fzus63 kmqt 180201
glfls 
expires:202509180800;;165537

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed sep 17 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 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt wed sep 17 2025 /901 pm cdt wed sep 17 2025/

.rest of tonight...northeast winds 5 to 15 knots becoming east
10 to 20 knots after midnight, then backing northeast late. a
slight chance of showers after midnight. waves calm to 2 feet
building to 1 to 3 feet. 
.thursday...northeast winds 15 to 25 knots veering east in the
afternoon. a slight chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.thursday night...east winds 15 to 25 knots. a slight chance of
showers. a slight chance of thunderstorms after midnight. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...east winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. a slight chance of thunderstorms through early
afternoon. a slight chance of showers. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots backing east by mid
afternoon. showers likely and a chance of thunderstorms. waves
calm to 2 feet. 
.saturday night...east winds 5 to 15 knots veering south after
midnight. a chance of showers and thunderstorms. waves calm to
2 feet. 
.sunday...south winds 5 to 15 knots veering southwest. a chance
of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming west 10 to 20 knots.
a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 180201
glfls 
expires:202509180800;;165538

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed sep 17 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 inch high over manitoba gradually shifts over northern 
ontario tonight through friday and strengthens to 30.4 inches on 
saturday over eastern ontario and quebec. the 30.4 inch high will 
move to new england by sunday morning. this brings 30.2 inch ridging 
back over lake superior thursday and friday, weakening to 30.0 
inches by the end of the day saturday. troughing then begins to 
spread over lake superior sunday into the beginning of next week as 
low pressure deepens over the canadian prairie to around 29.5 inches.



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 wed sep 17 2025

.rest of tonight...northeast winds 5 to 15 knots increasing to
10 to 20 knots late. waves calm to 2 feet building to 1 to
3 feet. 
.thursday...northeast winds 10 to 20 knots veering east in the
afternoon. a slight chance of showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.thursday night...east winds 10 to 20 knots. a slight chance of
showers. waves subsiding to 2 to 4 feet. 
.friday...east winds 15 to 25 knots. a slight chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. a slight chance of showers. waves
subsiding to calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots. a chance of showers.
waves building to 1 to 3 feet. 
.saturday night...south winds 5 to 15 knots. a chance of showers
and thunderstorms. waves subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers and
thunderstorms. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$