fzus63 kmqt 230801
glfls 
expires:202608232000;;213764

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun aug 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...

30.1 inch ridging moves into lake superior early this week via a 
weakening 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch clipper over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving early wednesday morning. the low shifts east wednesday 
night with weak ridging of 29.9 inches building over the lake on 
thursday.




lsz162-232000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun aug 23 2026 /300 am cdt sun aug 23 2026/

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...north winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest after
midnight, then veering north late. waves calm to 2 feet. 
.monday...north winds 5 to 15 knots veering south in the
afternoon. waves calm to 2 feet. 
.monday night...southeast winds 5 to 15 knots becoming south less
than 10 knots after midnight. a slight chance of showers after
midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots backing east by mid
afternoon. a chance of showers through early afternoon, then
showers likely by mid afternoon. waves calm to 2 feet. 
.tuesday night...east winds 5 to 15 knots veering west after
midnight. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves calm to
2 feet. 
.wednesday...west winds 5 to 15 knots becoming northwest 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.thursday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 230801
glfls 
expires:202608232000;;213765

open lake forecast for lake superior
national weather service marquette mi
400 am edt sun aug 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...

30.1 inch ridging moves into lake superior early this week via a 
weakening 30.2 inch parent high from the canadian prairies that 
drops down into the ohio river valley by late monday, weakening to 
30.1 inches as it does so. a 29.7 inch clipper over the canadian 
prairies monday night then drops southeast towards lake superior, 
arriving early wednesday morning. the low shifts east wednesday 
night with weak ridging of 29.9 inches building over the lake on 
thursday.




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-
400 am edt sun aug 23 2026

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

$$