fzus63 kmqt 231401
glfls 
expires:202603232000;;168726

open lake forecast for lake superior
national weather service marquette mi
1000 am 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.



lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt mon mar 23 2026 /900 am cdt mon mar 23 2026/

.rest of today...west winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.tonight...south winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then becoming west 10 to 20 knots late.
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 backing northeast
after midnight. a slight chance of snow showers after midnight.
waves building to 1 to 3 feet. 
.wednesday...northeast winds 10 to 20 knots. a slight chance of
rain showers through early afternoon. a slight chance of snow
showers. waves building to 2 to 4 feet. 
.wednesday night...east winds 10 to 20 knots. a chance of snow
showers. a chance of rain showers and freezing rain after
midnight. waves subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 to 20 knots backing north. a
chance of snow showers, possibly mixed with rain and freezing
rain. waves building to 2 to 4 feet, then subsiding to 1 to
3 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. 

$$

fzus63 kmqt 231401
glfls 
expires:202603232000;;168727

open lake forecast for lake superior
national weather service marquette mi
1000 am 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.



lsz263-232000-
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 mon mar 23 2026

.rest of today...northwest winds 5 to 15 knots backing west in
the afternoon, then becoming southwest 10 to 20 knots late. waves
1 to 3 feet subsiding to calm to 2 feet. 
.tonight...south winds 15 to 25 knots becoming southwest 20 to
30 knots after midnight, then becoming west 15 to 25 knots late.
a slight chance of snow showers. waves building 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 10 to 20 knots. a slight chance of
snow showers after midnight. waves building to 2 to 4 feet. 
.wednesday...northeast winds 10 to 20 knots. 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...east winds 15 to 25 knots. a chance of snow
showers. a chance of rain showers and freezing rain after
midnight. waves subsiding to 1 to 3 feet, then building to 2 to
4 feet. 
.thursday...northeast winds 20 to 30 knots becoming north 15 to
25 knots. a chance of snow showers, possibly mixed with rain.
freezing spray. 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.
waves subsiding to 2 to 4 feet, then building to 5 to 8 feet
occasionally to 10 feet. 

$$