fzus63 kmqt 011501
glfls 
expires:202512012100;;825956

open lake forecast for lake superior
national weather service marquette mi
1000 am est mon dec 1 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 30.4 inch high over the lower great lakes this morning moves to 
new england by this evening while a weak 30.0 inch trough descends 
over lake superior from northern ontario. as the trough deepens to 
29.9 inches on tuesday, a 29.7 inch low dives through southern 
saskatchewan into the northern plains. the low weakens slightly to 
29.8 inches tuesday evening as it approaches lake superior. by 
wednesday afternoon, the low deepens to 29.6 inches south of james 
bay while a 30.5 inch high builds over the high plains. the high 
shifts over the central plains thursday morning before moving 
between the great lakes and ohio river valley thursday evening. the 
high arrives over the mid-atlantic states on friday as troughing 
down to 29.7 inches develops over lake superior.



lsz162-012100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est mon dec 1 2025 /900 am cst mon dec 1 2025/

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 011501
glfls 
expires:202512012100;;825957

open lake forecast for lake superior
national weather service marquette mi
1000 am est mon dec 1 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 30.4 inch high over the lower great lakes this morning moves to 
new england by this evening while a weak 30.0 inch trough descends 
over lake superior from northern ontario. as the trough deepens to 
29.9 inches on tuesday, a 29.7 inch low dives through southern 
saskatchewan into the northern plains. the low weakens slightly to 
29.8 inches tuesday evening as it approaches lake superior. by 
wednesday afternoon, the low deepens to 29.6 inches south of james 
bay while a 30.5 inch high builds over the high plains. the high 
shifts over the central plains thursday morning before moving 
between the great lakes and ohio river valley thursday evening. the 
high arrives over the mid-atlantic states on friday as troughing 
down to 29.7 inches develops over lake superior.



lsz263-012100-
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 am est mon dec 1 2025

.rest of today...southwest winds 20 to 30 knots. a chance of snow
showers. waves 4 to 8 feet occasionally to 10 feet. 
.tonight...west winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. a chance of snow showers in the evening.
snow showers likely after midnight. waves subsiding to 2 to
4 feet. 
.tuesday...west winds 10 to 20 knots becoming southwest 15 to
25 knots. a chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tuesday night...southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. snow showers likely. waves
building to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 20 to 30 knots increasing to gales
to 35 knots in the afternoon. a chance of snow showers. freezing
spray in the afternoon. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.wednesday night...northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. freezing spray. waves subsiding to
3 to 6 feet occasionally to 8 feet. 
.thursday...west winds 20 to 30 knots becoming southwest gales to
35 knots. a chance of snow showers. freezing spray. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.friday...west winds 15 to 25 knots becoming northwest 10 to
20 knots. a chance of snow showers. waves subsiding to 2 to
4 feet. 

note, wave height forecasts are for ice free areas.

$$