388
FZUS63 KMQT 162002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Wed Jul 16 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...

This evening through Thursday morning, a 29.7 inch low over
Wisconsin will move across Lakes Michigan and Huron. By Thursday
afternoon, a 30.1 inch high moves from the Northern Plains to Lake
Superior. This high expands over the Upper Great Lakes by Friday
morning, shifting east to New England by Saturday morning. Another
30.1 inch high slowly builds over the Upper Great Lakes by Sunday
afternoon, remaining over the Great Lakes region through Monday as
it builds to 30.2 inches.


LSZ162-170800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Wed Jul 16 2025 /302 PM CDT Wed Jul 16 2025/

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A chance
of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
A chance of showers through midnight. Waves subsiding to calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
after midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ263-170800-
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 16 2025

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A chance
of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots backing east after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering southwest by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. A chance of
showers. Waves calm to 2 feet.

$$

LSZ264-170800-
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 16 2025

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A chance
of showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-170800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Wed Jul 16 2025

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Patchy
fog. Showers likely. Waves 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Patchy fog. A chance of showers through
midnight. Showers likely after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-170800-
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 16 2025

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A chance
of showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots backing north after
midnight. Patchy fog through midnight. A chance of showers and a
slight chance of thunderstorms through midnight, then showers
likely after midnight. Waves building to 3 to 6 feet occasionally
to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming northwest 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
late. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ267-170800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Wed Jul 16 2025

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A chance
of showers and a slight chance of thunderstorms. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots backing north late. A
chance of showers through midnight. A slight chance of
thunderstorms. Showers likely after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing northwest late. A slight
chance of showers through early afternoon. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southwest late. Waves
subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ261-170200-
MAFOR 1621/
Superior West 11130 11120 13810 11800 11600 11500. A chance of
showers this evening. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 2 feet Thursday.

Superior North Central 11120 12110 13810 11600 11610. A chance of
showers early this evening. A chance of showers overnight. Waves
2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
Thursday.

Superior South Central 13120 11826 12820 11810 11710. Waves 2 to
4 feet building to 3 to 5 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Thursday.

Superior East 14130 11836 11830 11820 11710. Waves 3 to 5 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Thursday.

$$

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