fzus63 kmqt 210800
glfls 
expires:202603212000;;047635

open lake forecast for lake superior
national weather service marquette mi
400 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...

weak high pressure of 30.0 inches over lake superior this morning 
will be replaced by a 29.7 inch trough today as a 29.6 inch low 
moves from northern minnesota this morning to lower michigan 
tonight. a cold front will cross the lake tonight, followed by a 
30.4 inch ridge building over the great lakes for sunday and monday. 
a 29.8 inch clipper low tracking across northern ontario briefly 
extends a 30.0 inch trough over the lake on tuesday. a 30.4 inch 
high quickly builds back in on wednesday.



lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sat mar 21 2026 /300 am cdt sat mar 21 2026/

.early this morning...east winds 5 to 15 knots. a slight chance
of rain and snow showers. waves calm to 2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon, then backing northeast late. snow showers likely
through early afternoon. a chance of rain showers. waves 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 4 to
7 feet occasionally to 9 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 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 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.tuesday...northeast winds 10 to 20 knots. waves subsiding to
calm to 2 feet, then 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 3 to 5 feet occasionally to 7 feet, then building to
5 to 8 feet occasionally to 10 feet. 

$$

fzus63 kmqt 210800
glfls 
expires:202603212000;;047636

open lake forecast for lake superior
national weather service marquette mi
400 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...

weak high pressure of 30.0 inches over lake superior this morning 
will be replaced by a 29.7 inch trough today as a 29.6 inch low 
moves from northern minnesota this morning to lower michigan 
tonight. a cold front will cross the lake tonight, followed by a 
30.4 inch ridge building over the great lakes for sunday and monday. 
a 29.8 inch clipper low tracking across northern ontario briefly 
extends a 30.0 inch trough over the lake on tuesday. a 30.4 inch 
high quickly builds back in on wednesday.



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-
400 am edt sat mar 21 2026

.early this morning...southeast winds 5 to 15 knots. a chance of
snow and rain showers. waves calm to 2 feet. 
.today...southeast winds 10 to 20 knots backing east in the
afternoon. rain and snow showers likely through early afternoon,
then a chance of snow and rain showers by mid afternoon. waves
building to 2 to 4 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 4 to 7 feet occasionally
to 9 feet. 
.tuesday...west winds 15 to 25 knots veering northeast. freezing
spray. waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 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 building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 

$$