fzus63 kmqt 190901
glfls 
expires:202602192100;;890162

open lake forecast for lake superior
national weather service marquette mi
400 am est thu feb 19 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...

29.6 inch low over lake superior this morning weakens to 29.7 inches 
by this evening as a 29.4 inch low over the central plains deepens 
to 29.1 inches before arriving over the western great lakes friday 
morning. troughing increases to 29.6 inches over lake superior on 
friday morning as the low moves through northern lower michigan, 
before the low lifts towards ontario and weakens to 29.5 inches by 
friday evening. remnant troughing over lake superior weakens to 30.0 
inches by saturday morning as ridging builds over the northern 
plains. pressure continues to rise over lake superior saturday 
through monday as the ridging over the northern plains continues to 
push eastwards with time, eventually peaking at 30.5 inches over the 
lake late monday. behind the ridging, a deepening 29.6 inch clipper 
low moves into the northern plains on tuesday.



lsz162-192100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est thu feb 19 2026 /300 am cst thu feb 19 2026/

...gale warning in effect until 7 am est /6 am cst/ this
morning...

.early this morning...northeast gales to 35 knots. a chance of
snow showers. waves 7 to 10 feet occasionally to 13 feet. 
.today...northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. a chance of snow showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tonight...northeast winds 15 to 25 knots becoming north 10 to
20 knots by midnight. a chance of snow. waves subsiding to 1 to
3 feet. 
.friday...north winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of snow. waves building to
2 to 4 feet. 
.friday night...north winds 10 to 20 knots. a chance of snow
showers. waves subsiding to 1 to 3 feet. 
.saturday...north winds 10 to 20 knots. a chance of snow showers.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.saturday night...north winds 10 to 20 knots backing northwest
after midnight. waves calm to 2 feet. 
.sunday...north winds 15 to 25 knots. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots veering south. waves calm to
2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 190901
glfls 
expires:202602192100;;890163

open lake forecast for lake superior
national weather service marquette mi
400 am est thu feb 19 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...

29.6 inch low over lake superior this morning weakens to 29.7 inches 
by this evening as a 29.4 inch low over the central plains deepens 
to 29.1 inches before arriving over the western great lakes friday 
morning. troughing increases to 29.6 inches over lake superior on 
friday morning as the low moves through northern lower michigan, 
before the low lifts towards ontario and weakens to 29.5 inches by 
friday evening. remnant troughing over lake superior weakens to 30.0 
inches by saturday morning as ridging builds over the northern 
plains. pressure continues to rise over lake superior saturday 
through monday as the ridging over the northern plains continues to 
push eastwards with time, eventually peaking at 30.5 inches over the 
lake late monday. behind the ridging, a deepening 29.6 inch clipper 
low moves into the northern plains on tuesday.



lsz263-192100-
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 thu feb 19 2026

...gale warning in effect until 7 am est this morning...

.early this morning...east gales to 35 knots. a chance of snow
showers. waves 12 to 17 feet occasionally to 21 feet subsiding to
11 to 15 feet occasionally to 19 feet. 
.today...east gales to 35 knots becoming northeast 20 to 30 knots
by mid afternoon. a chance of snow showers. waves subsiding to
6 to 9 feet occasionally to 11 feet. 
.tonight...northeast winds 15 to 25 knots backing north late. a
chance of snow. waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 4 to 7 feet occasionally to 9 feet. 
.friday...north winds 15 to 25 knots. snow likely in the morning,
then a chance of snow in the afternoon. 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 10 to 20 knots. a chance of snow
showers. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...north winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. a chance of snow showers. waves
subsiding to 2 to 4 feet. 
.saturday night...north winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.sunday...north winds 20 to 30 knots. waves building to 4 to
7 feet occasionally to 9 feet. 
.monday...north winds 15 to 25 knots becoming south 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$