fzus63 kmqt 221401
glfls 
expires:202604222000;;800340

open lake forecast for lake superior
national weather service marquette mi
1000 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 in 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. by late sunday, this ridge 
builds to 30.1 inches. meanwhile, a 29.3 inch colorado low develops, 
moving towards the upper midwest by early monday, causing pressure 
over lake superior to begin to fall rapidly toward 29.5 by mid-
monday.



lsz162-222000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt wed apr 22 2026 /900 am cdt wed apr 22 2026/

.rest of today...east winds 5 to 15 knots backing northeast in
the afternoon, then increasing to 10 to 20 knots late. waves calm
to 2 feet building to 1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots veering east late. a
slight chance of showers and thunderstorms. waves building to
3 to 5 feet occasionally to 7 feet, then subsiding 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 subsiding to 2 to 4 feet, then 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 and a slight chance of
thunderstorms 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 221401
glfls 
expires:202604222000;;800341

open lake forecast for lake superior
national weather service marquette mi
1000 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 in 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. by late sunday, this ridge 
builds to 30.1 inches. meanwhile, a 29.3 inch colorado low develops, 
moving towards the upper midwest by early monday, causing pressure 
over lake superior to begin to fall rapidly toward 29.5 by mid-
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-
1000 am edt wed apr 22 2026

.rest of today...southeast winds less than 10 knots becoming east
5 to 15 knots in the afternoon, then becoming northeast 10 to
20 knots late. waves calm to 2 feet building to 1 to 3 feet. 
.tonight...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
a chance of rain showers. a slight chance of 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. a slight chance of thunderstorms through early
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. 

$$