fzus63 kmqt 152005
glfls 
expires:202605160800;;615885

open lake forecast for lake superior
national weather service marquette mi
405 pm 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 29.2 inch low pressure tracking through northern ontario is 
sending 29.5 inch troughing over lake superior late this afternoon. 
this continues to sweep through overnight into early saturday as the 
parent low tracks to near james bay. 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. then, ridging of 30.2 
inches builds over the lake wednesday.



lsz162-160800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
405 pm edt fri may 15 2026 /305 pm cdt fri may 15 2026/

.late this afternoon...southwest winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet. 
.tonight...southwest winds 15 to 25 knots becoming west 10 to
20 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...west winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming northwest 10 to 20 knots
late. waves subsiding to calm to 2 feet. 
.saturday night...north winds 5 to 15 knots becoming east 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
waves building to 2 to 4 feet. 
.sunday...northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. a slight chance of rain showers
through early afternoon, then rain showers likely and a slight
chance of thunderstorms 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 3 to 6 feet occasionally to
8 feet. 
.monday...northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. rain showers likely. waves 3 to 6 feet
occasionally to 8 feet. 
.monday night...northeast gales to 40 knots. rain showers. waves
building to 10 to 14 feet occasionally to 18 feet. 
.tuesday...west gales to 40 knots diminishing to 15 to 25 knots.
a chance of rain showers. waves subsiding to 2 to 4 feet. 
.wednesday...west winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 152005
glfls 
expires:202605160800;;615886

open lake forecast for lake superior
national weather service marquette mi
405 pm 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 29.2 inch low pressure tracking through northern ontario is 
sending 29.5 inch troughing over lake superior late this afternoon. 
this continues to sweep through overnight into early saturday as the 
parent low tracks to near james bay. 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. then, ridging of 30.2 
inches builds over the lake wednesday.



lsz263-160800-
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-
405 pm edt fri may 15 2026

.late this afternoon...southwest winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
waves subsiding to 2 to 4 feet. 
.saturday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet, then building to 2 to 4 feet. 
.saturday night...northeast winds 5 to 15 knots veering east
after midnight. waves subsiding to calm to 2 feet. 
.sunday...east winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. a chance of rain showers and a slight chance of
thunderstorms by mid afternoon. waves building to 6 to 9 feet
occasionally to 11 feet. 
.sunday night...east winds 20 to 30 knots. rain showers and a
chance of thunderstorms. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.monday...northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. rain showers likely and a chance of
thunderstorms. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.monday night...northeast gales to 40 knots. rain showers. waves
building to 10 to 14 feet occasionally to 18 feet. 
.tuesday...west gales to 40 knots diminishing to 20 to 30 knots.
a chance of rain showers. waves subsiding to 8 to 11 feet
occasionally to 14 feet, then building to 9 to 12 feet
occasionally to 15 feet. 
.wednesday...west winds 20 to 30 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$