fzus63 kmqt 310201
glfls 
expires:202603310800;;565476

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt mon mar 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 29.8 inch trough over the southern great lakes will move eastward 
through tuesday as high pressure approaches the upper great lakes. 
on wednesday morning a 30.4 inch high pressure will be over lake 
superior, with the center of the high over james bay at 30.6 inches. 
by thursday morning, the high builds to 30.8 inches while a 29.5 
inch low develops over the central plains. this low passes just 
south of lake superior at 29.7 inches overnight into friday morning 
while another low of 29.6 inches develops over the oklahoma 
panhandle. this low approaches the bay of green bay saturday 
afternoon, tracking over eastern lake superior at near 29.4 inches 
by sunday morning.



lsz162-310800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt mon mar 30 2026 /900 pm cdt mon mar 30 2026/

.rest of tonight...northeast winds 20 to 30 knots diminishing to
15 to 25 knots late. a slight chance of snow showers by midnight.
a chance of rain showers. snow showers likely after midnight.
waves 4 to 7 feet occasionally to 9 feet. 
.tuesday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. a chance of snow showers, possibly mixed with
rain. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday night...northeast winds 10 to 20 knots. a slight chance
of snow showers through midnight. waves subsiding to 1 to 3 feet.
.wednesday...east winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...east winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a slight chance of snow showers. waves
building to 5 to 8 feet occasionally to 10 feet. 
.thursday...east gales to 35 knots becoming northeast gales to
45 knots by mid afternoon. a chance of snow showers through early
afternoon, then snow showers likely by mid afternoon. waves
building to 11 to 15 feet occasionally to 19 feet. 
.thursday night...northeast gales to 35 knots diminishing to
20 to 30 knots after midnight. snow showers. waves subsiding to
7 to 10 feet occasionally to 13 feet. 
.friday...northeast winds 15 to 25 knots becoming east 20 to
30 knots. a chance of snow showers. waves subsiding to 4 to
7 feet occasionally to 9 feet, then building to 6 to 9 feet
occasionally to 11 feet. 
.saturday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. snow showers likely. a chance of snow showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 310201
glfls 
expires:202603310800;;565477

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt mon mar 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 29.8 inch trough over the southern great lakes will move eastward 
through tuesday as high pressure approaches the upper great lakes. 
on wednesday morning a 30.4 inch high pressure will be over lake 
superior, with the center of the high over james bay at 30.6 inches. 
by thursday morning, the high builds to 30.8 inches while a 29.5 
inch low develops over the central plains. this low passes just 
south of lake superior at 29.7 inches overnight into friday morning 
while another low of 29.6 inches develops over the oklahoma 
panhandle. this low approaches the bay of green bay saturday 
afternoon, tracking over eastern lake superior at near 29.4 inches 
by sunday morning.



lsz263-310800-
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 pm edt mon mar 30 2026

.rest of tonight...northeast winds 15 to 25 knots. a chance of
snow showers, possibly mixed with rain. waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet. 
.tuesday...east winds 15 to 25 knots backing northeast in the
afternoon, then diminishing to 10 to 20 knots late. a chance of
snow showers, possibly mixed with rain. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.tuesday night...northeast winds 5 to 15 knots. a slight chance
of snow showers through midnight. waves subsiding to 2 to 4 feet.
.wednesday...northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet. 
.wednesday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a slight chance of snow showers after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...east gales to 40 knots. a chance of snow showers
through early afternoon, then snow showers likely by mid
afternoon. waves building to 10 to 14 feet occasionally to
18 feet. 
.thursday night...northeast gales to 35 knots diminishing to
20 to 30 knots after midnight. snow showers. waves subsiding to
7 to 10 feet occasionally to 13 feet. 
.friday...northeast winds 15 to 25 knots veering east. a chance
of snow showers. waves subsiding to 4 to 7 feet occasionally to
9 feet, then building to 6 to 9 feet occasionally to 11 feet. 
.saturday...northeast winds 15 to 25 knots backing north. snow
showers likely. a chance of snow showers. waves subsiding to 5 to
8 feet occasionally to 10 feet. 

$$