fzus63 kmqt 150801
glfls 
expires:202605152000;;589069

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri may 15 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 29.1 inch low over the canadian prairies will move to northern 
ontario today. this low is expected to bring troughing of 29.6 
inches over lake superior through saturday as it tracks to near 
james bay at 29.2 inches by saturday morning. ridging of 30.1 inches 
builds over the lake from northern ontario saturday night into 
sunday. this is followed by another 29.7 inch trough extending 
northeast toward the upper great lakes from the central plains by 
monday midday, which lingers over the area through tuesday.



lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt fri may 15 2026 /301 am cdt fri may 15 2026/

.early this morning...south winds 10 to 20 knots. waves 3 to
6 feet occasionally to 8 feet. 
.today...southwest winds 10 to 20 knots increasing to 20 to
30 knots. waves subsiding to 3 to 5 feet occasionally to 7 feet,
then building to 4 to 7 feet occasionally to 9 feet. 
.tonight...southwest winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then veering west late. waves subsiding
to calm to 2 feet. 
.saturday...west winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. waves building to 1 to 3 feet, then subsiding to calm to
2 feet. 
.saturday night...northeast winds 5 to 15 knots increasing to
15 to 25 knots after midnight. waves building to 1 to 3 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. a chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. waves
building to 8 to 11 feet occasionally to 14 feet. 
.sunday night...northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. rain showers and a chance of
thunderstorms. waves subsiding to 4 to 7 feet occasionally to
9 feet. 
.monday...northeast winds 15 to 25 knots increasing to gales to
40 knots. rain showers and a chance of thunderstorms. waves
subsiding to 2 to 4 feet, then building to 5 to 8 feet
occasionally to 10 feet. 
.tuesday...northeast gales to 40 knots becoming west 20 to
30 knots. a chance of rain showers. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202605152000;;589070

open lake forecast for lake superior
national weather service marquette mi
401 am edt fri may 15 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 29.1 inch low over the canadian prairies will move to northern 
ontario today. this low is expected to bring troughing of 29.6 
inches over lake superior through saturday as it tracks to near 
james bay at 29.2 inches by saturday morning. ridging of 30.1 inches 
builds over the lake from northern ontario saturday night into 
sunday. this is followed by another 29.7 inch trough extending 
northeast toward the upper great lakes from the central plains by 
monday midday, which lingers over the area through tuesday.



lsz263-152000-
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-
401 am edt fri may 15 2026

.early this morning...south winds 20 to 30 knots. a chance of
showers. waves 4 to 7 feet occasionally to 9 feet. 
.today...south winds 20 to 30 knots becoming southwest 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. waves subsiding to 3 to 6 feet occasionally to 8 feet, then
building to 5 to 8 feet occasionally to 10 feet. 
.tonight...southwest winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then veering west late. waves subsiding
to 2 to 4 feet. 
.saturday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet. 
.saturday night...east winds 5 to 15 knots. waves subsiding to
calm to 2 feet, then building to 1 to 3 feet. 
.sunday...east winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. rain showers likely by mid afternoon.
waves building to 6 to 9 feet occasionally to 11 feet. 
.sunday night...east gales to 35 knots diminishing to 20 to
30 knots after midnight. rain showers and a chance of
thunderstorms. waves subsiding to 4 to 7 feet occasionally to
9 feet. 
.monday...northeast winds 15 to 25 knots increasing to gales to
40 knots. rain showers and a chance of thunderstorms. waves
subsiding to 2 to 4 feet, then building to 5 to 8 feet
occasionally to 10 feet. 
.tuesday...north gales to 40 knots becoming northwest gales to
35 knots. rain showers likely. waves building to 6 to 10 feet
occasionally to 13 feet. 

$$