fzus63 kmqt 191501
glfls 
expires:202512192100;;862583

open lake forecast for lake superior
national weather service marquette mi
1000 am est fri dec 19 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...

behind a 29.0 inch clipper lifting from northern ontario into 
northern northern quebec this morning, a 29.9 inch ridge moves over 
lake superior by late this afternoon via a 30.2 inch high over the 
lower mississippi valley and a weakening 29.9 inch high moving 
across northern ontario. a low pressure of around 29.3 inches then 
tracks north of lake superior on saturday. 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.



lsz162-192100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est fri dec 19 2025 /900 am cst fri dec 19 2025/

...heavy freezing spray warning in effect until 11 am est /10 am
cst/ this morning...
...gale watch in effect from saturday morning through late
saturday night...

.rest of today...north winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then veering south by mid afternoon. a
slight chance of snow showers in the afternoon. waves 3 to 6 feet
occasionally to 8 feet subsiding to calm to 2 feet. 
.tonight...south winds 15 to 25 knots becoming southwest gales to
35 knots by midnight. a chance of snow showers in the evening,
then snow showers after midnight. waves building to 6 to 9 feet
occasionally to 11 feet. 
.saturday...west gales to 40 knots. heavy freezing spray. a
slight chance of snow showers. waves building to 8 to 12 feet
occasionally to 15 feet. 
.saturday night...northwest gales to 40 knots diminishing to
20 to 30 knots after midnight. heavy freezing spray in the
evening. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday...northwest winds 10 to 20 knots backing west in the
afternoon. waves subsiding to calm to 2 feet. 
.sunday night...southwest winds 10 to 20 knots. waves building to
1 to 3 feet. 
.monday...south winds 10 to 20 knots veering west. a chance of
snow showers. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.tuesday...west winds 10 to 20 knots becoming southeast 5 to
15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 191501
glfls 
expires:202512192100;;862584

open lake forecast for lake superior
national weather service marquette mi
1000 am est fri dec 19 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...

behind a 29.0 inch clipper lifting from northern ontario into 
northern northern quebec this morning, a 29.9 inch ridge moves over 
lake superior by late this afternoon via a 30.2 inch high over the 
lower mississippi valley and a weakening 29.9 inch high moving 
across northern ontario. a low pressure of around 29.3 inches then 
tracks north of lake superior on saturday. 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.



lsz263-192100-
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 am est fri dec 19 2025

...heavy freezing spray warning in effect until 11 am est this
morning...
...gale watch in effect from late tonight through late saturday
night...

.rest of today...north winds 15 to 25 knots becoming south 5 to
15 knots by mid afternoon. freezing spray late in the morning. a
slight chance of snow showers late in the morning. waves 7 to
10 feet occasionally to 13 feet subsiding to 1 to 3 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
35 knots by midnight, then veering southwest late. a slight
chance of snow showers in the evening, then snow showers after
midnight. waves building to 7 to 10 feet occasionally to 13 feet.
.saturday...southwest gales to 40 knots becoming west gales to
45 knots. a chance of snow showers. freezing spray in the
afternoon. waves building to 12 to 17 feet occasionally to
21 feet. 
.saturday night...northwest gales to 45 knots. heavy freezing
spray. a slight chance of snow showers. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.sunday...northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...southwest winds 10 to 20 knots. waves building to
2 to 4 feet. 
.monday...south winds 10 to 20 knots veering southwest. a chance
of snow showers. waves subsiding to 1 to 3 feet, then building to
2 to 4 feet. 
.tuesday...west winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$