fzus63 kmqt 162001
glfls 
expires:202604170800;;482398

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu apr 16 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 
through tonight. 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.



lsz162-170800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt thu apr 16 2026 /300 pm cdt thu apr 16 2026/

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...northeast winds 10 to 20 knots. patchy fog. waves
building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots backing northeast in the
afternoon, then backing northwest late. patchy fog through early
afternoon. rain showers likely and a chance of thunderstorms by
mid afternoon. waves subsiding to 1 to 3 feet. 
.friday night...west winds 15 to 25 knots increasing to 20 to
30 knots late. rain showers likely and a slight chance of
thunderstorms through midnight, then a slight chance of rain
showers after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.saturday...west gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. a slight chance of snow showers. waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding 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 subsiding to 2 to 4 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.monday...south winds 10 to 20 knots becoming southwest 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.tuesday...west winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 162001
glfls 
expires:202604170800;;482399

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu apr 16 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 
through tonight. 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.



lsz263-170800-
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 pm edt thu apr 16 2026

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots veering southeast late.
patchy fog. waves building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots veering south late. patchy
fog through early afternoon. a chance of showers and
thunderstorms by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.friday night...west winds 20 to 30 knots. rain showers and a
chance of thunderstorms through midnight, then a slight chance of
rain showers, snow showers and sleet after midnight. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then 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. a slight chance of snow showers. waves
building to 8 to 11 feet occasionally to 14 feet. 
.saturday night...northwest gales to 35 knots. waves subsiding to
4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...northwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots becoming southwest 20 to
30 knots. waves building to 4 to 7 feet occasionally to 9 feet. 
.tuesday...west winds 15 to 25 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

$$