fzus63 kmqt 310201
glfls 
expires:202510310800;;588367

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt thu oct 30 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...

29.9 inch troughing remains over lake superior tonight as a low 
deepens to 29.4 inches over the mid atlantic and a 29.8 inch low 
moves southeast from manitoba toward the upper great lakes. the mid 
atlantic low will continue deepening as it absorbs the other low, 
reaching 28.9 inches over maine by friday afternoon, with troughing 
deepening to 29.8 inches over lake superior. the eastern low deepens 
further to 28.7 inches by saturday morning over the canadian 
maritimes while 30.1 inch ridging builds over lake superior thanks 
to a 30.2 inch high stretching across the central plains. this high 
settles eastward into the midwest at 30.3 inches by sunday while a 
29.3 inch low moves over northern manitoba. this low will pull a 
29.6 inch trough across lake superior on monday.



lsz162-310800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt thu oct 30 2025 /901 pm cdt thu oct 30 2025/

.rest of tonight...north winds 5 to 15 knots veering northeast
late. a chance of showers after midnight. waves calm to 2 feet. 
.friday...northeast winds 10 to 20 knots increasing to 15 to
25 knots late. a chance of showers. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday night...northeast winds 10 to 20 knots backing north
after midnight. a chance of rain showers. waves subsiding to 1 to
3 feet. 
.saturday...north winds 5 to 15 knots backing west by mid
afternoon. a slight chance of rain showers through early
afternoon. waves subsiding to calm to 2 feet. 
.saturday night...west winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...southwest gales to 45 knots. a chance of rain showers
by mid afternoon. waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 7 to 10 feet occasionally to 13 feet. 
.sunday night...southwest gales to 35 knots becoming west 20 to
30 knots after midnight. a chance of showers. waves subsiding to
3 to 6 feet occasionally to 8 feet. 
.monday...west gales to 40 knots. waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots becoming southwest 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 310201
glfls 
expires:202510310800;;588368

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt thu oct 30 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...

29.9 inch troughing remains over lake superior tonight as a low 
deepens to 29.4 inches over the mid atlantic and a 29.8 inch low 
moves southeast from manitoba toward the upper great lakes. the mid 
atlantic low will continue deepening as it absorbs the other low, 
reaching 28.9 inches over maine by friday afternoon, with troughing 
deepening to 29.8 inches over lake superior. the eastern low deepens 
further to 28.7 inches by saturday morning over the canadian 
maritimes while 30.1 inch ridging builds over lake superior thanks 
to a 30.2 inch high stretching across the central plains. this high 
settles eastward into the midwest at 30.3 inches by sunday while a 
29.3 inch low moves over northern manitoba. this low will pull a 
29.6 inch trough across lake superior on monday.



lsz263-310800-
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 oct 30 2025

.rest of tonight...north winds 5 to 15 knots. a chance of showers
after midnight. waves calm to 2 feet. 
.friday...northeast winds 10 to 20 knots. rain showers likely
through early afternoon, then a chance of rain showers by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet. 
.friday night...north winds 10 to 20 knots. a slight chance of
rain showers. waves subsiding to 2 to 4 feet. 
.saturday...north winds 5 to 15 knots backing northwest by mid
afternoon. a slight chance of rain showers through early
afternoon. waves subsiding to calm to 2 feet. 
.saturday night...west winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...southwest gales to 45 knots. a chance of rain showers
by mid afternoon. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. 
.sunday night...southwest gales to 45 knots becoming west gales
to 40 knots after midnight. a chance of showers. waves subsiding
to 7 to 10 feet occasionally to 13 feet, then building to 8 to
11 feet occasionally to 14 feet. 
.monday...west gales to 45 knots. waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.tuesday...west gales to 35 knots diminishing to 15 to 25 knots.
waves subsiding to 1 to 3 feet. 

$$