466
FZUS63 KMQT 121401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sat Jul 12 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 moves across the lake through this afternoon as a
low over northern Ontario deepens to 29.6 inches. This low deepens
further to 29.4 inches tonight as it drifts northeast towards Hudson
Bay while 30.0 inch high pressure builds just south of the Great
Lakes basin. The high maintains strength and position on Sunday
while the low deepens to 29.2 inches over Hudson Bay. On Monday,
weak ridging near 30.0 inches builds over Lake Superior as 29.7 inch
low pressure forms over the High Plains. This low will pass a 29.9
inch trough over Lake Superior Tuesday before 30.1 inch high
pressure builds in its wake over northern Ontario Wednesday into
Thursday.


LSZ162-122000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sat Jul 12 2025 /901 AM CDT Sat Jul 12 2025/

.REST OF TODAY...West winds 5 to 15 knots backing southwest in
the afternoon, then becoming west 10 to 20 knots late. Haze.
Areas of smoke by mid afternoon. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest late.
Areas of smoke through midnight. Haze. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves subsiding to calm to
2 feet.
.MONDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Showers likely and a
chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-122000-
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-
1001 AM EDT Sat Jul 12 2025

.REST OF TODAY...West winds 5 to 15 knots backing southwest late.
A chance of showers and thunderstorms. Haze by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Areas of smoke through
midnight. Haze. Waves building to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to 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. Showers likely. A
chance of thunderstorms. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-122000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sat Jul 12 2025

.REST OF TODAY...South winds less than 10 knots becoming west
5 to 15 knots in the afternoon, then backing southwest late. A
chance of showers and thunderstorms. Haze by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers and thunderstorms
through midnight. Areas of smoke through midnight. Haze. Waves
building to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. A chance of showers after midnight. Waves calm to
2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing northeast.
Showers likely. A chance of thunderstorms. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing north. A
chance of showers. Waves calm to 2 feet.

$$

LSZ265-122000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sat Jul 12 2025

.REST OF TODAY...South winds 5 to 15 knots veering west late. A
chance of showers and thunderstorms. Haze by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Haze and areas of smoke. Waves building to 1 to
3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. A slight chance of showers through
midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing north. A chance
of showers. A chance of thunderstorms. Showers likely. Waves calm
to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ266-122000-
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-
1001 AM EDT Sat Jul 12 2025

.REST OF TODAY...Southeast winds 5 to 15 knots backing north in
the afternoon, then backing west late. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Haze and areas of smoke. Waves
building to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A slight chance of showers and thunderstorms.
Waves 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing north. A chance
of showers. Showers likely. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ267-122000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sat Jul 12 2025

.REST OF TODAY...East winds 10 to 20 knots veering west late.
Showers by late morning. A slight chance of thunderstorms. A
chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then veering west late. A chance of
showers and a slight chance of thunderstorms through midnight.
Haze and areas of smoke after midnight. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A slight chance of showers. A slight chance of
thunderstorms after midnight. Waves building to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering southwest. A
chance of showers. A chance of thunderstorms. Showers likely.
Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering northeast. A
chance of showers. Waves calm to 2 feet.

$$

LSZ261-122000-
MAFOR 1215/
Superior West 11600 12510 11620 12610 12520. A chance of showers
and thunderstorms this afternoon. Waves 2 feet or less this
afternoon. Waves 2 to 3 feet tonight and Sunday morning.

Superior North Central 11500 13610 14620. A chance of showers
late this morning, then a chance of showers and thunderstorms
this afternoon. A chance of showers and thunderstorms this
evening. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday
morning.

Superior South Central 11300 11700 11600 11610 14620. A chance of
showers this afternoon. Waves 1 foot or less this afternoon.
Waves 1 to 3 feet tonight and Sunday morning.

Superior East 11116 11710 12610 11510 11520 11620 11510. 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