087
FZUS63 KMQT 190802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sat Jul 19 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...

Late tonight into Saturday, a weak 29.9 inch trough sweeps across
Lake Superior before being replaced with a 30.0 inch high by Sunday.
As the high shifts towards the Lower Great Lakes through Tuesday
morning, it builds to 30.1 inches. Low pressure will push out of the
Rockies on Tuesday. As this low moves into James Bay Wednesday, it
will pull a 29.8 inch trough through Lake Superior.


LSZ162-192000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Sat Jul 19 2025 /302 AM CDT Sat Jul 19 2025/

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy fog.
A chance of showers. Waves calm to 2 feet.
.TODAY...North winds 5 to 15 knots backing southwest in the
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering north late. Areas of smoke after midnight.
Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering south in the
afternoon, then veering southwest late. Areas of smoke. Waves
calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots. Areas of smoke through
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming northwest 10 to
20 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing north. A chance of
showers. Waves calm to 2 feet.

$$

LSZ263-192000-
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-
402 AM EDT Sat Jul 19 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy fog.
A chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TODAY...North winds 5 to 15 knots backing southwest late. A
slight chance of showers through early afternoon. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots diminishing to less than
10 knots late. Areas of smoke after midnight. Waves calm to
2 feet.
.SUNDAY...West winds less than 10 knots becoming southwest 5 to
15 knots in the afternoon. Areas of smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Areas of smoke through midnight. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers. A chance of thunderstorms after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ264-192000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Sat Jul 19 2025

.EARLY THIS MORNING...West winds less than 10 knots. Patchy fog.
A chance of showers. Waves calm to 2 feet.
.TODAY...Northeast winds less than 10 knots veering southwest in
the afternoon, then becoming west 5 to 15 knots late. A slight
chance of showers through early afternoon. Patchy fog. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. Areas
of smoke after midnight. Waves calm to 2 feet.
.SUNDAY...West winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then diminishing to less than 10 knots
late. Areas of smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Areas of smoke
through midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-192000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Sat Jul 19 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog. A
chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then becoming northwest 5 to 15 knots
late. Patchy fog through early afternoon. A chance of showers
through early afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. Areas
of smoke after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Areas of smoke through early afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-192000-
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-
402 AM EDT Sat Jul 19 2025

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Patchy fog.
A chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing north in the afternoon,
then backing northwest late. Patchy dense fog. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Patchy fog. Areas of
smoke after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west late. Areas
of smoke through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. A
chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-192000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Sat Jul 19 2025

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing northeast in the
afternoon, then becoming north 10 to 20 knots late. Patchy fog.
Showers likely through early afternoon. A chance of showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Patchy fog. Waves calm
to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon, then veering northwest late. Waves
calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...South winds 10 to 20 knots. Showers likely and a
chance of thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ261-191400-
MAFOR 1909/
Superior West 12100 11800 13500 11600 11700. A chance of showers
this morning. Waves 1 foot or less.

Superior North Central 11400 11800 11700 12600 12610 11710. A
chance of showers early this morning. Waves 2 feet or less.

Superior South Central 12200 11100 11800 14700. A chance of
showers today. Waves 1 foot or less.

Superior East 11300 11200 11100 11800 12700 12710. A chance of
showers today. Waves 2 feet or less.

$$

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