fzus63 kmqt 192001
glfls 
expires:202604200800;;653299

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun apr 19 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 30.3 inch high over the minnesota/north dakota line this evening 
will build to 30.4 inches over lake michigan monday morning. as the 
high shifts to the lower great lakes monday night, a 29.4 inch low 
over western hudson bay will bring a 29.8 inch trough to the western 
end of the lake. tuesday, the low weakens to 29.6 inches over the 
hudson bay shores as the surface front weakens to 29.9 inches 
throughout its passage over lake superior. 30.1 inch high pressure 
then builds over northern ontario for tuesday night. wednesday, a 
29.2 inch low forms over eastern montana, weakening to 29.3 inches 
over lake winnipeg through friday morning as it sends a 29.6 inch 
trough over the western half of lake superior. the trough fully 
passes over the lake by friday night with the low weakening further 
to 29.6 inches, stationary over southern manitoba.



lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sun apr 19 2026 /300 pm cdt sun apr 19 2026/

.late this afternoon...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.tonight...northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 2 to 4 feet. 
.monday night...southwest 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. 
.tuesday...northwest winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.tuesday night...east winds less than 10 knots. waves calm to
2 feet. 
.wednesday...east winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 10 to 20 knots veering east
after midnight. waves building to 3 to 5 feet occasionally to
7 feet. 
.thursday...east winds 15 to 25 knots increasing to 20 to
30 knots. a chance of rain showers. rain showers likely. waves
building to 5 to 8 feet occasionally to 10 feet. 
.friday...southwest winds 20 to 30 knots becoming west 15 to
25 knots. a chance of rain showers. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 192001
glfls 
expires:202604200800;;653300

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun apr 19 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 30.3 inch high over the minnesota/north dakota line this evening 
will build to 30.4 inches over lake michigan monday morning. as the 
high shifts to the lower great lakes monday night, a 29.4 inch low 
over western hudson bay will bring a 29.8 inch trough to the western 
end of the lake. tuesday, the low weakens to 29.6 inches over the 
hudson bay shores as the surface front weakens to 29.9 inches 
throughout its passage over lake superior. 30.1 inch high pressure 
then builds over northern ontario for tuesday night. wednesday, a 
29.2 inch low forms over eastern montana, weakening to 29.3 inches 
over lake winnipeg through friday morning as it sends a 29.6 inch 
trough over the western half of lake superior. the trough fully 
passes over the lake by friday night with the low weakening further 
to 29.6 inches, stationary over southern manitoba.



lsz263-200800-
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 edt sun apr 19 2026

.late this afternoon...northwest winds 5 to 15 knots. waves 1 to
3 feet. 
.tonight...northwest winds 5 to 15 knots veering north after
midnight, then backing northwest late. waves subsiding to calm to
2 feet. 
.monday...southwest winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon, then becoming south 20 to 30 knots
late. a slight chance of rain and snow showers by mid afternoon.
waves building to 3 to 5 feet occasionally to 7 feet. 
.monday night...southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight, then becoming west 10 to 20 knots
late. waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...southwest winds less than 10 knots backing
southeast after midnight. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots becoming east
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots veering southeast
after midnight. waves building to 3 to 6 feet occasionally to
8 feet. 
.thursday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. rain showers likely. waves building to 8 to 11 feet
occasionally to 14 feet. 
.friday...southwest winds 20 to 30 knots becoming west 15 to
25 knots. a chance of rain showers. waves subsiding to 5 to
8 feet occasionally to 10 feet. 

$$