fzus63 kmqt 180201
glfls 
expires:202609180800;;631534

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

30.4 inch ridging continues to move over lake superior tonight into 
friday as a high presure center moves eastward across southern 
ontario. ridging weakens to 30.1 saturday before restrenghtening 
with the southward motion and strengthening of a high pressure 
center over central ontario sunday, reaching 30.3 inches early 
monday morning. 30.3 inch ridging remains over the area through 
wednesday next week.




lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt thu sep 17 2026 /901 pm cdt thu sep 17 2026/

.rest of tonight...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight, then veering east late. waves calm
to 2 feet building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. a slight chance of showers
by mid afternoon. waves 1 to 3 feet. 
.friday night...east winds 10 to 20 knots. waves subsiding to
calm to 2 feet, then building to 1 to 3 feet. 
.saturday...east winds 15 to 25 knots backing northeast by mid
afternoon. waves subsiding to calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots becoming east gales to
35 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...east winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...east winds 20 to 30 knots diminishing to 15 to
25 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.tuesday...east winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 180201
glfls 
expires:202609180800;;631535

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

30.4 inch ridging continues to move over lake superior tonight into 
friday as a high presure center moves eastward across southern 
ontario. ridging weakens to 30.1 saturday before restrenghtening 
with the southward motion and strengthening of a high pressure 
center over central ontario sunday, reaching 30.3 inches early 
monday morning. 30.3 inch ridging remains over the area through 
wednesday next week.




lsz263-180800-
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 pm edt thu sep 17 2026

.rest of tonight...north winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight, then veering east late. waves calm
to 2 feet building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots. waves 1 to 3 feet. 
.friday night...east winds 5 to 15 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 5 to 15 knots increasing to
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. waves 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. 
.tuesday...east winds 10 to 20 knots veering southeast. waves
calm to 2 feet. 

$$