fzus63 kmqt 042001
glfls 
expires:202604050800;;835229

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

a 29.7 inch low over northern lake michigan tracks over the straits 
of mackinac this evening 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 lower 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.



lsz162-050800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sat apr 4 2026 /300 pm cdt sat apr 4 2026/

.late this afternoon...northeast winds 20 to 30 knots. snow
showers, possibly mixed with rain. 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. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to 20 knots
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 10 to 20 knots veering northwest after
midnight, then increasing to 20 to 30 knots late. a chance of
snow showers, possibly mixed with rain. waves building to 2 to
4 feet. 
.monday...north winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. a slight chance of snow showers
through early afternoon. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 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...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. a chance of snow showers, possibly
mixed with rain after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.wednesday...south winds 15 to 25 knots becoming west 20 to
30 knots. rain showers likely, possibly mixed with snow showers,
then a chance of rain showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.thursday...west winds 20 to 30 knots becoming east 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
2 to 4 feet. 

$$

fzus63 kmqt 042001
glfls 
expires:202604050800;;835230

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

a 29.7 inch low over northern lake michigan tracks over the straits 
of mackinac this evening 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 lower 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.



lsz263-050800-
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-
400 pm edt sat apr 4 2026

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

$$