fzus63 kmqt 211401
glfls 
expires:202603212000;;059916

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat mar 21 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 clipper around 29.6 inches dives through the western great lakes 
into lower michigan the rest of today into this evening. the 
clipper's cold front passes over the lake tonight, followed by a 
30.4 inch ridge building over the great lakes for sunday and monday. 
another clipper low, this one 29.9 inches, tracks across northern 
ontario and briefly extends a 30.1 inch trough over lake superior 
tuesday morning. 30.4 inch ridging quickly builds back in on tuesday 
night and remains until wednesday morning, until another clipper low 
around 29.7 inches brings troughing of at least 29.9 inches back 
across lake superior by thursday.



lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sat mar 21 2026 /900 am cdt sat mar 21 2026/

.rest of today...east winds 10 to 20 knots backing northeast
late. a chance of rain showers. waves calm to 2 feet building to
1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of rain showers through
midnight. a slight chance of snow showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.sunday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming east 5 to 15 knots late.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday night...south winds 5 to 15 knots veering west after
midnight. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.monday night...south winds 10 to 20 knots veering southwest
after midnight. a chance of rain showers, possibly mixed with
snow. waves building to 1 to 3 feet, then subsiding to calm to
2 feet. 
.tuesday...northeast winds 10 to 20 knots. waves building to 3 to
6 feet occasionally to 8 feet. 
.wednesday...east winds 10 to 20 knots increasing to 15 to
25 knots. a chance of snow showers. rain showers likely. waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202603212000;;059917

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat mar 21 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 clipper around 29.6 inches dives through the western great lakes 
into lower michigan the rest of today into this evening. the 
clipper's cold front passes over the lake tonight, followed by a 
30.4 inch ridge building over the great lakes for sunday and monday. 
another clipper low, this one 29.9 inches, tracks across northern 
ontario and briefly extends a 30.1 inch trough over lake superior 
tuesday morning. 30.4 inch ridging quickly builds back in on tuesday 
night and remains until wednesday morning, until another clipper low 
around 29.7 inches brings troughing of at least 29.9 inches back 
across lake superior by thursday.



lsz263-212000-
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 am edt sat mar 21 2026

.rest of today...southeast winds 10 to 20 knots backing east in
the afternoon. rain showers likely with pockets of snow showers
by late morning, then a chance of rain showers, possibly mixed
with snow by mid afternoon. waves 1 to 3 feet building to 3 to
5 feet occasionally to 7 feet. 
.tonight...northeast winds 15 to 25 knots. a slight chance of
rain showers through midnight. a slight chance of snow showers.
waves building to 5 to 8 feet occasionally to 10 feet. 
.sunday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. freezing spray through early afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday night...northeast winds 5 to 15 knots backing west after
midnight. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.monday night...south winds 20 to 30 knots veering southwest
after midnight. a chance of rain showers, possibly mixed with
snow after midnight. waves building to 3 to 5 feet occasionally
to 7 feet, then subsiding to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots veering northeast. freezing
spray. waves subsiding to 1 to 3 feet, then building to 4 to
7 feet occasionally to 9 feet. 
.wednesday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. freezing spray. a chance of snow showers. a chance of
rain showers. waves subsiding to 2 to 4 feet, then building to
4 to 7 feet occasionally to 9 feet. 

$$