fzus63 kmqt 202001
glfls 
expires:202609210800;;780774

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun sep 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...

this afternoon through monday, a 30.3 inch high builds to 30.4 
inches as it moves east over northern ontario. the high slowly 
builds to 30.5 inches as it shifts into quebec by midday tuesday, 
trailing a 30.4 inch ridge over lake superior. the high builds 
further to 30.6 inches by wednesday, remaining through wednesday 
night before weakening to 30.4 inches by thursday night. by late 
friday, the high weakens to 30.3 inches over the eastern great lakes 
basin as 29.5 inch low pressure develops over montana.




lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sun sep 20 2026 /301 pm cdt sun sep 20 2026/

.late this afternoon...east winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...east winds 10 to 20 knots increasing to 15 to 25 knots
late. waves building to 1 to 3 feet. 
.monday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 1 to 3 feet. 
.tuesday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing east. waves calm to
2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202609210800;;780775

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun sep 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...

this afternoon through monday, a 30.3 inch high builds to 30.4 
inches as it moves east over northern ontario. the high slowly 
builds to 30.5 inches as it shifts into quebec by midday tuesday, 
trailing a 30.4 inch ridge over lake superior. the high builds 
further to 30.6 inches by wednesday, remaining through wednesday 
night before weakening to 30.4 inches by thursday night. by late 
friday, the high weakens to 30.3 inches over the eastern great lakes 
basin as 29.5 inch low pressure develops over montana.




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-
401 pm edt sun sep 20 2026

.late this afternoon...northeast winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...northeast winds 15 to 25 knots becoming east 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...east winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 1 to 3 feet. 
.monday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 10 to 20 knots veering south
after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves calm
to 2 feet. 

$$