738
FZUS63 KMQT 302003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Wed Jul 30 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 ridge eventually reaches Lake Superior by Thursday, then
maintains its strength over the western Great Lakes through Saturday
before weakening to 30.2 inches and moving toward the Eastern
Seaboard on Sunday. Another 30.2 inch high diving over northern
Ontario and James Bay helps to keep 30.1 inch ridging over Lake
Superior on Monday.


LSZ162-310800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Wed Jul 30 2025 /302 PM CDT Wed Jul 30 2025/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast late. Areas
of smoke. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering south in the
afternoon. Areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Areas of smoke. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ263-310800-
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 PM EDT Wed Jul 30 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Areas of smoke.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming north less than
10 knots late. Areas of smoke. Waves calm to 2 feet.
.THURSDAY...Northeast winds less than 10 knots veering south in
the afternoon, then increasing to 5 to 15 knots late. Haze
through early afternoon. Areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Areas of smoke.
Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 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. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ264-310800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Wed Jul 30 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then diminishing to less than 10 knots late. Areas of
smoke. Haze after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds less than 10 knots veering south in
the afternoon, then becoming southwest 5 to 15 knots late. Haze
and areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Haze through
midnight. Areas of smoke. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-310800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Wed Jul 30 2025

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots. Areas of smoke. Waves calm
to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east late. Haze and
areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
late. Areas of smoke. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. 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 5 to 15 knots backing southwest. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-310800-
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 PM EDT Wed Jul 30 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 5 to
15 knots late. Areas of smoke. Haze after midnight. Waves calm to
2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north in the
afternoon. Haze and areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Haze and areas of smoke. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. 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 5 to 15 knots backing south. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-310800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Wed Jul 30 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Areas of
smoke. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering northeast late.
Areas of smoke. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then becoming northwest 10 to 20 knots late. Haze and
areas of smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Haze. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ261-310200-
MAFOR 3021/
Superior West 11300 12200 13100 11200 11400. Waves 1 foot or
less.

Superior North Central 12700 12810 12100 11200 11400. Waves 1
foot or less.

Superior South Central 11810 11800 12810 12800 12100. Waves 1
foot or less.

Superior East 12710 11810 14100 11800. 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