028
FZUS63 KMQT 092001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Thu Jul 9 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...

Weak high pressure of 30.0 inches extends over Lake Superior from
Hudson Bay and northern Ontario tonight into Friday. High pressure
builds to 30.1 to 30.2 inches over the lake this weekend as the high
shifts south to the Lower Great Lakes through Sunday. A strong low
of around 29.3 inches looks to cross into Hudson Bay early next week.



LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Thu Jul 9 2026 /301 PM CDT Thu Jul 9 2026/

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...North winds less than 10 knots. Patchy fog. Waves calm
to 2 feet.
.FRIDAY...North winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon, then veering east late. Waves calm to
2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots diminishing to less
than 10 knots after midnight, then backing north late. A slight
chance of showers and thunderstorms after midnight. Waves calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds less than 10 knots becoming
southwest 5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Southwest winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-100800-
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 Thu Jul 9 2026

.LATE THIS AFTERNOON...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...North winds less than 10 knots backing west after
midnight, then backing east late. Patchy fog after midnight.
Waves calm to 2 feet.
.FRIDAY...East winds less than 10 knots backing northeast in the
afternoon, then veering east late. Patchy dense fog through early
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight, then backing east late. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. Waves building to
2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-100800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Thu Jul 9 2026

.LATE THIS AFTERNOON...West winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...West winds less than 10 knots veering northwest after
midnight, then veering northeast late. Patchy fog after midnight.
Waves calm to 2 feet.
.FRIDAY...East winds less than 10 knots veering southeast in the
afternoon, then increasing to 5 to 15 knots late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds less than 10 knots becoming
southwest 5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Thu Jul 9 2026

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

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Patchy
fog after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast late. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-100800-
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 Thu Jul 9 2026

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

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north late.
Patchy fog through midnight. Areas of dense fog after midnight.
Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering southeast in the
afternoon. Areas of dense fog through early afternoon. Waves calm
to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Thu Jul 9 2026

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

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Patchy fog through
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Areas of dense fog through early afternoon. Waves calm
to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering south after
midnight, then backing southeast late. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.

$$

LSZ261-100200-
MAFOR 0921/
Superior West 11100 13800 11100 12200 11100. Waves 1 foot or
less.

Superior North Central 12600 11700 11700 19704 11100 11200 12300.
Waves 1 foot or less.

Superior South Central 11800 12600 11800 19804 11804 11100 19104
11200 11300. Waves 1 foot or less.

Superior East 13700 11704 12804 11700 11600. Waves 1 foot 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