fzus63 kmqt 210901
glfls 
expires:202602212100;;003743

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.7 inch low over lake huron this morning gradually weakens to 
30.0 inches by tonight as it slowly meanders into southern ontario. 
meanwhile, 31.2 inch high pressure builds over northern 
saskatchewan. through sunday, the low is gradually absorbed into a 
29.1 inch nor'easter off the delmarva peninsula as high pressure 
slides over manitoba at 31.0 inches, extending 30.6 inch ridging 
over western lake superior. the high weakens slightly to 30.8 inches 
over northern ontario by monday afternoon before sharply weakening 
to 30.3 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.



lsz162-212100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est sat feb 21 2026 /300 am cst sat feb 21 2026/

.early this morning...northwest winds 10 to 20 knots. a slight
chance of snow showers. waves 1 to 3 feet. 
.today...northwest winds 10 to 20 knots. a slight chance of snow
showers. 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 in the evening. waves building to 3 to 5 feet
occasionally to 7 feet. 
.sunday...north winds 20 to 30 knots. a slight chance of snow
showers in the morning. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...north winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves 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 becoming south
10 to 20 knots after midnight. a chance of snow showers. waves
building to 1 to 3 feet. 
.tuesday...south winds 10 to 20 knots veering west. a chance of
snow showers. waves building to 2 to 4 feet, then subsiding to
calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots. a chance of snow
showers. waves building to 2 to 4 feet, then subsiding to calm to
2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 210901
glfls 
expires:202602212100;;003744

open lake forecast for lake superior
national weather service marquette mi
400 am 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 29.7 inch low over lake huron this morning gradually weakens to 
30.0 inches by tonight as it slowly meanders into southern ontario. 
meanwhile, 31.2 inch high pressure builds over northern 
saskatchewan. through sunday, the low is gradually absorbed into a 
29.1 inch nor'easter off the delmarva peninsula as high pressure 
slides over manitoba at 31.0 inches, extending 30.6 inch ridging 
over western lake superior. the high weakens slightly to 30.8 inches 
over northern ontario by monday afternoon before sharply weakening 
to 30.3 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.



lsz263-212100-
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 sat feb 21 2026

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

.early this morning...northwest winds 10 to 20 knots. a chance of
snow showers. waves 2 to 4 feet. 
.today...north winds 10 to 20 knots diminishing to 5 to 15 knots
by late morning, then backing northwest by mid afternoon. a
chance of snow showers. waves subsiding to 1 to 3 feet. 
.tonight...north winds 10 to 20 knots increasing to 15 to
25 knots by midnight. a chance of snow showers. waves building to
3 to 6 feet occasionally to 8 feet. 
.sunday...north winds 20 to 30 knots. heavy freezing spray. a
slight chance of snow showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.sunday night...north gales to 35 knots. 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 diminishing to 5 to 15 knots
in the afternoon. waves subsiding to 1 to 3 feet. 
.monday night...east winds 5 to 15 knots becoming south 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 10 to 20 knots becoming west 15 to
25 knots. a chance of snow showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.wednesday...northwest winds 10 to 20 knots increasing to 15 to
25 knots. a chance of snow showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$