fzus63 kmqt 210800
glfls 
expires:202610212000;;928361

open lake forecast for lake superior
national weather service marquette mi
400 am 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 30.4 inch high pressure over quebec extending 30.1 inch ridging 
westwards over lake superior weakens to 30.2 inches today over new 
england and the lower great lakes. meanwhile, a weak 30.0 inch 
trough moves over the lake. 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.




lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt wed oct 21 2026 /300 am cdt wed oct 21 2026/

.early this morning...southwest winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.today...southwest winds 5 to 15 knots veering west in the
afternoon, then veering northeast late. a chance of showers
through early afternoon. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots backing northeast late.
waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots veering east
after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...south winds 15 to 25 knots becoming west 10 to
20 knots. a chance of showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet. 
.sunday...west winds 10 to 20 knots veering north. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210800
glfls 
expires:202610212000;;928362

open lake forecast for lake superior
national weather service marquette mi
400 am 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 30.4 inch high pressure over quebec extending 30.1 inch ridging 
westwards over lake superior weakens to 30.2 inches today over new 
england and the lower great lakes. meanwhile, a weak 30.0 inch 
trough moves over the lake. 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.




lsz263-212000-
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 am edt wed oct 21 2026

.early this morning...southwest winds 10 to 20 knots. a chance of
showers. waves 1 to 3 feet. 
.today...southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then veering north late. a chance of
showers through early afternoon. waves subsiding to calm to
2 feet. 
.tonight...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots late. 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 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 veering west. a chance of
showers. waves building to 3 to 6 feet occasionally to 8 feet,
then 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. 

$$