fzus63 kmqt 130801
glfls 
expires:202604132000;;286500

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 13 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 29.5 inch low then takes shape over the central plains today 
before lifting through the straits of mackinac at 29.6 inches 
through tuesday morning. weak ridging of 29.9 to 30.0 inches moves 
back over lake superior from northern ontario tuesday evening 
through wednesday before another low from the central plains lifts 
through the upper great lakes at 29.6 inches on thursday. behind 
this low, yet another low at around 29.5 inches moves into lake 
superior on friday into saturday.



lsz162-132000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt mon apr 13 2026 /300 am cdt mon apr 13 2026/

...dense fog advisory in effect until 11 am edt /10 am cdt/ this
morning...

.early this morning...west winds 5 to 15 knots. patchy dense fog.
waves calm to 2 feet. 
.today...west winds 5 to 15 knots veering north in the afternoon,
then veering east late. patchy dense fog through early afternoon.
a slight chance of showers and thunderstorms by mid afternoon.
waves calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
a slight chance of thunderstorms through midnight. a chance of
rain showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.tuesday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots late. a chance of rain showers. a slight chance of snow
showers by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...northeast winds 5 to 15 knots. waves calm to 2 feet.
.wednesday night...northeast winds 5 to 15 knots. a chance of
rain showers. waves building to 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming east 10 to
20 knots. a chance of rain showers. waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.friday...northeast winds 10 to 20 knots becoming northwest 20 to
30 knots. rain showers likely, possibly mixed with snow showers.
waves building to 4 to 7 feet occasionally to 9 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202604132000;;286501

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 13 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 29.5 inch low then takes shape over the central plains today 
before lifting through the straits of mackinac at 29.6 inches 
through tuesday morning. weak ridging of 29.9 to 30.0 inches moves 
back over lake superior from northern ontario tuesday evening 
through wednesday before another low from the central plains lifts 
through the upper great lakes at 29.6 inches on thursday. behind 
this low, yet another low at around 29.5 inches moves into lake 
superior on friday into saturday.



lsz263-132000-
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 mon apr 13 2026

...dense fog advisory in effect until 11 am edt this morning...

.early this morning...west winds 5 to 15 knots. areas of dense
fog. waves 1 to 3 feet. 
.today...west winds 5 to 15 knots becoming northwest less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
patchy dense fog through early afternoon. waves subsiding to calm
to 2 feet. 
.tonight...east winds 10 to 20 knots backing northeast late. a
slight chance of thunderstorms through midnight. a chance of rain
showers. waves building to 2 to 4 feet. 
.tuesday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. a slight chance of rain showers. waves
subsiding to 1 to 3 feet. 
.tuesday night...northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight. waves subsiding to calm to
2 feet. 
.wednesday...northeast winds less than 10 knots increasing to
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots backing northeast
after midnight. a chance of rain showers. waves building to 1 to
3 feet. 
.thursday...northeast winds 5 to 15 knots becoming east 10 to
20 knots. a chance of rain showers. waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.friday...east winds 15 to 25 knots becoming west 20 to 30 knots.
a chance of rain showers, then rain showers likely, possibly
mixed with snow showers. waves building to 7 to 10 feet
occasionally to 13 feet. 

$$