fzus63 kmqt 100839 cca
glfls 
expires:202609102000;;678883

open lake forecast for lake superior...corrected
national weather service marquette mi
439 am edt thu sep 10 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...

30.0 inch ridging builds over the lake today, allowing calmer 
conditions until friday morning. a trough averaging 29.5 inches 
tracks from the great plains north toward hudson bay by friday 
afternoon, bringing 29.8 inch troughing to the lake. a cold front 
and 29.7 inch trough passes through on saturday with ridging in its 
wake reaching 30.0 inches by sunday. this strengthens further to 
30.2 inches monday. 


lsz162-102000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
439 am edt thu sep 10 2026 /339 am cdt thu sep 10 2026/

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots backing south in the afternoon.
waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
waves building to 1 to 3 feet. 
.friday...southwest winds 20 to 30 knots backing south late. a
slight chance of showers and thunderstorms by mid afternoon.
waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.friday night...south winds 15 to 25 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves
subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west 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...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.sunday...west winds 10 to 20 knots becoming east 15 to 25 knots.
a chance of showers. waves building to 2 to 4 feet. 
.monday...east gales to 35 knots veering west. showers likely,
then a chance of showers. waves building to 5 to 9 feet
occasionally to 11 feet. 

$$

fzus63 kmqt 100839 cca
glfls 
expires:202609102000;;678884

open lake forecast for lake superior...corrected
national weather service marquette mi
439 am edt thu sep 10 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...

30.0 inch ridging builds over the lake today, allowing calmer 
conditions until friday morning. a trough averaging 29.5 inches 
tracks from the great plains north toward hudson bay by friday 
afternoon, bringing 29.8 inch troughing to the lake. a cold front 
and 29.7 inch trough passes through on saturday with ridging in its 
wake reaching 30.0 inches by sunday. this strengthens further to 
30.2 inches monday. 


lsz263-102000-
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-
439 am edt thu sep 10 2026

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet. 
.today...northwest winds 5 to 15 knots backing southwest in the
afternoon, then becoming south 10 to 20 knots late. waves
subsiding to calm to 2 feet. 
.tonight...south winds 5 to 15 knots increasing to 15 to 25 knots
after midnight, then becoming southwest 20 to 30 knots late.
waves building to 2 to 4 feet. 
.friday...southwest winds 20 to 30 knots. a slight chance of
showers by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet. 
.friday night...south winds 15 to 25 knots veering southwest
after midnight. showers and a chance of thunderstorms. waves
building to 3 to 6 feet occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.saturday night...west winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...west winds 10 to 20 knots becoming east 15 to 25 knots.
a chance of showers. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 
.monday...east gales to 35 knots becoming west gales to 40 knots.
showers likely. waves building to 7 to 10 feet occasionally to
13 feet. 

$$