fzus63 kmqt 190301
glfls 
expires:202602190900;;875788

open lake forecast for lake superior
national weather service marquette mi
1000 pm est wed feb 18 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...

29.7 inch troughing persists over lake superior through thursday as 
a 29.5 inch low over northern wisconsin tonight moves east to upper 
michigan and weakens to 29.7 inches through thursday morning. 
pressure then falls to around 29.6 inches over the lake for friday 
as a 29.3 inch low over missouri thursday afternoon tracks to 
northern lower michigan by friday afternoon. pressure then rises 
saturday through monday as the low pressure dissipates over the 
great lakes and high pressure of near 31.0 inches descends southeast 
into the region. pressure over the lake reaches at least 30.4 inches 
by monday night.



lsz162-190900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est wed feb 18 2026 /900 pm cst wed feb 18 2026/

...gale warning in effect until 1 am est /midnight cst/
thursday...

.rest of tonight...east gales to 40 knots. snow showers. waves
9 to 12 feet occasionally to 15 feet subsiding to 7 to 10 feet
occasionally to 13 feet. 
.thursday...east gales to 35 knots diminishing to 20 to 30 knots
by late morning, then backing northeast by mid afternoon. snow
showers likely in the morning, then a chance of snow showers in
the afternoon. waves subsiding to 4 to 7 feet occasionally to
9 feet. 
.thursday night...northeast winds 20 to 30 knots. a chance of
snow. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...northeast winds 20 to 30 knots. a chance of snow. waves
building to 3 to 6 feet occasionally to 8 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. a chance of snow
showers. waves subsiding to calm to 2 feet. 
.saturday night...northwest winds 10 to 20 knots. a chance of
snow showers. waves calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots veering north. waves
calm to 2 feet. 
.monday...north winds 5 to 15 knots veering east. waves calm to
2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 190301
glfls 
expires:202602190900;;875789

open lake forecast for lake superior
national weather service marquette mi
1000 pm est wed feb 18 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...

29.7 inch troughing persists over lake superior through thursday as 
a 29.5 inch low over northern wisconsin tonight moves east to upper 
michigan and weakens to 29.7 inches through thursday morning. 
pressure then falls to around 29.6 inches over the lake for friday 
as a 29.3 inch low over missouri thursday afternoon tracks to 
northern lower michigan by friday afternoon. pressure then rises 
saturday through monday as the low pressure dissipates over the 
great lakes and high pressure of near 31.0 inches descends southeast 
into the region. pressure over the lake reaches at least 30.4 inches 
by monday night.



lsz263-190900-
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 wed feb 18 2026

...gale warning in effect until 1 am est thursday...

.rest of tonight...east gales to 45 knots. a chance of snow
showers late in the evening, then snow showers after midnight.
waves 15 to 20 feet occasionally to 25 feet subsiding to 11 to
15 feet occasionally to 19 feet. 
.thursday...east gales to 35 knots diminishing to 20 to 30 knots.
snow showers in the morning, then a chance of snow showers in the
afternoon. waves subsiding to 8 to 11 feet occasionally to
14 feet. 
.thursday night...east winds 20 to 30 knots becoming northeast
gales to 35 knots late. a chance of snow. a slight chance of
freezing rain after midnight. waves subsiding to 6 to 9 feet
occasionally to 11 feet. 
.friday...northeast winds 20 to 30 knots. a chance of snow. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 
.friday night...north winds 15 to 25 knots. a chance of snow
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...north winds 10 to 20 knots backing northwest in the
afternoon. a chance of snow showers. waves subsiding to 1 to
3 feet. 
.saturday night...northwest winds 10 to 20 knots veering north
after midnight. a chance of snow showers. waves building to 3 to
5 feet occasionally to 7 feet. 
.sunday...northwest winds 10 to 20 knots veering north. waves
building to 3 to 6 feet occasionally to 8 feet. 
.monday...north winds 5 to 15 knots veering east. waves subsiding
to calm to 2 feet, then building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$