fzus63 kmqt 152001
glfls 
expires:202610160800;;156240

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 15 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...

a phased 29.6 inch low forms over lower michigan tonight before 
lifting into southern ontario at 29.5 inches friday morning. in its 
wake, a 30.8 inch high lifting off of the central rockies tonight 
weakens to 30.6 inches on friday as it moves east over the plains. 
as it does so, the aforementioned low deepens to 29.4 inches and 
heads towards the mouth of the st. lawrence river. the high then 
slides south of the great lakes at 30.5 inches by saturday night as 
a 29.2 inch alberta clipper moves through the canadian prairies 
towards hudson bay, deepening to 29.0 inches by the time it arrives 
on sunday. this low is projected to bring troughing of 29.9 inches 
over lake superior on sunday. as the low moves east over hudson bay 
and weakens with time sunday night into monday, expect high pressure 
ridging of 30.3 inches to return to the upper great lakes by late 
monday. the high pressure ridging strengthens to 30.4 inches over 
lake superior by tuesday as the high pressure center at 30.5 inches 
over northern ontario lifts towards james bay. 




lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt thu oct 15 2026 /301 pm cdt thu oct 15 2026/

...gale warning in effect from late tonight through friday
afternoon...

.late this afternoon...west winds 5 to 15 knots. rain. waves calm
to 2 feet. 
.tonight...northwest winds 5 to 15 knots becoming north 15 to
25 knots after midnight, then increasing to gales to 35 knots
late. a chance of rain. waves building to 6 to 9 feet
occasionally to 11 feet. 
.friday...north gales to 40 knots diminishing to 15 to 25 knots
late. waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...northwest winds 10 to 20 knots backing west after
midnight, then increasing to 20 to 30 knots late. waves subsiding
to calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.saturday...southwest gales to 35 knots. waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.saturday night...southwest gales to 35 knots. waves building to
7 to 10 feet occasionally to 13 feet. 
.sunday...southwest gales to 35 knots. waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.sunday night...southwest winds 20 to 30 knots becoming west 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots veering north. waves calm to
2 feet. 
.tuesday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 152001
glfls 
expires:202610160800;;156241

open lake forecast for lake superior
national weather service marquette mi
401 pm edt thu oct 15 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...

a phased 29.6 inch low forms over lower michigan tonight before 
lifting into southern ontario at 29.5 inches friday morning. in its 
wake, a 30.8 inch high lifting off of the central rockies tonight 
weakens to 30.6 inches on friday as it moves east over the plains. 
as it does so, the aforementioned low deepens to 29.4 inches and 
heads towards the mouth of the st. lawrence river. the high then 
slides south of the great lakes at 30.5 inches by saturday night as 
a 29.2 inch alberta clipper moves through the canadian prairies 
towards hudson bay, deepening to 29.0 inches by the time it arrives 
on sunday. this low is projected to bring troughing of 29.9 inches 
over lake superior on sunday. as the low moves east over hudson bay 
and weakens with time sunday night into monday, expect high pressure 
ridging of 30.3 inches to return to the upper great lakes by late 
monday. the high pressure ridging strengthens to 30.4 inches over 
lake superior by tuesday as the high pressure center at 30.5 inches 
over northern ontario lifts towards james bay. 




lsz263-160800-
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 pm edt thu oct 15 2026

...gale warning in effect from late tonight through friday
afternoon...

.late this afternoon...south winds 5 to 15 knots. rain. waves
calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots becoming north 20 to
30 knots after midnight, then increasing to gales to 40 knots
late. rain. waves building to 8 to 11 feet occasionally to
14 feet. 
.friday...north gales to 40 knots diminishing to 20 to 30 knots
late. a chance of rain showers through early afternoon. waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet. 
.friday night...northwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight, then increasing to 20 to 30 knots late.
waves subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...southwest gales to 35 knots. waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.saturday night...southwest gales to 40 knots. waves subsiding to
5 to 8 feet occasionally to 10 feet, then building to 8 to
11 feet occasionally to 14 feet. 
.sunday...southwest gales to 40 knots. waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.sunday night...southwest gales to 35 knots becoming west 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...west winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.tuesday...east winds 5 to 15 knots veering southeast. waves calm
to 2 feet. 

$$