601
FZUS63 KMQT 021402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sat Aug 2 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 remains centered over the western Great
Lakes today, weakening to 30.2 inches this evening before shifting
to the Lower Great Lakes and east Sunday. By midday Monday, that
high will be replaced by a high building to 30.3 inches over James
Bay. Tuesday, this high builds to 30.4 inches over Quebec while 29.8
inch troughing is over the High Plains. Wednesday, the high further
builds to 30.5 inches with both features remaining largely
stationary. Thursday, a low of 29.7 inches emerges over Manitoba
while the high weakens to 30.3 inches off the New England coast.


LSZ162-022000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Sat Aug 2 2025 /902 AM CDT Sat Aug 2 2025/

.REST OF TODAY...Southwest winds 10 to 20 knots. Haze. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Haze. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Haze. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers and thunderstorms. Waves calm to
2 feet.

$$

LSZ263-022000-
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 Sat Aug 2 2025

.REST OF TODAY...West winds 10 to 20 knots becoming southwest
15 to 25 knots in the afternoon. Areas of smoke by late morning.
Haze. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. Haze. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Haze. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of showers. Waves calm to 2 feet.

$$

LSZ264-022000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Sat Aug 2 2025

.REST OF TODAY...West winds 10 to 20 knots backing southwest in
the afternoon, then increasing to 15 to 25 knots late. Areas of
smoke by late morning, then haze by mid afternoon. Waves calm to
2 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. Haze. Waves
subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Haze. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south less
than 10 knots 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...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-022000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Sat Aug 2 2025

.REST OF TODAY...West winds 10 to 20 knots. Areas of smoke. Haze
by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then becoming west 10 to 20 knots late. Haze. Waves
calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Haze. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering 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...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.

$$

LSZ266-022000-
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 Sat Aug 2 2025

.REST OF TODAY...West winds 10 to 20 knots. Areas of smoke. Haze
by mid afternoon. Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late.
Haze. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Haze. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-022000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Sat Aug 2 2025

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Areas of smoke. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Areas of smoke through
midnight. Haze. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Haze. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots. 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 becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ261-022000-
MAFOR 0215/
Superior West 14520 14510. Waves 2 feet or less.

Superior North Central 11620 13530 14620. Waves 2 to 4 feet.

Superior South Central 11620 13610 12510 12610. Waves 2 feet or
less.

Superior East 13610 13510 12610. 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