fzus63 kmqt 200201
glfls 
expires:202603200800;;980936

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu mar 19 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...

weak ridging around 30.1 inches over lake superior gives way to a 
clipper low moving across the lake tonight into early friday at 
around 29.7 inches. while another low moves through northern ontario 
toward the north shores of lake superior friday night, another low 
stretches into the northern plains around the same time. together, 
these lows are expected to bring about troughing of around around 
29.8 inch over lake superior on saturday into sunday. behind the 
troughing, 30.4 inch ridging builds into the great lakes and 
northern plains by monday. a 29.9 inch clipper low tracking across 
northern ontario on tuesday briefly extends a 30.0 inch trough over 
the lake. a 30.5 inch high quickly follows behind it for wednesday.



lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt thu mar 19 2026 /900 pm cdt thu mar 19 2026/

.rest of tonight...south winds 10 to 20 knots veering west late.
a chance of freezing rain and rain showers by midnight. waves
calm to 2 feet. 
.friday...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northeast late.
waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. a chance of rain and snow showers.
waves building to 1 to 3 feet. 
.saturday night...northeast winds 15 to 25 knots. a chance of
snow showers, possibly mixed with rain. waves building to 4 to
7 feet occasionally to 9 feet. 
.sunday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday night...northeast winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...southwest winds 5 to 15 knots increasing to 20 to
30 knots. waves building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 

$$

fzus63 kmqt 200201
glfls 
expires:202603200800;;980937

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu mar 19 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...

weak ridging around 30.1 inches over lake superior gives way to a 
clipper low moving across the lake tonight into early friday at 
around 29.7 inches. while another low moves through northern ontario 
toward the north shores of lake superior friday night, another low 
stretches into the northern plains around the same time. together, 
these lows are expected to bring about troughing of around around 
29.8 inch over lake superior on saturday into sunday. behind the 
troughing, 30.4 inch ridging builds into the great lakes and 
northern plains by monday. a 29.9 inch clipper low tracking across 
northern ontario on tuesday briefly extends a 30.0 inch trough over 
the lake. a 30.5 inch high quickly follows behind it for wednesday.



lsz263-200800-
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 thu mar 19 2026

.rest of tonight...south winds 10 to 20 knots veering southwest
after midnight, then becoming west 5 to 15 knots late. freezing
rain and snow showers likely by midnight. a chance of rain
showers. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northwest winds 5 to 15 knots backing west in the
afternoon. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northeast late.
waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. a chance of snow showers, possibly mixed with
rain. waves building to 1 to 3 feet. 
.saturday night...northeast winds 15 to 25 knots. a chance of
rain showers through midnight. a chance of snow showers. waves
building to 5 to 8 feet occasionally to 10 feet. 
.sunday...northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. freezing spray through early
afternoon. a chance of snow showers. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.sunday night...northeast winds 5 to 15 knots backing north after
midnight. waves subsiding to 2 to 4 feet. 
.monday...northwest winds 10 to 20 knots becoming southwest 20 to
30 knots. waves subsiding to calm to 2 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots becoming northeast 15 to
25 knots. waves subsiding to 1 to 3 feet, then building to 4 to
7 feet occasionally to 9 feet. 

$$