fzus63 kmqt 050801
glfls 
expires:202609052000;;936314

open lake forecast for lake superior
national weather service marquette mi
400 am edt sat sep 5 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...

high pressure ridging builds to 30.1 inches over lake superior by 
this afternoon, remaining through sunday night. the ridge briefly 
builds further to 30.2 inches on monday as a 30.4 inch high passes 
eastward over far northern ontario. meanwhile, a 29.6 inch low 
develops off the northern rockies. the low then tracks northeast to 
james bay, deepening to 29.3 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday.




lsz162-052000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sat sep 5 2026 /300 am cdt sat sep 5 2026/

.early this morning...northeast winds 10 to 20 knots. patchy fog.
a slight chance of showers. waves 1 to 3 feet subsiding to calm
to 2 feet. 
.today...northeast winds 10 to 20 knots. patchy fog through early
afternoon. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. waves calm to 2 feet. 
.sunday night...northeast winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. a chance of showers. waves calm to 2 feet. 
.monday night...east winds 20 to 30 knots veering south after
midnight. showers and a chance of thunderstorms. waves building
to 3 to 5 feet occasionally to 7 feet. 
.tuesday...south winds 20 to 30 knots becoming west gales to
35 knots. showers likely. a chance of thunderstorms. a chance of
showers. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 
.wednesday...west gales to 40 knots becoming northwest gales to
35 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 050801
glfls 
expires:202609052000;;936315

open lake forecast for lake superior
national weather service marquette mi
400 am edt sat sep 5 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...

high pressure ridging builds to 30.1 inches over lake superior by 
this afternoon, remaining through sunday night. the ridge briefly 
builds further to 30.2 inches on monday as a 30.4 inch high passes 
eastward over far northern ontario. meanwhile, a 29.6 inch low 
develops off the northern rockies. the low then tracks northeast to 
james bay, deepening to 29.3 inches by wednesday afternoon. this 
sends a 29.7 inch trough over lake superior tuesday night and 
wednesday.




lsz263-052000-
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 sat sep 5 2026

.early this morning...northeast winds 5 to 15 knots. patchy fog.
waves 1 to 3 feet subsiding to calm to 2 feet. 
.today...northeast winds 5 to 15 knots increasing to 10 to
20 knots late. patchy dense fog through early afternoon. waves
calm to 2 feet. 
.tonight...east winds 5 to 15 knots becoming southeast less than
10 knots late. waves calm to 2 feet. 
.sunday...southeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots becoming south 10 to
20 knots after midnight. waves calm to 2 feet. 
.monday...southeast winds 10 to 20 knots backing east by mid
afternoon. waves calm to 2 feet. 
.monday night...southeast winds 20 to 30 knots becoming south
gales to 35 knots after midnight. a chance of showers through
midnight, then showers after midnight. waves building to 3 to
6 feet occasionally to 8 feet. 
.tuesday...south gales to 35 knots becoming southwest gales to
40 knots. a chance of showers and thunderstorms. waves subsiding
to 3 to 5 feet occasionally to 7 feet, then building to 5 to
8 feet occasionally to 10 feet. 
.wednesday...west gales to 45 knots becoming northwest gales to
40 knots. waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 2 to 4 feet. 

$$