fzus63 kmqt 250801
glfls 
expires:202606252000;;870794

open lake forecast for lake superior
national weather service marquette mi
400 am edt thu jun 25 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 29.9 inch low currently tracking through lower michigan today 
continues towards the st. lawrence seaway tonight into friday. as it 
leaves the upper midwest, expect weak 30.0 inch ridging to return to 
lake superior today, building to 30.1 inches by friday morning and 
remaining that way into at least sunday morning. meanwhile late this 
weekend, a 29.2 inch low lifts from the rockies towards the northern 
plains and canadian prairies, eventually becoming a 29.0 inch low 
spinning over the canadian prairies by tuesday morning. expect this 
to cause progressively deepening troughing over lake superior early 
next week, with the troughing over the lake becoming 29.8 inches by 
tuesday morning. 




lsz162-252000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt thu jun 25 2026 /300 am cdt thu jun 25 2026/

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northeast winds 5 to 15 knots backing north in the
afternoon, then diminishing to less than 10 knots late. waves
calm to 2 feet. 
.tonight...north winds less than 10 knots. waves calm to 2 feet. 
.friday...north winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.friday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.saturday...northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet. 
.saturday night...northeast winds 10 to 20 knots veering east
after midnight. waves 1 to 3 feet. 
.sunday...east winds 15 to 25 knots. a chance of showers, then
showers likely. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.monday...northeast winds 10 to 20 knots. a chance of
thunderstorms. showers likely. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 250801
glfls 
expires:202606252000;;870795

open lake forecast for lake superior
national weather service marquette mi
400 am edt thu jun 25 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 29.9 inch low currently tracking through lower michigan today 
continues towards the st. lawrence seaway tonight into friday. as it 
leaves the upper midwest, expect weak 30.0 inch ridging to return to 
lake superior today, building to 30.1 inches by friday morning and 
remaining that way into at least sunday morning. meanwhile late this 
weekend, a 29.2 inch low lifts from the rockies towards the northern 
plains and canadian prairies, eventually becoming a 29.0 inch low 
spinning over the canadian prairies by tuesday morning. expect this 
to cause progressively deepening troughing over lake superior early 
next week, with the troughing over the lake becoming 29.8 inches by 
tuesday morning. 




lsz263-252000-
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 thu jun 25 2026

.early this morning...northeast winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots becoming north less than
10 knots in the afternoon, then backing west late. patchy dense
fog through early afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots becoming southwest less than
10 knots after midnight. waves calm to 2 feet. 
.friday...southwest winds less than 10 knots becoming northeast
5 to 15 knots in the afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.sunday...east winds 15 to 25 knots veering southeast. a chance
of showers. waves building to 3 to 6 feet occasionally to 8 feet.
.monday...southeast winds 10 to 20 knots veering south. a chance
of showers and thunderstorms. waves subsiding to 1 to 3 feet. 

$$