fzus63 kmqt 212001
glfls 
expires:202605220800;;417106

open lake forecast for lake superior
national weather service marquette mi
400 pm 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight 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 night before 
ridging of around 30.0 inches returns on monday.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt thu may 21 2026 /300 pm cdt thu may 21 2026/

.late this afternoon...northeast winds 10 to 20 knots. waves 1 to
3 feet building to 2 to 4 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, then increasing to 20 to 30 knots
late. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. a slight chance of rain showers through
midnight, then rain showers likely after midnight. waves
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots backing northeast by mid
afternoon. rain showers 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 north
less than 10 knots after midnight. waves subsiding to calm to
2 feet. 
.sunday...southwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots backing north after
midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots backing north. waves calm to
2 feet. 
.tuesday...southwest winds 5 to 15 knots backing northeast. waves
calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417107

open lake forecast for lake superior
national weather service marquette mi
400 pm 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight 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 night before 
ridging of around 30.0 inches returns on monday.



lsz263-220800-
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 thu may 21 2026

.late this afternoon...east winds 10 to 20 knots. 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 likely. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...east winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.monday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing east. waves calm
to 2 feet. 

$$