fzus63 kmqt 181401
glfls 
expires:202603182000;;901634

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 weakening 29.8 inch clipper low continues moving across northern 
ontario today. 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 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 saturday. behind the troughing, 30.4 inch ridging 
builds into the great lakes and northern plains to begin next week.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt wed mar 18 2026 /900 am cdt wed mar 18 2026/

.rest of today...southwest winds 15 to 25 knots diminishing to
10 to 20 knots late. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest late.
a slight chance of rain showers. a slight chance of snow showers
after midnight. waves subsiding to calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering southeast in
the afternoon, then veering south late. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots veering southwest
after midnight. a chance of snow showers through midnight. a
chance of rain showers. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. a slight chance of rain showers. waves calm to
2 feet. 
.friday night...west winds 10 to 20 knots. waves calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots increasing to 15 to
25 knots. a chance of rain showers. a chance of snow showers.
waves building to 3 to 5 feet occasionally to 7 feet. 
.sunday...northeast winds 15 to 25 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202603182000;;901635

open lake forecast for lake superior
national weather service marquette mi
1000 am 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 weakening 29.8 inch clipper low continues moving across northern 
ontario today. 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 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 saturday. behind the troughing, 30.4 inch ridging 
builds into the great lakes and northern plains to begin next week.



lsz263-182000-
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 wed mar 18 2026

.rest of today...southwest winds 10 to 20 knots. a slight chance
of snow showers by late morning. waves 3 to 5 feet occasionally
to 7 feet subsiding to 2 to 4 feet. 
.tonight...west winds 5 to 15 knots veering north late. waves
subsiding to calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots becoming east less than
10 knots in the afternoon, then becoming south 5 to 15 knots
late. waves calm to 2 feet. 
.thursday night...south winds 5 to 15 knots veering southwest
after midnight. a chance of rain showers, possibly mixed with
snow. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots veering northwest by mid
afternoon. a slight chance of rain showers. waves calm to 2 feet.
.friday night...west winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves building to 1 to 3 feet. 
.saturday...northeast winds 15 to 25 knots increasing to 20 to
30 knots. a chance of rain showers. a chance of snow showers.
waves subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northeast winds 20 to 30 knots becoming north 10 to
20 knots. waves subsiding to 2 to 4 feet. 

$$