fzus63 kmqt 182001
glfls 
expires:202603190800;;916011

open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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 clipper low over northern ontario lifts towards james 
bay this evening. behind this low, weak ridging of around 30.1 
inches returns over lake superior on thursday ahead of another 
clipper low moving through the lake thursday night into early friday 
at around 29.7 inches. while a subsequent low moves through northern 
ontario towards james bay late friday/friday night, yet another low 
stretches into the northern plains around the same time. together, 
these lows are expected to bring about troughing of around around 
29.7 inch over lake superior on saturday. behind the troughing, 30.4 
inch ridging builds into the great lakes and northern plains to 
begin next week.



lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt wed mar 18 2026 /300 pm cdt wed mar 18 2026/

.late this afternoon...southwest winds 10 to 20 knots. waves 1 to
3 feet. 
.tonight...west winds 5 to 15 knots veering north late. a slight
chance of rain and snow showers through midnight. waves subsiding
to calm to 2 feet. 
.thursday...north winds 5 to 15 knots veering south in the
afternoon. a slight chance of rain and snow showers by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots becoming
southwest 10 to 20 knots after midnight, then veering west late.
a chance of snow showers through midnight. a slight chance of
rain showers. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots. a chance of rain
showers through early afternoon. a chance of snow showers. waves
building to 1 to 3 feet. 
.saturday night...northeast winds 15 to 25 knots. a chance of
snow showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.sunday...northeast winds 15 to 25 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming southwest 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202603190800;;916012

open lake forecast for lake superior
national weather service marquette mi
400 pm edt wed mar 18 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 clipper low over northern ontario lifts towards james 
bay this evening. behind this low, weak ridging of around 30.1 
inches returns over lake superior on thursday ahead of another 
clipper low moving through the lake thursday night into early friday 
at around 29.7 inches. while a subsequent low moves through northern 
ontario towards james bay late friday/friday night, yet another low 
stretches into the northern plains around the same time. together, 
these lows are expected to bring about troughing of around around 
29.7 inch over lake superior on saturday. behind the troughing, 30.4 
inch ridging builds into the great lakes and northern plains to 
begin next week.



lsz263-190800-
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 wed mar 18 2026

.late this afternoon...west winds 10 to 20 knots. waves 2 to
4 feet. 
.tonight...west winds 5 to 15 knots veering north late. a slight
chance of snow showers through midnight. a slight chance of rain
showers. waves subsiding to calm to 2 feet. 
.thursday...north winds 5 to 15 knots becoming south less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
a chance of rain and snow showers by mid afternoon. waves calm to
2 feet. 
.thursday night...southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then becoming west 5 to 15 knots
late. a chance of rain and snow showers. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...north winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. a chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...northeast winds 20 to 30 knots. a chance of
snow showers. waves building to 7 to 10 feet occasionally to
13 feet. 
.sunday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet, then building to 2 to
4 feet. 
.monday...southwest winds 10 to 20 knots increasing to gales to
35 knots. waves subsiding to 1 to 3 feet, then building to 6 to
9 feet occasionally to 11 feet. 

$$