640
FZUS63 KMQT 022002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM 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...

A weak ridge of 30.0 inches builds in across the upper Great Lakes
tonight and remains across the area through 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 of 30.2 inches builds into the Upper Great
Lakes early next week.


LSZ162-030800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Wed Jul 2 2025 /301 PM CDT Wed Jul 2 2025/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northeast after
midnight. Haze after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Haze through early afternoon. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A slight chance of showers and thunderstorms.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers through midnight. A chance of thunderstorms. Showers
likely after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Showers and a chance
of thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ263-030800-
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-
401 PM EDT Wed Jul 2 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northeast after
midnight, then diminishing to less than 10 knots late. Haze after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Haze through early afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Showers and a chance
of thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ264-030800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Wed Jul 2 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming north less than
10 knots after midnight, then veering northeast late. Haze. Waves
calm to 2 feet.
.THURSDAY...Northeast 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. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves 1 to
3 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of showers
through early afternoon. A chance of thunderstorms. Showers
likely by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ265-030800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Wed Jul 2 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing north after
midnight. Haze. 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 late. 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 becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. A chance of showers through early afternoon. A chance
of thunderstorms. Showers likely by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering north
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots becoming south 5 to 15 knots.
Waves calm to 2 feet.

$$

LSZ266-030800-
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-
401 PM EDT Wed Jul 2 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Haze. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight.
Haze. 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 increasing to
10 to 20 knots late. 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
and thunderstorms. Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers
through early afternoon. A chance of thunderstorms. Showers
likely by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Showers likely and a chance of thunderstorms. Waves
calm to 2 feet.
.SUNDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-030800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Wed Jul 2 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Haze.
Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing southeast
after midnight. 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. A chance of showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves calm
to 2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-030200-
MAFOR 0221/
Superior West 11510 11610 11700 14100 11100. Waves 2 feet or
less.

Superior North Central 12610 12800 12100 11200 11300. Waves 2
feet or less.

Superior South Central 11510 11400 13800 12100 11210. Waves 1
foot or less.

Superior East 12600 11700 13800 12700. 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