fzus63 kmqt 190801
glfls 
expires:202603192000;;942585

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

a 29.8 inch clipper low over northern ontario lifts towards james 
bay by morning. behind this low, weak ridging of around 30.1 inches 
builds over lake superior on today ahead of another clipper low 
moving through the lake thursday night into early friday at around 
29.8 inches. while another low moves through northern ontario 
towards the north short 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.



lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt thu mar 19 2026 /300 am cdt thu mar 19 2026/

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. a slight
chance of rain and snow showers by mid afternoon. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then veering west late. a chance of snow
and rain showers through midnight. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots becoming southwest 10 to
20 knots late. 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 increasing to 15 to
25 knots by mid afternoon. a chance of snow showers, possibly
mixed with rain. waves building to 2 to 4 feet. 
.saturday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of snow showers. waves
building to 4 to 7 feet occasionally to 9 feet. 
.sunday...northeast winds 15 to 25 knots becoming northwest 5 to
15 knots. a chance of snow showers. waves building to 5 to 8 feet
occasionally to 10 feet, then 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. 

$$

fzus63 kmqt 190801
glfls 
expires:202603192000;;942586

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

a 29.8 inch clipper low over northern ontario lifts towards james 
bay by morning. behind this low, weak ridging of around 30.1 inches 
builds over lake superior on today ahead of another clipper low 
moving through the lake thursday night into early friday at around 
29.8 inches. while another low moves through northern ontario 
towards the north short 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.



lsz263-192000-
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 am edt thu mar 19 2026

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...northeast winds 5 to 15 knots veering east in the
afternoon. a slight chance of snow showers by mid afternoon.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest after
midnight, then veering west late. a chance of snow showers
through midnight. a chance of rain showers. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.friday...northwest winds 5 to 15 knots backing southwest late.
waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...northeast winds 5 to 15 knots increasing to 15 to
25 knots by mid afternoon. a chance of rain showers through early
afternoon. a chance of snow showers. waves building to 2 to
4 feet. 
.saturday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of snow showers. waves
building to 5 to 8 feet occasionally to 10 feet. 
.sunday...northeast winds 20 to 30 knots becoming northwest 10 to
20 knots. freezing spray. waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 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. 

$$