fzus63 kmqt 131339
glfls 
expires:202503132145;;074640

open lake forecast for lake superior
national weather service marquette mi
939 am edt thu mar 13 2025

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...weak troughing of 29.8 inches over lake superior 
this morning becomes weak ridging of 29.9 inches as a low 
pressure system begins developing off of the rocky mountains 
today. the low bottoms out to 28.8 inches over the central plains 
friday afternoon before lifting through western lake superior at 
28.9 inches saturday. remnant troughing over the lake weakens from
29.3 inches to around 29.7 inches sunday behind the low before 
ridging of 30.0 inches moves over late sunday night through 
monday. 

 


lsz162-132145-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
939 am edt thu mar 13 2025 /839 am cdt thu mar 13 2025/

...dense fog advisory in effect until 11 am edt /10 am cdt/ this
morning...

.rest of today...southwest winds 5 to 15 knots backing east in
the afternoon, then increasing to 10 to 20 knots late. waves calm
to 2 feet building to 2 to 4 feet. 
.tonight...east winds 10 to 20 knots. waves 2 to 4 feet. 
.friday...east winds 10 to 20 knots becoming northeast 15 to
25 knots late. a chance of rain showers and a slight chance of
thunderstorms. waves subsiding to 1 to 3 feet, then building to
2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots. a chance of rain
showers through midnight. a slight chance of thunderstorms. rain
showers likely after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...east winds 10 to 20 knots backing northeast by mid
afternoon. rain showers. waves subsiding to 1 to 3 feet. 
.saturday night...west winds 20 to 30 knots becoming northwest
gales to 35 knots after midnight. a chance of rain showers,
possibly mixed with snow. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northwest gales to 35 knots becoming west 15 to
25 knots. waves subsiding to 1 to 3 feet. 
.monday...west winds 10 to 20 knots veering northeast. waves
subsiding to calm to 2 feet. 

$$