fzus63 kmqt 180201
glfls 
expires:202603180800;;874985

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt tue mar 17 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 30.1 ridge departing the upper great lakes this evening gives way 
to a weakening 29.7 inch clipper low moving across the canadian 
prairies and northern ontario tonight into wednesday. behind this 
low, weak ridging of around 30.1 inches returns over lake superior 
on thursday ahead of another clipper low approaching the region on 
friday at around 29.7 inches. another pair of clipper lows moving 
through the plains and northern ontario this weekend brings 
troughing down to around 29.6 inches over lake superior by saturday 
ahead of a cold front, before ridging behind the front increases up 
to around 30.4 inches by sunday.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt tue mar 17 2026 /900 pm cdt tue mar 17 2026/

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

$$

fzus63 kmqt 180201
glfls 
expires:202603180800;;874986

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt tue mar 17 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 30.1 ridge departing the upper great lakes this evening gives way 
to a weakening 29.7 inch clipper low moving across the canadian 
prairies and northern ontario tonight into wednesday. behind this 
low, weak ridging of around 30.1 inches returns over lake superior 
on thursday ahead of another clipper low approaching the region on 
friday at around 29.7 inches. another pair of clipper lows moving 
through the plains and northern ontario this weekend brings 
troughing down to around 29.6 inches over lake superior by saturday 
ahead of a cold front, before ridging behind the front increases up 
to around 30.4 inches by sunday.



lsz263-180800-
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 tue mar 17 2026

.rest of tonight...south winds 10 to 20 knots. a chance of snow
showers. waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday...southwest winds 10 to 20 knots becoming west 15 to
25 knots late. a slight chance of snow showers through early
afternoon. waves 3 to 5 feet occasionally to 7 feet. 
.wednesday night...west winds 5 to 15 knots veering north late. a
slight chance of rain showers. waves subsiding to calm to 2 feet.
.thursday...northeast winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.thursday night...southwest winds 5 to 15 knots. a chance of snow
and rain showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots. a chance of snow
showers. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots becoming south 10 to
20 knots after midnight. waves building to 2 to 4 feet. 
.saturday...southeast winds 10 to 20 knots becoming northeast
20 to 30 knots. a chance of snow showers, possibly mixed with
rain. waves building to 4 to 7 feet occasionally to 9 feet. 
.sunday...north winds 20 to 30 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet. 

$$