fzus63 kmqt 212008 cca
glfls 
expires:202610220800;;956765

open lake forecast for lake superior...corrected
national weather service marquette mi
408 pm edt wed oct 21 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 weak 30.0 inch trough over the lake will move east tonight as 
another high pressure builds in from the west in its wake, becoming 
centered over northern ontario and 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 moves just north of lake 
winnipeg. the low then lifts northeast to hudson bay on sunday 
dragging a 30.2 inch trough across the lake. high pressure of at
least 30.6 inches over the canadian prairies on monday pushes ridging
of at least 30.4 inches over the upper great lakes early next week.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
408 pm edt wed oct 21 2026 /308 pm cdt wed oct 21 2026/

.late this afternoon...north winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...northeast winds less than 10 knots increasing to 5 to
15 knots after midnight, then diminishing to less than 10 knots
late. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. patchy fog. 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. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...south winds 15 to 25 knots. a chance of showers by
mid afternoon. waves building to 3 to 5 feet occasionally to
7 feet. 
.saturday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. a chance of showers. waves
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 15 knots veering north. waves subsiding
to calm to 2 feet. 
.monday...northeast winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 212008 cca
glfls 
expires:202610220800;;956766

open lake forecast for lake superior...corrected
national weather service marquette mi
408 pm edt wed oct 21 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 weak 30.0 inch trough over the lake will move east tonight as 
another high pressure builds in from the west in its wake, becoming 
centered over northern ontario and 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 moves just north of lake 
winnipeg. the low then lifts northeast to hudson bay on sunday 
dragging a 30.2 inch trough across the lake. high pressure of at
least 30.6 inches over the canadian prairies on monday pushes ridging
of at least 30.4 inches over the upper great lakes early next week.



lsz263-220800-
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-
408 pm edt wed oct 21 2026

.late this afternoon...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...northeast winds less than 10 knots increasing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots in the afternoon. patchy fog. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots veering south late.
waves calm to 2 feet. 
.friday...south winds 5 to 15 knots backing southeast by mid
afternoon. waves calm to 2 feet. 
.friday night...south winds 10 to 20 knots. waves building to
2 to 4 feet. 
.saturday...south winds 15 to 25 knots. waves building to 3 to
5 feet occasionally to 7 feet. 
.saturday night...southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. a chance of showers. waves
subsiding to 2 to 4 feet. 
.sunday...west winds 10 to 20 knots becoming north 5 to 15 knots.
waves subsiding to calm to 2 feet. 
.monday...northeast winds 5 to 15 knots. waves calm to 2 feet. 

$$