fzus63 kmqt 160201
glfls 
expires:202604160800;;438781

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed apr 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...

weak ridging of around 29.8 inches persists over lake superior 
tonight through thursday and into friday, before troughing averaging 
29.5 inches moves across the lake friday evening and saturday 
morning. ridging builds over lake superior the remainder of saturday 
and throughout sunday, reaching about 30.3 inches monday morning. 
this gives way quickly to troughing monday evening as a low swings 
southeast through ontario toward james bay, decreasing to around 
29.6 by monday evening.



lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt wed apr 15 2026 /900 pm cdt wed apr 15 2026/

...dense fog advisory in effect until 11 am edt /10 am cdt/
thursday...

.rest of tonight...east winds less than 10 knots backing
northeast after midnight, then increasing to 5 to 15 knots late.
areas of dense fog. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots becoming east 10 to
20 knots late. areas of dense fog through early afternoon. waves
calm to 2 feet. 
.thursday night...northeast winds 10 to 20 knots. waves building
to 1 to 3 feet, then subsiding to calm to 2 feet. 
.friday...northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. rain showers likely and a chance of
thunderstorms by mid afternoon. waves subsiding to 1 to 3 feet. 
.friday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. rain showers likely and a slight
chance of thunderstorms through midnight. a slight chance of snow
showers. a slight chance of rain showers after midnight. waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.saturday...west winds 20 to 30 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves 3 to 6 feet occasionally to
8 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming west 10 to 20 knots.
waves building to 2 to 4 feet. 

$$

fzus63 kmqt 160201
glfls 
expires:202604160800;;438782

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed apr 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...

weak ridging of around 29.8 inches persists over lake superior 
tonight through thursday and into friday, before troughing averaging 
29.5 inches moves across the lake friday evening and saturday 
morning. ridging builds over lake superior the remainder of saturday 
and throughout sunday, reaching about 30.3 inches monday morning. 
this gives way quickly to troughing monday evening as a low swings 
southeast through ontario toward james bay, decreasing to around 
29.6 by monday evening.



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-
1000 pm edt wed apr 15 2026

...dense fog advisory in effect until 11 am edt thursday...

.rest of tonight...east winds less than 10 knots. areas of dense
fog. waves calm to 2 feet. 
.thursday...south winds less than 10 knots becoming southwest
5 to 15 knots in the afternoon, then backing east late. areas of
dense fog through early afternoon, then patchy fog by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots increasing to 10 to
20 knots late. waves building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. a chance of rain showers and a slight chance of
thunderstorms by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday night...west winds 20 to 30 knots. rain showers and a
slight chance of thunderstorms through midnight, then a chance of
rain and snow showers after midnight. waves building to 3 to
6 feet occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 6 to 9 feet
occasionally to 11 feet. 
.saturday night...northwest gales to 35 knots. waves building to
6 to 10 feet occasionally to 13 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots increasing to 20 to
30 knots. waves building to 4 to 7 feet occasionally to 9 feet. 

$$