fzus63 kmqt 151401
glfls 
expires:202610152000;;140451

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu oct 15 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...

two 29.9 inch lows, one over lake winnipeg and the other over 
northern illinois late this morning and early this afternoon, merge 
with one another to form a 29.6 inch low over lower michigan and 
lake huron tonight. in its wake, a 30.9 inch high lifts off of the 
central rockies into the great plains on friday, weakening to 30.6 
inches as it does so while the aforementioned low deepens to 29.4 
inches and heads towards the mouth of the st. lawrence river. the 
high slides south of the great lakes at 30.5 inches by saturday 
night as a 29.4 inch alberta clipper moves through the canadian 
prairies towards hudson bay, deepening to 29.0 inches by the time it 
arrives on sunday. this low is projected to bring troughing of 29.9 
inches over lake superior. as the low moves east over hudson bay and 
weakens with time sunday night into monday, expect high pressure 
ridging of 30.3 inches to return to the upper great lakes. the high 
pressure ridging strengthens to 30.4 inches over lake superior by 
tuesday. 




lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt thu oct 15 2026 /901 am cdt thu oct 15 2026/

...gale warning in effect from late tonight through friday
afternoon...

.rest of today...south winds 5 to 15 knots veering southwest
late. a chance of showers by late morning, then showers by mid
afternoon. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots becoming northwest 15 to
25 knots after midnight, then becoming north gales to 40 knots
late. a chance of showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.friday...north gales to 40 knots diminishing to 20 to 30 knots
late. waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday night...northwest winds 10 to 20 knots becoming southwest
20 to 30 knots after midnight. waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet. 
.saturday...southwest gales to 35 knots. waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 
.saturday night...southwest gales to 40 knots. waves building to
8 to 11 feet occasionally to 14 feet. 
.sunday...southwest gales to 40 knots becoming west 20 to
30 knots. waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots veering north. waves calm to
2 feet. 

$$

fzus63 kmqt 151401
glfls 
expires:202610152000;;140452

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu oct 15 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...

two 29.9 inch lows, one over lake winnipeg and the other over 
northern illinois late this morning and early this afternoon, merge 
with one another to form a 29.6 inch low over lower michigan and 
lake huron tonight. in its wake, a 30.9 inch high lifts off of the 
central rockies into the great plains on friday, weakening to 30.6 
inches as it does so while the aforementioned low deepens to 29.4 
inches and heads towards the mouth of the st. lawrence river. the 
high slides south of the great lakes at 30.5 inches by saturday 
night as a 29.4 inch alberta clipper moves through the canadian 
prairies towards hudson bay, deepening to 29.0 inches by the time it 
arrives on sunday. this low is projected to bring troughing of 29.9 
inches over lake superior. as the low moves east over hudson bay and 
weakens with time sunday night into monday, expect high pressure 
ridging of 30.3 inches to return to the upper great lakes. the high 
pressure ridging strengthens to 30.4 inches over lake superior by 
tuesday. 




lsz263-152000-
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 thu oct 15 2026

...gale warning in effect from late tonight through friday
afternoon...

.rest of today...south winds 5 to 15 knots. a chance of showers
by late morning, then showers by mid afternoon. waves calm to
2 feet. 
.tonight...west winds 10 to 20 knots becoming north 15 to
25 knots after midnight, then increasing to gales to 40 knots
late. showers through midnight, then a chance of showers after
midnight. waves building to 6 to 9 feet occasionally to 11 feet. 
.friday...north gales to 40 knots diminishing to 20 to 30 knots
late. a slight chance of rain showers through early afternoon.
waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet. 
.friday night...northwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet. 
.saturday...southwest gales to 40 knots. waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet. 
.saturday night...southwest gales to 45 knots. waves building to
10 to 14 feet occasionally to 18 feet. 
.sunday...southwest storm force winds to 50 knots becoming west
gales to 35 knots. waves subsiding to 1 to 3 feet. 
.monday...west winds 5 to 15 knots. waves subsiding to calm to
2 feet. 

$$