fzus63 kmqt 300801
glfls 
expires:202608302000;;596490

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun aug 30 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 29.6 inch low over the central and northern plains this morning 
lifts north into the canadian prairies the rest of today into 
tonight. the then 29.4 inch low over the canadian prairies on monday 
is projected to bring 29.8 inch troughing over lake superior by late 
in the day. weak high pressure ridging of 29.9 inches looks to make 
a quick return on tuesday before being replaced by weak 29.8 inch 
troughing tuesday evening. weak ridging of around 29.9 inches then 
returns to the lake on wednesday, strengthening to 30.0 inches 
wednesday night into thursday morning. 




lsz162-302000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun aug 30 2026 /301 am cdt sun aug 30 2026/

.early this morning...northeast winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...northeast winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. patchy fog. a slight chance of
showers. waves building to 2 to 4 feet. 
.tonight...northeast winds 20 to 30 knots veering east after
midnight, then diminishing to 10 to 20 knots late. patchy fog. a
chance of showers and a slight chance of thunderstorms. waves
subsiding to 1 to 3 feet. 
.monday...east winds 5 to 15 knots becoming west 10 to 20 knots
in the afternoon, then backing southwest late. a slight chance of
showers and thunderstorms through early afternoon. waves
subsiding to calm to 2 feet. 
.monday night...west winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. waves calm to 2 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots veering northeast.
waves calm to 2 feet. 
.thursday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 300801
glfls 
expires:202608302000;;596491

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun aug 30 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 29.6 inch low over the central and northern plains this morning 
lifts north into the canadian prairies the rest of today into 
tonight. the then 29.4 inch low over the canadian prairies on monday 
is projected to bring 29.8 inch troughing over lake superior by late 
in the day. weak high pressure ridging of 29.9 inches looks to make 
a quick return on tuesday before being replaced by weak 29.8 inch 
troughing tuesday evening. weak ridging of around 29.9 inches then 
returns to the lake on wednesday, strengthening to 30.0 inches 
wednesday night into thursday morning. 




lsz263-302000-
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-
401 am edt sun aug 30 2026

.early this morning...east winds 5 to 15 knots. patchy fog. waves
calm to 2 feet. 
.today...east winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon. patchy fog. a slight chance of showers
by mid afternoon. waves building to 2 to 4 feet. 
.tonight...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. patchy fog. a chance of showers. a
slight chance of thunderstorms after midnight. waves subsiding to
1 to 3 feet. 
.monday...southeast winds 10 to 20 knots veering south in the
afternoon, then becoming west 5 to 15 knots late. patchy dense
fog through early afternoon. a chance of showers and a slight
chance of thunderstorms. waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.monday night...west winds 5 to 15 knots backing southwest after
midnight. a slight chance of showers after midnight. waves
subsiding to calm to 2 feet. 
.tuesday...southwest winds 15 to 25 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north less
than 10 knots. waves calm to 2 feet. 
.thursday...northeast winds 10 to 20 knots veering east. waves
calm to 2 feet. 

$$