fzus63 kmqt 192101
glfls 
expires:202512200900;;877823

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

29.9 inch ridge is moving over lake superior 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 tracks north of lake superior on tonight through 
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.



lsz162-200900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est fri dec 19 2025 /300 pm cst fri dec 19 2025/

...gale warning in effect from saturday morning through late
saturday night...
...heavy freezing spray warning in effect from saturday afternoon
through sunday morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 192101
glfls 
expires:202512200900;;877824

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

29.9 inch ridge is moving over lake superior 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 tracks north of lake superior on tonight through 
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.



lsz263-200900-
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 fri dec 19 2025

...gale warning in effect from saturday morning through late
saturday night...
...heavy freezing spray warning in effect from saturday afternoon
through sunday morning...

.late this afternoon...southeast winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...south winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then veering southwest late. a chance of
snow showers in the evening, then snow showers likely 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 40 knots diminishing to
20 to 30 knots late. heavy freezing spray. a chance of snow
showers. waves subsiding to 4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 10 to 20 knots backing west in the
afternoon. a slight chance of snow showers in the morning. waves
subsiding to 1 to 3 feet. 
.sunday night...southwest winds 15 to 25 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.monday...southwest winds 10 to 20 knots backing south in the
afternoon. waves subsiding to calm to 2 feet. 
.monday night...south winds 5 to 15 knots becoming west 10 to
20 knots after midnight. a chance of snow showers. waves building
to 2 to 4 feet. 
.tuesday...northwest winds 15 to 25 knots becoming north 5 to
15 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 
.wednesday...south winds 5 to 15 knots. waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$