fzus63 kmqt 272002
glfls 
expires:202510280800;;866893

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon oct 27 2025

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 30.3 to 30.4 inch ridge persists over lake superior through 
tuesday, extending from a 30.5 inch high centered over quebec. 
meanwhile, a 29.8 inch trough over the northern plains dissipates 
through tuesday as high pressure strengthens over the rockies and a 
29.8 inch low develops over the southern plains. by the end of the 
day wednesday, the low pressure will be at 29.7 inches over the 
southeastern u.s. while broad 30.3 inch high pressure extends over 
the plains, northern half of the great lakes basin, northern ontario 
and quebec. wednesday night through thursday, the high pressure 
dissipates while a 29.9 inch low moves southeast across the canadian 
prairie and the southeastern low lifts northeast along the atlantic 
coast. the 29.9 inch low phases with the deepening east coast low 
thursday night before it rapidly deepens to around 29.0 inches on 
friday, lifting over new england by saturday morning.



lsz162-280800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon oct 27 2025 /301 pm cdt mon oct 27 2025/

.late this afternoon...east winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...southeast winds 15 to 25 knots diminishing to 10 to
20 knots late. waves building to 2 to 4 feet. 
.tuesday...southeast winds 10 to 20 knots backing east late. a
slight chance of showers by mid afternoon. waves subsiding to
1 to 3 feet. 
.tuesday night...east winds 10 to 20 knots diminishing to 5 to
15 knots late. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots backing north
after midnight. waves calm to 2 feet. 
.thursday...north winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.friday...north winds 10 to 20 knots. a chance of rain showers.
waves building to 1 to 3 feet. 
.saturday...north winds 5 to 15 knots backing northwest. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 272002
glfls 
expires:202510280800;;866894

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon oct 27 2025

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 30.3 to 30.4 inch ridge persists over lake superior through 
tuesday, extending from a 30.5 inch high centered over quebec. 
meanwhile, a 29.8 inch trough over the northern plains dissipates 
through tuesday as high pressure strengthens over the rockies and a 
29.8 inch low develops over the southern plains. by the end of the 
day wednesday, the low pressure will be at 29.7 inches over the 
southeastern u.s. while broad 30.3 inch high pressure extends over 
the plains, northern half of the great lakes basin, northern ontario 
and quebec. wednesday night through thursday, the high pressure 
dissipates while a 29.9 inch low moves southeast across the canadian 
prairie and the southeastern low lifts northeast along the atlantic 
coast. the 29.9 inch low phases with the deepening east coast low 
thursday night before it rapidly deepens to around 29.0 inches on 
friday, lifting over new england by saturday morning.



lsz263-280800-
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-
401 pm edt mon oct 27 2025

.late this afternoon...southeast winds 10 to 20 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.tonight...southeast winds 10 to 20 knots. waves building to 3 to
5 feet occasionally to 7 feet. 
.tuesday...southeast winds 15 to 25 knots backing east late.
waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots diminishing to less
than 10 knots after midnight. waves calm to 2 feet. 
.thursday...north winds less than 10 knots backing northwest by
mid afternoon. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.friday...north winds 15 to 25 knots. a chance of rain showers.
waves building to 2 to 4 feet. 
.saturday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$