fzus63 kmqt 222001
glfls 
expires:202603230800;;128418

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun mar 22 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 ridge builds to 30.4 inches over the lake tonight through monday. 
a clipper low around 29.9 inches tracks across northern ontario and 
briefly extends a 30.1 inch trough over lake superior tuesday 
morning. 30.3 inch ridging quickly builds back in on tuesday night 
and remains until wednesday morning. another clipper low around 29.7 
inches phases with a shortwave low lifting off of the northern 
rockies on wednesday, bringing troughing of at least 29.8 inches 
back across lake superior by thursday morning. this is followed by 
ridging of at least 30.4 inches friday.



lsz162-230800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sun mar 22 2026 /300 pm cdt sun mar 22 2026/

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

$$

fzus63 kmqt 222001
glfls 
expires:202603230800;;128419

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun mar 22 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 ridge builds to 30.4 inches over the lake tonight through monday. 
a clipper low around 29.9 inches tracks across northern ontario and 
briefly extends a 30.1 inch trough over lake superior tuesday 
morning. 30.3 inch ridging quickly builds back in on tuesday night 
and remains until wednesday morning. another clipper low around 29.7 
inches phases with a shortwave low lifting off of the northern 
rockies on wednesday, bringing troughing of at least 29.8 inches 
back across lake superior by thursday morning. this is followed by 
ridging of at least 30.4 inches friday.



lsz263-230800-
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 sun mar 22 2026

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

$$