fzus63 kmqt 150300
glfls 
expires:202512150900;;601100

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sun dec 14 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 ridge of high pressure over lake superior will continue 
to weaken through tonight as a 30.7 inch high over the ohio valley 
shifts to the southeastern conus. a 29.9 inch trough will move over 
the lake on monday, followed by a weak 30.0 inch ridge monday night. 
a stronger 29.2 inch trough will cross the lake on tuesday as a 29.0 
inch low tracks across northern ontario. weak ridging of 29.8 inches 
returns on wednesday before a 29.1 inch clipper low traverses the 
lake wednesday night into thursday. 30.1 inch high pressure then 
builds in on friday.



lsz162-150900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est sun dec 14 2025 /900 pm cst sun dec 14 2025/

...heavy freezing spray warning in effect until 4 am est /3 am
cst/ monday...
...gale warning in effect until 7 am est /6 am cst/ monday...

.rest of tonight...southwest gales to 35 knots becoming west
20 to 30 knots late. freezing spray. a chance of snow showers.
waves 4 to 7 feet occasionally to 9 feet building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.monday...west winds 15 to 25 knots becoming northwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. waves subsiding to calm to 2 feet. 
.monday night...northwest winds 5 to 15 knots backing southwest
by midnight, then increasing to 15 to 25 knots late. waves
building to 2 to 4 feet. 
.tuesday...southwest gales to 40 knots. waves building to 8 to
12 feet occasionally to 15 feet. 
.tuesday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots backing south in the
afternoon. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.wednesday night...south gales to 35 knots. a chance of rain
showers in the evening. a chance of snow showers. rain showers
likely after midnight. waves building to 5 to 8 feet occasionally
to 10 feet. 
.thursday...north storm force winds to 55 knots diminishing to
gales to 45 knots. heavy freezing spray. a chance of snow
showers. waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 1 to 3 feet. 
.friday...south winds 20 to 30 knots increasing to gales to
35 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 5 to 8 feet occasionally to 10 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 150300
glfls 
expires:202512150900;;601101

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sun dec 14 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 ridge of high pressure over lake superior will continue 
to weaken through tonight as a 30.7 inch high over the ohio valley 
shifts to the southeastern conus. a 29.9 inch trough will move over 
the lake on monday, followed by a weak 30.0 inch ridge monday night. 
a stronger 29.2 inch trough will cross the lake on tuesday as a 29.0 
inch low tracks across northern ontario. weak ridging of 29.8 inches 
returns on wednesday before a 29.1 inch clipper low traverses the 
lake wednesday night into thursday. 30.1 inch high pressure then 
builds in on friday.



lsz263-150900-
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 sun dec 14 2025

...gale warning in effect until 7 am est monday...

.rest of tonight...southwest winds 20 to 30 knots increasing to
gales to 35 knots by midnight, then veering west late. freezing
spray. a chance of snow showers. waves 4 to 7 feet occasionally
to 9 feet building to 7 to 10 feet occasionally to 13 feet. 
.monday...west winds 20 to 30 knots becoming northwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. freezing spray in the morning. a slight chance of
snow showers in the morning. waves subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots backing southwest
by midnight, then increasing to 15 to 25 knots late. waves
subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.tuesday...southwest gales to 40 knots. waves building to 10 to
14 feet occasionally to 18 feet. 
.tuesday night...west gales to 40 knots veering northwest after
midnight. waves subsiding to 9 to 12 feet occasionally to
15 feet, then building to 10 to 14 feet occasionally to 18 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. waves subsiding to calm to 2 feet,
then building to 1 to 3 feet. 
.wednesday night...south gales to 35 knots. a chance of rain
showers in the evening. a chance of snow showers. rain showers
likely after midnight. waves building to 5 to 8 feet occasionally
to 10 feet. 
.thursday...north storm force winds to 55 knots. snow showers,
possibly mixed with rain. heavy freezing spray. waves building to
15 to 20 feet occasionally to 25 feet, then subsiding to 4 to
7 feet occasionally to 9 feet. 
.friday...south gales to 35 knots. a chance of snow showers.
freezing spray. waves subsiding to 1 to 3 feet, then building to
7 to 10 feet occasionally to 13 feet. 

note, wave height forecasts are for ice free areas.

$$