fzus63 kmqt 202001
glfls 
expires:202610210800;;901856

open lake forecast for lake superior
national weather service marquette mi
400 pm edt tue oct 20 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 30.4 inch high pressure over quebec extending 30.2 inch ridging 
westwards over lake superior will continue to push east tonight as a 
30.0 inch trough moves towards the region. this trough will move 
over the lake on wednesday with another high pressure building over 
the upper great lakes by thursday morning. by friday afternoon, the 
high builds to 30.5 inches over the ontario/quebec line as a 29.4 
inch low moves into eastern montana. saturday afternoon, the high 
builds further to 30.6 inches over new england as the 29.4 inch low 
approaches lake winnipeg. the low will move east to the hudson bay 
on sunday dragging a 30.2 inch trough across the lake.




lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt tue oct 20 2026 /300 pm cdt tue oct 20 2026/

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering west in the
afternoon, then veering northeast late. waves calm to 2 feet. 
.wednesday night...northeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots veering east
after midnight. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.friday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...south winds 20 to 30 knots veering west. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet. 
.sunday...west winds 15 to 25 knots becoming northwest 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202610210800;;901857

open lake forecast for lake superior
national weather service marquette mi
400 pm edt tue oct 20 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 30.4 inch high pressure over quebec extending 30.2 inch ridging 
westwards over lake superior will continue to push east tonight as a 
30.0 inch trough moves towards the region. this trough will move 
over the lake on wednesday with another high pressure building over 
the upper great lakes by thursday morning. by friday afternoon, the 
high builds to 30.5 inches over the ontario/quebec line as a 29.4 
inch low moves into eastern montana. saturday afternoon, the high 
builds further to 30.6 inches over new england as the 29.4 inch low 
approaches lake winnipeg. the low will move east to the hudson bay 
on sunday dragging a 30.2 inch trough across the lake.




lsz263-210800-
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 pm edt tue oct 20 2026

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds 10 to 20 knots veering southwest after
midnight. waves building to 1 to 3 feet. 
.wednesday...southwest winds 5 to 15 knots veering west in the
afternoon, then veering northeast late. waves subsiding to calm
to 2 feet. 
.wednesday night...east winds 5 to 15 knots backing northeast
after midnight, then veering east late. waves calm to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...south gales to 35 knots becoming southwest 20 to
30 knots. a chance of showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday...west winds 15 to 25 knots becoming northwest 10 to
20 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 

$$