fzus63 kmqt 210920 cca
glfls 
expires:202601212100;;261277

open lake forecast for lake superior...corrected
national weather service marquette mi
420 am est wed jan 21 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 29.9 inch low quickly moves over lake michigan this morning while 
a 29.7 inch low drops south through ontario. the first low will move 
over the michigan lower peninsula at 29.9 inches as the second low 
deepens to 29.6 inches over lake superior by evening. these features 
consolidate into a 29.7 inch low over northeastern ontario wednesday 
night before shifting to quebec thursday morning. in the wake of the 
low, 31.0 inch high pressure will be over saskatchewan, shifting over
the dakotas friday and overspreading the upper midwest at around 
30.7 inches saturday. remnant ridging of at least 30.3 inches remains
over lake superior through sunday.



lsz162-212100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
420 am est wed jan 21 2026 /320 am cst wed jan 21 2026/

...heavy freezing spray warning in effect from late tonight
through friday afternoon...

.early this morning...west winds 10 to 20 knots. a chance of snow
showers. waves 2 to 4 feet. 
.today...west winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. a chance of snow showers. waves 2 to 4 feet. 
.tonight...northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. heavy freezing spray late. a slight chance of snow 
showers. waves building to 4 to 7 feet occasionally to 9 feet. 
.thursday...northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. heavy freezing spray. scattered snow 
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet, then 
building to 4 to 7 feet occasionally to 9 feet. 
.thursday night...northwest winds 20 to 30 knots. heavy freezing
spray. a chance of snow showers. waves subsiding to 3 to 5 feet 
occasionally to 7 feet. 
.friday...northwest winds 15 to 25 knots. heavy freezing spray in the
morning. a chance of snow showers. waves subsiding to 1 to 3 feet. 
.friday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. a chance of snow showers. waves
subsiding to calm to 2 feet. 
.saturday...west winds 5 to 15 knots. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots increasing to 10 to 20 knots.
waves calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 210920 cca
glfls 
expires:202601212100;;261278

open lake forecast for lake superior...corrected
national weather service marquette mi
420 am est wed jan 21 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 29.9 inch low quickly moves over lake michigan this morning while 
a 29.7 inch low drops south through ontario. the first low will move 
over the michigan lower peninsula at 29.9 inches as the second low 
deepens to 29.6 inches over lake superior by evening. these features 
consolidate into a 29.7 inch low over northeastern ontario wednesday 
night before shifting to quebec thursday morning. in the wake of the 
low, 31.0 inch high pressure will be over saskatchewan, shifting over
the dakotas friday and overspreading the upper midwest at around 
30.7 inches saturday. remnant ridging of at least 30.3 inches remains
over lake superior through sunday.



lsz263-212100-
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-
420 am est wed jan 21 2026

...heavy freezing spray warning in effect from this evening
through friday evening...

.early this morning...west winds 10 to 20 knots. a chance of snow
showers. waves 3 to 6 feet occasionally to 8 feet. 
.today...southwest winds 10 to 20 knots veering west by late
morning, then increasing to 15 to 25 knots by mid afternoon. snow
showers likely. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.tonight...northwest winds 15 to 25 knots increasing to 20 to
30 knots by midnight. heavy freezing spray. scattered snow
showers. waves building to 7 to 10 feet occasionally to 13 feet. 
.thursday...northwest winds 20 to 30 knots. heavy freezing spray.
scattered snow showers. waves subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 6 to 9 feet
occasionally to 11 feet. 
.thursday night...northwest winds 20 to 30 knots. heavy freezing
spray. a chance of snow showers in the evening. snow showers
likely after midnight. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.friday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. heavy freezing spray in the morning.
snow showers likely in the morning, then a chance of snow showers
in the afternoon. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.friday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. a chance of snow showers. waves
subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots. waves 1 to 3 feet. 
.sunday...west winds 10 to 20 knots increasing to 15 to 25 knots.
waves subsiding to calm to 2 feet, then building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$