fzus63 kmqt 122001
glfls 
expires:202603130800;;561484

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu mar 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 29.1 inch low will move through northern wi late tonight reaching 
northern lake michigan by late morning, and lake huron by late 
afternoon. it then moves over new england at 29.5 inches by saturday 
morning. a 30.2 inch ridge will extend over lake superior from 
central canada on saturday afternoon. a 29.3 inch low developing 
over the central plains saturday night will track to near lake huron 
at 28.9 inches by monday morning. high pressure of 30.4 inches will 
overspread the northern plains on monday and move to lake superior 
by tuesday as the low departs into northern quebec. a 29.9 inch 
trough will move over lake superior on wednesday.



lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt thu mar 12 2026 /300 pm cdt thu mar 12 2026/

...gale warning in effect from 10 pm edt /9 pm cdt/ this evening
through friday morning...

.late this afternoon...east winds 15 to 25 knots. a slight chance
of snow showers. waves calm to 2 feet building to 2 to 4 feet. 
.tonight...east gales to 45 knots. snow. a slight chance of rain
after midnight. waves building to 12 to 17 feet occasionally to
21 feet. 
.friday...northeast gales to 40 knots becoming north 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. freezing spray through early afternoon. a chance of snow
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. freezing spray. a chance of snow
showers. waves building to 10 to 14 feet occasionally to 18 feet.
.sunday night...north gales to 45 knots. heavy freezing spray. a
chance of snow showers. waves building to 11 to 15 feet
occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet. 
.monday...north gales to 45 knots becoming northwest gales to
35 knots. heavy freezing spray. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 122001
glfls 
expires:202603130800;;561485

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu mar 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 29.1 inch low will move through northern wi late tonight reaching 
northern lake michigan by late morning, and lake huron by late 
afternoon. it then moves over new england at 29.5 inches by saturday 
morning. a 30.2 inch ridge will extend over lake superior from 
central canada on saturday afternoon. a 29.3 inch low developing 
over the central plains saturday night will track to near lake huron 
at 28.9 inches by monday morning. high pressure of 30.4 inches will 
overspread the northern plains on monday and move to lake superior 
by tuesday as the low departs into northern quebec. a 29.9 inch 
trough will move over lake superior on wednesday.



lsz263-130800-
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 pm edt thu mar 12 2026

...gale warning in effect from 11 pm edt this evening through
friday afternoon...

.late this afternoon...southeast winds 10 to 20 knots. a slight
chance of snow showers. waves calm to 2 feet. 
.tonight...southeast gales to 35 knots becoming east gales to
45 knots after midnight. a chance of snow through midnight, then
snow after midnight. freezing spray after midnight. waves
building to 11 to 15 feet occasionally to 19 feet. 
.friday...northeast gales to 40 knots becoming north gales to
35 knots in the afternoon, then diminishing to 10 to 20 knots
late. freezing spray. a chance of snow showers. waves subsiding
to 4 to 7 feet occasionally to 9 feet. 
.friday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a slight chance of snow showers through
midnight. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...southeast winds 5 to 15 knots becoming east
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
40 knots by mid afternoon. freezing spray. a chance of snow
showers. waves building to 10 to 14 feet occasionally to 18 feet.
.sunday night...north gales to 45 knots increasing to storm force
winds to 50 knots after midnight. heavy freezing spray. a chance
of snow showers. 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. heavy freezing spray. a chance of snow
showers. waves subsiding to 4 to 7 feet occasionally to 9 feet. 
.tuesday...northwest winds 20 to 30 knots becoming southwest
10 to 20 knots. waves subsiding to calm to 2 feet, then building
to 1 to 3 feet. 

$$