fzus63 kmqt 260201
glfls 
expires:202606260800;;911567

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu jun 25 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... 

this evening, a 30.0 inch high is over lake superior while a 29.9 
inch low is over southern ontario. as the low departs east, the high 
builds to 30.1 inches friday and saturday. meanwhile, broad low 
pressure of at least 29.5 inches deepens in the high plains. by 
sunday afternoon, the high will lift to james bay but keep 30.0 inch 
ridging over the upper great lakes while low pressure remains over 
the plains. high pressure then shifts over lake erie by monday 
morning as 29.5 inch low pressure consolidates over south dakota. 
through monday and tuesday, this low slides north to lake winnipeg 
at around 29.4 inches while the 30.1 inch high shifts off the east 
coast. a lobe of the low pressure then moves across northern ontario 
wednesday at around 29.7 inches, opposing 30.0 inch high pressure 
over the us southeast.




lsz162-260800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt thu jun 25 2026 /900 pm cdt thu jun 25 2026/

.rest of tonight...north winds less than 10 knots. patchy fog
after midnight. waves calm to 2 feet. 
.friday...north winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then veering northeast late. waves
calm to 2 feet. 
.friday night...east winds 5 to 15 knots backing northeast after
midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. a slight chance of showers after
midnight. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.sunday...east winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. a chance of showers. waves building to
2 to 4 feet. 
.sunday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. a chance of showers through midnight. a
chance of thunderstorms. showers likely after midnight. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.monday...east winds 10 to 20 knots backing northeast. a chance
of showers and thunderstorms. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots veering north. a chance
of thunderstorms. showers likely. waves calm to 2 feet. 

$$

fzus63 kmqt 260201
glfls 
expires:202606260800;;911568

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt thu jun 25 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... 

this evening, a 30.0 inch high is over lake superior while a 29.9 
inch low is over southern ontario. as the low departs east, the high 
builds to 30.1 inches friday and saturday. meanwhile, broad low 
pressure of at least 29.5 inches deepens in the high plains. by 
sunday afternoon, the high will lift to james bay but keep 30.0 inch 
ridging over the upper great lakes while low pressure remains over 
the plains. high pressure then shifts over lake erie by monday 
morning as 29.5 inch low pressure consolidates over south dakota. 
through monday and tuesday, this low slides north to lake winnipeg 
at around 29.4 inches while the 30.1 inch high shifts off the east 
coast. a lobe of the low pressure then moves across northern ontario 
wednesday at around 29.7 inches, opposing 30.0 inch high pressure 
over the us southeast.




lsz263-260800-
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 thu jun 25 2026

.rest of tonight...southwest winds less than 10 knots. patchy
dense fog after midnight. waves calm to 2 feet. 
.friday...southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing northeast late. waves
calm to 2 feet. 
.friday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.saturday night...east winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 2 to 4 feet. 
.sunday night...southeast winds 15 to 25 knots. a chance of
showers. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.monday...east winds 15 to 25 knots becoming south 10 to
20 knots. a chance of showers and thunderstorms. waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to
3 feet. 
.tuesday...southwest winds 5 to 15 knots. a chance of
thunderstorms. showers likely. waves subsiding to calm to 2 feet.

$$