fzus63 kmqt 270801
glfls 
expires:202603272000;;367757

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

today, high pressure builds to 30.8 inches over the northern plains. 
because of this, expect heights to rise to 30.4 inches over lake 
superior today. as this high slowly slides southeast through friday 
and into saturday morning, it weakens to 30.6 inches, eventually 
moving south of lake michigan by midday saturday. as the high 
further weakens to 30.5 inches over the northern appalachian range 
saturday evening, broad 29.7 inch low pressure develops in the 
colorado/wyoming area. on sunday, the high shifts offshore while the 
low extends a weak 30.0 inch trough over lake superior by sunday 
evening. the low deepens to 29.4 inches over the northern plains 
monday night before lifting into the upper great lakes on tuesday. 
30.3 inch high pressure ridging over the canadian prairies and 
northern plains tuesday night moves over lake superior wednesday as 
it strengthens to 30.5 inches.



lsz162-272000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt fri mar 27 2026 /300 am cdt fri mar 27 2026/

.early this morning...north winds 10 to 20 knots. waves calm to
2 feet. 
.today...northwest winds 10 to 20 knots increasing to 20 to
30 knots. waves 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 2 to
4 feet, then subsiding 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 5 feet occasionally to 7 feet. 
.tuesday...east winds 15 to 25 knots backing north. 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. 

$$

fzus63 kmqt 270801
glfls 
expires:202603272000;;367758

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

today, high pressure builds to 30.8 inches over the northern plains. 
because of this, expect heights to rise to 30.4 inches over lake 
superior today. as this high slowly slides southeast through friday 
and into saturday morning, it weakens to 30.6 inches, eventually 
moving south of lake michigan by midday saturday. as the high 
further weakens to 30.5 inches over the northern appalachian range 
saturday evening, broad 29.7 inch low pressure develops in the 
colorado/wyoming area. on sunday, the high shifts offshore while the 
low extends a weak 30.0 inch trough over lake superior by sunday 
evening. the low deepens to 29.4 inches over the northern plains 
monday night before lifting into the upper great lakes on tuesday. 
30.3 inch high pressure ridging over the canadian prairies and 
northern plains tuesday night moves over lake superior wednesday as 
it strengthens to 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-
400 am edt fri mar 27 2026

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. a slight chance of snow showers. waves
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 3 to 5 feet occasionally to 7 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 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 

$$