fzus63 kmqt 190801
glfls 
expires:202509192000;;237139

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri sep 19 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 shifts southeast over northern ontario today and 
strengthens to 30.4 inches on saturday over eastern ontario and 
western quebec. the 30.4 inch high will move to new england by 
sunday morning. this keeps 30.2 inch ridging over lake 
superior today, which weakens to 30.0 inches by saturday night. 
troughing then spreads over lake superior sunday into the beginning 
of next week as low pressure deepens over the canadian prairie to 
around 29.5 inches. high pressure then builds in from the north on 
tuesday, reaching 30.2 inches by wednesday.



lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt fri sep 19 2025 /301 am cdt fri sep 19 2025/

.early this morning...east winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms. waves 3 to 5 feet
occasionally to 7 feet. 
.today...east winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. a chance of showers and a slight chance of
thunderstorms. waves building to 5 to 8 feet occasionally to
10 feet. 
.tonight...east winds 20 to 30 knots diminishing to 10 to
20 knots late. a chance of showers and a slight chance of
thunderstorms. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.saturday...east winds 10 to 20 knots. a chance of showers
through early afternoon. a slight chance of thunderstorms.
showers likely by mid afternoon. waves subsiding to 1 to 3 feet. 
.saturday night...east winds 5 to 15 knots veering southeast
after midnight. a chance of showers and a slight chance of
thunderstorms. waves subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots backing southeast by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.sunday night...north winds 5 to 15 knots. waves calm to 2 feet. 
.monday...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...northeast winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202509192000;;237140

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri sep 19 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 shifts southeast over northern ontario today and 
strengthens to 30.4 inches on saturday over eastern ontario and 
western quebec. the 30.4 inch high will move to new england by 
sunday morning. this keeps 30.2 inch ridging over lake 
superior today, which weakens to 30.0 inches by saturday night. 
troughing then spreads over lake superior sunday into the beginning 
of next week as low pressure deepens over the canadian prairie to 
around 29.5 inches. high pressure then builds in from the north on 
tuesday, reaching 30.2 inches by wednesday.



lsz263-192000-
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 am edt fri sep 19 2025

.early this morning...east winds 10 to 20 knots. a slight chance
of showers and thunderstorms. waves 2 to 4 feet. 
.today...east winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. a chance of showers. waves building to 4 to
7 feet occasionally to 9 feet. 
.tonight...east winds 20 to 30 knots diminishing to 10 to
20 knots. a chance of showers and a slight chance of
thunderstorms. waves subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots veering southeast in the
afternoon. a chance of showers and a slight chance of
thunderstorms. waves building to 3 to 6 feet occasionally to
8 feet. 
.saturday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. a chance of showers and a slight
chance of thunderstorms. waves subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
subsiding to calm to 2 feet. 
.sunday night...east winds less than 10 knots backing north after
midnight. waves calm to 2 feet. 
.monday...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...northeast winds 5 to 15 knots veering east. waves calm
to 2 feet. 

$$