fzus63 kmqt 170901
glfls 
expires:202602172100;;774567

open lake forecast for lake superior
national weather service marquette mi
400 am est tue feb 17 2026

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...

high pressure of 30.0 inches over lake superior this morning will 
strengthen to 30.2 inches through this afternoon as a 30.4 inch 
ridge crosses northern ontario today. pressure will gradually fall 
through tonight to 29.6 inches over the lake by wednesday morning as 
a 29.1 inch low moves from the rockies to the northern plains. 29.8 
inch troughing then persists over the lake through thursday, 
deepening back to 29.5 inches by friday morning as a 29.3 inch low 
approaches upper michigan from the south.



lsz162-172100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est tue feb 17 2026 /300 am cst tue feb 17 2026/

...gale warning in effect from 4 pm est /3 pm cst/ this afternoon
through this evening...
...storm warning in effect from this evening through wednesday
evening...

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...east winds 10 to 20 knots increasing to gales to
40 knots. waves building to 6 to 9 feet occasionally to 11 feet. 
.tonight...east gales to 45 knots increasing to storm force winds
to 55 knots late. a chance of snow, possibly mixed with freezing
rain in the evening, then snow after midnight. waves building to
7 to 11 feet occasionally to 14 feet. 
.wednesday...east storm force winds to 55 knots diminishing to
gales to 45 knots by mid afternoon. snow. waves subsiding to 6 to
9 feet occasionally to 11 feet. 
.wednesday night...east gales to 45 knots. snow showers likely in
the evening, then a chance of snow showers after midnight. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.thursday...east gales to 35 knots becoming northeast 20 to
30 knots in the afternoon. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.thursday night...northeast winds 20 to 30 knots. a chance of
snow showers. waves subsiding to 2 to 4 feet. 
.friday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. a chance of snow. waves 2 to 4 feet. 
.saturday...northwest winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170901
glfls 
expires:202602172100;;774568

open lake forecast for lake superior
national weather service marquette mi
400 am est tue feb 17 2026

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...

high pressure of 30.0 inches over lake superior this morning will 
strengthen to 30.2 inches through this afternoon as a 30.4 inch 
ridge crosses northern ontario today. pressure will gradually fall 
through tonight to 29.6 inches over the lake by wednesday morning as 
a 29.1 inch low moves from the rockies to the northern plains. 29.8 
inch troughing then persists over the lake through thursday, 
deepening back to 29.5 inches by friday morning as a 29.3 inch low 
approaches upper michigan from the south.



lsz263-172100-
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 am est tue feb 17 2026

...gale warning in effect from late tonight through late
wednesday night...

.early this morning...east winds less than 10 knots. patchy dense
fog. waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots becoming east 15 to
25 knots by late morning, then increasing to 20 to 30 knots by
mid afternoon. waves building to 2 to 4 feet. 
.tonight...east gales to 45 knots. a chance of snow, possibly
mixed with freezing rain in the evening, then snow after
midnight. waves building to 10 to 14 feet occasionally to
18 feet. 
.wednesday...east gales to 45 knots with a few storm force gusts
to 55 knots possible diminishing to gales to 45 knots. snow.
rain, possibly mixed with freezing rain in the afternoon. waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet. 
.wednesday night...east gales to 45 knots. a chance of snow
showers. waves subsiding to 8 to 11 feet occasionally to 14 feet.
.thursday...east gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. a chance of snow showers. waves subsiding to
5 to 8 feet occasionally to 10 feet. 
.thursday night...east winds 20 to 30 knots becoming northeast
gales to 35 knots after midnight. a chance of snow showers. waves
5 to 8 feet occasionally to 10 feet. 
.friday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. a chance of snow. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.saturday...northwest winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$