fzus63 kmqt 180201
glfls 
expires:202604180800;;553956

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri apr 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 low of around 29.4 inches will move from just north of lake 
superior to the hudson bay overnight. behind it, ridging builds over 
the lake, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging quickly gives way to 29.8 inch 
troughing monday night into tuesday morning as a weakening low 
swings from the hudson bay shoreline of far northern ontario into 
james bay. high pressure ridging builds back to 30.2 inches over 
lake superior by tuesday night. the high will shift east on 
wednesday as a 29.2 inch low pressure develops over the high plains.



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

.rest of tonight...west winds 20 to 30 knots. waves 3 to 6 feet
occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible in the afternoon,
then diminishing to 20 to 30 knots late. a slight chance of snow
showers. waves building to 4 to 7 feet occasionally to 9 feet. 
.saturday night...west winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. a slight chance of snow showers
through midnight. waves subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering north after
midnight. waves calm to 2 feet. 
.monday...south winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots veering west after
midnight. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.tuesday...west winds 10 to 20 knots becoming northeast 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 2 to 4 feet. 

$$

fzus63 kmqt 180201
glfls 
expires:202604180800;;553957

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt fri apr 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 low of around 29.4 inches will move from just north of lake 
superior to the hudson bay overnight. behind it, ridging builds over 
the lake, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging quickly gives way to 29.8 inch 
troughing monday night into tuesday morning as a weakening low 
swings from the hudson bay shoreline of far northern ontario into 
james bay. high pressure ridging builds back to 30.2 inches over 
lake superior by tuesday night. the high will shift east on 
wednesday as a 29.2 inch low pressure develops over the high plains.



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 fri apr 17 2026

...gale warning in effect from 4 am edt saturday through saturday
evening...

.rest of tonight...west winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a chance of rain showers. waves 3 to
5 feet occasionally to 7 feet building to 5 to 8 feet
occasionally to 10 feet. 
.saturday...west gales to 35 knots. a slight chance of snow
showers. waves building to 7 to 11 feet occasionally to 14 feet. 
.saturday night...northwest gales to 35 knots diminishing to
15 to 25 knots. a slight chance of snow showers through midnight.
waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...northwest winds 5 to 15 knots veering north after
midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves building to 3 to 5 feet occasionally to
7 feet. 
.monday night...south winds 20 to 30 knots veering west after
midnight. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 10 to 20 knots becoming east 5 to 15 knots.
waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet. 

$$