fzus63 kmqt 202101
glfls 
expires:202601210900;;231345

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue jan 20 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...

tonight, a high shifts over the virginias at 30.6 inches while a 
29.7 inch low remains stationary over the hudson bay. meanwhile, a 2 
29.9 inch low forms over the ok panhandle, quickly moving over lake 
michigan by tomorrow morning while the 29.7 inch low drops south 
through ontario. by midday wednesday, 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.



lsz162-210900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est tue jan 20 2026 /300 pm cst tue jan 20 2026/

.late this afternoon...west winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...west winds 15 to 25 knots diminishing to 10 to
20 knots late. a chance of snow showers. waves subsiding to 1 to
3 feet. 
.wednesday...west winds 10 to 20 knots. a chance of snow showers
in the morning, then snow showers likely in the afternoon. waves
subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.wednesday night...northwest winds 15 to 25 knots increasing to
20 to 30 knots by midnight. a slight chance of snow showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...northwest winds 20 to 30 knots. a slight chance of
snow showers. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.thursday night...northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday...northwest winds 15 to 25 knots. a chance of snow
showers. waves subsiding to 1 to 3 feet. 
.friday night...northwest winds 10 to 20 knots. 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 202101
glfls 
expires:202601210900;;231346

open lake forecast for lake superior
national weather service marquette mi
400 pm est tue jan 20 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...

tonight, a high shifts over the virginias at 30.6 inches while a 
29.7 inch low remains stationary over the hudson bay. meanwhile, a 2 
29.9 inch low forms over the ok panhandle, quickly moving over lake 
michigan by tomorrow morning while the 29.7 inch low drops south 
through ontario. by midday wednesday, 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.



lsz263-210900-
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-
400 pm est tue jan 20 2026

...heavy freezing spray warning in effect until 10 pm est this
evening...

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

note, wave height forecasts are for ice free areas.

$$