fzus63 kmqt 172104 aaa
glfls 
expires:202610180515;;273225

open lake forecast for lake superior...updated
national weather service marquette mi
504 pm edt sat oct 17 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 30.5 inch high over the plains slides south of the great lakes 
today before building to 30.6 inches over the mid-atlantic sunday 
morning. this high shifts east into the canadian maritimes into 
sunday night while a 29.1 inch low moves from manitoba to hudson 
bay. this low will bring a 30.0 inch through across western lake 
superior sunday afternoon. high pressure ridging of 30.3 inches 
returns to the upper great lakes by monday. this builds to 30.4 
inches over lake superior monday night and continues building to 
30.5 inches tuesday morning over northern quebec. ridging over lake 
superior will weaken into wednesday. a 30.1 inch trough will move 
through lake superior wednesday night. 




lsz162-180515-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
504 pm edt sat oct 17 2026 /404 pm cdt sat oct 17 2026/

...gale warning in effect from 11 pm edt /10 pm cdt/ this evening
through sunday afternoon...

.late this afternoon...southwest winds 20 to 30 knots. waves 7 to
10 feet occasionally to 13 feet subsiding to 5 to 8 feet
occasionally to 10 feet. 
.tonight...southwest winds 20 to 30 knots increasing to gales to
35 knots after midnight. waves building to 8 to 11 feet
occasionally to 14 feet. 
.sunday...southwest gales to 35 knots diminishing to 20 to
30 knots late. waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 5 to 8 feet occasionally to 10 feet. 
.sunday night...southwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...northeast winds 5 to 15 knots veering east by mid
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 south after
midnight. waves calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing northeast.
waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east. waves
calm to 2 feet. 

$$

fzus63 kmqt 172104 aaa
glfls 
expires:202610180515;;273226

open lake forecast for lake superior...updated
national weather service marquette mi
504 pm edt sat oct 17 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 30.5 inch high over the plains slides south of the great lakes 
today before building to 30.6 inches over the mid-atlantic sunday 
morning. this high shifts east into the canadian maritimes into 
sunday night while a 29.1 inch low moves from manitoba to hudson 
bay. this low will bring a 30.0 inch through across western lake 
superior sunday afternoon. high pressure ridging of 30.3 inches 
returns to the upper great lakes by monday. this builds to 30.4 
inches over lake superior monday night and continues building to 
30.5 inches tuesday morning over northern quebec. ridging over lake 
superior will weaken into wednesday. a 30.1 inch trough will move 
through lake superior wednesday night. 




lsz263-180515-
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-
504 pm edt sat oct 17 2026

...gale warning in effect from 11 pm edt this evening through
sunday afternoon...

.late this afternoon...southwest winds 20 to 30 knots. waves 8 to
11 feet occasionally to 14 feet subsiding to 6 to 9 feet
occasionally to 11 feet. 
.tonight...southwest winds 20 to 30 knots increasing to gales to
35 knots after midnight. waves subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 10 to 14 feet
occasionally to 18 feet. 
.sunday...southwest gales to 40 knots. waves subsiding to 7 to
10 feet occasionally to 13 feet. 
.sunday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. waves subsiding to 1 to 3 feet. 
.monday...north winds less than 10 knots becoming northeast 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.monday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.tuesday night...south winds 10 to 20 knots. waves calm to
2 feet. 
.wednesday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots veering southeast. waves
calm to 2 feet. 

$$