fzus63 kmqt 172101
glfls 
expires:202602180900;;803405

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

30.1 inch ridging this afternoon gives way to pressure falls tonight 
as 29.1 inch low pressure ejects out of the northern plains. 
pressure will fall to at least 29.7 inches over the lake by 
wednesday morning. 29.8 inch troughing then persists over the lake 
through thursday, deepening to 29.5 inches by friday morning as a 
29.3 inch low approaches upper michigan from the south. this feature 
weakens over lake huron saturday, but continues to extend weak 29.9 
inch troughing over lake superior at least through saturday 
afternoon.



lsz162-180900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm est tue feb 17 2026 /301 pm cst tue feb 17 2026/

...gale warning in effect until 10 pm est /9 pm cst/ this
evening...
...storm warning in effect from 10 pm est /9 pm cst/ this evening
through wednesday evening...

.late this afternoon...east gales to 40 knots. waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet. 
.tonight...east gales to 45 knots increasing to storm force winds
to 55 knots late. a chance of snow in the evening, then snow,
possibly mixed with sleet after midnight. waves building to 7 to
10 feet occasionally to 13 feet. 
.wednesday...east storm force winds to 55 knots diminishing to
gales to 45 knots by mid afternoon. snow. rain likely in the
afternoon. waves 7 to 10 feet occasionally to 13 feet. 
.wednesday night...east gales to 45 knots. snow showers likely.
waves subsiding to 5 to 8 feet occasionally to 10 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. waves subsiding to 2 to 4 feet. 
.friday...northeast winds 20 to 30 knots. a chance of snow. waves
2 to 4 feet. 
.friday night...north winds 15 to 25 knots backing northwest
after midnight. a chance of snow showers. waves subsiding to 1 to
3 feet. 
.saturday...northwest winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots veering north. waves
calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202602180900;;803406

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

30.1 inch ridging this afternoon gives way to pressure falls tonight 
as 29.1 inch low pressure ejects out of the northern plains. 
pressure will fall to at least 29.7 inches over the lake by 
wednesday morning. 29.8 inch troughing then persists over the lake 
through thursday, deepening to 29.5 inches by friday morning as a 
29.3 inch low approaches upper michigan from the south. this feature 
weakens over lake huron saturday, but continues to extend weak 29.9 
inch troughing over lake superior at least through saturday 
afternoon.



lsz263-180900-
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-
401 pm est tue feb 17 2026

...gale warning in effect from 1 am est wednesday through late
wednesday night...

.late this afternoon...east winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...east gales to 45 knots. a slight chance of snow in the
evening, then snow, possibly mixed with freezing rain and sleet
after midnight. waves building to 12 to 17 feet occasionally to
21 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
likely in the afternoon. waves building to 17 to 22 feet
occasionally to 28 feet, then subsiding to 15 to 20 feet
occasionally to 25 feet. 
.wednesday night...east gales to 45 knots. a chance of snow
showers. waves subsiding to 10 to 14 feet occasionally to
18 feet. 
.thursday...east gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. a chance of snow showers. a slight chance of
rain showers in the afternoon. waves subsiding to 6 to 9 feet
occasionally to 11 feet. 
.thursday night...east winds 20 to 30 knots becoming northeast
gales to 35 knots after midnight. a chance of snow. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 
.friday...northeast winds 20 to 30 knots. a chance of snow. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...north winds 15 to 25 knots. a chance of snow
showers. waves 3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 10 to 20 knots. waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.sunday...northwest winds 10 to 20 knots veering north. waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$