023
FZUS63 KMQT 180735
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
335 AM EDT Fri Oct 18 2024

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...A low pressure near 29.6 inches continues to weaken
as it pushes eastward over the Northern Plains. The trough further
weakens today into Saturday to 30.1 inches as it moves into
western Lake Superior. High pressure of 30.5 inches over much of
the eastern US will expand westward on Saturday. This brings
ridging of 30.3 inches over eastern Lake Superior Friday night and
Saturday. Weak 29.9 inch troughing skirts Lake Superior Sunday
while a 29.6 inch low organizes over Alberta before beginning its
eastward push Sunday night. This low moves through the Canadian
Prairies Monday before dragging troughing of around 29.9 inches
over Lake Superior late Tuesday.

LSZ162-181545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
335 AM EDT Fri Oct 18 2024 /235 AM CDT Fri Oct 18 2024/

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then backing south late. A chance of showers. Waves
calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming south 5 to 15 knots
late. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots. Showers likely. Waves building to 2 to 4 feet.

$$

LSZ263-181545-
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-
335 AM EDT Fri Oct 18 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers after midnight. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering southwest. Waves
building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering northwest. Rain
showers likely. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ264-181545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
335 AM EDT Fri Oct 18 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...South winds 15 to 25 knots diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers after midnight. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Southwest winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming northwest
20 to 30 knots. Rain showers likely. Waves building to 4 to
7 feet occasionally to 9 feet.

$$

LSZ265-181545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
335 AM EDT Fri Oct 18 2024

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 1 to
3 feet.
.TODAY...South winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon, then increasing to 15 to 25 knots late. Waves
1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing southeast late. A slight
chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest
20 to 30 knots. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ266-181545-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
335 AM EDT Fri Oct 18 2024

.EARLY THIS MORNING...South winds to 30 knots with a few gale
force gusts to 35 knots possible close to the lakeshore. Waves 3
to 6 feet occasionally to 8 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
late. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots veering southwest after
midnight, then diminishing to 10 to 20 knots late. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots. A slight chance
of showers through midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots becoming northwest 20 to
30 knots. Showers. Waves building to 5 to 8 feet occasionally to
10 feet.

$$

LSZ267-181545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
335 AM EDT Fri Oct 18 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...South winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon, then increasing to 20 to 30 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots becoming southwest 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing south late. A slight
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. Waves calm
to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Showers. Waves building to 5 to 8 feet occasionally to
10 feet.

$$

LSZ261-181545-
MAFOR 1809/
Superior West 11530 11540 11530 11520 12410 11420 11510. A chance
of showers overnight. Waves 3 to 5 feet subsiding to 1 to 3 feet
today. Waves 1 to 2 feet tonight.

Superior North Central 13430 12420 11410 12520. Waves 3 to 5 feet
subsiding to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

Superior South Central 15430 11420 11510. Waves 3 to 5 feet
subsiding to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1
to 3 feet tonight.

Superior East 11430 11440 14430 12530. Waves 3 to 6 feet.

$$

WFO MQT

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes