fzus63 kmqt 180801
glfls 
expires:202610182000;;297887

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun oct 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...

30.5 inch high pressure will stretch from new england to texas while 
a 29.1 inch low moves into hudson bay today, putting lake superior 
around 30.0 inches between these features. high pressure gradually 
strengthens to 30.6 inches over the canadian maritimes through 
monday as 30.4 inch ridge extends southwest to the tennessee valley. 
meanwhile, 30.2 inch high pressure builds over the northern plains 
sunday night and tracks east across ontario at 30.4 inches on 
monday, strengthening to 30.5 inches over quebec by tuesday. as this 
occurs, ridging over lake superior will strengthen from 30.1 inches 
tonight to 30.4 inches monday night into tuesday. ridging then 
weakens to 30.1 inches over the lake on wednesday as a 29.7 inch 
trough crosses hudson bay.




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun oct 18 2026 /301 am cdt sun oct 18 2026/

...gale warning in effect until 2 pm edt /1 pm cdt/ this
afternoon...

.early this morning...southwest gales to 35 knots. waves 7 to
11 feet occasionally to 13 feet. 
.today...southwest gales to 35 knots. waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet. 
.tonight...southwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight, then veering northwest late. waves
subsiding to calm to 2 feet. 
.monday...north winds 5 to 15 knots veering northeast in the
afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday night...east winds 5 to 15 knots veering southwest after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing northeast.
waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202610182000;;297888

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun oct 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...

30.5 inch high pressure will stretch from new england to texas while 
a 29.1 inch low moves into hudson bay today, putting lake superior 
around 30.0 inches between these features. high pressure gradually 
strengthens to 30.6 inches over the canadian maritimes through 
monday as 30.4 inch ridge extends southwest to the tennessee valley. 
meanwhile, 30.2 inch high pressure builds over the northern plains 
sunday night and tracks east across ontario at 30.4 inches on 
monday, strengthening to 30.5 inches over quebec by tuesday. as this 
occurs, ridging over lake superior will strengthen from 30.1 inches 
tonight to 30.4 inches monday night into tuesday. ridging then 
weakens to 30.1 inches over the lake on wednesday as a 29.7 inch 
trough crosses hudson bay.




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-
401 am edt sun oct 18 2026

...gale warning in effect through this afternoon...

.early this morning...southwest gales to 40 knots. waves 8 to
11 feet occasionally to 14 feet building to 9 to 12 feet
occasionally to 15 feet. 
.today...southwest gales to 40 knots. waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet. 
.tonight...southwest winds 20 to 30 knots becoming west 10 to
20 knots after midnight, then becoming northwest 5 to 15 knots
late. waves subsiding to calm to 2 feet. 
.monday...north winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...southeast winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday night...south winds 10 to 20 knots veering southwest
after midnight. waves building to 1 to 3 feet. 
.wednesday...southwest winds 10 to 20 knots becoming northeast
5 to 15 knots. waves subsiding to calm to 2 feet. 
.thursday...east winds 5 to 15 knots veering southeast. waves
calm to 2 feet. 

$$