fzus63 kmqt 171506
glfls 
expires:202512172315;;742279

open lake forecast for lake superior
national weather service marquette mi
issued by national weather service gaylord mi
1006 am est wed dec 17 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...

weak ridge axis of 29.9 inches lies across western lake superior 
today...before a 28.9 inch alberta clipper tracks from the 
canadian prairies to lake superior tonight, weakening to 29.1 
inches as it does so. on thursday the low tracks east over the 
lake before reaching quebec by friday. a 30.0 inch ridge then 
returns to the lake on friday via a 30.2 inch high over the lower 
mississippi valley and a weakening 30.0 inch high over northern 
ontario. another low pressure of around 29.5 inches tracks near 
the upper great lakes on saturday. this is then followed by a 30.3
inch high over the canadian prairies diving southeast into the 
great lakes late this weekend, rising to 30.5 inches on sunday 
evening.


lsz162-172315-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1006 am est wed dec 17 2025 /906 am cst wed dec 17 2025/

...gale warning in effect from thursday afternoon through late
thursday night...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 171506
glfls 
expires:202512172315;;742280

open lake forecast for lake superior
national weather service marquette mi
issued by national weather service gaylord mi
1006 am est wed dec 17 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...

weak ridge axis of 29.9 inches lies across western lake superior 
today...before a 28.9 inch alberta clipper tracks from the 
canadian prairies to lake superior tonight, weakening to 29.1 
inches as it does so. on thursday the low tracks east over the 
lake before reaching quebec by friday. a 30.0 inch ridge then 
returns to the lake on friday via a 30.2 inch high over the lower 
mississippi valley and a weakening 30.0 inch high over northern 
ontario. another low pressure of around 29.5 inches tracks near 
the upper great lakes on saturday. this is then followed by a 30.3
inch high over the canadian prairies diving southeast into the 
great lakes late this weekend, rising to 30.5 inches on sunday 
evening.


lsz263-172315-
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-
1006 am est wed dec 17 2025

...gale warning in effect from thursday afternoon through friday
morning...

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

note, wave height forecasts are for ice free areas.

$$