fzus63 kmqt 250801
glfls 
expires:202605252000;;612089

open lake forecast for lake superior
national weather service marquette mi
400 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 forms today over the lower great lakes as a 29.7 
inch low moves from manitoba to northern ontario. by tuesday night, 
a 30.2 inch high over the western shores of hudson bay will extend 
weak ridging over lake superior with 29.5 inch troughing forming in 
the lee of the northern us rockies. pressure rises to 30.3 inches 
over the lake through mid week as the high shifts southeast over 
northern ontario on wednesday while low pressure over the west 
weakens through thursday. by friday morning, the high will weaken to 
30.1 inches as it moves to the southern great lakes while a wewak 
30.0 inch trough will be over northern ontario.



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

.early this morning...southwest winds less than 10 knots. waves
calm to 2 feet. 
.today...south winds 5 to 15 knots veering southwest in the
afternoon. a slight chance of showers and thunderstorms by mid
afternoon. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering west after
midnight. 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 250801
glfls 
expires:202605252000;;612090

open lake forecast for lake superior
national weather service marquette mi
400 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 forms today over the lower great lakes as a 29.7 
inch low moves from manitoba to northern ontario. by tuesday night, 
a 30.2 inch high over the western shores of hudson bay will extend 
weak ridging over lake superior with 29.5 inch troughing forming in 
the lee of the northern us rockies. pressure rises to 30.3 inches 
over the lake through mid week as the high shifts southeast over 
northern ontario on wednesday while low pressure over the west 
weakens through thursday. by friday morning, the high will weaken to 
30.1 inches as it moves to the southern great lakes while a wewak 
30.0 inch trough will be over northern ontario.



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 mon may 25 2026

.early this morning...southwest winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...south winds 5 to 15 knots veering southwest in the
afternoon. patchy dense fog through early afternoon. waves calm
to 2 feet. 
.tonight...southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
a slight chance of showers and thunderstorms through midnight.
waves building to 1 to 3 feet, then subsiding to 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. 

$$