fzus63 kmqt 220801
glfls 
expires:202604222000;;787515

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed apr 22 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...

30.0 inch high pressure remains over lake superior today. meanwhile, 
a 29.4 inch low over montana deepens to 29.1 inches by this evening 
before moving into southern manitoba by thursday evening. this sends 
29.6 to 29.7 inch troughing over lake superior thursday night into 
friday. as the parent low weakens to 29.9 inches saturday and 
remnant troughing moves south of the lower great lakes at 29.7 
inches, 30.0 inch ridging will build over lake superior this 
weekend. by late sunday, this ridge builds to 30.2 inches. 
meanwhile, a 29.3 inch colorado low develops, moving towards the 
upper midwest by monday.



lsz162-222000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt wed apr 22 2026 /300 am cdt wed apr 22 2026/

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots becoming northeast 10 to
20 knots late. waves calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots veering east late. a
chance of rain showers and a slight chance of thunderstorms.
waves building to 2 to 4 feet. 
.thursday...east winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing northeast late. a chance
of rain showers and a slight chance of thunderstorms by mid
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday night...northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. rain showers and a chance of
thunderstorms. waves building to 4 to 8 feet occasionally to
10 feet. 
.friday...northeast winds 10 to 20 knots backing northwest by mid
afternoon. rain showers likely through early afternoon, then a
chance of rain showers by mid afternoon. waves subsiding to 3 to
5 feet occasionally to 7 feet. 
.friday night...northwest winds 10 to 20 knots. a chance of rain
showers. waves subsiding to calm to 2 feet. 
.saturday...west winds 10 to 20 knots becoming northeast 5 to
15 knots. waves calm to 2 feet. 
.sunday...east winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 2 to 4 feet. 

$$

fzus63 kmqt 220801
glfls 
expires:202604222000;;787516

open lake forecast for lake superior
national weather service marquette mi
400 am edt wed apr 22 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...

30.0 inch high pressure remains over lake superior today. meanwhile, 
a 29.4 inch low over montana deepens to 29.1 inches by this evening 
before moving into southern manitoba by thursday evening. this sends 
29.6 to 29.7 inch troughing over lake superior thursday night into 
friday. as the parent low weakens to 29.9 inches saturday and 
remnant troughing moves south of the lower great lakes at 29.7 
inches, 30.0 inch ridging will build over lake superior this 
weekend. by late sunday, this ridge builds to 30.2 inches. 
meanwhile, a 29.3 inch colorado low develops, moving towards the 
upper midwest by monday.



lsz263-222000-
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 wed apr 22 2026

.early this morning...southeast winds less than 10 knots. waves
calm to 2 feet. 
.today...southeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.tonight...east winds 10 to 20 knots veering southeast after
midnight. a slight chance of showers and thunderstorms 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 late. a slight chance of rain showers by mid afternoon.
waves building to 7 to 10 feet occasionally to 13 feet. 
.thursday night...east gales to 35 knots. rain showers likely and
a chance of thunderstorms. waves building to 8 to 12 feet
occasionally to 15 feet. 
.friday...east winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. rain showers likely. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.friday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots backing southeast. waves
subsiding to calm to 2 feet. 
.sunday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$