fzus63 kmqt 201401
glfls 
expires:202603202000;;007263

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri mar 20 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 clipper low over western lake superior this morning 
moves over the lower great lakes by this afternoon, replaced briefly 
by 30.0 inch high pressure over the lake tonight. troughing of around 
29.6 inches returns to the lake on saturday as a 29.4 inch low moves 
onto the northern plains this weekend. behind the troughing, 30.4 
inch ridging builds into the great lakes and northern plains by 
monday. a 29.8 inch clipper low tracking across northern ontario on 
tuesday briefly extends a 30.0 inch trough over the lake. a 30.5 
inch high quickly follows behind it for wednesday.



lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt fri mar 20 2026 /900 am cdt fri mar 20 2026/

.rest of today...west winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots backing east late. waves calm
to 2 feet. 
.saturday...east winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then backing northeast late. snow showers
likely through early afternoon. a chance of rain showers. a
slight chance of snow showers by mid afternoon. waves building to
1 to 3 feet. 
.saturday night...northeast winds 15 to 25 knots. a chance of
rain and snow showers. waves building to 3 to 6 feet occasionally
to 8 feet. 
.sunday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a slight chance of snow showers. waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet. 
.sunday night...east winds 5 to 15 knots veering west after
midnight. waves subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots. a chance of snow showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.tuesday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 201401
glfls 
expires:202603202000;;007264

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri mar 20 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 clipper low over western lake superior this morning 
moves over the lower great lakes by this afternoon, replaced briefly 
by 30.0 inch high pressure over the lake tonight. troughing of around 
29.6 inches returns to the lake on saturday as a 29.4 inch low moves 
onto the northern plains this weekend. behind the troughing, 30.4 
inch ridging builds into the great lakes and northern plains by 
monday. a 29.8 inch clipper low tracking across northern ontario on 
tuesday briefly extends a 30.0 inch trough over the lake. a 30.5 
inch high quickly follows behind it for wednesday.



lsz263-202000-
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 fri mar 20 2026

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

$$