fzus63 kmqt 230201
glfls 
expires:202603230800;;141295

open lake forecast for lake superior
national weather service marquette mi
1000 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 by tuesday 
evening. another clipper low around 29.7 inches phases with a 
shortwave low lifting off of the northern rockies tuesday and 
tuesday night, bringing troughing of at least 29.8 inches back 
across lake superior by wednesday. a secondary 29.6 inch low moves 
over the upper great lakes wednesday night into thursday. this is 
followed by ridging of at least 30.4 inches on friday.



lsz162-230800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt sun mar 22 2026 /900 pm cdt sun mar 22 2026/

.rest of tonight...southwest winds 5 to 15 knots veering west
after midnight. waves 1 to 3 feet 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 230201
glfls 
expires:202603230800;;141296

open lake forecast for lake superior
national weather service marquette mi
1000 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 by tuesday 
evening. another clipper low around 29.7 inches phases with a 
shortwave low lifting off of the northern rockies tuesday and 
tuesday night, bringing troughing of at least 29.8 inches back 
across lake superior by wednesday. a secondary 29.6 inch low moves 
over the upper great lakes wednesday night into thursday. this is 
followed by ridging of at least 30.4 inches on 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-
1000 pm edt sun mar 22 2026

.rest of tonight...northwest winds less than 10 knots becoming
west 5 to 15 knots after midnight. a slight chance of snow
showers. waves 1 to 3 feet 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 6 feet occasionally to 8 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. 

$$