fzus63 kmqt 121401
glfls 
expires:202610122000;;972400

open lake forecast for lake superior
national weather service marquette mi
1001 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 29.9 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 as it shifts over 
northern lake michigan tuesday morning while the high progresses 
into quebec, sending 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 29.7 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 30.7 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.




lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon oct 12 2026 /901 am cdt mon oct 12 2026/

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

.rest of today...northeast gales to 40 knots. a chance of
showers. waves 8 to 11 feet occasionally to 14 feet building to
9 to 12 feet occasionally to 15 feet, then subsiding to 8 to
11 feet occasionally to 14 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 121401
glfls 
expires:202610122000;;972401

open lake forecast for lake superior
national weather service marquette mi
1001 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 29.9 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 as it shifts over 
northern lake michigan tuesday morning while the high progresses 
into quebec, sending 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 29.7 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 30.7 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.




lsz263-122000-
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-
1001 am edt mon oct 12 2026

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

.rest of today...northeast winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. a chance of showers. waves 8 to 11 feet
occasionally to 14 feet subsiding to 7 to 10 feet occasionally to
13 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. 

$$