fzus63 kmqt 220201
glfls 
expires:202605220800;;430071

open lake forecast for lake superior
national weather service marquette mi
1000 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... 

remnant high pressure ridging of 30.3 to 30.4 inches remains over 
lake superior tonight into friday as the parent high shifts east 
into new england and quebec. meanwhile, a 29.8 inch low develops 
over the southern plains and lifts toward the lower great lakes. 
simultaneously, another 29.7 inch low lifts over the northern plains 
towards angle inlet. the lows gradually weaken to around 29.9 inches 
as they lift over southern ontario and eastern manitoba saturday 
into sunday, respectively. in response to these lows, weak troughing 
of around 30.0 inches passes northward over lake superior saturday 
night into sunday night, before ridging of around 30.0 inches 
returns on monday. behind this, expect weak troughing of around 29.9 
inches to return to the lake by tuesday morning.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt thu may 21 2026 /900 pm cdt thu may 21 2026/

.rest of tonight...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering east late. waves 1 to
3 feet 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. a slight chance of rain
showers. 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 220201
glfls 
expires:202605220800;;430072

open lake forecast for lake superior
national weather service marquette mi
1000 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... 

remnant high pressure ridging of 30.3 to 30.4 inches remains over 
lake superior tonight into friday as the parent high shifts east 
into new england and quebec. meanwhile, a 29.8 inch low develops 
over the southern plains and lifts toward the lower great lakes. 
simultaneously, another 29.7 inch low lifts over the northern plains 
towards angle inlet. the lows gradually weaken to around 29.9 inches 
as they lift over southern ontario and eastern manitoba saturday 
into sunday, respectively. in response to these lows, weak troughing 
of around 30.0 inches passes northward over lake superior saturday 
night into sunday night, before ridging of around 30.0 inches 
returns on monday. behind this, expect weak troughing of around 29.9 
inches to return to the lake by tuesday morning.



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-
1000 pm edt thu may 21 2026

.rest of tonight...east winds 5 to 15 knots veering southeast
after midnight. waves 1 to 3 feet 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. 

$$