fzus63 kmqt 161501
glfls 
expires:202512162100;;684697

open lake forecast for lake superior
national weather service marquette mi
1000 am est tue dec 16 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 29.2 inch low moving across the canadian prairies into northern 
ontario this morning brings troughing of 29.2 inches late this 
afternoon into this evening over northern lake superior as the low 
deepens to 28.9 inches near james bay. weak ridging of 29.9 inches 
then returns to lake superior on wednesday, before a 29.0 inch 
alberta clipper tracks from the canadian prairies to western lake 
superior wednesday into thursday morning (weakening to 29.2 inches 
as it does so). the low either crosses the lake or the u.p. and 
northern lake michigan on thursday. while the low lifts towards 
northern quebec thursday night, 30.0 inch ridging returns to lake 
superior on friday via a 30.2 inch high over the lower mississippi 
valley. another low pressure of around 29.5 inches tracks near the 
upper great lakes on saturday with ridging following late in the 
weekend.



lsz162-162100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est tue dec 16 2025 /900 am cst tue dec 16 2025/

...gale warning in effect through late tonight...

.rest of today...southwest gales to 35 knots. waves 6 to 9 feet
occasionally to 11 feet building to 9 to 12 feet occasionally to
15 feet. 
.tonight...west gales to 40 knots diminishing to 20 to 30 knots
late. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.wednesday...west winds 10 to 20 knots backing southwest by late
morning, then becoming south 15 to 25 knots by mid afternoon.
waves subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.wednesday night...south gales to 35 knots veering southwest
after midnight. snow showers likely, a chance of freezing drizzle
and a slight chance of drizzle in the evening. rain showers. a
slight chance of snow showers after midnight. waves building to
4 to 7 feet occasionally to 9 feet. 
.thursday...west gales to 40 knots veering north in the
afternoon. rain showers likely in the morning. snow showers.
freezing spray in the afternoon. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 8 to 11 feet
occasionally to 14 feet. 
.thursday night...north 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. 
.friday...southeast winds 10 to 20 knots becoming south 20 to
30 knots. a chance of snow showers, then snow showers likely.
waves subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots becoming northwest 15 to
25 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 161501
glfls 
expires:202512162100;;684698

open lake forecast for lake superior
national weather service marquette mi
1000 am est tue dec 16 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 29.2 inch low moving across the canadian prairies into northern 
ontario this morning brings troughing of 29.2 inches late this 
afternoon into this evening over northern lake superior as the low 
deepens to 28.9 inches near james bay. weak ridging of 29.9 inches 
then returns to lake superior on wednesday, before a 29.0 inch 
alberta clipper tracks from the canadian prairies to western lake 
superior wednesday into thursday morning (weakening to 29.2 inches 
as it does so). the low either crosses the lake or the u.p. and 
northern lake michigan on thursday. while the low lifts towards 
northern quebec thursday night, 30.0 inch ridging returns to lake 
superior on friday via a 30.2 inch high over the lower mississippi 
valley. another low pressure of around 29.5 inches tracks near the 
upper great lakes on saturday with ridging following late in the 
weekend.



lsz263-162100-
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 tue dec 16 2025

...gale warning in effect through late tonight...

.rest of today...southwest gales to 40 knots. waves 7 to 10 feet
occasionally to 13 feet building to 10 to 14 feet occasionally to
18 feet. 
.tonight...west gales to 40 knots becoming northwest gales to
35 knots late. waves building to 11 to 15 feet occasionally to
19 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. 
.wednesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then backing south by mid afternoon.
waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...south gales to 35 knots. a chance of freezing
drizzle, rain showers and a slight chance of drizzle in the
evening. a chance of snow showers. rain showers likely after
midnight. waves building to 4 to 8 feet occasionally to 10 feet. 
.thursday...southwest gales to 40 knots becoming north gales to
45 knots in the afternoon. a slight chance of rain showers in the
morning. snow showers likely. freezing spray in the afternoon.
waves subsiding to 3 to 6 feet occasionally to 8 feet, then
building to 11 to 15 feet occasionally to 19 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
a chance of snow showers. waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.friday...north winds 15 to 25 knots becoming south 20 to
30 knots. freezing spray. snow showers likely. waves subsiding to
1 to 3 feet, then building to 4 to 7 feet occasionally to 9 feet.
.saturday...west winds 20 to 30 knots veering northwest. freezing
spray. waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$