fzus63 kmqt 081401
glfls 
expires:202610082000;;739220

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu oct 8 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...

ridging steadily builds to 29.9 inches today as the 30.1 inch parent 
high digs from the northern plains into the mid-atlantic today and 
tonight. the parent high strengthens to 30.2 inches tonight, 
allowing ridging over lake superior to increase to 30.1 inches. a 
29.3 inch clipper over southern alberta on friday night splits and 
creates a 29.4 inch low over the northern plains and canadian 
prairies by saturday. this low is expected to bring a gradient of 
29.6 to 29.9 inch troughing back over lake superior on saturday, 
which flattens out to around 29.8 inch troughing by sunday as the 
low weakens to 29.7 inches near lake winnipeg by the end of the 
weekend. a subtle 29.7 inch shortwave low moves over the lake sunday 
night and remains through monday evening. an area of high pressure 
builds over the northern plains monday night into tuesday morning 
and is expected to move into the area tuesday afternoon.




lsz162-082000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt thu oct 8 2026 /901 am cdt thu oct 8 2026/

.rest of today...west winds 15 to 25 knots diminishing to 10 to
20 knots late. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots becoming southwest less than
10 knots late. waves calm to 2 feet. 
.friday...east winds less than 10 knots increasing to 10 to
20 knots. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots veering southeast after
midnight. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.saturday...south winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.saturday night...southwest winds 20 to 30 knots. waves building
to 3 to 6 feet occasionally to 8 feet. 
.sunday...southwest winds 10 to 20 knots becoming north 15 to
25 knots. showers likely. waves subsiding to calm to 2 feet, then
building to 2 to 4 feet. 
.monday...north winds 15 to 25 knots. a chance of showers. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 

$$

fzus63 kmqt 081401
glfls 
expires:202610082000;;739221

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu oct 8 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...

ridging steadily builds to 29.9 inches today as the 30.1 inch parent 
high digs from the northern plains into the mid-atlantic today and 
tonight. the parent high strengthens to 30.2 inches tonight, 
allowing ridging over lake superior to increase to 30.1 inches. a 
29.3 inch clipper over southern alberta on friday night splits and 
creates a 29.4 inch low over the northern plains and canadian 
prairies by saturday. this low is expected to bring a gradient of 
29.6 to 29.9 inch troughing back over lake superior on saturday, 
which flattens out to around 29.8 inch troughing by sunday as the 
low weakens to 29.7 inches near lake winnipeg by the end of the 
weekend. a subtle 29.7 inch shortwave low moves over the lake sunday 
night and remains through monday evening. an area of high pressure 
builds over the northern plains monday night into tuesday morning 
and is expected to move into the area tuesday afternoon.




lsz263-082000-
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 am edt thu oct 8 2026

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

$$