasing to 15 to 25 knots
by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 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. 

$$