fzus63 kmqt 201400
glfls 
expires:202610202000;;887454

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 over lake superior and northeastern ontario shifts 
east today. this high builds to 30.5 inches over western quebec this 
afternoon as a 29.9 inch low moves from northern manitoba into 
western hudson bay. wednesday morning, the high weakens slightly to 
30.4 inches but expands over much of southern quebec while the low 
deepens to 29.7 inches over eastern hudson bay. meanwhile, a 30.3 
inch high moves over the north dakota/manitoba/saskatchewan 
tripoint. with the low moving across northern quebec, the highs 
merge into a 30.3 inch high 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.




lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt tue oct 20 2026 /900 am cdt tue oct 20 2026/

.rest of today...southeast winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots veering southwest after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering west 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...east winds 5 to 15 knots. waves calm to 2 feet.
.friday...east winds 5 to 15 knots becoming south 15 to 25 knots.
waves building to 2 to 4 feet. 
.saturday...south winds 15 to 25 knots becoming southwest 20 to
30 knots. a chance of showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 201400
glfls 
expires:202610202000;;887455

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 over lake superior and northeastern ontario shifts 
east today. this high builds to 30.5 inches over western quebec this 
afternoon as a 29.9 inch low moves from northern manitoba into 
western hudson bay. wednesday morning, the high weakens slightly to 
30.4 inches but expands over much of southern quebec while the low 
deepens to 29.7 inches over eastern hudson bay. meanwhile, a 30.3 
inch high moves over the north dakota/manitoba/saskatchewan 
tripoint. with the low moving across northern quebec, the highs 
merge into a 30.3 inch high 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.




lsz263-202000-
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-
1000 am edt tue oct 20 2026

.rest of today...southeast winds 5 to 15 knots backing east late.
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 10 to 20 knots becoming west 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...northeast winds less than 10 knots becoming
east 5 to 15 knots after midnight. 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...east winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.friday...south winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 2 to 4 feet. 
.saturday...south winds 20 to 30 knots veering southwest. waves
building to 3 to 6 feet occasionally to 8 feet. 

$$