fzus63 kmqt 251401
glfls 
expires:202605252000;;624931

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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... 

a 30.1 inch ridge over the lower great lakes today continues towards 
new england as a 29.6 inch low moves from manitoba into far northern 
ontario. the low drags a 29.8 inch trough over lake superior 
tonight. by tuesday night, a 30.4 inch high over the western shores 
of hudson bay extends weak ridging over lake superior as a 29.5 inch 
trough weakens in the lee of the northern us rockies. the parent 
high shifts south into lake superior at 30.3 inches on thursday as 
the low pressure troughing over the northern rockies strengthens to 
around 29.6 inches. by friday morning, the high weakens to around 
30.1 inches as it continues south towards chicago while a weak 30.0 
inch trough shifts through northern ontario towards the st. lawrence 
river.



lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon may 25 2026 /901 am cdt mon may 25 2026/

.rest of today...east winds 5 to 15 knots veering south late. a
slight chance of rain showers by mid afternoon. waves calm to
2 feet. 
.tonight...southwest winds 5 to 15 knots veering west late. a
slight chance of showers and thunderstorms through midnight.
waves calm to 2 feet. 
.tuesday...northwest winds 5 to 15 knots veering northeast in the
afternoon. waves calm to 2 feet. 
.tuesday night...northeast winds 5 to 15 knots. a chance of rain
showers. waves calm to 2 feet. 
.wednesday...northeast winds 10 to 20 knots. waves building to
2 to 4 feet. 
.wednesday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots backing north. waves
calm to 2 feet. 
.friday...east winds 5 to 15 knots backing northeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 251401
glfls 
expires:202605252000;;624932

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon may 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... 

a 30.1 inch ridge over the lower great lakes today continues towards 
new england as a 29.6 inch low moves from manitoba into far northern 
ontario. the low drags a 29.8 inch trough over lake superior 
tonight. by tuesday night, a 30.4 inch high over the western shores 
of hudson bay extends weak ridging over lake superior as a 29.5 inch 
trough weakens in the lee of the northern us rockies. the parent 
high shifts south into lake superior at 30.3 inches on thursday as 
the low pressure troughing over the northern rockies strengthens to 
around 29.6 inches. by friday morning, the high weakens to around 
30.1 inches as it continues south towards chicago while a weak 30.0 
inch trough shifts through northern ontario towards the st. lawrence 
river.



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-
1001 am edt mon may 25 2026

.rest of today...southwest winds less than 10 knots becoming
south 5 to 15 knots in the afternoon. a slight chance of rain
showers by mid afternoon. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering west late. a
slight chance of thunderstorms through midnight. a slight chance
of rain showers. waves calm to 2 feet. 
.tuesday...west winds 5 to 15 knots veering northeast in the
afternoon, then becoming east less than 10 knots late. waves calm
to 2 feet. 
.tuesday night...northeast winds less than 10 knots increasing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.wednesday...northeast winds 10 to 20 knots veering east by mid
afternoon. waves building to 2 to 4 feet. 
.wednesday night...east winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...east winds 5 to 15 knots backing north. waves calm to
2 feet. 
.friday...northeast winds 5 to 15 knots veering east. waves calm
to 2 feet. 

$$