fzus63 kmqt 250801
glfls 
expires:202603252000;;259721

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed mar 25 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 29.8 inch trough will extend over lake superior today as 30.4 inch 
high pressure departs into quebec and a 29.7 inch clipper low over 
northern minnesota phases with a low moving off the northern 
rockies. troughing of 29.8 inches remains over the great lakes basin 
into thursday before expansive ridging of 30.7 inches builds from 
central canada over much of the northern conus by friday. this will 
maintain 30.4 inch ridging over lake superior through sunday morning 
as the 30.7 inch high shifts to the mid-atlantic.



lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt wed mar 25 2026 /300 am cdt wed mar 25 2026/

.early this morning...east winds 5 to 15 knots. a chance of rain
and snow showers. waves 1 to 3 feet. 
.today...east winds 5 to 15 knots backing northeast late. a
slight chance of rain and snow showers through early afternoon.
waves subsiding to calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots becoming north 10 to
20 knots late. a chance of rain showers, possibly mixed with
freezing rain after midnight. waves calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. a slight chance of rain and snow showers through early
afternoon. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.thursday night...north winds 10 to 20 knots. waves calm to
2 feet. 
.friday...northwest winds 10 to 20 knots backing west by mid
afternoon. waves building to 1 to 3 feet. 
.friday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...west winds 10 to 20 knots becoming south 5 to
15 knots. waves calm to 2 feet. 
.sunday...east winds 5 to 15 knots backing north. waves calm to
2 feet. 

$$

fzus63 kmqt 250801
glfls 
expires:202603252000;;259722

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed mar 25 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 29.8 inch trough will extend over lake superior today as 30.4 inch 
high pressure departs into quebec and a 29.7 inch clipper low over 
northern minnesota phases with a low moving off the northern 
rockies. troughing of 29.8 inches remains over the great lakes basin 
into thursday before expansive ridging of 30.7 inches builds from 
central canada over much of the northern conus by friday. this will 
maintain 30.4 inch ridging over lake superior through sunday morning 
as the 30.7 inch high shifts to the mid-atlantic.



lsz263-252000-
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 wed mar 25 2026

.early this morning...southeast winds 10 to 20 knots. a chance of
snow showers, possibly mixed with rain. waves 1 to 3 feet
building to 2 to 4 feet. 
.today...southeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing north late. a chance of
rain showers, possibly mixed with snow. waves subsiding to calm
to 2 feet. 
.tonight...northeast winds 5 to 15 knots becoming north 10 to
20 knots late. a slight chance of rain showers, freezing rain and
snow showers after midnight. waves building to 1 to 3 feet. 
.thursday...north winds 10 to 20 knots. a slight chance of rain
and snow showers through early afternoon. waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.thursday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 15 knots becoming west 15 to
25 knots by mid afternoon. waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.friday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.saturday...west winds 10 to 20 knots becoming south 5 to
15 knots. waves subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots becoming west 10 to 20 knots.
waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet. 

$$