fzus63 kmqt 121351
glfls 
expires:202503122200;;018641

open lake forecast for lake superior
national weather service marquette mi
951 am edt wed mar 12 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...high pressure ridging of 30.0 inches over lake 
superior, extending from a 30.2 inch surface high over quebec, 
weakens to 29.9 inches by this afternoon as a weak low lifts from 
the northern plains into northern ontario today into this evening.
the ridging over the lake remains through thursday before a 
deepening low pressure system drops down to 28.8 inches over 
eastern nebraska friday evening and moves over western lake 
superior at 29.0 inches saturday. the low is expected to exit 
across far northern ontario through sunday morning while troughing
averaging 29.5 inches remains over lake superior through much of 
sunday.



lsz162-122200-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
951 am edt wed mar 12 2025 /851 am cdt wed mar 12 2025/

.rest of today...east winds 5 to 15 knots backing northeast late.
sprinkles and a chance of snow showers by late morning. waves
calm to 2 feet. 
.tonight...east winds 5 to 15 knots veering west after midnight.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. waves calm to
2 feet. 
.thursday night...east winds 10 to 20 knots. waves building to
1 to 3 feet. 
.friday...east winds 10 to 20 knots. a chance of rain showers.
waves subsiding to calm to 2 feet, then building to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of rain showers through
midnight, then rain showers likely after midnight. waves building
to 2 to 4 feet. 
.saturday...east winds 15 to 25 knots becoming northwest gales to
35 knots. rain showers, then a chance of rain and snow showers.
waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.sunday...northwest gales to 35 knots becoming west 15 to
25 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 121351
glfls 
expires:202503122200;;018642

open lake forecast for lake superior
national weather service marquette mi
951 am edt wed mar 12 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...high pressure ridging of 30.0 inches over lake 
superior, extending from a 30.2 inch surface high over quebec, 
weakens to 29.9 inches by this afternoon as a weak low lifts from 
the northern plains into northern ontario today into this evening.
the ridging over the lake remains through thursday before a 
deepening low pressure system drops down to 28.8 inches over 
eastern nebraska friday evening and moves over western lake 
superior at 29.0 inches saturday. the low is expected to exit 
across far northern ontario through sunday morning while troughing
averaging 29.5 inches remains over lake superior through much of 
sunday.



lsz263-122200-
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-
951 am edt wed mar 12 2025

.rest of today...southeast winds 5 to 15 knots backing east late.
a chance of snow showers and sprinkles by late morning. waves
calm to 2 feet. 
.tonight...east winds less than 10 knots becoming southwest 5 to
15 knots after midnight, then veering west late. waves calm to
2 feet. 
.thursday...southwest winds 5 to 15 knots backing east in the
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots. waves building
to 2 to 4 feet. 
.friday...southeast winds 10 to 20 knots becoming east 15 to
25 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.friday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of rain showers. waves building
to 4 to 7 feet occasionally to 9 feet. 
.saturday...east winds 15 to 25 knots becoming west gales to
35 knots. rain showers, then a chance of rain showers, possibly
mixed with snow. waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 5 to 8 feet occasionally to 10 feet. 
.sunday...northwest gales to 40 knots becoming west gales to
35 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet. 

$$