fzus63 kmqt 120801
glfls 
expires:202610122000;;958858

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon oct 12 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...

lake superior is currently under a 29.8 inch trough associated with 
a 29.5 inch colorado low. to the north, a 30.4 inch high is sprawled 
out over central canada. by this afternoon, the high will weaken to 
30.2 inches along the hudson bay shore of northern ontario while the 
colorado low moves to the missouri river basin, weakening to 29.6 
inches. this low weakens further to 29.7 inches over northern lake 
michigan tuesday morning as the high shifts into quebec. ridging 
dominates over lake superior midweek as the low continues marching 
east and high pressure of 30.2 inches builds over the dakotas by 
wednesday afternoon. the high further builds to 30.3 inches over the 
lake wednesday night while a 29.9 inch low develops over 
saskatchewan. by thursday evening, this low weakens to 30.0 inches 
over northern ontario as the high moves to new england. behind the 
low, a 30.7 inch high builds over eastern montana before expanding 
over the plains for friday.




lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt mon oct 12 2026 /301 am cdt mon oct 12 2026/

...gale warning in effect through late tonight...

.early this morning...northeast gales to 35 knots. a slight
chance of showers. waves 4 to 7 feet occasionally to 9 feet
building to 6 to 9 feet occasionally to 11 feet. 
.today...northeast gales to 40 knots. a chance of showers. waves
building to 8 to 12 feet occasionally to 15 feet. 
.tonight...northeast gales to 35 knots diminishing to 20 to
30 knots late. showers and a slight chance of thunderstorms
through midnight, then a chance of showers after midnight. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 
.tuesday...northeast winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots. waves calm to 2 feet.
.wednesday night...northeast winds 5 to 15 knots veering
southeast after midnight. waves calm to 2 feet. 
.thursday...southwest winds 10 to 20 knots becoming northwest
gales to 40 knots. a chance of showers. waves building to 5 to
8 feet occasionally to 10 feet. 
.friday...northwest gales to 40 knots diminishing to 20 to
30 knots. waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 120801
glfls 
expires:202610122000;;958859

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon oct 12 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...

lake superior is currently under a 29.8 inch trough associated with 
a 29.5 inch colorado low. to the north, a 30.4 inch high is sprawled 
out over central canada. by this afternoon, the high will weaken to 
30.2 inches along the hudson bay shore of northern ontario while the 
colorado low moves to the missouri river basin, weakening to 29.6 
inches. this low weakens further to 29.7 inches over northern lake 
michigan tuesday morning as the high shifts into quebec. ridging 
dominates over lake superior midweek as the low continues marching 
east and high pressure of 30.2 inches builds over the dakotas by 
wednesday afternoon. the high further builds to 30.3 inches over the 
lake wednesday night while a 29.9 inch low develops over 
saskatchewan. by thursday evening, this low weakens to 30.0 inches 
over northern ontario as the high moves to new england. behind the 
low, a 30.7 inch high builds over eastern montana before expanding 
over the plains for friday.




lsz263-122000-
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 mon oct 12 2026

...gale warning in effect until noon edt today...

.early this morning...northeast winds 20 to 30 knots. a chance of
showers. waves 5 to 9 feet occasionally to 11 feet. 
.today...northeast gales to 35 knots diminishing to 20 to
30 knots late. a chance of showers. waves building to 7 to
11 feet occasionally to 14 feet. 
.tonight...northeast winds 20 to 30 knots diminishing to 15 to
25 knots late. a slight chance of thunderstorms through midnight.
showers. waves subsiding to 5 to 8 feet occasionally to 10 feet. 
.tuesday...northeast winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon, then backing west late. a slight
chance of showers through early afternoon. waves subsiding to
1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots. waves calm to 2 feet.
.wednesday night...north winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.thursday...south winds 15 to 25 knots becoming northwest gales
to 45 knots. a chance of rain showers. waves building to 8 to
11 feet occasionally to 14 feet. 
.friday...north gales to 45 knots becoming northwest gales to
40 knots. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 1 to 3 feet. 

$$