573
FZUS63 KMQT 050801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 29.4 inch low pressure currently moving through Hudson Bay sends a
29.8 inch trough over the lake tonight through early Sunday morning.
Meanwhile Sunday morning, with 30.1 inch high pressure builds over
the Plains. This high moves over the Great Lakes basin late Sunday,
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.


LSZ162-052000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sat Jul 5 2025 /301 AM CDT Sat Jul 5 2025/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots becoming west 10 to 20 knots
in the afternoon, then veering northwest late. Showers likely
through early afternoon. A chance of thunderstorms. A chance of
showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
A slight chance of showers through midnight. Waves calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east in the
afternoon, then becoming northeast 5 to 15 knots late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. 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...East winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.

$$

LSZ263-052000-
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 AM EDT Sat Jul 5 2025

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots veering north late.
Showers likely and a 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. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ264-052000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sat Jul 5 2025

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing north late. Showers and a chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots. A slight chance of thunderstorms through midnight. A
chance of showers. Waves building to 2 to 4 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 becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ265-052000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sat Jul 5 2025

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then veering southwest late. A chance of showers
through early afternoon. A chance of thunderstorms. Showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots late. 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 subsiding to 1 to 3 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. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ266-052000-
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 AM EDT Sat Jul 5 2025

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 10 to 20 knots. A slight chance of showers
through early afternoon. A chance of thunderstorms. Showers
likely by mid afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. 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 becoming northwest 10 to
20 knots late. A slight chance of showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots. 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...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ267-052000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sat Jul 5 2025

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...South winds 10 to 20 knots. Showers likely and a chance
of thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then veering north late. Showers 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 backing northwest late. A
slight chance of showers through early afternoon. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 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...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-051400-
MAFOR 0509/
Superior West 11510 12516 11606 13700 11820. A chance of
thunderstorms today and this evening. Waves 2 feet or less.

Superior North Central 12510 11516 11406 11106 12810 11830. A
chance of thunderstorms today and this evening. Waves 1 to 3
feet.

Superior South Central 11510 12410 11416 11216 11716 11710 11720.
A chance of thunderstorms this afternoon and evening. Waves 1 to
3 feet.

Superior East 13420 11410 11416 11516 11710 11820. A chance of
thunderstorms this afternoon and evening. Waves 2 to 4 feet.

$$

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