fzus63 kmqt 280201
glfls 
expires:202603280800;;407717

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri mar 27 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...

30.6 inch high pressure slides from the northern plains into the 
ohio river valley through saturday. the high weakens to 30.5 inches 
as it continues eastward, moving offshore into the atlantic sunday. 
upstream on sunday, a 29.6 inch low will organize over the central 
plains, lifting a 30.0 inch trough over lake superior by sunday 
night. this trough will linger over the great lakes, followed by the 
low tuesday. as the low lifts into canada, 30.3 inch high pressure 
builds over the northern plains, gradually building pressure over 
the upper great lakes by wednesday as the high presses east through 
ontario near 30.5 inches.



lsz162-280800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt fri mar 27 2026 /900 pm cdt fri mar 27 2026/

.rest of tonight...northwest winds 15 to 25 knots backing west
after midnight, then diminishing to 10 to 20 knots late. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.saturday...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 10 to 20 knots
late. a slight chance of snow showers. waves subsiding to calm to
2 feet, then building to 2 to 4 feet. 
.saturday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then increasing to 10 to 20 knots
late. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.monday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves building to 3 to 5 feet occasionally to
7 feet. 
.monday night...east winds 15 to 25 knots backing northeast after
midnight. a chance of rain and snow showers. waves building to
4 to 7 feet occasionally to 9 feet. 
.tuesday...northeast winds 15 to 25 knots backing north. a chance
of rain showers. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.wednesday...east winds 10 to 20 knots increasing to 15 to
25 knots. waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 280201
glfls 
expires:202603280800;;407718

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri mar 27 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...

30.6 inch high pressure slides from the northern plains into the 
ohio river valley through saturday. the high weakens to 30.5 inches 
as it continues eastward, moving offshore into the atlantic sunday. 
upstream on sunday, a 29.6 inch low will organize over the central 
plains, lifting a 30.0 inch trough over lake superior by sunday 
night. this trough will linger over the great lakes, followed by the 
low tuesday. as the low lifts into canada, 30.3 inch high pressure 
builds over the northern plains, gradually building pressure over 
the upper great lakes by wednesday as the high presses east through 
ontario near 30.5 inches.



lsz263-280800-
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 fri mar 27 2026

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

$$