fzus63 kmqt 180901
glfls 
expires:202602182100;;832010

open lake forecast for lake superior
national weather service marquette mi
400 am 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 will persist over lake superior through thursday 
as a 29.3 inch low over minnesota this morning moves east to upper 
michigan and weakens to 29.6 inches through thursday morning. 
pressure will then steadily fall to around 29.4 inches over the lake 
thursday night through friday as a second 29.3 inch low over 
missouri thursday afternoon tracks to northern lake michigan at 29.2 
inches by friday afternoon. pressure then increases to around 30.1 
inches over lake superior through the weekend as the low dissipates 
over the lower great lakes.



lsz162-182100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est wed feb 18 2026 /300 am cst wed feb 18 2026/

...storm warning in effect through this evening...

.early this morning...east storm force winds to 55 knots. snow,
possibly mixed with sleet. waves 7 to 10 feet occasionally to
13 feet. 
.today...east storm force winds to 55 knots diminishing to gales
to 45 knots by mid afternoon. snow. waves building to 7 to
11 feet occasionally to 14 feet. 
.tonight...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 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 3 to 6 feet occasionally to
8 feet. 
.thursday night...northeast winds 20 to 30 knots. a chance of
snow showers. waves subsiding to 1 to 3 feet. 
.friday...northeast winds 20 to 30 knots. a chance of snow. waves
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 180901
glfls 
expires:202602182100;;832011

open lake forecast for lake superior
national weather service marquette mi
400 am 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 will persist over lake superior through thursday 
as a 29.3 inch low over minnesota this morning moves east to upper 
michigan and weakens to 29.6 inches through thursday morning. 
pressure will then steadily fall to around 29.4 inches over the lake 
thursday night through friday as a second 29.3 inch low over 
missouri thursday afternoon tracks to northern lake michigan at 29.2 
inches by friday afternoon. pressure then increases to around 30.1 
inches over lake superior through the weekend as the low dissipates 
over the lower great lakes.



lsz263-182100-
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 wed feb 18 2026

...gale warning in effect through late tonight...

.early this morning...east gales to 45 knots with a few storm
force gusts to 55 knots possible. snow, possibly mixed with
sleet. waves 11 to 15 feet occasionally to 19 feet building to
12 to 17 feet occasionally to 21 feet. 
.today...east gales to 45 knots with a few storm force gusts to
50 knots possible diminishing to gales to 45 knots. snow. waves
building to 15 to 20 feet occasionally to 25 feet. 
.tonight...east gales to 45 knots. snow likely. waves subsiding
to 10 to 14 feet occasionally to 18 feet. 
.thursday...east gales to 35 knots diminishing to 20 to 30 knots.
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
subsiding to 4 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 4 to 7 feet occasionally to 9 feet. 
.friday night...north winds 15 to 25 knots. a chance of snow
showers. waves subsiding to 3 to 5 feet occasionally to 7 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
building to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$