521
FZUS63 KMQT 020803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Wed Jul 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...

29.9 inch ridging moves in today before building to 30.0 inches
tonight; the 30.0 inch ridging remains across the Upper Great Lakes
into Friday. Afterwards, low pressure emerging from the northern
Rockies into central Canada brings a 29.7 inch trough through Lake
Superior Saturday into Sunday. High pressure builds into the Upper
Great Lakes early next week.


LSZ162-022000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Wed Jul 2 2025 /302 AM CDT Wed Jul 2 2025/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots backing southwest in the
afternoon. Scattered showers and isolated thunderstorms. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. A slight chance
of showers and thunderstorms after midnight. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely and a chance of thunderstorms.
Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering northwest.
Showers. A chance of thunderstorms. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. A chance of showers. 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-
402 AM EDT Wed Jul 2 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Isolated showers. Isolated thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves building to
1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots. 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-
402 AM EDT Wed Jul 2 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming north less than
10 knots after midnight, then veering northeast late. Waves calm
to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast late.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Showers likely. A chance of showers. Waves subsiding to
calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-022000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Wed Jul 2 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. Isolated showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...South winds 15 to 25 knots becoming northwest 10 to
20 knots. Showers likely and a chance of thunderstorms. Waves
calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. 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-
402 AM EDT Wed Jul 2 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east late. Waves
calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering northwest. Showers
likely and a chance of thunderstorms. Waves subsiding to calm to
2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

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

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Waves
calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots. Showers likely and a
chance of thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ261-021400-
MAFOR 0209/
Superior West 12610 11510 11510 19516 11510 11610 11700 11100.
Waves 2 feet or less.

Superior North Central 13610 11510 12610 11700 11800. Waves 1 to
3 feet.

Superior South Central 14610 11510 11400 12800. Waves 2 feet or
less.

Superior East 11610 11600 12610 12600 11700 11800. Waves 1 to 2
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