fzus63 kmqt 212101
glfls 
expires:202602220900;;031542

open lake forecast for lake superior
national weather service marquette mi
400 pm est sat feb 21 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 29.9 inch low over lake huron this afternoon gradually weakens to 
30.0 inches by tonight, remaining mostly stationary. meanwhile, 31.2 
inch high pressure builds over northern saskatchewan. through 
sunday, the low is gradually absorbed into a 28.9 inch nor'easter 
off the delmarva peninsula as high pressure slides over manitoba at 
31.0 inches, extending 30.7 inch ridging over western lake superior. 
the high weakens slightly to 30.7 inches over northern ontario by 
monday afternoon before sharply weakening to 30.2 inches over the 
ontario/quebec line tuesday morning. meanwhile, broad 29.8 inch low 
pressure forms over the plains, sending at least one low of around 
29.5 inches through the great lakes basin during the midweek period. 
weak ridging then builds over lake superior at around 29.9 inches 
for thursday before the next clipper low approaches lake superior 
from the nw for friday.



lsz162-220900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est sat feb 21 2026 /300 pm cst sat feb 21 2026/

.late this afternoon...northwest winds 15 to 25 knots. waves 1 to
3 feet. 
.tonight...northwest winds 15 to 25 knots veering north by
midnight, then increasing to 20 to 30 knots late. a slight chance
of snow showers. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.sunday...north winds 20 to 30 knots. a slight chance of snow
showers. waves building to 3 to 6 feet occasionally to 8 feet. 
.sunday night...north winds 20 to 30 knots diminishing to 10 to
20 knots. a chance of snow showers. waves subsiding to 2 to
4 feet. 
.monday...northeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon. a slight chance of snow showers in the
morning. waves subsiding to calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight. a chance of snow showers. waves
building to 1 to 3 feet. 
.tuesday...south winds 10 to 20 knots veering southwest in the
afternoon. snow showers likely in the morning, then a chance of
snow showers in the afternoon. waves building to 2 to 4 feet,
then subsiding to calm to 2 feet. 
.tuesday night...northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves 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. 
.thursday...southwest winds 10 to 20 knots. waves building to
1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 212101
glfls 
expires:202602220900;;031543

open lake forecast for lake superior
national weather service marquette mi
400 pm est sat feb 21 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 29.9 inch low over lake huron this afternoon gradually weakens to 
30.0 inches by tonight, remaining mostly stationary. meanwhile, 31.2 
inch high pressure builds over northern saskatchewan. through 
sunday, the low is gradually absorbed into a 28.9 inch nor'easter 
off the delmarva peninsula as high pressure slides over manitoba at 
31.0 inches, extending 30.7 inch ridging over western lake superior. 
the high weakens slightly to 30.7 inches over northern ontario by 
monday afternoon before sharply weakening to 30.2 inches over the 
ontario/quebec line tuesday morning. meanwhile, broad 29.8 inch low 
pressure forms over the plains, sending at least one low of around 
29.5 inches through the great lakes basin during the midweek period. 
weak ridging then builds over lake superior at around 29.9 inches 
for thursday before the next clipper low approaches lake superior 
from the nw for friday.



lsz263-220900-
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 sat feb 21 2026

...heavy freezing spray warning in effect from sunday morning
through late sunday night...

.late this afternoon...northwest winds 10 to 20 knots. a chance
of snow showers. waves 1 to 3 feet. 
.tonight...north winds 15 to 25 knots. a chance of snow showers.
waves building to 4 to 7 feet occasionally to 9 feet. 
.sunday...north winds 20 to 30 knots. heavy freezing spray. a
chance of snow showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.sunday night...north winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots late.
heavy freezing spray. a slight chance of snow showers. 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 15 to 25 knots becoming northeast 5 to
15 knots in the afternoon. a slight chance of snow showers in the
morning. waves subsiding to 1 to 3 feet. 
.monday night...east winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. a chance of snow showers after midnight.
waves subsiding to calm to 2 feet, then building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. snow showers likely in the morning,
then a chance of snow showers in the afternoon. waves 2 to
4 feet. 
.tuesday night...northwest winds 10 to 20 knots. waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
6 feet occasionally to 8 feet. 
.wednesday...northwest winds 10 to 20 knots veering north. waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.thursday...southwest winds 10 to 20 knots increasing to 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$