fzus63 kmqt 040801
glfls 
expires:202608042000;;596357

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 4 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 tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 30.0 inch ridging returns on wednesday as 
high pressure builds into the great lakes from the northern plains. 
for the late week and into the weekend, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue aug 4 2026 /301 am cdt tue aug 4 2026/

.early this morning...southwest winds 15 to 25 knots. showers
likely and a slight chance of thunderstorms. waves 2 to 4 feet. 
.today...west winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon, then backing southwest late. waves subsiding to
1 to 3 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots veering southwest
after midnight. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots backing south by mid
afternoon. waves calm to 2 feet. 
.thursday night...southwest winds 10 to 20 knots. waves calm to
2 feet. 
.friday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 
.saturday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 040801
glfls 
expires:202608042000;;596358

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 4 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 tracks across the lake today as a 29.4 inch low 
moves over hudson bay. 30.0 inch ridging returns on wednesday as 
high pressure builds into the great lakes from the northern plains. 
for the late week and into the weekend, lake superior will be 
between a 30.3 inch bermuda high and a 29.6 inch low pressure around 
western hudson bay.




lsz263-042000-
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-
401 am edt tue aug 4 2026

.early this morning...southwest winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms. waves 2 to 4 feet. 
.today...west winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon, then backing southwest late. a chance of
showers through early afternoon. waves 2 to 4 feet. 
.tonight...west winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots veering southwest
after midnight. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.thursday night...south winds 10 to 20 knots veering southwest
after midnight. waves building to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.saturday...southwest winds 10 to 20 knots becoming west 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$