360
FZUS63 KMQT 120837
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
437 AM EDT Sun May 12 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 29.4 inch low over far northwestern Ontario this
morning is beginning to bring 29.6 inch troughing over the western
lake. As the low weakens slightly throughout the rest of today,
the troughing over the lake strengthens to 29.5 inches as it
spreads across the rest of Lake Superior. As the low continues
east tonight, expect it and its associated troughing over Lake
Superior to weaken, with the low arriving at James Bay Monday
morning. From Monday into Wednesday, high pressure slowly builds
in over northern Ontario, with ridging becoming maximized over
Lake Superior at 30.1 inches by Wednesday morning. By Thursday, a
29.8 inch low moving through the Northern PLains approaches the
Upper Great Lakes.

LSZ162-121645-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
437 AM EDT Sun May 12 2024 /337 AM CDT Sun May 12 2024/

.EARLY THIS MORNING...South winds 10 to 20 knots. Sprinkles.
Waves 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering west late. Sprinkles
through early afternoon. Haze by mid afternoon. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering north late. Haze. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering south in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ263-121645-
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-
437 AM EDT Sun May 12 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Sprinkles.
Waves 2 to 4 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Sprinkles through early afternoon.
Haze by mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming north 10 to
20 knots late. Haze through midnight. Waves subsiding to calm to
2 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then veering south late. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.WEDNESDAY...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.
.THURSDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ264-121645-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
437 AM EDT Sun May 12 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Sprinkles.
Waves 1 to 3 feet building to 2 to 4 feet.
.TODAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. Sprinkles through early afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then increasing to 10 to 20 knots late. Haze through midnight.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southeast. A chance
of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.

$$

LSZ265-121645-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
437 AM EDT Sun May 12 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Sprinkles.
Waves calm to 2 feet building to 1 to 3 feet.
.TODAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots late. Sprinkles through early afternoon. A slight chance
of showers and thunderstorms by mid afternoon. Waves building to
2 to 4 feet, then subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. Haze through midnight. Waves calm to
2 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ266-121645-
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-
437 AM EDT Sun May 12 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Sprinkles.
Waves calm to 2 feet building to 2 to 4 feet.
.TODAY...South winds 15 to 25 knots diminishing to 5 to 15 knots
late. Sprinkles. A slight chance of thunderstorms by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then backing northwest late. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Waves 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming southeast
10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

$$

LSZ267-121645-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
437 AM EDT Sun May 12 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Sprinkles. Waves
calm to 2 feet.
.TODAY...South winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then diminishing to 10 to 20 knots late.
Sprinkles. A slight chance of thunderstorms by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then veering northwest late. Waves subsiding to calm to
2 feet.
.MONDAY...Northwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.

$$
LSZ261-121645-
MAFOR 1209 AMD/
Superior West 11420 11510 13610 11710 11720 11710. Waves 2 to 4
feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

Superior North Central 11420 11430 11520 12510 11610 11810 11720.
Waves 2 to 4 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet today. Waves 2 to 4 feet tonight.

Superior South Central 11420 12430 11410 11400 11500 11620 11710.
Waves 1 to 2 feet building to 3 to 5 feet, then subsiding to 2 to
4 feet today. Waves 1 to 2 feet tonight.

Superior East 11410 12430 11420 12410 11510 11710. Waves 1 to 3
feet building to 3 to 6 feet today. Waves 2 to 4 feet subsiding
to 1 to 2 feet tonight.

$$

TAP

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

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