fzus63 kmqt 121401
glfls 
expires:202604122000;;245383

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sun apr 12 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 29.4 inch low over the northern plains this morning lifts 
northeast through northwestern lake superior late this afternoon 
before moving into far northern quebec by monday morning. another 
29.5 inch low then takes shape over the central plains on monday 
before lifting through the straits of mackinac at 29.6 inches 
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



lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sun apr 12 2026 /900 am cdt sun apr 12 2026/

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

$$

fzus63 kmqt 121401
glfls 
expires:202604122000;;245384

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sun apr 12 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 29.4 inch low over the northern plains this morning lifts 
northeast through northwestern lake superior late this afternoon 
before moving into far northern quebec by monday morning. another 
29.5 inch low then takes shape over the central plains on monday 
before lifting through the straits of mackinac at 29.6 inches 
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



lsz263-122000-
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 am edt sun apr 12 2026

.rest of today...southeast winds 10 to 20 knots veering south
late. a chance of showers and thunderstorms. waves 3 to 5 feet
occasionally to 7 feet subsiding to 2 to 4 feet. 
.tonight...southwest winds 5 to 15 knots veering west after
midnight. a chance of rain showers and a slight chance of
thunderstorms through midnight. waves subsiding to calm to
2 feet. 
.monday...northwest winds 5 to 15 knots becoming northeast less
than 10 knots in the afternoon, then becoming east 5 to 15 knots
late. a slight chance of rain showers by mid afternoon. waves
calm to 2 feet. 
.monday night...east winds 10 to 20 knots backing northeast after
midnight. rain showers likely and a slight chance of
thunderstorms through midnight, then a chance of rain showers
after midnight. waves building to 2 to 4 feet. 
.tuesday...northeast winds 5 to 15 knots. a slight chance of rain
showers through early afternoon. waves subsiding to calm to
2 feet. 
.tuesday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...east winds 5 to 15 knots backing northeast. a chance
of rain showers. waves building to 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming east 15 to
25 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 

$$