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(1/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 11/21/2025 4:12 AM America/New_York.
Valid through 11/21/2025 12:15 PM America/New_York.
fzus63 kmqt 210912
glfls
expires:202511211715;;243732
open lake forecast for lake superior
national weather service marquette mi
412 am est fri nov 21 2025
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...
weak ridging of around 30.1 inches pushes into lake superior today
as the parent high pressure builds into the western great lakes the
rest of today into this evening. the ridge then pushes east saturday
as a 29.8 inch trough moves over lake superior saturday afternoon
through saturday night. thereafter, a 30.1 inch high pressure
rebuilds over the great lakes on sunday, sunday night, and even into
monday ahead of a 29.7 low that arrives over or near lake
superior by tuesday.
lsz162-211715-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
412 am est fri nov 21 2025 /312 am cst fri nov 21 2025/
.early this morning...west winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet.
.today...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet.
.tonight...northwest winds 5 to 15 knots backing southwest late.
waves calm to 2 feet.
.saturday...southwest winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then veering west by mid afternoon. a
slight chance of snow showers in the morning. a slight chance of
rain showers. waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.saturday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet.
.sunday...west winds 10 to 20 knots backing southwest in the
afternoon. waves calm to 2 feet.
.sunday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet.
.monday...east winds 5 to 15 knots increasing to 10 to 20 knots.
a chance of rain showers. waves calm to 2 feet.
.tuesday...east winds 15 to 25 knots becoming west 20 to
30 knots. rain showers likely. a chance of snow showers. waves
building to 3 to 6 feet occasionally to 8 feet.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 11/21/2025 4:12 AM America/New_York.
Valid through 11/21/2025 12:15 PM America/New_York.
fzus63 kmqt 210912
glfls
expires:202511211715;;243733
open lake forecast for lake superior
national weather service marquette mi
412 am est fri nov 21 2025
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...
weak ridging of around 30.1 inches pushes into lake superior today
as the parent high pressure builds into the western great lakes the
rest of today into this evening. the ridge then pushes east saturday
as a 29.8 inch trough moves over lake superior saturday afternoon
through saturday night. thereafter, a 30.1 inch high pressure
rebuilds over the great lakes on sunday, sunday night, and even into
monday ahead of a 29.7 low that arrives over or near lake
superior by tuesday.
lsz263-211715-
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-
412 am est fri nov 21 2025
.early this morning...west winds 15 to 25 knots. waves 4 to
7 feet occasionally to 9 feet.
.today...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet.
.tonight...northwest winds 5 to 15 knots backing southwest late.
waves subsiding to calm to 2 feet.
.saturday...southwest winds 5 to 15 knots increasing to 10 to
20 knots by late morning, then veering west by mid afternoon. a
chance of rain and snow showers. waves building to 2 to 4 feet.
.saturday night...west winds 10 to 20 knots veering northwest
after midnight. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.sunday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet.
.sunday night...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet.
.monday...south winds 5 to 15 knots backing southeast. a chance
of rain showers. waves calm to 2 feet.
.tuesday...southeast winds 20 to 30 knots becoming west gales to
35 knots. rain showers likely. waves building to 6 to 9 feet
occasionally to 11 feet.
$$
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