910
FZUS63 KMQT 151454
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1054 AM EDT Tue Jul 15 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...

Today through tonight, a 29.7 inch low over the High Plains will
pass a 29.9 inch trough over Lake Superior. As the parent low
weakens to 29.8 inches and moves over Lakes Michigan and Huron
Wednesday, a 30.1 inch high pressure will build over the Northern
Plains. This high will maintain 30.1 inches as it slowly moves over
Lake Superior Thursday, briefly building to 30.2 inches over Lake
Huron Friday before reaching the Lower Great Lakes Saturday at 30.1
inches. Saturday evening, a 29.9 inch trough will move from the
Northern Plains over the lake before a 30.0 inch high is established
over Lake Superior Sunday.


LSZ162-152300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1054 AM EDT Tue Jul 15 2025 /954 AM CDT Tue Jul 15 2025/

.REST OF TODAY...East winds 5 to 15 knots backing north in the
afternoon. Haze by late morning. A chance of showers and
thunderstorms by late morning, then showers and thunderstorms
likely by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming east 10 to
20 knots late. Showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of showers
by mid afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots by mid 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 backing east. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-152300-
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-
1054 AM EDT Tue Jul 15 2025

.REST OF TODAY...East winds 5 to 15 knots backing northwest in
the afternoon, then veering north late. Haze. A chance of showers
and thunderstorms by late morning. Showers and thunderstorms
likely by mid afternoon. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
Showers likely through midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Showers likely through early afternoon. A slight
chance of thunderstorms. A chance of showers by mid afternoon.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest by mid
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 backing south. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-152300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1054 AM EDT Tue Jul 15 2025

.REST OF TODAY...Southeast winds 5 to 15 knots veering west in
the afternoon, then veering north late. Haze. Showers likely and
a chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Haze through midnight. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing north. A chance of
showers. Waves calm to 2 feet.

$$

LSZ265-152300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1054 AM EDT Tue Jul 15 2025

.REST OF TODAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing north late. Haze by late
morning. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. Showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of showers
by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms through midnight,
then showers likely after midnight. Waves subsiding to calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming northwest
5 to 15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-152300-
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-
1054 AM EDT Tue Jul 15 2025

.REST OF TODAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming north 10 to 20 knots
late. Haze by late morning. A chance of showers and
thunderstorms. Waves calm to 2 feet building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TONIGHT...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 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Showers likely and a slight chance of thunderstorms through
early afternoon, then a chance of showers by mid afternoon. Waves
2 to 4 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers through midnight. A
slight chance of thunderstorms. Showers likely after midnight.
Waves 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-152300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1054 AM EDT Tue Jul 15 2025

.REST OF TODAY...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering northeast late.
Showers likely and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots backing north
after midnight. A chance of showers through midnight. A slight
chance of thunderstorms. Showers likely after midnight. Waves
2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves calm to 2 feet.

$$

LSZ261-152300-
MAFOR 1515/
Superior West 11210 11809 11519 11816 11126 13136. Waves 1 to 2
feet this afternoon. Waves 1 to 3 feet building to 2 to 4 feet
tonight. Waves 2 to 4 feet Wednesday morning.

Superior North Central 11416 11606 11809 11816 12820 11130 11120.
Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet building to 2
to 4 feet tonight. Waves 2 to 4 feet Wednesday morning.

Superior South Central 12410 11809 11806 11800 11820 11830 11826.
Waves 1 to 3 feet this afternoon and tonight. Waves 2 to 4 feet
Wednesday morning.

Superior East 11420 11410 11516 11706 11600 11700 11810 11126. A
chance of thunderstorms this afternoon and tonight. Waves 1 to 3
feet.

$$

Thompson

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes