063
FZUS63 KMQT 052002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 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 continues to slowly move across the lake this
evening while a 30.1 inch high pressure builds over the Northern
Plains. As the trough moves out late tonight, expect heights rises
into early Sunday as the high begins to move over the Great Lakes
basin. This then migrates eastward Monday. Tuesday, another high
builds across Hudson Bay which will sustain 30.0 or 30.1 inch
ridging through at least early Thursday.


LSZ162-060800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Jul 5 2025 /301 PM CDT Sat Jul 5 2025/

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

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Patchy
fog. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight. A slight chance of showers through midnight. Patchy
dense fog. Waves 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-
401 PM EDT Sat Jul 5 2025

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

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Patchy dense
fog. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight, then veering north late. A chance of
showers through midnight. Areas of dense fog. Waves 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. 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-
401 PM EDT Sat Jul 5 2025

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

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers through midnight. Areas of dense
fog. Waves 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. 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-
401 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 5 AM
EDT SUNDAY...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Patchy
fog. Showers and a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots late. Patchy dense fog. A slight chance of thunderstorms
through midnight. A chance of showers. Waves 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 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-
401 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 5 AM
EDT SUNDAY...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Patchy fog.
Showers and a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Areas of dense fog. A chance of
thunderstorms through midnight. A chance of showers. Waves
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 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-
401 PM EDT Sat Jul 5 2025

...DENSE FOG ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 5 AM
EDT SUNDAY...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Patchy fog.
Showers and a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then becoming north 15 to 25 knots late. Areas of dense
fog. Showers likely through midnight. A chance of thunderstorms.
A chance of showers after midnight. Waves 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. 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.

$$

LSZ261-060200-
MAFOR 0521/
Superior West 11700 11704 11714 11820 12120 11110 11210. A chance
of showers early this evening. Waves 1 to 2 feet tonight. Waves 2
to 4 feet subsiding to 1 to 3 feet Sunday.

Superior North Central 11106 11800 11824 13830 12820. A chance of
thunderstorms this evening. Waves 1 to 2 feet building to 2 to 4
feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Sunday.

Superior South Central 11216 11716 11710 11724 11830 13820. A
chance of thunderstorms this evening. Waves 1 to 3 feet tonight.
Waves 3 to 5 feet Sunday.

Superior East 11416 11516 19514 11714 11824 13830 11820. A chance
of thunderstorms this evening. Waves 2 to 3 feet tonight. Waves 3
to 5 feet Sunday.

$$

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