fzus63 kmqt 202001
glfls 
expires:202605210800;;362760

open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed may 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 30.3 inch high over the upper great lakes rises to 30.4 inches 
tonight. the high pressure then shifts east through friday to new 
england and quebec, but ridging of at least 30.3 inches remains over 
lake superior. meanwhile, a 29.7 inch low develops over the southern 
plains and lifts toward the great lakes. the low gradually weakens 
to 30.0 inches as it lifts over lower michigan and lake huron 
saturday into sunday. weak troughing of 29.9 to 30.0 inches passes 
northward over lake superior saturday night into sunday before high 
pressure around 30.0 inches returns on monday.



lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt wed may 20 2026 /300 pm cdt wed may 20 2026/

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots backing east after
midnight. waves calm to 2 feet. 
.thursday...southeast winds 5 to 15 knots backing east in the
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots veering east
late. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.friday night...northeast 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 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.saturday...northeast winds 10 to 20 knots. rain showers likely
through early afternoon, then a chance of rain showers by mid
afternoon. waves 2 to 4 feet. 
.saturday night...northeast winds 5 to 15 knots backing north
after midnight. a chance of rain showers. 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. waves calm to 2 feet. 

$$

fzus63 kmqt 202001
glfls 
expires:202605210800;;362761

open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed may 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 30.3 inch high over the upper great lakes rises to 30.4 inches 
tonight. the high pressure then shifts east through friday to new 
england and quebec, but ridging of at least 30.3 inches remains over 
lake superior. meanwhile, a 29.7 inch low develops over the southern 
plains and lifts toward the great lakes. the low gradually weakens 
to 30.0 inches as it lifts over lower michigan and lake huron 
saturday into sunday. weak troughing of 29.9 to 30.0 inches passes 
northward over lake superior saturday night into sunday before high 
pressure around 30.0 inches returns on monday.



lsz263-210800-
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 edt wed may 20 2026

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming south 5 to 15 knots late.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing northeast in the
afternoon, then veering east late. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots. rain showers likely. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...east winds 5 to 15 knots veering southwest
after midnight. a chance of rain showers. 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. waves calm to 2 feet. 

$$