fzus63 kmqt 250900
glfls 
expires:202512252100;;187601

open lake forecast for lake superior
national weather service marquette mi
400 am est thu dec 25 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...

30.4 inch ridging returns to lake superior today as a 30.5 inch high 
transits northern ontario. low pressure of 29.6 inches moves east 
along the southern end of the great lakes basin on friday. another 
low of 29.6 inches then lifts over lower michigan sunday while 
extending a 29.7 inch trough northward across the lake. by monday, a 
strong high pressure of at least 30.6 inches will reside over the 
great plains as the low deepens to 29.1 inches over quebec, yielding 
a tight pressure gradient across the great lakes.



lsz263-252100-
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 est thu dec 25 2025

.early this morning...northeast winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet. 
.today...northeast winds 15 to 25 knots veering east. a slight
chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tonight...southeast winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible by midnight,
then becoming south 20 to 30 knots late. a chance of snow showers
in the evening, then snow showers, possibly mixed with rain and
sleet likely after midnight. waves building to 6 to 10 feet
occasionally to 13 feet. 
.friday...south winds 15 to 25 knots becoming west 5 to 15 knots.
a chance of rain showers, possibly mixed with snow and sleet in
the morning. waves subsiding to 2 to 4 feet. 
.friday night...southwest winds less than 10 knots becoming south
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...south winds 5 to 15 knots backing southeast in the
afternoon. waves building to 1 to 3 feet. 
.saturday night...south winds 5 to 15 knots. a chance of rain
showers. waves 1 to 3 feet. 
.sunday...northwest gales to 45 knots. a chance of rain showers.
a chance of snow showers. freezing spray. waves building to 10 to
14 feet occasionally to 18 feet. 
.monday...northwest storm force winds to 50 knots diminishing to
gales to 45 knots. heavy freezing spray. a chance of snow
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 250900
glfls 
expires:202512252100;;187600

open lake forecast for lake superior
national weather service marquette mi
400 am est thu dec 25 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...

30.4 inch ridging returns to lake superior today as a 30.5 inch high 
transits northern ontario. low pressure of 29.6 inches moves east 
along the southern end of the great lakes basin on friday. another 
low of 29.6 inches then lifts over lower michigan sunday while 
extending a 29.7 inch trough northward across the lake. by monday, a 
strong high pressure of at least 30.6 inches will reside over the 
great plains as the low deepens to 29.1 inches over quebec, yielding 
a tight pressure gradient across the great lakes.



lsz162-252100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est thu dec 25 2025 /300 am cst thu dec 25 2025/

.early this morning...northeast winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet. 
.today...east winds 15 to 25 knots. a chance of snow showers.
waves building to 4 to 7 feet occasionally to 9 feet. 
.tonight...southeast winds 15 to 25 knots becoming south 10 to
20 knots late. snow showers, possibly mixed with sleet and
freezing rain likely. rain showers likely after midnight. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 5 to 15 knots veering west. a chance of
rain showers, possibly mixed with snow and sleet in the morning.
waves subsiding to calm to 2 feet. 
.friday night...southwest winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. a chance of rain showers. waves calm
to 2 feet. 
.saturday night...south winds 10 to 20 knots veering southwest
after midnight. a chance of rain showers. waves calm to 2 feet. 
.sunday...northwest gales to 45 knots. a chance of rain showers.
a chance of snow showers. heavy freezing spray. waves building to
5 to 8 feet occasionally to 10 feet. 
.monday...northwest gales to 40 knots. heavy freezing spray.
waves subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$