fzus63 kmqt 110300
glfls 
expires:202512110900;;367474

open lake forecast for lake superior
national weather service marquette mi
1000 pm est wed dec 10 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...

tonight, lake superior is between a low pressure of 29.2 inches 
northeast of lake ontario and a broad 30.1 inch ridge over the east 
half of the plains. as the low lifts over the mouth of the st. 
lawrence thursday at 29.0 inches, ridging moves over the mississippi 
river, weakening to 30.0 inches. this ridge moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low vacates to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz162-110900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm est wed dec 10 2025 /900 pm cst wed dec 10 2025/

.rest of tonight...northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight. waves 1 to 3 feet subsiding to calm
to 2 feet. 
.thursday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots veering west by
midnight. a slight chance of snow showers after midnight. waves
calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon. snow showers. waves building to 2 to
4 feet. 
.friday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. a chance of snow showers. waves building
to 3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots. waves subsiding to
3 to 5 feet occasionally to 7 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots becoming southwest gales
to 35 knots. waves subsiding to calm to 2 feet, then building to
4 to 7 feet occasionally to 9 feet. 
.monday...west winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 110300
glfls 
expires:202512110900;;367475

open lake forecast for lake superior
national weather service marquette mi
1000 pm est wed dec 10 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...

tonight, lake superior is between a low pressure of 29.2 inches 
northeast of lake ontario and a broad 30.1 inch ridge over the east 
half of the plains. as the low lifts over the mouth of the st. 
lawrence thursday at 29.0 inches, ridging moves over the mississippi 
river, weakening to 30.0 inches. this ridge moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low vacates to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz263-110900-
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-
1000 pm est wed dec 10 2025

.rest of tonight...northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. waves 3 to 6 feet occasionally to 8 feet
subsiding to 2 to 4 feet. 
.thursday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves subsiding to calm to 2 feet. 
.thursday night...west winds 5 to 15 knots becoming northwest
less than 10 knots by midnight, then becoming west 5 to 15 knots
late. a slight chance of snow showers after midnight. waves calm
to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. waves building to 3 to
6 feet occasionally to 8 feet. 
.friday night...northwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. heavy freezing spray. a chance
of snow showers. waves building to 7 to 10 feet occasionally to
13 feet. 
.saturday...northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. heavy freezing spray. a chance of snow
showers. waves subsiding to 5 to 8 feet occasionally to 10 feet. 
.saturday night...northwest gales to 35 knots becoming north
20 to 30 knots after midnight. heavy freezing spray. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.sunday...northwest winds 10 to 20 knots becoming southwest gales
to 35 knots. waves subsiding to calm to 2 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.monday...west gales to 35 knots diminishing to 15 to 25 knots.
freezing spray. waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$