fzus63 kmqt 271401
glfls 
expires:202603272000;;380882

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 today 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 around 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.



lsz162-272000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt fri mar 27 2026 /900 am cdt fri mar 27 2026/

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

$$

fzus63 kmqt 271401
glfls 
expires:202603272000;;380883

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 today 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 around 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.



lsz263-272000-
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 fri mar 27 2026

.rest of today...northwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon. a slight chance of snow showers.
waves calm to 2 feet building to 3 to 6 feet occasionally to
8 feet. 
.tonight...northwest winds 15 to 25 knots backing west late.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...west winds 10 to 20 knots backing south late. a
slight chance of snow showers by mid afternoon. waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet. 
.saturday night...south winds 5 to 15 knots backing east after
midnight. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.sunday night...north winds 5 to 15 knots. waves calm to 2 feet. 
.monday...northeast winds 10 to 20 knots becoming east 15 to
25 knots. waves building to 4 to 7 feet occasionally to 9 feet. 
.tuesday...east winds 15 to 25 knots becoming north 20 to
30 knots. a chance of rain showers, possibly mixed with snow.
waves building to 5 to 9 feet occasionally to 11 feet. 

$$