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000
FZUS63 KMQT 201358
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 AM EDT Sat Apr 20 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 30.6 inch high pressure over the Northern Plains
will weaken to 30.5 inches by this evening as 29.3 inch low
pressure remains over northern Quebec. This high moves to the
central plains by Sunday morning and weakens to 30.3 inches over
the southern plains by Sunday evening. A brief period of 30.1 inch
high pressure meanders south out of the Canadian Prairies Sunday
night into Monday before broad 29.5 inch low pressure begins
moving eastward into the Great Lakes on Tuesday. This low moves
near northern Lake Superior Tuesday morning at 29.5 inches and
progressively weakens to 29.6 inches while heading towards
southern Ontario by Wednesday evening. A 30.3 inch high pressure
over northern Ontario then moves over Lake Superior in its wake
Wednesday.



LSZ162-202200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 AM EDT Sat Apr 20 2024 /858 AM CDT Sat Apr 20 2024/

.REST OF TODAY...Northwest winds 20 to 30 knots becoming west
15 to 25 knots in the afternoon. Waves 3 to 5 feet occasionally
to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming east 15 to 25 knots
by mid afternoon. A chance of rain showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...East winds 15 to 25 knots backing north after
midnight. Rain showers. Snow showers after midnight. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northeast winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain and snow showers. Waves subsiding to
2 to 4 feet.
.WEDNESDAY...East winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ263-202200-
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-
958 AM EDT Sat Apr 20 2024

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

$$

LSZ264-202200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 AM EDT Sat Apr 20 2024

.REST OF TODAY...Northwest winds 15 to 25 knots backing west in
the afternoon, then increasing to 20 to 30 knots late. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon, then veering northeast late. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming northeast
gales to 35 knots after midnight. Rain showers likely. Snow
showers likely after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...North gales to 35 knots diminishing to 15 to 25 knots.
A chance of rain and snow showers. Waves 3 to 5 feet occasionally
to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-202200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 AM EDT Sat Apr 20 2024

.REST OF TODAY...Northwest winds 20 to 30 knots backing west in
the afternoon, then diminishing to 15 to 25 knots late. Waves
3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots increasing to 20 to 30 knots
late. Waves 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon, then becoming north 10 to 20 knots
late. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Rain showers. Waves building to 2 to
4 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A chance of rain and snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-202200-
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-
958 AM EDT Sat Apr 20 2024

.REST OF TODAY...Northwest winds 20 to 30 knots becoming west
15 to 25 knots late. Isolated snow showers by late morning. Waves
4 to 8 feet occasionally to 10 feet.
.TONIGHT...West winds 15 to 25 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest in the
afternoon, then becoming north 15 to 25 knots late. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 15 to 25 knots increasing to gales to
35 knots after midnight. A chance of rain showers through
midnight, then rain showers after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A chance of rain and snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-202200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 AM EDT Sat Apr 20 2024

.REST OF TODAY...Northwest winds 20 to 30 knots backing west
late. Isolated snow showers. Waves 5 to 8 feet occasionally to
10 feet.
.TONIGHT...West winds 20 to 30 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest to
30 knots with a few gale force gusts to 35 knots possible in the
afternoon, then diminishing to 20 to 30 knots late. Waves
building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of rain showers through
midnight, then rain showers likely after midnight. Waves building
to 2 to 4 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain and snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to calm to 2 feet.

$$
LSZ261-202200-
MAFOR 2015/
Superior West 12630 11530 13620 12630. Waves 3 to 5 feet this
afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight.
Waves 3 to 5 feet Sunday morning.

Superior North Central 11730 13640 13630 11730. Waves 3 to 6 feet
this afternoon. Waves 4 to 7 feet subsiding to 3 to 6 feet
tonight. Waves 3 to 6 feet Sunday morning.

Superior South Central 11730 15630 11630. Waves 4 to 7 feet
subsiding to 3 to 6 feet this afternoon. Waves 3 to 5 feet
subsiding to 2 to 4 feet tonight. Waves 3 to 5 feet Sunday
morning.

Superior East 12740 11640 14630 11630. Waves 5 to 8 feet.

$$

LC

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

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