fzus63 kmqt 190201
glfls 
expires:202510190800;;372488

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat oct 18 2025

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 29.6 inch low develops over the mid mississippi valley this 
evening and deepens to at least 29.3 inches on sunday as it crosses 
lower michigan. this low reaches james bay sunday night while a weak 
29.8 inch ridge briefly extends over lake superior. another low 
pressure at 29.5 inches develops upstream over the northern plains, 
tracking east over the region monday night before coalescing into a 
compact 29.4 inch low over the upper great lakes tuesday morning. 
this low elongates from the great lakes to james bay tuesday night 
as it weakens to 29.5 inches, eventually extending from the eastern 
great lakes to james bay by wednesday evening as it moves eastward. 
ridging of 30.1 inches will build over the lake thursday night.



lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt sat oct 18 2025 /901 pm cdt sat oct 18 2025/

.rest of tonight...northwest winds 15 to 25 knots backing west
after midnight, then veering northwest late. a slight chance of
showers by midnight. waves 1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots. waves building to 2 to
4 feet. 
.sunday night...northwest winds 5 to 15 knots backing west after
midnight. waves subsiding to calm to 2 feet. 
.monday...southeast winds 5 to 15 knots becoming east 15 to
25 knots by mid afternoon. a chance of showers. waves building to
2 to 4 feet. 
.monday night...southeast winds 15 to 25 knots veering west after
midnight. showers. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.tuesday...northwest winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tuesday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. rain showers likely through
midnight, then a chance of rain showers after midnight. waves
subsiding to 2 to 4 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of rain showers. waves subsiding to calm to
2 feet. 
.thursday...west winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202510190800;;372489

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt sat oct 18 2025

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 29.6 inch low develops over the mid mississippi valley this 
evening and deepens to at least 29.3 inches on sunday as it crosses 
lower michigan. this low reaches james bay sunday night while a weak 
29.8 inch ridge briefly extends over lake superior. another low 
pressure at 29.5 inches develops upstream over the northern plains, 
tracking east over the region monday night before coalescing into a 
compact 29.4 inch low over the upper great lakes tuesday morning. 
this low elongates from the great lakes to james bay tuesday night 
as it weakens to 29.5 inches, eventually extending from the eastern 
great lakes to james bay by wednesday evening as it moves eastward. 
ridging of 30.1 inches will build over the lake thursday night.



lsz263-190800-
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 pm edt sat oct 18 2025

.rest of tonight...west winds 10 to 20 knots veering northwest
after midnight. a slight chance of showers. waves 1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots. a slight chance of
showers by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then becoming west 5 to 15 knots
late. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves building to 2 to 4 feet. 
.monday night...southeast winds 15 to 25 knots veering west after
midnight. showers. waves building to 3 to 6 feet occasionally to
8 feet. 
.tuesday...west gales to 35 knots veering north by mid afternoon.
showers. waves building to 6 to 10 feet occasionally to 13 feet. 
.tuesday night...north gales to 35 knots diminishing to 20 to
30 knots after midnight. rain showers likely. waves subsiding to
5 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. a chance of rain showers. waves subsiding to 2 to
4 feet. 
.thursday...northwest winds 10 to 20 knots backing west. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 

$$