fzus63 kmqt 201501
glfls 
expires:202602202100;;962308

open lake forecast for lake superior
national weather service marquette mi
1000 am est fri feb 20 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...

a 29.2 inch low over lake michigan this morning traverses northern 
lower michigan and lake huron this afternoon and evening, 
progressively weakening to 29.5 inches as it does so. the low 
continues to weaken saturday, devolving into bent back troughing of 
30.2 inches over the upper great lakes by sunday morning. troughing 
continues to weaken sunday as a 31.0 inch high moves across 
manitoba. this high weakens to 30.5 inches as it moves through 
northern ontario monday. behind the ridge monday night and tuesday, 
a deepening clipper low of at least 29.6 inches moves into the 
northern plains, reaching the u.p. tuesday evening. troughing around 
29.7 inches remains over lake superior through wednesday as a 29.5 
inch low tracks to the south.



lsz162-202100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est fri feb 20 2026 /900 am cst fri feb 20 2026/

.rest of today...north winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of snow. waves 3 to 5 feet
occasionally to 7 feet. 
.tonight...northwest winds 10 to 20 knots. a slight 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 increasing to
15 to 25 knots after midnight. a slight chance of snow showers.
waves building to 1 to 3 feet. 
.sunday...north winds 15 to 25 knots. waves 1 to 3 feet. 
.sunday night...north winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves 1 to 3 feet. 
.monday...north winds 10 to 20 knots veering southeast. waves
subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots veering west. a chance of
snow showers. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 201501
glfls 
expires:202602202100;;962309

open lake forecast for lake superior
national weather service marquette mi
1000 am est fri feb 20 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...

a 29.2 inch low over lake michigan this morning traverses northern 
lower michigan and lake huron this afternoon and evening, 
progressively weakening to 29.5 inches as it does so. the low 
continues to weaken saturday, devolving into bent back troughing of 
30.2 inches over the upper great lakes by sunday morning. troughing 
continues to weaken sunday as a 31.0 inch high moves across 
manitoba. this high weakens to 30.5 inches as it moves through 
northern ontario monday. behind the ridge monday night and tuesday, 
a deepening clipper low of at least 29.6 inches moves into the 
northern plains, reaching the u.p. tuesday evening. troughing around 
29.7 inches remains over lake superior through wednesday as a 29.5 
inch low tracks to the south.



lsz263-202100-
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 fri feb 20 2026

.rest of today...north winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then diminishing to 15 to 25 knots by
mid afternoon. freezing spray. snow. waves 4 to 8 feet
occasionally to 10 feet. 
.tonight...north winds 10 to 20 knots. freezing spray in the
evening. 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 by mid afternoon. a chance of snow showers. waves
subsiding to 1 to 3 feet. 
.saturday night...north winds 10 to 20 knots. a slight chance of
snow showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.sunday...north winds 15 to 25 knots. a slight chance of snow
showers in the morning. waves building to 4 to 7 feet
occasionally to 9 feet. 
.sunday night...north winds 20 to 30 knots. heavy freezing spray.
waves building to 5 to 8 feet occasionally to 10 feet. 
.monday...north winds 15 to 25 knots veering south. waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday...south winds 15 to 25 knots veering west. a chance of
snow showers. waves building to 4 to 7 feet occasionally to
9 feet. 

note, wave height forecasts are for ice free areas.

$$