227
FZUS63 KMQT 161401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Thu Jul 16 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 into Friday while
gradually shifting east towards the St. Lawrence Seaway. Low
pressure passing through the Northern Plains looks to traverse the
the lake at around 29.7 inches Friday evening into Saturday morning.
Following the low, weak 29.9 to 30.0 inch ridging returns to Lake
Superior late Saturday and remains through Sunday. Afterwards, a
29.5 inch low pressure diving southeast over northern Ontario looks
to bring 29.6 inch troughing over Lake Superior on Monday.



LSZ162-162000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Thu Jul 16 2026 /900 AM CDT Thu Jul 16 2026/

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

.REST OF TODAY...North winds 5 to 15 knots veering northeast in
the afternoon, then increasing to 10 to 20 knots late. Smoke.
Waves calm to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Smoke. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Areas of smoke. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Areas of smoke through midnight. Showers likely
and a chance of thunderstorms through midnight, then a chance of
showers after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west. A chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of thunderstorms.
A chance of showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

$$

LSZ263-162000-
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-
1000 AM EDT Thu Jul 16 2026

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

.REST OF TODAY...Northwest winds less than 10 knots becoming
northeast 5 to 15 knots in the afternoon. Smoke. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots. Patchy smoke. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Smoke. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Areas of smoke through midnight. Showers likely
through midnight. A chance of thunderstorms. A slight chance of
showers after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers and thunderstorms. Waves building
to 1 to 3 feet.
.MONDAY...North winds 15 to 25 knots. A chance of showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-162000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Thu Jul 16 2026

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

.REST OF TODAY...North winds less than 10 knots veering northeast
in the afternoon, then veering southwest late. Smoke. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast after
midnight. Patchy smoke. A slight chance of showers after
midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots. Patchy smoke through
early afternoon. Smoke by mid afternoon. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Areas of smoke through midnight. Showers likely and a
chance of thunderstorms through midnight, then a slight chance of
showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...Northwest winds 15 to 25 knots. Showers likely, then a
chance of showers. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.

$$

LSZ265-162000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Thu Jul 16 2026

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

.REST OF TODAY...Northwest winds 5 to 15 knots veering northeast
late. Smoke. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing southeast after
midnight, then increasing to 10 to 20 knots late. Smoke through
midnight, then patchy smoke after midnight. A slight chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of smoke. Showers likely and a slight chance
of thunderstorms. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering northwest
after midnight. Areas of smoke through midnight. Showers through
midnight. A chance of thunderstorms. A chance of showers after
midnight. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...North winds 20 to 30 knots becoming northwest gales to
35 knots. Showers likely, then a chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet.

$$

LSZ266-162000-
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-
1000 AM EDT Thu Jul 16 2026

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

.REST OF TODAY...Northwest winds 5 to 15 knots. Smoke. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing south after
midnight, then backing southeast late. Smoke. A slight chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Patchy smoke. A chance of showers and
a slight chance of thunderstorms. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming west
15 to 25 knots after midnight. Areas of smoke through midnight.
Showers through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves building to 2 to 4 feet.
.MONDAY...Northwest winds 15 to 25 knots becoming north gales to
35 knots. Showers likely, then a chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet.

$$

LSZ267-162000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Thu Jul 16 2026

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

.REST OF TODAY...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.
.TONIGHT...Northwest winds 5 to 15 knots backing west after
midnight, then backing southeast late. Areas of smoke. Waves calm
to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy smoke. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering southwest
after midnight. Areas of smoke through midnight. Showers and a
chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northwest winds 15 to 25 knots. A slight chance of
showers through early afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 2 to 4 feet.
.MONDAY...Northwest winds 15 to 25 knots veering north. Showers
likely. Waves 2 to 4 feet.

$$

LSZ261-162000-
MAFOR 1615/
Superior West 11800 11100 12110 13210 11200. A chance of showers
overnight and Friday morning. Waves 1 foot or less.

Superior North Central 11800 11600 12500 11400 11300 12310. A
chance of showers Friday morning. Waves 1 foot or less.

Superior South Central 11810 12800 11500 11400 12310 11426. Waves
2 feet or less.

Superior East 12700 11600 12700 11600 11400 11300. A chance of
showers Friday morning. 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