fzus63 kmqt 150801
glfls 
expires:202510152000;;165852

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed oct 15 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...

30.4 inch high pressure over lake superior today gradually weakens 
to 30.1 inches as it shifts eastward across the great lakes through 
thursday evening. a deepening 29.3 inch low develops over the 
northern plains thursday night and and lifts near lake winnipeg at 
29.2 inches friday morning. this will send 29.5 inch troughing over 
lake superior friday into saturday as the low moves to hudson bay. a 
secondary low deepens to 29.3 inches near the straits of mackinac 
sunday morning and moves over james bay by sunday night. 29.8 inch 
ridging returns to lake superior on monday.



lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt wed oct 15 2025 /301 am cdt wed oct 15 2025/

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots veering southeast late. a
slight chance of rain after midnight. waves calm to 2 feet. 
.thursday...southeast winds 10 to 20 knots. a chance of rain
through early afternoon, then rain by mid afternoon. waves calm
to 2 feet. 
.thursday night...southeast winds 10 to 20 knots veering south
after midnight. rain likely through midnight, then a chance of
rain after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.friday...south 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. 
.friday night...southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. a chance of showers. waves
subsiding to 1 to 3 feet. 
.saturday...west winds 10 to 20 knots increasing to 15 to
25 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202510152000;;165853

open lake forecast for lake superior
national weather service marquette mi
401 am edt wed oct 15 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...

30.4 inch high pressure over lake superior today gradually weakens 
to 30.1 inches as it shifts eastward across the great lakes through 
thursday evening. a deepening 29.3 inch low develops over the 
northern plains thursday night and and lifts near lake winnipeg at 
29.2 inches friday morning. this will send 29.5 inch troughing over 
lake superior friday into saturday as the low moves to hudson bay. a 
secondary low deepens to 29.3 inches near the straits of mackinac 
sunday morning and moves over james bay by sunday night. 29.8 inch 
ridging returns to lake superior on monday.



lsz263-152000-
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 wed oct 15 2025

.early this morning...west winds less than 10 knots. waves calm
to 2 feet. 
.today...west winds less than 10 knots becoming southwest 5 to
15 knots late. waves calm to 2 feet. 
.tonight...southwest winds less than 10 knots becoming southeast
5 to 15 knots after midnight, then veering south late. waves calm
to 2 feet. 
.thursday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. a slight chance of rain through early
afternoon, then rain likely by mid afternoon. waves calm to
2 feet. 
.thursday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. rain through midnight, then a chance of
rain after midnight. waves building to 2 to 4 feet. 
.friday...south winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. a chance of showers. waves building to
3 to 5 feet occasionally to 7 feet. 
.friday night...southwest winds 15 to 25 knots. a chance of
showers. waves subsiding to 2 to 4 feet. 
.saturday...southwest winds 20 to 30 knots veering west. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.sunday...west gales to 35 knots diminishing to 15 to 25 knots.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 1 to 3 feet. 

$$