264
FZUS63 KMQT 060203
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Sat Jul 5 2025

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 29.8 inch trough currently over eastern Lake Superior will
continue to drift east, reaching the Lower Great Lakes Sunday
evening. Meanwhile on Sunday, a broad 30.0 inch high will extend
across Lake Superior, northern Ontario, and Manitoba. This high will
maintain strength and only slowly drift east through Tuesday
evening. Tuesday night into Wednesday, a 29.9 inch low will approach
Lake Superior from the southwest, though by Thursday morning, high
pressure of 30.1 inches over Quebec will re-establish 30.0 inch
ridging over the lake. A low pressure moving into Hudson Bay Friday
morning will bring a trough to the western extent of Lake Superior
Friday into next weekend.


LSZ162-060800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Sat Jul 5 2025 /902 PM CDT Sat Jul 5 2025/

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 AM EDT /1 AM CDT/
SUNDAY...

.REST OF TONIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots late. Waves calm to 2 feet building to 1 to
3 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely and
a chance of thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-060800-
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-
1002 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 AM EDT SUNDAY...

.REST OF TONIGHT...North winds less than 10 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet building to
2 to 4 feet.
.SUNDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight, then veering north late. Waves calm
to 2 feet.
.MONDAY...Northeast winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. A chance of showers
through midnight. A slight chance of thunderstorms. Showers
likely 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 becoming north
less than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-060800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 AM EDT SUNDAY...

.REST OF TONIGHT...North winds less than 10 knots increasing to
15 to 25 knots. Areas of dense fog by midnight. Waves calm to
2 feet building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.MONDAY...Northeast winds less than 10 knots veering southeast by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds less than 10 knots increasing to
5 to 15 knots after midnight. A chance of showers. A slight
chance of thunderstorms after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. A chance of showers through
early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming southeast
less than 10 knots. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-060800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 5 AM EDT SUNDAY...

.REST OF TONIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots late. Patchy dense fog by midnight. A chance of showers.
Waves calm to 2 feet building to 2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-060800-
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-
1002 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 5 AM EDT SUNDAY...

.REST OF TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of dense fog. A chance of showers. Waves
calm to 2 feet building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog through early afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then veering northeast late. Waves
subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ267-060800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 5 AM EDT SUNDAY...

.REST OF TONIGHT...South winds 5 to 15 knots backing north after
midnight, then increasing to 15 to 25 knots late. Patchy dense
fog. Showers and a slight chance of thunderstorms by midnight. A
chance of showers after midnight. Waves calm to 2 feet building
to 2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog through early afternoon. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering northeast
late. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing south after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ261-060800-
MAFOR 0603/
Superior West 11800 19804 13120 11110 11210 11200 11800. Waves 1
to 2 feet overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet
Sunday. Waves 1 to 2 feet Sunday evening.

Superior North Central 11804 11820 19824 12830 12820 11710 11700.
Waves 1 to 2 feet building to 2 to 4 feet overnight. Waves 3 to 5
feet subsiding to 2 to 4 feet Sunday. Waves 1 to 3 feet Sunday
evening.

Superior South Central 11800 19804 11824 11830 13820 11810 11710.
A chance of showers overnight. Waves 1 to 3 feet overnight. Waves
3 to 5 feet Sunday. Waves 2 to 4 feet Sunday evening.

Superior East 11806 19804 11820 19824 11830 19834 12830 11820
11720 11710. Waves 2 to 3 feet overnight. Waves 3 to 5 feet
Sunday. Waves 2 to 4 feet Sunday evening.

$$

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