fzus63 kmqt 252101
glfls 
expires:202512260900;;217889

open lake forecast for lake superior
national weather service marquette mi
400 pm 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.



lsz162-260900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est thu dec 25 2025 /300 pm cst thu dec 25 2025/

.late this afternoon...east winds 15 to 25 knots. a slight chance
of snow showers, possibly mixed with sleet. waves 4 to 7 feet
occasionally to 9 feet. 
.tonight...southeast winds 15 to 25 knots becoming south 10 to
20 knots late. sleet likely, possibly mixed with snow showers in
the evening. rain showers likely. snow showers, possibly mixed
with sleet after midnight. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.friday...south winds 5 to 15 knots veering west by late morning,
then veering northwest by mid afternoon. a chance of rain
showers, possibly mixed with snow and sleet in the morning. waves
subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots backing south by
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, possibly
mixed with snow. waves calm to 2 feet. 
.saturday night...south winds 5 to 15 knots. a chance of rain
showers. waves calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. a chance of rain and snow showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.sunday night...northwest gales to 35 knots becoming north gales
to 40 knots after midnight. heavy freezing spray. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.monday...northwest gales to 40 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 1 to 3 feet. 
.tuesday...west winds 15 to 25 knots becoming northwest 20 to
30 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 252101
glfls 
expires:202512260900;;217890

open lake forecast for lake superior
national weather service marquette mi
400 pm 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.



lsz263-260900-
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 thu dec 25 2025

.late this afternoon...southeast winds 15 to 25 knots. a slight
chance of snow showers. waves 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 after midnight. waves building to 7 to 10 feet occasionally
to 13 feet. 
.friday...south winds 15 to 25 knots becoming west 5 to 15 knots
by late morning, then veering northwest by mid afternoon. a
chance of rain showers, possibly mixed with snow and sleet in the
morning. waves subsiding to 2 to 4 feet. 
.friday night...west winds less than 10 knots becoming south 5 to
15 knots by midnight. waves subsiding to calm to 2 feet. 
.saturday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. a slight chance of rain showers in the
afternoon. waves building to 1 to 3 feet. 
.saturday night...south winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a chance of rain showers. waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots increasing to gales to
35 knots in the afternoon. a chance of rain and snow showers.
waves subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...north gales to 45 knots. heavy freezing spray.
snow showers likely. waves building to 10 to 14 feet occasionally
to 18 feet. 
.monday...north gales to 45 knots becoming northwest gales to
40 knots. heavy freezing spray. a chance of snow showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 20 to 30 knots becoming northwest gales to
35 knots. freezing spray. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
4 to 7 feet occasionally to 9 feet. 

note, wave height forecasts are for ice free areas.

$$