fzus63 kmqt 192001
glfls 
expires:202603200800;;969562

open lake forecast for lake superior
national weather service marquette mi
400 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 this afternoon 
gives way 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-
400 pm edt thu mar 19 2026 /300 pm cdt thu mar 19 2026/

.late this afternoon...east winds 10 to 20 knots. a slight chance
of rain and snow showers. waves calm to 2 feet. 
.tonight...east winds 10 to 20 knots veering southwest after
midnight, then veering west late. a chance of freezing rain, snow
and rain showers through 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 192001
glfls 
expires:202603200800;;969563

open lake forecast for lake superior
national weather service marquette mi
400 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 this afternoon 
gives way 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-
400 pm edt thu mar 19 2026

.late this afternoon...east winds 5 to 15 knots. a slight chance
of rain and snow showers. waves calm to 2 feet. 
.tonight...southeast winds 10 to 20 knots veering southwest after
midnight, then becoming west 5 to 15 knots late. snow showers,
possibly mixed with freezing rain through midnight. a chance of
rain showers. waves building to 2 to 4 feet, then 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. 

$$