fzus63 kmqt 212101
glfls 
expires:202512220900;;988972

open lake forecast for lake superior
national weather service marquette mi
400 pm est sun dec 21 2025

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 30.3 inch ridging will continue tonight, but weaken monday when a 
low from the plains organizes and lifts northeast through ontario. 
by tuesday this 29.8 inch low will press east north of thunder bay. 
afterwards, a 30.4 inch high pressure moves over lake superior from 
the canadian prairies tuesday night with weak troughing of 30.0 
inches moving over the lake late wednesday as the high shifts east. 
this will be followed by low pressure of at least 29.6 inches moving 
across the great lakes basin late thursday into friday.



lsz162-220900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est sun dec 21 2025 /300 pm cst sun dec 21 2025/

.late this afternoon...southwest winds 10 to 20 knots. waves calm
to 2 feet. 
.tonight...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.monday...southeast winds 5 to 15 knots backing east by late
morning, then increasing to 10 to 20 knots by mid afternoon.
waves calm to 2 feet. 
.monday night...east winds 10 to 20 knots veering southwest by
midnight, then veering west late. a chance of snow. waves
building to 1 to 3 feet. 
.tuesday...west winds 20 to 30 knots. waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 1 to 3 feet. 
.tuesday night...north winds 5 to 15 knots veering southeast
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...south winds 5 to 15 knots veering southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.thursday...east winds 10 to 20 knots backing northeast. a chance
of snow showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.friday...northeast winds 10 to 20 knots veering southeast. a
chance of snow showers. waves subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 212101
glfls 
expires:202512220900;;988973

open lake forecast for lake superior
national weather service marquette mi
400 pm est sun dec 21 2025

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 30.3 inch ridging will continue tonight, but weaken monday when a 
low from the plains organizes and lifts northeast through ontario. 
by tuesday this 29.8 inch low will press east north of thunder bay. 
afterwards, a 30.4 inch high pressure moves over lake superior from 
the canadian prairies tuesday night with weak troughing of 30.0 
inches moving over the lake late wednesday as the high shifts east. 
this will be followed by low pressure of at least 29.6 inches moving 
across the great lakes basin late thursday into friday.



lsz263-220900-
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 pm est sun dec 21 2025

.late this afternoon...southwest winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.monday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots veering south by
midnight, then becoming southwest 15 to 25 knots late. a chance
of snow. a chance of rain after midnight. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.tuesday...west gales to 35 knots. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tuesday night...north winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...south winds 10 to 20 knots veering southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering northeast
after midnight. waves calm to 2 feet. 
.thursday...east winds 15 to 25 knots backing northeast. a chance
of snow showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.friday...northeast winds 15 to 25 knots becoming southeast 10 to
20 knots. a chance of snow showers. waves subsiding to 2 to
4 feet. 

note, wave height forecasts are for ice free areas.

$$