fzus63 kmqt 232001
glfls 
expires:202603240800;;183035

open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon mar 23 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...

ridging builds to 30.4 inches over the western great lakes basin 
throughout today. a clipper low around 29.9 inches tracks across 
northern ontario and briefly extends a 30.1 inch trough over lake 
superior tuesday morning. 30.3 inch ridging quickly builds back over 
the lake by tuesday evening associated with high pressure of 30.4 
inches over northern ontario. another clipper low around 29.7 inches 
phases with a shortwave low lifting off of the northern rockies 
tuesday and tuesday night, bringing troughing of at least 29.8 
inches back across lake superior by wednesday. a secondary 29.6 inch 
low moves over the upper great lakes wednesday night into thursday. 
by friday, expansive ridging of 30.7 inches builds over the great 
plains, shifting over the mississippi river valley by saturday 
morning and south of the great lakes by that evening.



lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt mon mar 23 2026 /300 pm cdt mon mar 23 2026/

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then veering west late. a slight chance
of rain showers through midnight. a slight chance of snow
showers. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.tuesday...north winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. waves
subsiding to calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing northeast late. a slight
chance of freezing rain and snow showers after midnight. waves
building to 1 to 3 feet. 
.wednesday...northeast winds 10 to 20 knots. a slight chance of
freezing rain through early afternoon. a slight chance of snow
showers. waves building to 2 to 4 feet. 
.wednesday night...east winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. a chance of snow showers. a chance
of rain showers after midnight. waves subsiding to 1 to 3 feet. 
.thursday...north winds 10 to 20 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. 
.thursday night...north winds 10 to 20 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots.
waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 232001
glfls 
expires:202603240800;;183036

open lake forecast for lake superior
national weather service marquette mi
400 pm edt mon mar 23 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...

ridging builds to 30.4 inches over the western great lakes basin 
throughout today. a clipper low around 29.9 inches tracks across 
northern ontario and briefly extends a 30.1 inch trough over lake 
superior tuesday morning. 30.3 inch ridging quickly builds back over 
the lake by tuesday evening associated with high pressure of 30.4 
inches over northern ontario. another clipper low around 29.7 inches 
phases with a shortwave low lifting off of the northern rockies 
tuesday and tuesday night, bringing troughing of at least 29.8 
inches back across lake superior by wednesday. a secondary 29.6 inch 
low moves over the upper great lakes wednesday night into thursday. 
by friday, expansive ridging of 30.7 inches builds over the great 
plains, shifting over the mississippi river valley by saturday 
morning and south of the great lakes by that evening.



lsz263-240800-
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 mon mar 23 2026

.late this afternoon...southwest winds 10 to 20 knots. waves calm
to 2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 20 to
30 knots after midnight, then veering west late. a chance of snow
showers. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then veering east late. waves
subsiding to calm to 2 feet. 
.tuesday night...east winds 5 to 15 knots veering southeast late.
a slight chance of freezing rain and snow showers after midnight.
waves building to 2 to 4 feet. 
.wednesday...east winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. a slight chance of rain showers
through early afternoon. a slight chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.wednesday night...northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of snow showers. a chance
of rain showers after midnight. waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet. 
.thursday...north winds 10 to 20 knots. a chance of rain showers
through early afternoon. a chance of snow showers. waves building
to 3 to 5 feet occasionally to 7 feet. 
.thursday night...north winds 15 to 25 knots. freezing spray
after midnight. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots.
freezing spray. waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.saturday...west winds 15 to 25 knots. waves subsiding to 3 to
6 feet occasionally to 8 feet. 

$$