872
FZUS63 KMQT 151401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Wed Jul 15 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...

30.1 inch ridging persists over Lake Superior through Friday while
gradually shifting east towards the St. Lawrence Seaway. Low
pressure passing through the Northern Plains looks to traverse the
Great Lakes at around 29.7 inches Friday night into Saturday,
although uncertainty remains high on track and strength.
Nevertheless, weak 29.9 to 30.0 inch ridging does look to return to
Lake Superior on Sunday.



LSZ162-152000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed Jul 15 2026 /901 AM CDT Wed Jul 15 2026/

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT /7 AM CDT/
THURSDAY...

.REST OF TODAY...Northwest winds 5 to 15 knots veering north in
the afternoon. Smoke. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late.
Smoke. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon. Smoke. A slight chance of showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and a slight
chance of thunderstorms after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
through midnight. A chance of thunderstorms. Waves calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots becoming west 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ263-152000-
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 Wed Jul 15 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY...

.REST OF TODAY...Northwest winds 5 to 15 knots backing west in
the afternoon. Smoke. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Smoke. Waves calm to 2 feet.
.THURSDAY...Northwest winds less than 10 knots becoming northeast
5 to 15 knots in the afternoon. Smoke. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. A chance of showers
and a slight chance of thunderstorms after midnight. Waves calm
to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Showers likely. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ264-152000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Wed Jul 15 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY...

.REST OF TODAY...Northwest winds 5 to 15 knots backing west in
the afternoon. Smoke. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Smoke. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming northeast less
than 10 knots in the afternoon, then becoming southwest 5 to
15 knots late. Smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southeast
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots. Showers likely. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ265-152000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Wed Jul 15 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY...

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing west late. Smoke.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Smoke. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. Smoke. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Showers likely. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ266-152000-
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 Wed Jul 15 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY...

.REST OF TODAY...Northwest winds 10 to 20 knots becoming west
5 to 15 knots late. Smoke. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...West winds 5 to 15 knots. Smoke. Waves subsiding to
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then backing northwest late. Smoke. Waves calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing southeast
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ267-152000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Wed Jul 15 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT THURSDAY...

.REST OF TODAY...West winds 10 to 20 knots. Smoke. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Smoke. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then increasing to 10 to 20 knots late. Smoke. Waves
calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots. Showers likely
and a chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves building to 1 to 3 feet.

$$

LSZ261-152000-
MAFOR 1515/
Superior West 11700 11600 11500 13600 12700. Waves 1 foot or
less.

Superior North Central 11700 11600 14610 11610 11700. Waves 1 to
2 feet.

Superior South Central 12710 14610 11610 11710. Waves 2 feet or
less.

Superior East 11700 11710 12610 12710 12700. 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