fzus63 kmqt 280204 cca
glfls 
expires:202604280800;;643845

open lake forecast for lake superior...corrected
national weather service marquette mi
1004 pm edt mon apr 27 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 29.4 inch low over the u.p. lifts into lake superior tonight as it 
deepens to 29.3 inches. the low exits the lake and reaches james bay 
tuesday afternoon while 30.1 inch high pressure continues over the 
canadian prairie. as the low continues departing to the northeast, 
the high builds to 30.2 inches while a 29.8 inch low expands over 
the eastern seaboard on wednesday. by thursday night, the 30.2 inch 
high spans from hudson bay to the central plains while the low 
pressure of now 29.6 inches is just off cape cod. high pressure 
ridging over lake superior reaches its zenith of 30.2 inches by 
saturday, before a weak trough of around 29.8 inches passes through 
the lake saturday night into sunday.



lsz162-280800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1004 pm edt mon apr 27 2026 /904 pm cdt mon apr 27 2026/

.rest of tonight...northwest winds 15 to 25 knots backing west
after midnight, then increasing to 20 to 30 knots late. rain
showers likely. waves 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 10 to
20 knots late. waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.friday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.saturday...south winds 5 to 15 knots veering west. waves calm to
2 feet. 

$$

fzus63 kmqt 280204 cca
glfls 
expires:202604280800;;643846

open lake forecast for lake superior...corrected
national weather service marquette mi
1004 pm edt mon apr 27 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 29.4 inch low over the u.p. lifts into lake superior tonight as it 
deepens to 29.3 inches. the low exits the lake and reaches james bay 
tuesday afternoon while 30.1 inch high pressure continues over the 
canadian prairie. as the low continues departing to the northeast, 
the high builds to 30.2 inches while a 29.8 inch low expands over 
the eastern seaboard on wednesday. by thursday night, the 30.2 inch 
high spans from hudson bay to the central plains while the low 
pressure of now 29.6 inches is just off cape cod. high pressure 
ridging over lake superior reaches its zenith of 30.2 inches by 
saturday, before a weak trough of around 29.8 inches passes through 
the lake saturday night into sunday.



lsz263-280800-
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-
1004 pm edt mon apr 27 2026

...gale warning in effect from 5 am edt tuesday through tuesday
afternoon...

.rest of tonight...southeast winds 15 to 25 knots veering west
after midnight, then increasing to 20 to 30 knots late. a chance
of rain showers. waves 5 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet. 
.tuesday...west gales to 35 knots diminishing to 15 to 25 knots
late. a slight chance of rain showers through early afternoon.
waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.wednesday night...north winds less than 10 knots increasing to
5 to 15 knots after midnight. waves calm to 2 feet. 
.thursday...north winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.thursday night...northwest winds less than 10 knots becoming
north 5 to 15 knots after midnight. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.saturday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$