fzus63 kmqt 250800
glfls 
expires:202610252000;;149932

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun oct 25 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...

high pressure builds to 30.6 inches over the canadian prairies 
today, pushing ridging of 30.4 inches over lake superior this 
evening. high pressure becomes centered over northern ontario at 
30.5 inches on monday, shifting to the saint lawrence seaway on 
tuesday. a 29.7 inch low tracks from the northern plains tuesday 
night to the james bay at 29.6 inches by thursday morning, dragging 
a 29.9 inch trough across lake superior on wednesday. high pressure 
of 30.2 to 30.3 inches returns to the upper great lakes late 
thursday into friday.




lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun oct 25 2026 /300 am cdt sun oct 25 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...west winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon, then diminishing to 5 to 15 knots late. waves
building to 1 to 3 feet. 
.tonight...northwest winds 10 to 20 knots veering north after
midnight. waves subsiding to calm to 2 feet. 
.monday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. waves calm to 2 feet. 
.monday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of rain showers. waves building
to 2 to 4 feet. 
.tuesday...east winds 15 to 25 knots. rain showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.tuesday night...east winds 15 to 25 knots becoming south 10 to
20 knots after midnight. showers likely after midnight. waves
subsiding to 2 to 4 feet. 
.wednesday...southwest winds 20 to 30 knots veering west. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet. 
.thursday...west winds 5 to 15 knots veering northwest. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 250800
glfls 
expires:202610252000;;149933

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun oct 25 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...

high pressure builds to 30.6 inches over the canadian prairies 
today, pushing ridging of 30.4 inches over lake superior this 
evening. high pressure becomes centered over northern ontario at 
30.5 inches on monday, shifting to the saint lawrence seaway on 
tuesday. a 29.7 inch low tracks from the northern plains tuesday 
night to the james bay at 29.6 inches by thursday morning, dragging 
a 29.9 inch trough across lake superior on wednesday. high pressure 
of 30.2 to 30.3 inches returns to the upper great lakes late 
thursday into friday.




lsz263-252000-
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-
400 am edt sun oct 25 2026

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

$$