fzus63 kmqt 220201
glfls 
expires:202603220800;;086488

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sat mar 21 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 back-door cold front in association with a 29.5 inch clipper 
passes over the lake tonight, followed by a 30.4 inch ridge building 
over the great lakes for sunday and monday. another clipper low, 
this one around 29.9 inches, tracks across northern ontario and 
briefly extends a 30.1 inch trough over lake superior tuesday 
morning. 30.3 inch ridging quickly builds back in on tuesday night 
and remains until wednesday morning. another clipper low around 29.7 
inches phases with a shortwave low lifting off of the northern 
rockies on wednesday, bringing troughing of at least 29.8 inches 
back across lake superior by thursday morning.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt sat mar 21 2026 /900 pm cdt sat mar 21 2026/

.rest of tonight...northeast winds 15 to 25 knots. a chance of
rain and snow showers by midnight. waves 3 to 5 feet occasionally
to 7 feet building to 4 to 7 feet occasionally to 9 feet. 
.sunday...northeast winds 15 to 25 knots becoming east 10 to
20 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.sunday night...southeast winds 5 to 15 knots veering southwest
after midnight, then veering west late. waves subsiding to calm
to 2 feet. 
.monday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.monday night...south winds 10 to 20 knots veering west after
midnight. a slight chance of rain and snow showers after
midnight. waves calm to 2 feet. 
.tuesday...north winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.tuesday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 4 to 7 feet
occasionally to 9 feet. 
.wednesday...east winds 10 to 20 knots increasing to 20 to
30 knots. a chance of snow showers. a chance of rain showers.
waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet. 
.thursday...north winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 220201
glfls 
expires:202603220800;;086489

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt sat mar 21 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 back-door cold front in association with a 29.5 inch clipper 
passes over the lake tonight, followed by a 30.4 inch ridge building 
over the great lakes for sunday and monday. another clipper low, 
this one around 29.9 inches, tracks across northern ontario and 
briefly extends a 30.1 inch trough over lake superior tuesday 
morning. 30.3 inch ridging quickly builds back in on tuesday night 
and remains until wednesday morning. another clipper low around 29.7 
inches phases with a shortwave low lifting off of the northern 
rockies on wednesday, bringing troughing of at least 29.8 inches 
back across lake superior by thursday morning.



lsz263-220800-
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 pm edt sat mar 21 2026

.rest of tonight...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of rain and snow showers
by midnight. freezing spray after midnight. waves 4 to 8 feet
occasionally to 10 feet. 
.sunday...northeast winds 20 to 30 knots diminishing to 10 to
20 knots. freezing spray through early afternoon. a slight chance
of snow showers. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.sunday night...northeast winds 5 to 15 knots becoming west less
than 10 knots after midnight, then increasing to 5 to 15 knots
late. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.monday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. a slight chance of rain and snow
showers after midnight. waves building to 2 to 4 feet. 
.tuesday...north winds 5 to 15 knots veering northeast by mid
afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...east winds 15 to 25 knots. freezing spray after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.wednesday...east winds 15 to 25 knots increasing to 20 to
30 knots. a chance of snow showers. a chance of rain showers.
waves subsiding to 3 to 5 feet occasionally to 7 feet, then
building to 5 to 8 feet occasionally to 10 feet. 
.thursday...north winds 20 to 30 knots diminishing to 15 to
25 knots. a chance of rain and snow showers. freezing spray.
waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 

$$