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open lake forecast for lake superior
national weather service marquette mi
1000 pm edt mon mar 16 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...

lake superior will be between a 29.2 inch low departing into quebec 
and a 30.3 inch high over the great plains tonight. the high shifts 
south of the great lakes basin on tuesday, extending weak 30.0 inch 
ridging over the lake. a 29.7 inch trough over the canadian prairie 
wednesday morning will begin to push towards the lake on wednesday, 
weakening to 29.8 inches over northwest ontario wednesday night. 
weak ridging of around 30.1 inches will build over the lake on 
thursday ahead of the next clipper low approaching the region on 
friday at around 29.7 inches.



lsz162-170800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt mon mar 16 2026 /900 pm cdt mon mar 16 2026/

...heavy freezing spray warning in effect until 2 am edt /1 am
cdt/ tuesday...

.rest of tonight...north winds 20 to 30 knots diminishing to
15 to 25 knots late. heavy freezing spray by midnight. waves 5 to
8 feet occasionally to 10 feet subsiding to 2 to 4 feet. 
.tuesday...northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. a slight
chance of snow showers by mid afternoon. waves subsiding to calm
to 2 feet. 
.tuesday night...south winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. a chance of
snow showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.wednesday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.wednesday night...southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. a slight chance of snow showers
through midnight. a slight chance of rain showers. waves
subsiding to calm to 2 feet. 
.thursday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots.
a chance of snow showers, possibly mixed with rain. waves
building to 4 to 7 feet occasionally to 9 feet. 
.saturday...northwest winds 15 to 25 knots becoming north 20 to
30 knots. a chance of snow showers, possibly mixed with rain.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet. 

$$