fzus63 kmqt 151401
glfls 
expires:202603152000;;717566

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sun mar 15 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...

throughout today, a 29.3 inch low deepens to 29.1 inches as it moves 
from southeast iowa to over the michigan lower peninsula. the low 
then slowly shifts over northern lake huron by monday afternoon, 
maintaining near 29.1 inches. by monday night, lake superior will be 
between the low as it shifts into quebec and a 30.3 inch high over 
the northern plains. this low shifts south of the great lakes basin 
through tuesday, extending weak 30.0 inch ridging over lake 
superior. wednesday morning, 29.5 inch low pressure over the 
canadian prairie will begin to push towards the lake, weakening to 
29.8 inches over the western end of the lake wednesday night. weak 
ridging of around 30.1 inches will be over the lake thursday evening 
ahead of the next clipper low moving over northern ontario by friday 
afternoon at around 29.6 inches.



lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sun mar 15 2026 /900 am cdt sun mar 15 2026/

...gale warning in effect until 8 pm edt /7 pm cdt/ this
evening...
...heavy freezing spray warning in effect through late monday
night...
...storm warning in effect from 8 pm edt /7 pm cdt/ this evening
through monday morning...

.rest of today...northeast gales to 45 knots. freezing spray.
snow. waves 8 to 11 feet occasionally to 14 feet building to
12 to 17 feet occasionally to 21 feet. 
.tonight...north gales to 45 knots increasing to storm force
winds to 50 knots late. heavy freezing spray. a chance of snow.
waves building to 15 to 20 feet occasionally to 25 feet. 
.monday...north storm force winds to 50 knots diminishing to
gales to 45 knots in the afternoon. heavy freezing spray. a
slight chance of snow. waves subsiding to 6 to 9 feet
occasionally to 11 feet. 
.monday night...north gales to 35 knots diminishing to 15 to
25 knots after midnight. heavy freezing spray through midnight.
waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...south winds 15 to 25 knots veering southwest
after midnight. snow showers likely through midnight, then a
chance of snow showers after midnight. waves building to 2 to
4 feet. 
.wednesday...southwest winds 10 to 20 knots veering west. a
chance of rain and snow showers. waves subsiding to calm to
2 feet. 
.thursday...south winds 5 to 15 knots veering southwest. a chance
of rain and snow showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 151401
glfls 
expires:202603152000;;717567

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sun mar 15 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...

throughout today, a 29.3 inch low deepens to 29.1 inches as it moves 
from southeast iowa to over the michigan lower peninsula. the low 
then slowly shifts over northern lake huron by monday afternoon, 
maintaining near 29.1 inches. by monday night, lake superior will be 
between the low as it shifts into quebec and a 30.3 inch high over 
the northern plains. this low shifts south of the great lakes basin 
through tuesday, extending weak 30.0 inch ridging over lake 
superior. wednesday morning, 29.5 inch low pressure over the 
canadian prairie will begin to push towards the lake, weakening to 
29.8 inches over the western end of the lake wednesday night. weak 
ridging of around 30.1 inches will be over the lake thursday evening 
ahead of the next clipper low moving over northern ontario by friday 
afternoon at around 29.6 inches.



lsz263-152000-
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 mar 15 2026

...gale warning in effect until 8 pm edt this evening...
...heavy freezing spray warning in effect from 2 pm edt this
afternoon through tuesday afternoon...
...storm warning in effect from 8 pm edt this evening through
monday afternoon...

.rest of today...northeast gales to 45 knots. freezing spray.
snow. waves 6 to 9 feet occasionally to 11 feet building to 12 to
17 feet occasionally to 21 feet. 
.tonight...northeast gales to 45 knots becoming north storm force
winds to 55 knots after midnight. heavy freezing spray. a chance
of snow. waves building to 17 to 22 feet occasionally to 28 feet.
.monday...north storm force winds to 55 knots diminishing to
gales to 45 knots in the afternoon. heavy freezing spray. a
chance of snow. waves subsiding to 10 to 14 feet occasionally to
18 feet. 
.monday night...north gales to 45 knots. heavy freezing spray.
waves subsiding to 4 to 7 feet occasionally to 9 feet. 
.tuesday...northwest winds 15 to 25 knots becoming southwest 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...south winds 15 to 25 knots. a chance of snow
showers. waves building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of snow showers. waves subsiding to 1 to
3 feet, then building to 2 to 4 feet. 
.thursday...southwest winds 5 to 15 knots becoming south 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 

$$