fzus63 kmqt 180301
glfls 
expires:202602180900;;817718

open lake forecast for lake superior
national weather service marquette mi
1000 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 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 tomorrow 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-
1000 pm est tue feb 17 2026 /900 pm cst tue feb 17 2026/

...storm warning in effect through wednesday evening...

.rest of tonight...east gales to 45 knots increasing to storm
force winds to 55 knots by midnight. a chance of snow late in the
evening. a slight chance of sleet. snow after midnight. waves
6 to 9 feet occasionally to 11 feet 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
subsiding to 1 to 3 feet, then building to 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 180301
glfls 
expires:202602180900;;817719

open lake forecast for lake superior
national weather service marquette mi
1000 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 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 tomorrow 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-
1000 pm est tue feb 17 2026

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

.rest of tonight...east gales to 45 knots increasing to gales to
45 knots with a few storm force gusts to 55 knots possible late.
a slight chance of snow late in the evening, then snow, possibly
mixed with freezing rain and sleet after midnight. waves 3 to
6 feet occasionally to 8 feet building to 12 to 17 feet
occasionally to 21 feet. 
.wednesday...east gales to 45 knots with a few storm force gusts
to 50 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
building to 6 to 9 feet occasionally to 11 feet, then 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.

$$