683
FZUS63 KMQT 191338
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
938 AM EDT Sat Apr 19 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...30.2 inch of high pressure over the northern plains
will move into the upper Great Lakes by this evening. This high
will strengthen to 30.5 inches over the Upper Great Lakes by
Sunday morning and will give way to a low pressure lifting into
the Upper Great Lakes at around 29.5 inches by Monday morning.
Behind the low, weak ridging of around 30.1 inches moves back
over Lake Superior on Tuesday into Wednesday.

LSZ162-192145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
938 AM EDT Sat Apr 19 2025 /838 AM CDT Sat Apr 19 2025/

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

$$

LSZ263-192145-
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-
938 AM EDT Sat Apr 19 2025

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

$$

LSZ264-192145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
938 AM EDT Sat Apr 19 2025

.REST OF TODAY...North winds 10 to 20 knots backing northwest in
the afternoon, then becoming west 5 to 15 knots late. Waves 2 to
4 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming south 5 to 15 knots late.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots backing east after
midnight. A chance of rain showers after midnight. Waves building
to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots backing north by mid
afternoon. Snow showers likely through early afternoon. Rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.TUESDAY...North winds 5 to 15 knots veering southeast. A chance
of rain showers. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west. Waves
subsiding to calm to 2 feet.

$$

LSZ265-192145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
938 AM EDT Sat Apr 19 2025

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

$$

LSZ266-192145-
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-
938 AM EDT Sat Apr 19 2025

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

$$

LSZ267-192145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
938 AM EDT Sat Apr 19 2025

.REST OF TODAY...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming east
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.MONDAY...East winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. Rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...North winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering east. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering southwest. A
chance of rain showers. Waves calm to 2 feet.

$$
LSZ261-192145-
MAFOR 1915/
Superior West 12610 11510 11500 11400 12300 11400. Waves 2 feet
or less.

Superior North Central 12720 11710 11610 12500 11400 11410. Waves
2 to 4 feet subsiding to 1 to 3 feet this afternoon. Waves 1 to 2
feet tonight and Sunday morning.

Superior South Central 13720 11700 11500 12400 11410. Waves 2 to
4 feet this afternoon. Waves 2 to 4 feet subsiding to 1 foot or
less tonight. Waves 2 feet or less Sunday morning.

Superior East 14720 11710 11700 11500 11400. Waves 3 to 5 feet
this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 2 feet Sunday morning.

$$

07

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

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