fzus63 kmqt 041401
glfls 
expires:202604042000;;819635

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 4 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 morning, lake superior is between a low of 29.8 inches in 
southern wisconsin and a high of 30.6 inches over northern quebec. 
the low deepens to 29.7 inches over the straits of mackinac today 
before further deepening to 29.4 inches over western quebec by 
sunday morning. a weak 30.1 inch trough passes over the lake sunday 
night into monday. monday afternoon, 30.6 inch high pressure resides 
over north dakota before moving over wisconsin tuesday morning. the 
high shifts to the lowert great lakes tuesday night as a 29.5 inch 
low organizes along the montana/saskatchewan border. this low moves 
over the northwest angle wednesday night before moving north of the 
lake through thursday morning.



lsz162-042000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sat apr 4 2026 /900 am cdt sat apr 4 2026/

...gale warning in effect until 2 pm edt /1 pm cdt/ this
afternoon...

.rest of today...east gales to 35 knots becoming northeast 20 to
30 knots late. snow by late morning. a slight chance of rain and
sleet. snow showers by mid afternoon. waves 9 to 12 feet
occasionally to 15 feet subsiding to 5 to 8 feet occasionally to
10 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
a chance of snow showers through midnight. waves subsiding to
3 to 5 feet occasionally to 7 feet. 
.sunday...northwest winds 10 to 20 knots backing west in the
afternoon. a slight chance of rain and snow showers by mid
afternoon. waves subsiding to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots becoming northwest 15 to
25 knots after midnight. a chance of rain and snow showers. waves
building to 2 to 4 feet. 
.monday...north winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. a chance of snow showers. waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet. 
.monday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots becoming south 15 to
25 knots. a chance of snow showers, possibly mixed with rain.
waves building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...south winds 15 to 25 knots becoming west 20 to
30 knots. a chance of rain showers, possibly mixed with snow.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 041401
glfls 
expires:202604042000;;819636

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 4 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 morning, lake superior is between a low of 29.8 inches in 
southern wisconsin and a high of 30.6 inches over northern quebec. 
the low deepens to 29.7 inches over the straits of mackinac today 
before further deepening to 29.4 inches over western quebec by 
sunday morning. a weak 30.1 inch trough passes over the lake sunday 
night into monday. monday afternoon, 30.6 inch high pressure resides 
over north dakota before moving over wisconsin tuesday morning. the 
high shifts to the lowert great lakes tuesday night as a 29.5 inch 
low organizes along the montana/saskatchewan border. this low moves 
over the northwest angle wednesday night before moving north of the 
lake through thursday morning.



lsz263-042000-
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 am edt sat apr 4 2026

...gale warning in effect until 2 pm edt this afternoon...

.rest of today...east gales to 35 knots becoming northeast 20 to
30 knots late. rain likely by late morning. snow, possibly mixed
with sleet. a slight chance of rain showers by mid afternoon.
waves 7 to 10 feet occasionally to 13 feet subsiding to 5 to
8 feet occasionally to 10 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 20 to
30 knots after midnight. snow showers likely through midnight,
then a slight chance of snow showers after midnight. waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. waves subsiding to 1 to 3 feet. 
.sunday night...west winds 5 to 15 knots becoming north 15 to
25 knots after midnight. a chance of snow showers, possibly mixed
with rain. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 
.monday...north winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. freezing spray. snow showers likely
through early afternoon. a slight chance of snow showers by mid
afternoon. waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday night...north winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...west winds 10 to 20 knots becoming south 15 to
25 knots. a chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.wednesday...south winds 15 to 25 knots becoming west 20 to
30 knots. a chance of rain showers, possibly mixed with snow.
waves subsiding to 3 to 5 feet occasionally to 7 feet, then
building to 6 to 9 feet occasionally to 11 feet. 

$$