Great Lakes Forecast
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FZUS63 KMQT 231336
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 AM EDT Sat Mar 23 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...High pressure of 30.5 inches over southern Manitoba is
extending ridging into the Great Lakes this morning, but the
surface high will weaken to 30.4 inches as it moves across Upper
Michigan and Lake Superior this afternoon and evening. The high
will shift to southern Quebec on Sunday as deep low pressure of
29.0 inches organizes over eastern Colorado. This low will then
weaken to 29.4 inches as it lifts northeast, crossing western Lake
Superior during Tuesday afternoon. As the low weakens further to
29.5 inches while lifting across northern Ontario during Tuesday
night and Wednesday, high pressure of 30.2 inches will build
southeast through the Dakotas to the Mid- Mississippi Valley.



LSZ162-232145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 AM EDT Sat Mar 23 2024 /836 AM CDT Sat Mar 23 2024/

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...Northwest winds 10 to 20 knots backing west in
the afternoon, then becoming southwest 5 to 15 knots late. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. A chance of snow
through early afternoon, then snow by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...East winds to 30 knots with a few gale force
gusts to 35 knots. Snow. A slight chance of rain after midnight.
Waves building to 5 to 9 feet occasionally to 11 feet.
.MONDAY...East gales to 40 knots. Snow. Waves building to 12 to
17 feet occasionally to 21 feet.
.MONDAY NIGHT...Northeast gales to 40 knots. Rain. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Northeast winds 20 to 30 knots becoming west 15 to
25 knots. Rain, possibly mixed with snow, then a chance of snow
showers, possibly mixed with rain. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.

$$

LSZ263-232145-
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-
936 AM EDT Sat Mar 23 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...North winds 5 to 15 knots backing northwest in
the afternoon, then backing southwest late. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming east 15 to 25 knots
late. A chance of snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...East gales to 40 knots. Snow. Rain by mid afternoon.
Waves building to 10 to 14 feet occasionally to 18 feet.
.MONDAY NIGHT...East gales to 35 knots becoming northeast 20 to
30 knots after midnight. Rain. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...East winds 15 to 25 knots veering west. Rain. A chance
of snow. Waves subsiding to 2 to 4 feet, then building to 3 to 5
feet occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers,
then snow showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ264-232145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 AM EDT Sat Mar 23 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...North winds 5 to 15 knots backing west late.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
snow by mid afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY...East gales to 35 knots. Snow. Waves building to 10 to
14 feet occasionally to 18 feet.
.MONDAY NIGHT...East gales to 35 knots diminishing to 15 to
25 knots after midnight. Rain. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...Southeast winds 15 to 25 knots veering west. Rain.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots. Snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.

$$

LSZ265-232145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 AM EDT Sat Mar 23 2024

.REST OF TODAY...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Scattered snow showers. Waves 2 to 4 feet
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots backing southeast in the
afternoon, then increasing to 15 to 25 knots late. A slight
chance of snow through early afternoon, then snow likely by mid
afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots. Snow. Waves
building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...East winds 20 to 30 knots. Snow. Rain by mid afternoon.
Waves building to 6 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...East winds 15 to 25 knots veering southeast after
midnight. Rain. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.TUESDAY...Southeast winds 15 to 25 knots veering west. Rain,
then a chance of rain and snow showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 20 to 30 knots. A chance of snow showers.
Waves 2 to 4 feet.

$$

LSZ266-232145-
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-
936 AM EDT Sat Mar 23 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...North winds 10 to 20 knots backing northwest
late. Scattered snow showers. Waves 3 to 5 feet occasionally to
7 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southwest after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots late. A chance of snow by mid afternoon. Waves building
to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots. Snow. Waves
building to 6 to 9 feet occasionally to 11 feet.
.MONDAY...East gales to 35 knots. Snow. Rain by mid afternoon.
Waves building to 8 to 12 feet occasionally to 15 feet.
.MONDAY NIGHT...Southeast gales to 35 knots diminishing to
southeast winds 15 to 25 knots after midnight. Rain. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Southeast winds 15 to 25 knots veering west. Rain.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. Snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-232145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 AM EDT Sat Mar 23 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.REST OF TODAY...North winds 10 to 20 knots backing northwest
late. Scattered snow showers. Waves 2 to 4 feet subsiding to calm
to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing southwest late.
Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then backing southeast late. A slight chance of
snow by mid afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots increasing to 30
knots with a few gale force gusts to 35 knots possible late.
Snow. Waves building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Southeast gales to 35 knots. Rain, possibly mixed with
snow. Waves building to 6 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...Southeast gales to 35 knots diminishing to
southeast winds 20 to 30 knots after midnight. Rain. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering south. Rain.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$
LSZ261-232145-
MAFOR 2315/
Superior West 11710 11600 11500 13400 12310. Waves 2 feet or
less.

Superior North Central 12710 11600 14510 11410. Waves 1 to 3 feet
this afternoon. Waves 2 feet or less tonight and Sunday morning.

Superior South Central 12810 12800 11400 11510 12410. Waves 2 to
4 feet subsiding to 1 to 3 feet this afternoon. Waves 2 feet or
less tonight and Sunday morning.

Superior East 11810 19817 11710 19717 12710 11610 11600 11510
11410. Waves 2 to 4 feet this afternoon. Waves 1 to 2 feet
tonight and Sunday morning.

$$

LC

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

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


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