fzus63 kmqt 212001
glfls 
expires:202603220800;;074118

open lake forecast for lake superior
national weather service marquette mi
400 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 clipper around 29.5 inches dives through the western great lakes 
into lower michigan the rest of today into this evening. the back-
door cold front of the 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-
400 pm edt sat mar 21 2026 /300 pm cdt sat mar 21 2026/

.late this afternoon...northeast winds 15 to 25 knots. waves 1 to
3 feet building to 2 to 4 feet. 
.tonight...northeast winds 15 to 25 knots. a slight chance of
rain and snow showers through midnight. waves 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. 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 212001
glfls 
expires:202603220800;;074119

open lake forecast for lake superior
national weather service marquette mi
400 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 clipper around 29.5 inches dives through the western great lakes 
into lower michigan the rest of today into this evening. the back-
door cold front of the 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-
400 pm edt sat mar 21 2026

.late this afternoon...north winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...northeast winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a chance of rain and snow showers
through midnight. freezing spray after midnight. waves building
to 5 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. 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. 

$$