fzus63 kmqt 232001
glfls 
expires:202605240800;;528050

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat may 23 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 is currently between a 30.5 inch high centered over 
eastern quebec and a pair of 29.9 inch lows, one over northern ohio 
and one over northern minnesota. into the evening, the lows weaken 
to remnant 30.0 inch troughs over the upper great lakes while the 
high shifts over nova scotia. sunday, lake superior will be between 
the high, now off the canada coast, and broad 29.6 inch low pressure 
over saskatchewan. a 30.1 inch ridge forms monday over the lower 
great lakes as the low retreats to alberta. monday night, a 29.8 
inch trough will be over northern ontario, extending 29.9 inch 
troughing over the lake. by tuesday night, a 30.2 inch high over the 
western shores of hudson bay will extend weak ridging over lake 
superior with 29.4 inch troughing forming in the lee of the northern 
us rockies. pressure rises over the lake as the high shifts 
southeast over northern ontario while low pressure over the west 
weakens on wednesday.



lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sat may 23 2026 /300 pm cdt sat may 23 2026/

.late this afternoon...northeast winds 10 to 20 knots. a chance
of rain showers. waves 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots veering southwest late.
a slight chance of rain showers through midnight. patchy dense
fog. waves subsiding to calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots backing south late. a
slight chance of showers and thunderstorms by mid afternoon.
waves calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.monday...south winds 5 to 15 knots backing east by mid
afternoon. a slight chance of showers and thunderstorms by mid
afternoon. waves calm to 2 feet. 
.monday night...north winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday night...east winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves calm to 2 feet. 
.wednesday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.thursday...northeast winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202605240800;;528051

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sat may 23 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 is currently between a 30.5 inch high centered over 
eastern quebec and a pair of 29.9 inch lows, one over northern ohio 
and one over northern minnesota. into the evening, the lows weaken 
to remnant 30.0 inch troughs over the upper great lakes while the 
high shifts over nova scotia. sunday, lake superior will be between 
the high, now off the canada coast, and broad 29.6 inch low pressure 
over saskatchewan. a 30.1 inch ridge forms monday over the lower 
great lakes as the low retreats to alberta. monday night, a 29.8 
inch trough will be over northern ontario, extending 29.9 inch 
troughing over the lake. by tuesday night, a 30.2 inch high over the 
western shores of hudson bay will extend weak ridging over lake 
superior with 29.4 inch troughing forming in the lee of the northern 
us rockies. pressure rises over the lake as the high shifts 
southeast over northern ontario while low pressure over the west 
weakens on wednesday.



lsz263-240800-
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 sat may 23 2026

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

$$