fzus63 kmqt 210301
glfls 
expires:202512210900;;947388

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sat dec 20 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 low pressure of around 29.3 inches continues its track eastward 
into quebec tonight. this is then followed by a 30.3 inch high over 
the canadian prairies sliding southeast into the ohio river valley 
late this weekend, building to 30.7 inches by monday morning as it 
continues towards the mid-atlantic. lake superior remains under the 
influence of this high until a weakening 29.9 inch low moves across 
the lake monday night through tuesday morning. afterwards, a 30.3 
inch high pressure moves over lake superior from the canadian 
prairies tuesday night with weak troughing of 30.0 inches moving 
over the lake lake wednesday as the high shifts east. this will be 
followed by low pressure of around 29.7 inches moving across the 
great lakes basin late thursday into friday.



lsz162-210900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est sat dec 20 2025 /900 pm cst sat dec 20 2025/

...gale warning in effect until 1 am est /midnight cst/ sunday...
...heavy freezing spray warning in effect until 7 am est /6 am
cst/ sunday...

.rest of tonight...northwest gales to 35 knots diminishing to
15 to 25 knots. heavy freezing spray late in the evening. waves
7 to 10 feet occasionally to 13 feet subsiding to 2 to 4 feet. 
.sunday...west winds 10 to 20 knots backing southwest by mid
afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...southwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...south winds 10 to 20 knots backing east in the
afternoon. a chance of snow showers. waves calm to 2 feet. 
.monday night...southeast winds 10 to 20 knots veering west after
midnight. a chance of snow showers. waves calm to 2 feet. 
.tuesday...west winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.tuesday night...north winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing east. waves
calm to 2 feet. 
.thursday...south winds 10 to 20 knots veering west. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 210301
glfls 
expires:202512210900;;947389

open lake forecast for lake superior
national weather service marquette mi
1000 pm est sat dec 20 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 low pressure of around 29.3 inches continues its track eastward 
into quebec tonight. this is then followed by a 30.3 inch high over 
the canadian prairies sliding southeast into the ohio river valley 
late this weekend, building to 30.7 inches by monday morning as it 
continues towards the mid-atlantic. lake superior remains under the 
influence of this high until a weakening 29.9 inch low moves across 
the lake monday night through tuesday morning. afterwards, a 30.3 
inch high pressure moves over lake superior from the canadian 
prairies tuesday night with weak troughing of 30.0 inches moving 
over the lake lake wednesday as the high shifts east. this will be 
followed by low pressure of around 29.7 inches moving across the 
great lakes basin late thursday into friday.



lsz263-210900-
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 sat dec 20 2025

...gale warning in effect until 1 am est sunday...
...heavy freezing spray warning in effect until 7 am est sunday...

.rest of tonight...northwest gales to 35 knots diminishing to
15 to 25 knots late. heavy freezing spray. a slight chance of
snow showers. waves 10 to 14 feet occasionally to 18 feet
subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...west winds 10 to 20 knots backing southwest by mid
afternoon. a slight chance of snow showers in the morning. waves
subsiding to 2 to 4 feet. 
.sunday night...southwest winds 10 to 20 knots diminishing to
5 to 15 knots by midnight. waves subsiding to 1 to 3 feet. 
.monday...south winds 5 to 15 knots backing southeast in the
afternoon. a slight chance of snow showers. waves subsiding to
calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots becoming west 15 to
25 knots after midnight. a chance of snow showers. waves building
to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots veering northwest in the
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...northwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 10 to 20 knots becoming east 5 to
15 knots. waves calm to 2 feet. 
.thursday...south winds 15 to 25 knots veering west. waves
building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$