fzus63 kmqt 122001
glfls 
expires:202610130800;;987004

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 remains under a 29.9 inch trough associated with a 
29.6 inch colorado low. to the north, a 30.2 inch high is sprawled 
out over central canada. tonight, the colorado low moves into 
wisconsin, weakening to 29.7 inches. tuesday morning, the high 
progresses into quebec, allowing troughing to 29.8 inches over lake 
superior on tuesday. 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 lake superior wednesday night while a 
29.9 inch low develops over saskatchewan. by thursday evening, this 
low weakens to 29.9 inches over northern ontario as the high moves 
to new england. behind the low, expansive 30.6 inch high builds over 
eastern montana before expanding over the plains for friday. 
pressure increases rapidly over the upper great lakes friday 
afternoon into saturday, reaching 30.4 inches by saturday morning, 
then decreasing to 30.0 inches by saturday night as the high 
collapses southeast.




lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon oct 12 2026 /301 pm cdt mon oct 12 2026/

...gale warning in effect until 11 pm edt /10 pm cdt/ this
evening...

.late this afternoon...northeast gales to 40 knots. a chance of
showers. waves 9 to 12 feet occasionally to 15 feet subsiding to
8 to 11 feet occasionally to 14 feet. 
.tonight...northeast gales to 35 knots diminishing to 20 to
30 knots late. patchy fog through midnight. 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 north 5 to
15 knots in the afternoon, then backing west late. waves
subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.wednesday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...west gales to 35 knots becoming northwest gales
to 40 knots after midnight. waves building to 6 to 9 feet
occasionally to 11 feet. 
.friday...northwest gales to 45 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. 
.saturday...southwest winds 15 to 25 knots increasing to gales to
40 knots. waves building to 6 to 9 feet occasionally to 11 feet. 

$$

fzus63 kmqt 122001
glfls 
expires:202610130800;;987005

open lake forecast for lake superior
national weather service marquette mi
401 pm 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 remains under a 29.9 inch trough associated with a 
29.6 inch colorado low. to the north, a 30.2 inch high is sprawled 
out over central canada. tonight, the colorado low moves into 
wisconsin, weakening to 29.7 inches. tuesday morning, the high 
progresses into quebec, allowing troughing to 29.8 inches over lake 
superior on tuesday. 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 lake superior wednesday night while a 
29.9 inch low develops over saskatchewan. by thursday evening, this 
low weakens to 29.9 inches over northern ontario as the high moves 
to new england. behind the low, expansive 30.6 inch high builds over 
eastern montana before expanding over the plains for friday. 
pressure increases rapidly over the upper great lakes friday 
afternoon into saturday, reaching 30.4 inches by saturday morning, 
then decreasing to 30.0 inches by saturday night as the high 
collapses southeast.




lsz263-130800-
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 pm edt mon oct 12 2026

.late this afternoon...east winds 20 to 30 knots. a chance of
showers. waves 7 to 10 feet occasionally to 13 feet. 
.tonight...east winds 20 to 30 knots backing northeast late.
patchy fog. showers through midnight. a chance of thunderstorms.
a chance of showers after midnight. waves building to 8 to
11 feet occasionally to 14 feet, then 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...west winds 5 to 15 knots veering northwest after
midnight, then increasing to 10 to 20 knots late. waves subsiding
to calm to 2 feet, then building to 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.thursday...south winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves building to 1 to 3 feet. 
.thursday night...west gales to 35 knots becoming northwest storm
force winds to 50 knots after midnight. a chance of rain showers.
waves building to 10 to 14 feet occasionally to 18 feet. 
.friday...northwest storm force winds to 55 knots diminishing to
gales to 40 knots. waves building to 11 to 15 feet occasionally
to 19 feet, then subsiding to 1 to 3 feet. 
.saturday...southwest winds 20 to 30 knots increasing to gales to
35 knots. waves building to 7 to 10 feet occasionally to 13 feet.

$$