fzus63 kmqt 300256
glfls 
expires:202511300900;;740106

open lake forecast for lake superior
national weather service marquette mi
956 pm est sat nov 29 2025

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...

29.8 inch low pressure currently over illinois tracks over southern 
michigan into sunday morning. the low will reach georgian bay at 
29.7 inches sunday afternoon while 30.6 inch high pressure expands 
over the northern plains. as the low quickly moves to the mouth of 
the st lawrence river monday morning, the high will weaken slightly 
to 30.5 inches just southwest of the great lakes. this high weakens 
to 30.3 inches over the lower great lakes monday evening while a 
weak 30.0 inch trough descends over the lake from northern ontario. 
after the trough briefly deepens to 29.9 inches, a weak 30.0 inch 
ridge moves over the lake tuesday morning as a 29.7 inch clipper low 
forms over saskatchewan. the low weakens slightly to 29.8 inches 
tuesday evening as it approaches lake superior. by wednesday 
afternoon, the low will deepen to 29.6 inches south of james bay 
while a 30.5 inch high builds over the high plains. as the low 
departs to the east, the high shifts over the central plains 
thursday morning, moving south of the great lakes thursday evening.



lsz162-300900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
956 pm est sat nov 29 2025 /856 pm cst sat nov 29 2025/

.rest of tonight...northeast winds 10 to 20 knots increasing to
20 to 30 knots by midnight, then backing north late. a chance of
snow showers. waves 3 to 5 feet occasionally to 7 feet building
to 6 to 9 feet occasionally to 11 feet. 
.sunday...north winds 15 to 25 knots backing northwest. waves
subsiding to 2 to 4 feet. 
.sunday night...northwest winds 10 to 20 knots backing west by
midnight. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.monday...west winds 20 to 30 knots backing southwest in the
afternoon. a slight chance of snow showers in the afternoon.
waves building to 3 to 6 feet occasionally to 8 feet. 
.monday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a slight chance of snow showers in the
evening. waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.tuesday night...west winds 15 to 25 knots veering northwest
after midnight. a chance of snow showers. waves building to 1 to
3 feet. 
.wednesday...northwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.thursday...southwest winds 20 to 30 knots becoming west 15 to
25 knots. a chance of snow showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 300256
glfls 
expires:202511300900;;740107

open lake forecast for lake superior
national weather service marquette mi
956 pm est sat nov 29 2025

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...

29.8 inch low pressure currently over illinois tracks over southern 
michigan into sunday morning. the low will reach georgian bay at 
29.7 inches sunday afternoon while 30.6 inch high pressure expands 
over the northern plains. as the low quickly moves to the mouth of 
the st lawrence river monday morning, the high will weaken slightly 
to 30.5 inches just southwest of the great lakes. this high weakens 
to 30.3 inches over the lower great lakes monday evening while a 
weak 30.0 inch trough descends over the lake from northern ontario. 
after the trough briefly deepens to 29.9 inches, a weak 30.0 inch 
ridge moves over the lake tuesday morning as a 29.7 inch clipper low 
forms over saskatchewan. the low weakens slightly to 29.8 inches 
tuesday evening as it approaches lake superior. by wednesday 
afternoon, the low will deepen to 29.6 inches south of james bay 
while a 30.5 inch high builds over the high plains. as the low 
departs to the east, the high shifts over the central plains 
thursday morning, moving south of the great lakes thursday evening.



lsz263-300900-
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-
956 pm est sat nov 29 2025

.rest of tonight...northeast winds 15 to 25 knots increasing to
20 to 30 knots by midnight, then backing north late. snow showers
likely late in the evening, then a chance of snow showers after
midnight. waves 2 to 4 feet building to 6 to 9 feet occasionally
to 11 feet. 
.sunday...north winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. a slight chance of snow showers in the
morning. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday night...northwest winds 10 to 20 knots backing west by
midnight, then increasing to 15 to 25 knots late. waves subsiding
to 1 to 3 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.monday...west winds 20 to 30 knots becoming southwest gales to
35 knots in the afternoon. a slight chance of snow showers. waves
building to 5 to 8 feet occasionally to 10 feet. 
.monday night...west winds 15 to 25 knots. a chance of snow
showers. waves subsiding to 2 to 4 feet. 
.tuesday...west winds 10 to 20 knots backing southwest in the
afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...west winds 10 to 20 knots increasing to 20 to
30 knots after midnight. a chance of snow showers in the evening,
then snow showers likely after midnight. waves building to 3 to
5 feet occasionally to 7 feet. 
.wednesday...northwest winds 20 to 30 knots. a chance of snow
showers. freezing spray. waves building to 3 to 6 feet
occasionally to 8 feet. 
.thursday...west winds 20 to 30 knots. freezing spray. a chance
of snow showers. waves building to 3 to 6 feet occasionally to
8 feet. 

$$