569
FZUS63 KMQT 011402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Fri Aug 1 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...

30.3 inch high pressure centered over the western Great Lakes
maintains its strength through Saturday. Sunday, it weakens to 30.2
inches as it shifts to the Lower Great Lakes and east. This high
continues to slide eastward Monday while another 30.2 inch high
slides across the shores of the Hudson Bay. This high will build to
30.3 inches over Quebec into the middle of next week, extending
surface ridging over Lake Superior.


LSZ162-012000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Fri Aug 1 2025 /902 AM CDT Fri Aug 1 2025/

.REST OF TODAY...Southwest winds 5 to 15 knots. Haze and areas of
smoke. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Haze. Waves subsiding
to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Haze through early afternoon. Areas of
smoke. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-012000-
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 AM EDT Fri Aug 1 2025

.REST OF TODAY...West winds 5 to 15 knots becoming southwest
10 to 20 knots in the afternoon. Haze and areas of smoke. Waves
calm to 2 feet building to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Haze and areas of smoke. Waves subsiding to calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest in the
afternoon, then increasing to 15 to 25 knots late. Haze through
early afternoon. Areas of smoke. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ264-012000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Fri Aug 1 2025

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. Areas of smoke by late morning.
Haze. Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Haze and areas of smoke. Waves subsiding to 1 to
3 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Haze and areas of smoke. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-012000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Fri Aug 1 2025

.REST OF TODAY...West winds 10 to 20 knots. Haze and areas of
smoke. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Haze through midnight.
Areas of smoke. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Haze and areas of smoke. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-012000-
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 AM EDT Fri Aug 1 2025

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon. Haze and areas of smoke. Waves
1 to 3 feet building to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
late. Haze and areas of smoke. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots. Haze and areas of smoke.
Waves 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ267-012000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Fri Aug 1 2025

.REST OF TODAY...Southwest winds 5 to 15 knots becoming west
10 to 20 knots late. Haze. Areas of smoke by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then veering west late. Haze and areas of smoke. Waves
building to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Areas of smoke. Haze by mid afternoon. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ261-012000-
MAFOR 0115/
Superior West 11510 11520 14510 11510 11610. Waves 1 to 3 feet
this afternoon. Waves 2 feet or less tonight and Saturday
morning.

Superior North Central 13520 12620 12610 11620. Waves 2 to 4
feet.

Superior South Central 13620 14610 11610. Waves 2 feet or less.

Superior East 12510 15610. Waves 1 to 3 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