fzus63 kmqt 030801
glfls 
expires:202605032000;;935235

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun may 3 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 29.6 inch trough moves over lake superior this morning as a low 
over central minnesota lifts into northern ontario. a deepening 29.3 
inch low digs over the canadian prairies tonight and then deepens to 
29.0 inches over northern ontario on monday; bringing 29.2 inch 
troughing over northern lake superior monday morning. the low lifts 
into james bay by monday evening as 30.1 inch ridging builds just to 
the east of the canadian rockies. as the high pressure ridging 
shifts to the canadian prairies tuesday and wednesday, the now 29.2 
inch low continues lifting into far northern quebec. we can thus 
expect ridging to slowly build back over lake superior to around 
29.9 to 30.0 inches by the middle of next week as the ridging 
spreads into the rest of the central conus. the ridging over lake 
superior does look to weaken to around 29.8 to 29.9 inches by 
thursday night and friday as the upper great lakes become sandwiched 
between a low just off of the new england coast and troughing on the 
lee of the rockies.



lsz162-032000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun may 3 2026 /301 am cdt sun may 3 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...west winds 10 to 20 knots backing southwest late. waves
calm to 2 feet. 
.tonight...southwest winds 10 to 20 knots increasing to 20 to
30 knots. a chance of rain showers. waves building to 3 to 5 feet
occasionally to 7 feet. 
.monday...west winds 20 to 30 knots diminishing to 15 to 25 knots
late. a chance of rain showers. waves subsiding to 2 to 4 feet. 
.monday night...northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.tuesday...west winds 10 to 20 knots. waves calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.wednesday...southwest winds 5 to 15 knots veering northwest.
waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots veering west. waves
calm to 2 feet. 

$$

fzus63 kmqt 030801
glfls 
expires:202605032000;;935236

open lake forecast for lake superior
national weather service marquette mi
401 am edt sun may 3 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 29.6 inch trough moves over lake superior this morning as a low 
over central minnesota lifts into northern ontario. a deepening 29.3 
inch low digs over the canadian prairies tonight and then deepens to 
29.0 inches over northern ontario on monday; bringing 29.2 inch 
troughing over northern lake superior monday morning. the low lifts 
into james bay by monday evening as 30.1 inch ridging builds just to 
the east of the canadian rockies. as the high pressure ridging 
shifts to the canadian prairies tuesday and wednesday, the now 29.2 
inch low continues lifting into far northern quebec. we can thus 
expect ridging to slowly build back over lake superior to around 
29.9 to 30.0 inches by the middle of next week as the ridging 
spreads into the rest of the central conus. the ridging over lake 
superior does look to weaken to around 29.8 to 29.9 inches by 
thursday night and friday as the upper great lakes become sandwiched 
between a low just off of the new england coast and troughing on the 
lee of the rockies.



lsz263-032000-
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-
401 am edt sun may 3 2026

.early this morning...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. waves building to 1 to 3 feet. 
.tonight...southwest winds 10 to 20 knots increasing to 20 to
30 knots. a chance of rain showers. waves building to 3 to 6 feet
occasionally to 8 feet. 
.monday...southwest winds 20 to 30 knots veering west in the
afternoon, then diminishing to 15 to 25 knots late. 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. 
.monday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to 2 to 4 feet. 
.tuesday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet. 
.tuesday night...west winds 5 to 15 knots veering northwest after
midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots. waves calm to 2 feet. 
.thursday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$