fzus63 kmqt 202101
glfls 
expires:202602210900;;977197

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 29.4 inch low over upper lower michigan will move to lake huron 
this 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.



lsz162-210900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est fri feb 20 2026 /300 pm cst fri feb 20 2026/

.late this afternoon...northwest winds 15 to 25 knots. a slight
chance of snow. waves 3 to 5 feet occasionally to 7 feet. 
.tonight...northwest winds 10 to 20 knots. a slight chance of
snow. waves subsiding to 1 to 3 feet. 
.saturday...northwest winds 10 to 20 knots. a slight chance of
snow. waves subsiding to calm to 2 feet. 
.saturday night...northwest winds 10 to 20 knots becoming north
15 to 25 knots by midnight, then becoming northwest 20 to
30 knots late. a slight chance of snow. waves building to 1 to
3 feet. 
.sunday...north winds 15 to 25 knots. a slight chance of snow
showers in the morning. waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.sunday night...north winds 15 to 25 knots. waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.monday...north winds 10 to 20 knots becoming east 5 to 15 knots
in the afternoon. waves subsiding to calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a chance of snow showers. waves building
to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming west 10 to
20 knots. snow showers likely, then a chance of snow showers.
waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 202101
glfls 
expires:202602210900;;977198

open lake forecast for lake superior
national weather service marquette mi
400 pm 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 29.4 inch low over upper lower michigan will move to lake huron 
this 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.



lsz263-210900-
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 pm est fri feb 20 2026

.late this afternoon...north winds 15 to 25 knots. freezing
spray. snow. waves 4 to 8 feet occasionally to 10 feet. 
.tonight...north winds 10 to 20 knots backing northwest by
midnight. freezing spray in the evening. snow in the evening,
then a chance of snow after midnight. waves subsiding to 2 to
4 feet. 
.saturday...north winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of snow. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet. 
.saturday night...north winds 10 to 20 knots increasing to 15 to
25 knots by midnight. a chance of snow. waves building to 3 to
6 feet occasionally to 8 feet. 
.sunday...north winds 15 to 25 knots increasing to gales to
35 knots in the afternoon. a slight chance of snow showers. waves
building to 4 to 7 feet occasionally to 9 feet. 
.sunday night...north gales to 35 knots diminishing to 20 to
30 knots after midnight. heavy freezing spray. waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 5 to
8 feet occasionally to 10 feet. 
.monday...north winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.monday night...east winds 5 to 15 knots becoming southeast 15 to
25 knots after midnight. a chance of snow showers. waves
subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots veering west. snow showers
likely, then a chance of snow showers. freezing spray. waves
building to 4 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 10 to 20 knots. waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.

note, wave height forecasts are for ice free areas.

$$