843
FZUS63 KMQT 301401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM 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 29.4 inch low will rotate around Lake Winnipeg, deepening to 29.1
inches this morning.  This low wobbles around southern Manitoba
today, weakening to 29.5 inches as it crosses northern Ontario
tomorrow. Thursday morning, the low will further weaken to 29.6
inches over northern Quebec while 30.0 inch high pressure builds
over the US Southeast and northern Manitoba and broad 29.8 inch low
pressure spreads over the High Plains. Friday into the weekend, the
high over Canada moves into Hudson Bay, building to 30.1 inches.



LSZ162-302000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Tue Jun 30 2026 /901 AM CDT Tue Jun 30 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS
EVENING...

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots late. Patchy fog by late morning. Waves calm to
2 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. A chance of showers
and a slight chance of 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 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...North 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.
.SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-302000-
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 Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. Patchy dense fog. A slight
chance of showers and thunderstorms by mid afternoon. Some
thunderstorms may be severe. Waves 1 to 3 feet subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of showers 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
thunderstorms through midnight. Waves subsiding to calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering northeast
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.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-302000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 5 to 15 knots increasing to 10 to
20 knots late. Areas of dense fog. A slight chance of showers and
thunderstorms by mid afternoon. Waves 2 to 4 feet subsiding to
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. 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 thunderstorms
through midnight. A chance of showers. 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...East winds 5 to 15 knots becoming north less than
10 knots. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ265-302000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 10 to 20 knots backing southeast
late. Patchy fog by late morning. A chance of showers and
thunderstorms by mid afternoon. 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. Some thunderstorms may be severe. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots. A chance of showers and
a slight chance of 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. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing north. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-302000-
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 Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southeast late. Areas of
dense fog by late morning. A chance of showers and thunderstorms.
Some thunderstorms may be severe. Waves 2 to 4 feet subsiding to
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 chance of showers and thunderstorms through midnight. Patchy
fog. Some thunderstorms may be severe. Waves building to 1 to
3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Areas of dense fog through early afternoon. A chance of
showers and a slight chance of thunderstorms by mid afternoon.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely through midnight. A chance of
thunderstorms. A slight 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 building to 1 to
3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-302000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Tue Jun 30 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 10 to 20 knots becoming southeast
5 to 15 knots late. Areas of dense fog by late morning. A chance
of showers and thunderstorms. Some thunderstorms may be severe.
Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then diminishing to 5 to 15 knots late. Patchy dense
fog. 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 south in the
afternoon. Areas of dense fog through early afternoon. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. 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...Southwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...North 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.

$$

LSZ261-302000-
MAFOR 3015/
Superior West 11510 11500 19504 14520 11520 11510. Waves 2 feet
or less.

Superior North Central 12414 11410 11424 14520. Waves 2 to 4 feet
subsiding to 1 to 3 feet this afternoon. Waves 1 to 3 feet
tonight and Wednesday morning.

Superior South Central 11420 19424 12310 12420 11520 12510. A
chance of showers and thunderstorms this afternoon. A chance of
thunderstorms this evening. Waves 1 to 3 feet.

Superior East 11424 11410 11310 11420 11520 11524 11514 11500
19504. A chance of showers and thunderstorms this afternoon and
evening. Waves 2 to 4 feet subsiding to 1 to 3 feet this
afternoon. Waves 1 to 3 feet tonight and Wednesday morning.

$$

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