fzus63 kmqt 112001
glfls 
expires:202608120800;;016337

open lake forecast for lake superior
national weather service marquette mi
401 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the 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-
401 pm edt tue aug 11 2026 /301 pm cdt tue aug 11 2026/

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.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 112001
glfls 
expires:202608120800;;016338

open lake forecast for lake superior
national weather service marquette mi
401 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the 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-
401 pm edt tue aug 11 2026

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots becoming southwest less than
10 knots 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. 

$$