fzus63 kmqt 240201
glfls 
expires:202610240800;;081379

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri oct 23 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...

30.5 inch high pressure over the st. lawrence seaway is extending a 
30.2 inch ridge over lake superior the rest of tonight. by saturday 
afternoon, a 29.2 inch low over northern manitoba drags a 30.1 inch 
trough over the west half of lake superior. the trough remains over 
the lake until saturday night. high pressure of at least 30.6 inches 
over the canadian prairies on sunday and monday pushes ridging of at 
least 30.4 inches over the upper great lakes on sunday. the ridging 
intensifies to 30.6 inches monday night into tuesday morning as the 
high's center moves overhead. the high retreats east into new 
england by wednesday morning. a 29.9 inch low over the northern 
plains early wednesday morning then moves through western lake 
superior throughout the day on wednesday. 




lsz162-240800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt fri oct 23 2026 /900 pm cdt fri oct 23 2026/

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

$$

fzus63 kmqt 240201
glfls 
expires:202610240800;;081380

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri oct 23 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...

30.5 inch high pressure over the st. lawrence seaway is extending a 
30.2 inch ridge over lake superior the rest of tonight. by saturday 
afternoon, a 29.2 inch low over northern manitoba drags a 30.1 inch 
trough over the west half of lake superior. the trough remains over 
the lake until saturday night. high pressure of at least 30.6 inches 
over the canadian prairies on sunday and monday pushes ridging of at 
least 30.4 inches over the upper great lakes on sunday. the ridging 
intensifies to 30.6 inches monday night into tuesday morning as the 
high's center moves overhead. the high retreats east into new 
england by wednesday morning. a 29.9 inch low over the northern 
plains early wednesday morning then moves through western lake 
superior throughout the day on wednesday. 




lsz263-240800-
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 fri oct 23 2026

.rest of tonight...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. patchy dense fog. a slight chance of
showers after midnight. waves calm to 2 feet building to 2 to
4 feet. 
.saturday...south winds 15 to 25 knots becoming southwest 10 to
20 knots late. a chance of showers by mid afternoon. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.saturday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. a chance of showers through midnight. waves subsiding to
1 to 3 feet. 
.sunday...west winds 10 to 20 knots. waves building to 2 to
4 feet. 
.sunday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...north winds 5 to 15 knots veering northeast by mid
afternoon. waves subsiding to calm to 2 feet. 
.monday night...northeast winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.tuesday...east winds 5 to 15 knots veering southeast. a chance
of rain showers. waves calm to 2 feet. 
.wednesday...south winds 10 to 20 knots becoming southwest gales
to 35 knots. a chance of rain showers. waves building to 4 to
7 feet occasionally to 9 feet. 

$$