fzus63 kmqt 042001
glfls 
expires:202610050800;;534554

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun oct 4 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 29.6 inch low over james bay this evening will deepen to 29.5 
inches over northern quebec by monday morning. as this low departs 
to the east, 30.3 inch high pressure over the northern plains this 
evening will shift east to the great lakes at 30.2 to 30.3 inches on 
monday. a 29.5 inch low then drops southeast out of northern canada, 
reaching northern ontario at 29.5 inches by tuesday evening. this 
brings 29.6 inch troughing over lake superior on tuesday, weakening 
to 29.7 inches through wednesday. high pressure builds back in from 
the canadian prairie and northern plains late in the week, resulting 
in 30.1 inch ridging over lake superior late thursday into friday.




lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt sun oct 4 2026 /301 pm cdt sun oct 4 2026/

.late this afternoon...west winds 15 to 25 knots. a slight chance
of showers. waves 1 to 3 feet. 
.tonight...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves subsiding to calm to 2 feet. 
.monday...north winds 5 to 15 knots veering south in the
afternoon, then backing southeast late. waves calm to 2 feet. 
.monday night...southeast winds 10 to 20 knots veering south
late. a slight chance of showers. waves building to 2 to 4 feet. 
.tuesday...southwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 15 to 25 knots. waves building to 1 to
3 feet. 
.wednesday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.thursday...west winds 10 to 20 knots. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots backing east. waves building
to 1 to 3 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202610050800;;534555

open lake forecast for lake superior
national weather service marquette mi
401 pm edt sun oct 4 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 29.6 inch low over james bay this evening will deepen to 29.5 
inches over northern quebec by monday morning. as this low departs 
to the east, 30.3 inch high pressure over the northern plains this 
evening will shift east to the great lakes at 30.2 to 30.3 inches on 
monday. a 29.5 inch low then drops southeast out of northern canada, 
reaching northern ontario at 29.5 inches by tuesday evening. this 
brings 29.6 inch troughing over lake superior on tuesday, weakening 
to 29.7 inches through wednesday. high pressure builds back in from 
the canadian prairie and northern plains late in the week, resulting 
in 30.1 inch ridging over lake superior late thursday into friday.




lsz263-050800-
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-
401 pm edt sun oct 4 2026

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

$$