fzus63 kmqt 260301
glfls 
expires:202512260900;;231866

open lake forecast for lake superior
national weather service marquette mi
1000 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...

low pressure of 29.6 inches moves east along the southern end of the 
great lakes basin today while extending a 29.8 inch trough north 
over the upper great lakes. 30.1 inch ridging builds across the 
region saturday before another low of 29.6 inches then lifts over 
lower michigan sunday while extending a 29.8 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 29.0 
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-
1000 pm est thu dec 25 2025 /900 pm cst thu dec 25 2025/

.rest of tonight...southeast winds 15 to 25 knots becoming south
10 to 20 knots late. sleet likely late in the evening. snow
showers, possibly mixed with rain. a slight chance of sleet after
midnight. waves 4 to 7 feet occasionally to 9 feet 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 260301
glfls 
expires:202512260900;;231867

open lake forecast for lake superior
national weather service marquette mi
1000 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...

low pressure of 29.6 inches moves east along the southern end of the 
great lakes basin today while extending a 29.8 inch trough north 
over the upper great lakes. 30.1 inch ridging builds across the 
region saturday before another low of 29.6 inches then lifts over 
lower michigan sunday while extending a 29.8 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 29.0 
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-
1000 pm est thu dec 25 2025

.rest of 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 late in the evening. a chance of sleet. snow
showers, possibly mixed with rain after midnight. waves 5 to
8 feet occasionally to 10 feet 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.

$$