fzus63 kmqt 202001
glfls 
expires:202603210800;;021783

open lake forecast for lake superior
national weather service marquette mi
400 pm edt fri mar 20 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 weak 29.9 inch high was building over lake superior this afternoon 
ahead of a 29.6 inch low over the northern rockies. this low will 
move just south of the lake on saturday. a cold front will move 
through saturday night with a 30.4 inch ridge building into the 
great lakes and northern plains by monday. a 29.8 inch clipper low 
tracking across northern ontario on tuesday briefly extends a 30.0 
inch trough over the lake. a 30.5 inch high quickly follows behind 
it for wednesday.



lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt fri mar 20 2026 /300 pm cdt fri mar 20 2026/

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

$$

fzus63 kmqt 202001
glfls 
expires:202603210800;;021784

open lake forecast for lake superior
national weather service marquette mi
400 pm edt fri mar 20 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 weak 29.9 inch high was building over lake superior this afternoon 
ahead of a 29.6 inch low over the northern rockies. this low will 
move just south of the lake on saturday. a cold front will move 
through saturday night with a 30.4 inch ridge building into the 
great lakes and northern plains by monday. a 29.8 inch clipper low 
tracking across northern ontario on tuesday briefly extends a 30.0 
inch trough over the lake. a 30.5 inch high quickly follows behind 
it for wednesday.



lsz263-210800-
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 fri mar 20 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots backing southeast after
midnight. a chance of snow and rain showers after midnight. waves
calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming east 15 to 25 knots
late. snow showers, possibly mixed with rain through early
afternoon, then a chance of rain showers, possibly mixed with
snow by mid afternoon. waves building to 2 to 4 feet. 
.saturday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots late. a chance of rain showers, possibly mixed
with snow. a slight chance of freezing rain after midnight. waves
building to 5 to 8 feet occasionally to 10 feet. 
.sunday...northeast winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. 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...northwest 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. waves building to 4 to 7 feet occasionally to
9 feet. 
.tuesday...west winds 20 to 30 knots becoming northeast 15 to
25 knots. 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, possibly
mixed with rain. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 

$$