864
FZUS63 KMQT 302001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Tue Jun 30 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...

A 29.2 inch low will remain stalled near Lake Winnipeg tonight and
gradually weaken to 29.5 inches by Wednesday morning. It will then
weaken further with a broad 29.6 inch low over Ontario and Quebec by
late Wednesday afternoon. The low will push toward the Hudson Bay
and Quebec Wednesday night into Thursday dragging a 29.7 inch trough
over Lake Superior. Thereafter a 30.0 inch high will build over
Ontario, extending south into the Upper Great Lakes through the
weekend.



LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Tue Jun 30 2026 /301 PM CDT Tue Jun 30 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/
WEDNESDAY...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms through midnight.
Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming north less than
10 knots. Waves calm to 2 feet.

$$

LSZ263-010800-
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 Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT WEDNESDAY...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Patchy
dense fog. A slight chance of showers and thunderstorms. Waves
calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy dense fog through midnight. Waves 1 to
3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and a slight
chance of thunderstorms through midnight. Waves subsiding to calm
to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT WEDNESDAY...

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Areas of dense
fog. A slight chance of showers and thunderstorms. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. Patchy fog. Waves 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing south late. Waves
building to 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY NIGHT...Northwest winds less than 10 knots veering north
after midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT WEDNESDAY...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Patchy dense
fog. A chance of showers and thunderstorms. Some thunderstorms
may be severe. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A slight chance of showers and thunderstorms through
midnight. Patchy fog. Some thunderstorms may be severe. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-010800-
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 Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT WEDNESDAY...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Patchy dense
fog. A chance of showers and thunderstorms. Some thunderstorms
may be severe. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A slight chance of showers and thunderstorms through midnight.
Patchy fog. Some thunderstorms may be severe. Waves building to
1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Patchy dense fog through early afternoon. A slight
chance of showers and thunderstorms by mid afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and a slight chance of
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT WEDNESDAY...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Patchy dense
fog. A chance of showers and thunderstorms. Some thunderstorms
may be severe. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then diminishing to 5 to 15 knots late. Patchy fog
through midnight. Areas of dense fog after midnight. A chance of
thunderstorms through midnight. A chance of showers. A slight
chance of thunderstorms after midnight. Some thunderstorms may be
severe through midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing southeast in
the afternoon, then veering south late. Areas of dense fog
through early afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
late. Showers likely through midnight. A chance of thunderstorms.
A chance of showers after midnight. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ261-010200-
MAFOR 3021/
Superior West 11520 19524 13520 14510. Waves 2 feet or less.

Superior North Central 11414 11420 15520. Waves 1 to 3 feet.

Superior South Central 11420 19424 11420 13520 11510 12410. A
chance of showers and thunderstorms this evening. Waves 1 to 3
feet tonight. Waves 2 feet or less Wednesday.

Superior East 11416 19414 12420 11520 11514 11504 12400. A chance
of thunderstorms this evening. Waves 1 to 3 feet.

$$

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