876
FZUS63 KMQT 291401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sat Aug 29 2026

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...

30.0 inch ridging over Lake Superior today breaks down by this
afternoon as the parent high moves offshore. A 29.6 inch low
develops over the Central and Northern Plains tonight before lifting
north into the Canadian Prairies early next week. The new 29.4 inch
low over the Canadian Prairies on Monday is projected to bring 29.8
inch troughing over Lake Superior by late Monday. Weak high pressure
ridging of 29.9 inches looks to make a quick return on Tuesday
before being replaced by weak 29.8 inch troughing Tuesday night and
Wednesday morning.



LSZ162-292000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sat Aug 29 2026 /901 AM CDT Sat Aug 29 2026/

.REST OF TODAY...East winds 5 to 15 knots. A slight chance of
thunderstorms by late morning. A chance of showers. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight. A slight chance of showers through midnight. Patchy fog
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. Patchy fog. A slight chance of showers. Waves building
to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. A slight chance of showers through midnight, then
showers likely and a slight chance of thunderstorms after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms through early afternoon. Waves subsiding
to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing northeast.
Waves calm to 2 feet.

$$

LSZ263-292000-
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 AM EDT Sat Aug 29 2026

.REST OF TODAY...South winds 5 to 15 knots. A slight chance of
thunderstorms by late morning. A chance of showers. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then backing east late. A slight chance of showers
through midnight. Patchy fog. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon. Patchy fog. A slight chance of showers
by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers through
midnight, then showers likely and a slight chance of
thunderstorms after midnight. Waves 1 to 3 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Showers likely through early afternoon. A slight
chance of thunderstorms. A slight chance of showers by mid
afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering north. Waves calm
to 2 feet.

$$

LSZ264-292000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sat Aug 29 2026

.REST OF TODAY...Southeast winds 5 to 15 knots veering south
late. A slight chance of showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...South winds less than 10 knots backing southeast late.
Patchy fog. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves building to
1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Showers likely through
early afternoon. A slight chance of thunderstorms. A chance of
showers by mid afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-292000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sat Aug 29 2026

.REST OF TODAY...South winds 5 to 15 knots becoming southeast
10 to 20 knots in the afternoon. A chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southeast late. A slight
chance of showers through midnight. Patchy fog after midnight.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Showers likely through
early afternoon. A slight chance of thunderstorms. A chance of
showers by mid afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-292000-
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 AM EDT Sat Aug 29 2026

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. Patchy fog. A chance of showers and a slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. A slight chance of showers
and thunderstorms through midnight. Patchy fog after midnight.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots. A slight chance of
showers. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Showers likely and a
slight chance of thunderstorms. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ267-292000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sat Aug 29 2026

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. Patchy fog. A slight chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. A chance
of showers and a slight chance of thunderstorms through midnight.
Patchy fog after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Patchy fog through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots. A chance of showers
through early afternoon, then showers likely and a slight chance
of thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ261-292000-
MAFOR 2915/
Superior West 11400 14300 11200 11210 11110. A chance of showers
this afternoon. Waves 1 foot or less.

Superior North Central 13300 13400 11300 11200. Waves 1 foot or
less.

Superior South Central 11300 12310 11420 12410 11300 11210. A
chance of showers and thunderstorms this afternoon and evening.
Waves 2 feet or less.

Superior East 11400 12300 11400 11410 12400 11300. A chance of
showers this evening. 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