fzus63 kmqt 300801
glfls 
expires:202603302000;;526186

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

as weak ridging of 30.0 inches returns to the lake today, another 
low pressure deepens to 29.4 inches in the lee of the rockies before 
pushing into the plains this evening. this low weakens to 29.6 
inches as it moves through the great lakes on tuesday. the low then 
tracks along the st. lawrence seaway tuesday night and a 30.3 inch 
high pressure builds over the northern plains. this high gradually 
builds over northern ontario near james bay to 30.5 inches by 
wednesday. by thursday, the high builds to 30.8 inches over northern 
quebec while a 29.8 inch low passes over lower michigan and a 29.3 
inch low pressure organizes in the lee of the rockies thursday 
night. the low over the rockies weakens to 29.6 inches by friday 
before lifting towards the great lakes basin at around 29.7 inches 
on saturday.



lsz162-302000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt mon mar 30 2026 /300 am cdt mon mar 30 2026/

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northeast winds 5 to 15 knots increasing to 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.tonight...east winds 20 to 30 knots diminishing to 15 to
25 knots late. a chance of rain and snow showers, possibly mixed
with freezing rain after midnight. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...northeast winds 15 to 25 knots backing northwest late.
a slight chance of freezing rain through early afternoon. a
chance of snow showers, possibly mixed with rain. waves subsiding
to 3 to 5 feet occasionally to 7 feet. 
.tuesday night...northwest winds 10 to 20 knots veering north
after midnight. a slight chance of snow showers through midnight.
waves subsiding to 1 to 3 feet. 
.wednesday...northeast winds 10 to 20 knots veering east by mid
afternoon. waves building to 2 to 4 feet. 
.wednesday night...east winds 15 to 25 knots increasing to 20 to
30 knots after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday...east gales to 45 knots becoming northeast gales to
40 knots. a chance of snow showers, then snow showers likely.
waves building to 12 to 17 feet occasionally to 21 feet, then
subsiding to 10 to 14 feet occasionally to 18 feet. 
.friday...northeast winds 20 to 30 knots becoming east gales to
35 knots. a chance of snow showers. rain showers likely. waves
subsiding to 6 to 9 feet occasionally to 11 feet, then building
to 10 to 14 feet occasionally to 18 feet. 

$$

fzus63 kmqt 300801
glfls 
expires:202603302000;;526187

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

as weak ridging of 30.0 inches returns to the lake today, another 
low pressure deepens to 29.4 inches in the lee of the rockies before 
pushing into the plains this evening. this low weakens to 29.6 
inches as it moves through the great lakes on tuesday. the low then 
tracks along the st. lawrence seaway tuesday night and a 30.3 inch 
high pressure builds over the northern plains. this high gradually 
builds over northern ontario near james bay to 30.5 inches by 
wednesday. by thursday, the high builds to 30.8 inches over northern 
quebec while a 29.8 inch low passes over lower michigan and a 29.3 
inch low pressure organizes in the lee of the rockies thursday 
night. the low over the rockies weakens to 29.6 inches by friday 
before lifting towards the great lakes basin at around 29.7 inches 
on saturday.



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-
400 am edt mon mar 30 2026

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...northeast winds 5 to 15 knots increasing to 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots. a chance of snow and rain
showers after midnight. waves 3 to 6 feet occasionally to 8 feet.
.tuesday...east winds 15 to 25 knots backing northeast in the
afternoon, then becoming north 10 to 20 knots late. a slight
chance of freezing rain through early afternoon. a chance of snow
showers, possibly mixed with rain. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tuesday night...north winds 10 to 20 knots. a slight chance of
snow showers through midnight. waves subsiding to 2 to 4 feet. 
.wednesday...northeast winds 10 to 20 knots veering east 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. waves building to 3 to 6 feet
occasionally to 8 feet. 
.thursday...east gales to 40 knots backing northeast. a chance of
snow showers, then snow showers likely. waves building to 11 to
15 feet occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet. 
.friday...northeast winds 20 to 30 knots becoming east gales to
35 knots. a chance of snow showers. a chance of rain showers.
waves subsiding to 5 to 8 feet occasionally to 10 feet, then
building to 9 to 12 feet occasionally to 15 feet. 

$$