fzus63 kmqt 152001
glfls 
expires:202604160800;;424456

open lake forecast for lake superior
national weather service marquette mi
401 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 into lake superior for 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-
401 pm edt wed apr 15 2026 /301 pm cdt wed apr 15 2026/

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

.late this afternoon...northeast winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.tonight...northeast winds less than 10 knots 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 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 building to 2 to 4 feet. 
.friday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. rain showers likely through
midnight. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.saturday...west winds 20 to 30 knots. waves building to 3 to
5 feet occasionally to 7 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves building to 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 152001
glfls 
expires:202604160800;;424457

open lake forecast for lake superior
national weather service marquette mi
401 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 into lake superior for 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-
401 pm edt wed apr 15 2026

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

.late this afternoon...northeast winds less than 10 knots. patchy
dense fog. waves calm to 2 feet. 
.tonight...northeast winds less than 10 knots veering east after
midnight. 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 calm to 2 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 2 to 4 feet. 
.friday night...west winds 20 to 30 knots. rain showers through
midnight, then a chance of rain and snow showers after midnight.
waves building to 4 to 7 feet occasionally to 9 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
8 to 11 feet occasionally to 14 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots increasing to 20 to
30 knots. waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet. 

$$