242
FZUS63 KMQT 010134
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
934 PM 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 sprawling 30.3 inch high pressure is currently
over the western Great Lakes region. 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.

LSZ162-010945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
934 PM EDT Sun Jun 30 2024 /834 PM CDT Sun Jun 30 2024/

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then backing south late. 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...East winds 10 to 20 knots veering southeast after
midnight, then increasing to 15 to 25 knots late. A chance of
showers through midnight. A slight chance of thunderstorms.
Showers after midnight. Waves building to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south by mid
afternoon. Showers likely and a slight chance of thunderstorms
through early afternoon, then a chance of showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming northeast
10 to 20 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing northwest. A
chance of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ263-010945-
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-
934 PM EDT Sun Jun 30 2024

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southwest late. Waves 1 to
3 feet subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. 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. Showers and a slight
chance of thunderstorms through early afternoon, then a chance of
showers by mid 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. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing east. A chance
of showers. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ264-010945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
934 PM EDT Sun Jun 30 2024

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southwest late. Waves 1 to
3 feet 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...South winds 15 to 25 knots. Showers through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-010945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
934 PM EDT Sun Jun 30 2024

.REST OF 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 10 to 20 knots becoming south
15 to 25 knots late. A chance of showers after midnight. Waves
building to 2 to 4 feet.
.TUESDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Showers through early afternoon, then
a chance of showers and a slight chance of thunderstorms by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast. A chance
of showers. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming north 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ266-010945-
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-
934 PM EDT Sun Jun 30 2024

.REST OF TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet
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...Southeast winds 10 to 20 knots veering south
after midnight, then increasing to 15 to 25 knots late. A chance
of showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...South winds 20 to 30 knots. Showers. A slight chance
of thunderstorms by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers likely through midnight. A
chance of showers after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming north 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ267-010945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
934 PM EDT Sun Jun 30 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then backing southeast late. Waves
building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers. 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 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing east. Waves calm to
2 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast. A chance
of showers and thunderstorms. Waves calm to 2 feet.

$$
LSZ261-010945-
MAFOR 0103/
Superior West 12500 12400 11300 12210 11310. Waves 2 feet or
less.

Superior North Central 11620 12610 12500 12310 11320. Waves 1 to
4 feet.

Superior South Central 11610 12600 11500 11300 11310 12320.
Waves 2 feet or less overnight and Monday building to 2 to 4 feet
Monday evening.


Superior East 12710 11600 12500 11400 12310. Waves 1 to 3 feet.

$$

BW

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

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