fzus63 kmqt 220801
glfls 
expires:202609222000;;860624

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue sep 22 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...

30.4 inch high pressure over the ontario-quebec border shifts east 
today and builds to 30.6 inches by wednesday morning. throughout 
today and wednesday, the high trails a 30.5 inch ridge over lake 
superior while mainly easterly surface winds persist. the quebec 
high begins to break down thursday morning, weakening to 30.4 inches 
by thursday night as light winds veer southerly. by late friday, the 
high weakens to 30.2 inches over the eastern great lakes basin as 
29.5 inch low pressure develops over montana. southerly flow 
persists through saturday as the high deteriorates further and the 
montana low pressure deepens and moves north toward the canadian 
prairies.




lsz162-222000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue sep 22 2026 /301 am cdt tue sep 22 2026/

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon, then becoming northeast 15 to 25 knots late. waves
building to 2 to 4 feet. 
.tonight...east winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering southeast late. waves subsiding to
calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. waves building
to 1 to 3 feet. 
.wednesday night...east winds 10 to 20 knots veering south after
midnight. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots becoming south less
than 10 knots after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots veering south. a
chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 220801
glfls 
expires:202609222000;;860625

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue sep 22 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...

30.4 inch high pressure over the ontario-quebec border shifts east 
today and builds to 30.6 inches by wednesday morning. throughout 
today and wednesday, the high trails a 30.5 inch ridge over lake 
superior while mainly easterly surface winds persist. the quebec 
high begins to break down thursday morning, weakening to 30.4 inches 
by thursday night as light winds veer southerly. by late friday, the 
high weakens to 30.2 inches over the eastern great lakes basin as 
29.5 inch low pressure develops over montana. southerly flow 
persists through saturday as the high deteriorates further and the 
montana low pressure deepens and moves north toward the canadian 
prairies.




lsz263-222000-
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 am edt tue sep 22 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. waves building to 1 to 3 feet. 
.tonight...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 backing east late.
waves calm to 2 feet. 
.wednesday night...southeast winds 10 to 20 knots veering south
after midnight. waves building to 1 to 3 feet, then subsiding to
calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing southeast 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 backing southeast. waves calm
to 2 feet. 
.saturday...southeast winds 5 to 15 knots becoming south 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$