433
FZUS63 KMQT 300751
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
351 AM EDT Sun Jun 30 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 29.7 inch low pressure trough extending from
southern Quebec across the Great Lakes region will continue to
move southeast. Meanwhile, a 30.2 inch high pressure over North
Dakota will build to 30.3 inches as it moves southeast, settling
over the western Great Lakes region today and tonight. As the
high weakens to 30.2 inches while moving to the Lower Great Lakes
by Monday evening, a 29.6 inch low will develop over the Northern
Plains. This low will deepen to 29.4 inches while lifting into
northern Ontario by Tuesday evening. An associated 29.7 inch
trough will sweep across Lake Superior Tuesday night and Wednesday
morning. In its wake, a 29.9 inch high pressure ridge will shift
east, reaching the western Great Lakes on Thursday. A 29.7 inch
low pressure organizing over the Plains on Thursday will then
track to the western Great Lakes region on Friday.


LSZ162-301600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
351 AM EDT Sun Jun 30 2024 /251 AM CDT Sun Jun 30 2024/

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers through
midnight. A slight chance of thunderstorms. Showers after
midnight. Waves building to 2 to 4 feet.
.TUESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming northeast
10 to 20 knots. A chance of showers and thunderstorms. Waves calm
to 2 feet.

$$

LSZ263-301600-
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-
351 AM EDT Sun Jun 30 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers through midnight, then showers and a slight chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.TUESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers likely through early
afternoon. Waves 2 to 4 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing east. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-301600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
351 AM EDT Sun Jun 30 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Southeast winds 15 to 25 knots veering south by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves building to 4 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ265-301600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
351 AM EDT Sun Jun 30 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. A chance of showers after midnight. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Southeast winds 20 to 30 knots becoming south 15 to
25 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-301600-
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-
351 AM EDT Sun Jun 30 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TODAY...Northwest winds 10 to 20 knots backing west late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves building to 1 to 3 feet.
.MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers through early afternoon, then
a chance of showers by mid afternoon. Waves building to 4 to
8 feet occasionally to 10 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers likely. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ267-301600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
351 AM EDT Sun Jun 30 2024

.EARLY THIS MORNING...North winds 15 to 25 knots. A slight chance
of showers. Waves 4 to 7 feet occasionally to 9 feet subsiding to
3 to 6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers after midnight. Waves
building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots. Showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots becoming east 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-301600-
MAFOR 3009/
Superior West 12700 11600 11510 14500. Waves 1 foot or less.

Superior North Central 12700 11600 11610 12620 12610. Waves 1 to
3 feet.

Superior South Central 11720 12710 11700 14600. Waves 3 to 5 feet
subsiding to 1 to 3 feet today. Waves 1 foot or less tonight.

Superior East 11820 12720 11710 12610 12710. Waves 3 to 6 feet
subsiding to 2 to 4 feet today. Waves 1 to 3 feet tonight.

$$

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