fzus63 kmqt 181401
glfls 
expires:202607182000;;178015

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat jul 18 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 29.7 inch low will move from eastern ontario to northern new 
england through tonight, deepening to 29.3 inches. weak ridging of 
around 30.0 inches returns to the great lakes this evening and 
persists through sunday. a strong low ranging from 29.1 to 29.4 
inches over northern ontario looks to bring troughing of around 29.5 
inches over lake superior on monday. then a 30.1 inch ridge descends 
southeast over the midwest tuesday through wednesday night. 




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt sat jul 18 2026 /901 am cdt sat jul 18 2026/

.rest of today...northwest winds 5 to 15 knots backing southwest
in the afternoon. patchy smoke. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots becoming north less than
10 knots after midnight, then backing southwest late. patchy
smoke. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots backing south late.
patchy smoke. waves calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a slight chance of showers through
midnight, then showers likely and a slight chance of
thunderstorms after midnight. waves calm to 2 feet. 
.monday...southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a chance of showers through early
afternoon. a chance of thunderstorms. showers likely by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.monday night...west winds 15 to 25 knots. a chance of showers
through midnight. waves subsiding to 1 to 3 feet. 
.tuesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202607182000;;178016

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat jul 18 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 29.7 inch low will move from eastern ontario to northern new 
england through tonight, deepening to 29.3 inches. weak ridging of 
around 30.0 inches returns to the great lakes this evening and 
persists through sunday. a strong low ranging from 29.1 to 29.4 
inches over northern ontario looks to bring troughing of around 29.5 
inches over lake superior on monday. then a 30.1 inch ridge descends 
southeast over the midwest tuesday through wednesday night. 




lsz263-182000-
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-
1001 am edt sat jul 18 2026

...dense smoke advisory in effect until 8 pm edt sunday...

.rest of today...north winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. smoke. a slight chance of
showers by mid afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots backing south after midnight.
areas of smoke. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots backing south late. areas
of smoke. waves calm to 2 feet. 
.sunday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. patchy smoke through midnight. a
chance of showers and a slight chance of thunderstorms. waves
building to 2 to 4 feet. 
.monday...southwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. showers likely and a slight chance of
thunderstorms. waves building to 3 to 6 feet occasionally to
8 feet. 
.monday night...west winds 15 to 25 knots. a chance of showers.
waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves calm to 2 feet. 

$$