fzus63 kmqt 130803 cca
glfls 
expires:202609132000;;369805

open lake forecast for lake superior...corrected
national weather service marquette mi
403 am edt sun sep 13 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 into lake superior this morning and 
strengthens to 30.2 inches tonight into monday. a low around 29.3 
inches skirts by lake winnipeg into northern ontario monday night, 
bringing 29.7 inch troughing over lake superior. in its stead, 30.2 
inch high pressure ridging develops over the northern plains on 
tuesday, which strengthens to 30.4 inches as it cross the upper 
great lakes by wednesday. the high pressure ridging looks to remain 
through the rest of the workweek. 




lsz162-132000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
403 am edt sun sep 13 2026 /303 am cdt sun sep 13 2026/

...gale watch in effect from late monday night through tuesday
afternoon...

.early this morning...west winds 15 to 25 knots. waves 1 to
3 feet. 
.today...west winds 15 to 25 knots diminishing to 10 to 20 knots
late. waves building to 2 to 4 feet, then subsiding to calm to
2 feet. 
.tonight...northwest winds 5 to 15 knots diminishing to less than
10 knots late. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then becoming southeast 20 to 30 knots late. a
slight chance of showers and thunderstorms by mid afternoon.
waves calm to 2 feet. 
.monday night...south gales to 35 knots veering southwest after
midnight. showers and a slight chance of thunderstorms through
midnight, then a slight chance of showers after midnight. waves
building to 5 to 8 feet occasionally to 10 feet. 
.tuesday...west gales to 40 knots. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tuesday night...west winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 

$$

fzus63 kmqt 130803 cca
glfls 
expires:202609132000;;369806

open lake forecast for lake superior...corrected
national weather service marquette mi
403 am edt sun sep 13 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 into lake superior this morning and 
strengthens to 30.2 inches tonight into monday. a low around 29.3 
inches skirts by lake winnipeg into northern ontario monday night, 
bringing 29.7 inch troughing over lake superior. in its stead, 30.2 
inch high pressure ridging develops over the northern plains on 
tuesday, which strengthens to 30.4 inches as it cross the upper 
great lakes by wednesday. the high pressure ridging looks to remain 
through the rest of the workweek. 




lsz263-132000-
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-
403 am edt sun sep 13 2026

...gale watch in effect from monday evening through tuesday
evening...

.early this morning...west winds 15 to 25 knots. waves 2 to
4 feet. 
.today...west winds 20 to 30 knots. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then becoming southeast 20 to 30 knots late. a
slight chance of showers by mid afternoon. waves calm to 2 feet. 
.monday night...south gales to 35 knots becoming southwest gales
to 40 knots after midnight. showers and a slight chance of
thunderstorms through midnight, then a chance of showers after
midnight. waves building to 5 to 8 feet occasionally to 10 feet. 
.tuesday...west gales to 45 knots. waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.tuesday night...west winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots veering south. waves
subsiding to calm to 2 feet. 
.thursday...west winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$