116
FZUS63 KMQT 041347
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 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.



LSZ162-042200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EDT Thu Jul 4 2024 /847 AM CDT Thu Jul 4 2024/

.REST OF 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.

$$

LSZ263-042200-
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-
947 AM EDT Thu Jul 4 2024

.REST OF TODAY...North winds less than 10 knots increasing to
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.

$$

LSZ264-042200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EDT Thu Jul 4 2024

.REST OF TODAY...Northwest winds less than 10 knots 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.

$$

LSZ265-042200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EDT Thu Jul 4 2024

.REST OF 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.

$$

LSZ266-042200-
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-
947 AM EDT Thu Jul 4 2024

.REST OF 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.

$$

LSZ267-042200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EDT Thu Jul 4 2024

.REST OF TODAY...Northwest winds 5 to 15 knots. 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.

$$
LSZ261-042200-
MAFOR 0415/
Superior West 11100 12200 11100 12110 12120. A chance of showers
overnight and Friday morning. Waves 2 feet or less this afternoon
and tonight. Waves 2 to 3 feet Friday morning.

Superior North Central 12700 11800 13200 11100 11110. A chance of
showers Friday morning. Waves 2 feet or less.

Superior South Central 11800 11100 14200 11100 11106. Waves 1
foot or less.

Superior East 13700 11800 12700 11100 11200. A chance of showers
Friday morning. Waves 2 feet or less.

$$

LC

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

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