089
FZUS63 KMQT 160202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM 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...

A 29.9 inch trough moving over the lake tonight stalls out over
eastern Lake Superior and northern Lake Michigan on Wednesday as a
29.7 inch low tracks from the plains, through central WI and into
northern Lower Michigan by Thursday morning. A 30.1 inch high
pressure will build over the Northern Plains on Wednesday and move
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.


LSZ162-160800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue Jul 15 2025 /901 PM CDT Tue Jul 15 2025/

.REST OF TONIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots late. Patchy fog by midnight. A chance of showers
and a slight chance of thunderstorms. Waves calm to 2 feet
building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight, then increasing to 10 to 20 knots late. 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 by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-160800-
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-
1001 PM EDT Tue Jul 15 2025

.REST OF 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 by midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves calm to 2 feet building
to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers and a slight chance of
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet, then 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. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ264-160800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Tue Jul 15 2025

.REST OF TONIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Patchy fog. Showers likely by midnight.
A slight chance of thunderstorms. A chance of showers after
midnight. Waves calm to 2 feet building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west 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. 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 backing north. Waves
calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ265-160800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue Jul 15 2025

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

$$

LSZ266-160800-
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-
1001 PM EDT Tue Jul 15 2025

.REST OF TONIGHT...North winds 10 to 20 knots. Patchy fog.
Showers likely by midnight. A slight chance of thunderstorms. A
chance of showers after midnight. Waves calm to 2 feet building
to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Patchy fog through early afternoon. A
chance of showers and a slight chance of thunderstorms. 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 southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-160800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue Jul 15 2025

.REST OF TONIGHT...West winds 5 to 15 knots veering north late.
Patchy fog. A chance of showers and thunderstorms. Waves calm to
2 feet.
.WEDNESDAY...North winds 10 to 20 knots. Patchy fog through early
afternoon. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet.
.WEDNESDAY NIGHT...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 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 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northwest. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-160800-
MAFOR 1603/
Superior West 11126 14130 11130 11120 11110. Waves 1 to 3 feet
building to 2 to 4 feet overnight. Waves 2 to 4 feet Wednesday.
Waves 2 to 4 feet subsiding to 1 to 3 feet Wednesday evening.

Superior North Central 11826 12820 13120 12110. Waves 1 to 3 feet
overnight. Waves 2 to 4 feet Wednesday. Waves 1 to 3 feet
Wednesday evening.

Superior South Central 11806 14820 11826 11816 11810. Waves 1 to
2 feet overnight. Waves 2 to 4 feet Wednesday and Wednesday
evening.

Superior East 11606 11700 11810 14120 11120. A chance of
thunderstorms overnight. Waves 1 to 2 feet overnight. Waves 1 to
3 feet building to 2 to 4 feet Wednesday. Waves 2 to 4 feet
Wednesday evening.

$$

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