280
FZUS63 KMQT 040742
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
342 AM EDT Thu Jul 4 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...As a weak 29.9 inch high pressure ridge over the Upper
Mississippi Valley settles over the western Great Lakes today, a
29.8 inch low pressure will gradually begin to organize over Iowa
and southern Minnesota. This low will deepen to 29.7 inches as it
tracks east, passing across Wisconsin late tonight and Friday
morning, Lower Michigan on Friday afternoon, then reaching southern
Quebec by Saturday afternoon. In its wake, another weak high
pressure ridge of 29.9 inches will shift east, reaching the western
Great Lakes during Saturday. As the ridge builds to 30.1 inches
while shifting to the Lower Great Lakes on Sunday, a 29.9 inch low
pressure trough will move east to Minnesota. This trough will
dissipate as it moves over Lake Superior on Monday.

LSZ162-041545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
342 AM EDT Thu Jul 4 2024 /242 AM CDT Thu Jul 4 2024/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots veering east late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots late. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-041545-
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-
342 AM EDT Thu Jul 4 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northwest winds less than 10 knots becoming north 5 to
15 knots in the afternoon, then veering east late. Waves calm to
2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A chance of showers and a slight chance of thunderstorms.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-041545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
342 AM EDT Thu Jul 4 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then veering northeast late. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast late. A
slight chance of showers after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-041545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
342 AM EDT Thu Jul 4 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northwest winds 5 to 15 knots veering northeast in the
afternoon, then veering east late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms after midnight. Waves calm to
2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Showers likely and a slight chance of
thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of showers and a slight chance of
thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ266-041545-
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-
342 AM EDT Thu Jul 4 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering north late. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms after midnight. Waves calm to
2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Showers likely and a chance of
thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ267-041545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
342 AM EDT Thu Jul 4 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots. Patchy fog in the
morning. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest after
midnight, then veering north late. A chance of showers after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots backing north late. Showers
likely and a chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-041545-
MAFOR 0409/
Superior West 12700 11100 12200 11100 12110. A chance of showers
overnight. Waves 2 feet or less.

Superior North Central 11610 13700 11800 13200. Waves 2 feet or
less.

Superior South Central 11610 11700 11800 11100 14200. A chance of
showers overnight. Waves 2 feet or less.

Superior East 14700 11700 11800 12700. Waves 2 feet or less.

$$

Rolfson

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

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