fzus63 kmqt 230801
glfls 
expires:202605232000;;499057

open lake forecast for lake superior
national weather service marquette mi
400 am 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 30.6 inch high over quebec and 
a pair of 29.9 inch lows, one south of the michigan lower peninsula 
and one over the east half of the dakotas. through today, 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, with the high slowly 
moving southeast tuesday. 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.



lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sat may 23 2026 /300 am cdt sat may 23 2026/

.early this morning...east winds 10 to 20 knots. a chance of rain
showers. waves 2 to 4 feet. 
.today...east winds 10 to 20 knots backing northeast in the
afternoon. rain showers likely through early afternoon, then a
chance of rain showers by mid afternoon. waves subsiding to 1 to
3 feet. 
.tonight...northeast winds 5 to 15 knots backing north after
midnight, then becoming west less than 10 knots late. a slight
chance of rain showers through midnight. 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...southwest winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...north winds 5 to 15 knots diminishing to less
than 10 knots after midnight. waves calm to 2 feet. 
.tuesday...east winds 5 to 15 knots backing northeast. 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. 

$$

fzus63 kmqt 230801
glfls 
expires:202605232000;;499058

open lake forecast for lake superior
national weather service marquette mi
400 am 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 30.6 inch high over quebec and 
a pair of 29.9 inch lows, one south of the michigan lower peninsula 
and one over the east half of the dakotas. through today, 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, with the high slowly 
moving southeast tuesday. 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.



lsz263-232000-
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 am edt sat may 23 2026

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

$$