fzus63 kmqt 190801
glfls 
expires:202604192000;;625049

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

ridging builds over the lake today, strengthening to 30.3 inches by 
tonight and remaining into monday morning. this ridging gives way to 
29.8 inch troughing monday night into tuesday morning as a weakening 
low swings from hudson bay towards northern quebec. high pressure 
builds back in over lake superior to 30.0 to 30.1 inches tuesday 
night into wednesday morning. the high shifts east on wednesday as 
29.2 inch low pressure develops over the northern plains. the low 
deepens to 29.1 inches on thursday over north dakota, then moves 
north into southern manitoba thursday night into friday. this sends 
a 29.5 inch trough across the lake thursday night through friday.



lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt sun apr 19 2026 /300 am cdt sun apr 19 2026/

.early this morning...northwest winds 15 to 25 knots. waves 2 to
4 feet. 
.today...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. waves subsiding to calm to 2 feet. 
.tonight...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. 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 5 to 15 knots. waves calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming northeast 10 to
20 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...east winds 10 to 20 knots increasing to 20 to
30 knots. a chance of rain showers, then rain showers likely.
waves subsiding to 3 to 5 feet occasionally to 7 feet, then
building to 6 to 9 feet occasionally to 11 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202604192000;;625050

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

ridging builds over the lake today, strengthening to 30.3 inches by 
tonight and remaining into monday morning. this ridging gives way to 
29.8 inch troughing monday night into tuesday morning as a weakening 
low swings from hudson bay towards northern quebec. high pressure 
builds back in over lake superior to 30.0 to 30.1 inches tuesday 
night into wednesday morning. the high shifts east on wednesday as 
29.2 inch low pressure develops over the northern plains. the low 
deepens to 29.1 inches on thursday over north dakota, then moves 
north into southern manitoba thursday night into friday. this sends 
a 29.5 inch trough across the lake thursday night through friday.



lsz263-192000-
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 am edt sun apr 19 2026

.early this morning...northwest winds 15 to 25 knots. waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.today...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. flurries by mid afternoon. waves
subsiding to 1 to 3 feet. 
.tonight...northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then backing northwest late. flurries
through midnight. waves subsiding to calm to 2 feet. 
.monday...southwest winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon, then backing south late. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots veering west after
midnight. waves building to 3 to 5 feet occasionally to 7 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 5 to 15 knots becoming east 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. a chance of rain showers. waves building to 7 to
10 feet occasionally to 13 feet. 

$$