fzus63 kmqt 041401
glfls 
expires:202608042000;;609063

open lake forecast for lake superior
national weather service marquette mi
1001 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 over western lake superior this morning will 
cross the lake today, weakening to 29.9 inches this afternoon.
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, pressure over lake superior will remain around 29.9 to 
30.0 inches between a 30.3 inch bermuda high and 29.5 inch low 
pressure near the western shores of hudson bay.




lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue aug 4 2026 /901 am cdt tue aug 4 2026/

.rest of today...west winds 10 to 20 knots backing southwest
late. waves 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 041401
glfls 
expires:202608042000;;609064

open lake forecast for lake superior
national weather service marquette mi
1001 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 over western lake superior this morning will 
cross the lake today, weakening to 29.9 inches this afternoon.
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, pressure over lake superior will remain around 29.9 to 
30.0 inches between a 30.3 inch bermuda high and 29.5 inch low 
pressure near the western shores of 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-
1001 am edt tue aug 4 2026

.rest of today...west winds 10 to 20 knots backing southwest
late. 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. 

$$