fzus63 kmqt 211401
glfls 
expires:202605212000;;402802

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu may 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 30.4 inch high pressure remains over lake superior today before 
shifting east through friday into new england and quebec. meanwhile, 
a 29.7 inch low develops over the plains and lifts toward the great 
lakes. the low gradually weakens to 29.9 inches as it lifts over 
lower michigan and the eastern great lakes saturday into sunday. 
weak troughing of 30.0 inches passes northward over lake superior 
saturday night into sunday before ridging of around 30.0 inches 
returns on monday.



lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt thu may 21 2026 /900 am cdt thu may 21 2026/

.rest of today...east winds 5 to 15 knots becoming northeast
10 to 20 knots late. waves calm to 2 feet building to 1 to
3 feet. 
.tonight...northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. waves subsiding
to calm to 2 feet. 
.friday...east winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of rain showers. waves
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. waves
subsiding to 1 to 3 feet. 
.saturday night...northeast winds 5 to 15 knots becoming west
less than 10 knots after midnight. waves subsiding to calm to
2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots backing northeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202605212000;;402803

open lake forecast for lake superior
national weather service marquette mi
1000 am edt thu may 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 30.4 inch high pressure remains over lake superior today before 
shifting east through friday into new england and quebec. meanwhile, 
a 29.7 inch low develops over the plains and lifts toward the great 
lakes. the low gradually weakens to 29.9 inches as it lifts over 
lower michigan and the eastern great lakes saturday into sunday. 
weak troughing of 30.0 inches passes northward over lake superior 
saturday night into sunday before ridging of around 30.0 inches 
returns on monday.



lsz263-212000-
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 edt thu may 21 2026

.rest of today...southeast winds less than 10 knots becoming
northeast 5 to 15 knots in the afternoon. waves calm to 2 feet
building to 1 to 3 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 3 to 5 feet occasionally to 7 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of rain showers after midnight.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots. rain showers through early
afternoon, then a chance of rain showers by mid afternoon. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...east winds 5 to 15 knots veering west after
midnight. waves subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.monday...southwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 

$$