fzus63 kmqt 170801
glfls 
expires:202603172000;;832628

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue mar 17 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 20.1 ridge will move through lake superior today. a 29.7 inch 
trough over the canadian prairie wednesday morning will begin to 
push towards the lake on wednesday, weakening to 29.8 inches over 
northern ontario wednesday night. weak ridging of around 30.1 inches 
will build over the lake on thursday ahead of the next clipper low 
approaching the region on friday at around 29.7 inches.



lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt tue mar 17 2026 /300 am cdt tue mar 17 2026/

.early this morning...north winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.today...northwest winds 10 to 20 knots backing southwest in the
afternoon. waves subsiding to calm to 2 feet. 
.tonight...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. a chance of
snow showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.wednesday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. a slight chance of snow showers through early
afternoon. waves subsiding to 1 to 3 feet. 
.wednesday night...southwest winds 5 to 15 knots veering
northwest after midnight. a slight chance of rain showers,
possibly mixed with snow through midnight. waves subsiding to
calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. a chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday...southeast winds 10 to 20 knots becoming north 20 to
30 knots. waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202603172000;;832629

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue mar 17 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 20.1 ridge will move through lake superior today. a 29.7 inch 
trough over the canadian prairie wednesday morning will begin to 
push towards the lake on wednesday, weakening to 29.8 inches over 
northern ontario wednesday night. weak ridging of around 30.1 inches 
will build over the lake on thursday ahead of the next clipper low 
approaching the region on friday at around 29.7 inches.



lsz263-172000-
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 tue mar 17 2026

...heavy freezing spray warning in effect until 2 pm edt this
afternoon...

.early this morning...north winds 20 to 30 knots. heavy freezing
spray. isolated snow showers. waves 6 to 9 feet occasionally to
11 feet subsiding to 4 to 7 feet occasionally to 9 feet. 
.today...northwest winds 15 to 25 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. isolated
snow showers through early afternoon. waves subsiding to calm to
2 feet. 
.tonight...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a slight chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...southwest winds 10 to 20 knots. a slight chance of
snow showers through early afternoon. waves subsiding to 2 to
4 feet. 
.wednesday night...west winds 5 to 15 knots veering northwest
after midnight. a slight chance of rain and snow showers. waves
subsiding to calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. a chance of snow showers. waves
calm to 2 feet. 
.friday...northeast winds 10 to 20 knots becoming east 20 to
30 knots. a chance of snow showers, possibly mixed with rain.
waves building to 5 to 8 feet occasionally to 10 feet. 
.saturday...southeast winds 15 to 25 knots becoming north gales
to 35 knots. a chance of rain showers. waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 7 to 10 feet
occasionally to 13 feet. 

$$