fzus63 kmqt 191501
glfls 
expires:202602192100;;904372

open lake forecast for lake superior
national weather service marquette mi
1000 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-
1000 am est thu feb 19 2026 /900 am cst thu feb 19 2026/

.rest of today...northeast winds 20 to 30 knots diminishing to
15 to 25 knots by mid afternoon. a chance of snow showers. waves
6 to 9 feet occasionally to 11 feet 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 2 to
4 feet. 
.friday...north winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of snow. waves building to
3 to 6 feet occasionally to 8 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 1 to 3 feet. 
.saturday night...north winds 10 to 20 knots backing northwest
after midnight. waves subsiding to calm to 2 feet. 
.sunday...north winds 15 to 25 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.monday...north winds 5 to 15 knots veering south. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 191501
glfls 
expires:202602192100;;904373

open lake forecast for lake superior
national weather service marquette mi
1000 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-
1000 am est thu feb 19 2026

.rest of today...east winds to 30 knots with a few gale force
gusts to 35 knots possible becoming northeast 20 to 30 knots by
mid afternoon. a chance of snow showers. waves 10 to 14 feet
occasionally to 18 feet 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 6 feet occasionally to
8 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 5 to
8 feet occasionally to 10 feet. 
.monday...north winds 15 to 25 knots becoming south 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$