fzus63 kmqt 171401
glfls 
expires:202609172000;;603413

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 17 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...

30.2 inch ridging over lake superior this morning increases to 30.4 
inches by tonight and friday morning as the parent high moves from 
the canadian prairies to northern ontario. while the high does 
weaken back down to 30.3 inches over quebec on saturday, 30.1 inch 
remnant ridging still remains over the lake. another high pressure 
digging down from manitoba brings 30.4 inch ridging back over lake 
superior sunday night into monday morning. the high intensifies to 
30.6 inches as it moves into quebec on tuesday, keeping 30.4 inch 
ridging overhead into the middle of next week. 




lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt thu sep 17 2026 /901 am cdt thu sep 17 2026/

.rest of today...west winds 5 to 15 knots backing southwest in
the afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then becoming east 10 to 20 knots late. waves building
to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
late. a slight chance of showers by mid afternoon. waves 1 to
3 feet. 
.friday night...east winds 10 to 20 knots. a chance of showers.
waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots backing northeast by mid
afternoon. a slight chance of showers through early afternoon.
waves building to 2 to 4 feet, then subsiding to calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast gales to 35 knots becoming east 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 

$$

fzus63 kmqt 171401
glfls 
expires:202609172000;;603414

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 17 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...

30.2 inch ridging over lake superior this morning increases to 30.4 
inches by tonight and friday morning as the parent high moves from 
the canadian prairies to northern ontario. while the high does 
weaken back down to 30.3 inches over quebec on saturday, 30.1 inch 
remnant ridging still remains over the lake. another high pressure 
digging down from manitoba brings 30.4 inch ridging back over lake 
superior sunday night into monday morning. the high intensifies to 
30.6 inches as it moves into quebec on tuesday, keeping 30.4 inch 
ridging overhead into the middle of next week. 




lsz263-172000-
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-
1001 am edt thu sep 17 2026

.rest of today...west winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northeast after
midnight, then veering east late. waves building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a slight chance of showers by mid afternoon. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. a chance of showers. waves subsiding to
calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots veering east. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
calm to 2 feet. 
.monday...east winds 15 to 25 knots veering southeast. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$