616
FZUS63 KMQT 040202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Sun Aug 3 2025

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 high pressure holds over the Great Lakes tonight.
Meanwhile, a 30.2 inch high over far northern Ontario builds to 30.3
inches. This high pressure will slowly reinvigorate ridging over the
Great Lakes through Tuesday morning as it builds to 30.4 inches over
Quebec. At the same time, 29.8 inch troughing sets up over the High
Plains. These features remain largely stationary on Wednesday. On
Thursday, a low of 29.7 inches emerges over Manitoba while the high
weakens to 30.3 inches off the New England coast. This low brings a
29.9 inch trough over the lake on Friday.


LSZ162-040800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Sun Aug 3 2025 /902 PM CDT Sun Aug 3 2025/

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing
northeast late. Haze. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A slight chance of showers by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming northeast 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
Haze. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Haze through early
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ263-040800-
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-
1002 PM EDT Sun Aug 3 2025

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing south
after midnight, then diminishing to less than 10 knots late.
Haze. Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots backing east in the
afternoon, then increasing to 5 to 15 knots late. Haze by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Haze. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.THURSDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-040800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Sun Aug 3 2025

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing south
after midnight, then diminishing to less than 10 knots late. Haze
by midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots backing east in the
afternoon, then increasing to 5 to 15 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Haze after midnight.
Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Haze through early
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves building to
1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves 1 to 3 feet.
.THURSDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-040800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Sun Aug 3 2025

.REST OF TONIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots. Haze by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Haze. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Haze through early afternoon. Waves calm to
2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ266-040800-
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-
1002 PM EDT Sun Aug 3 2025

.REST OF TONIGHT...South winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Haze. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Haze. Waves calm to
2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Haze through early afternoon. Waves
calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ267-040800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Sun Aug 3 2025

.REST OF TONIGHT...Southeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Haze by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast late.
Haze. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.

$$

LSZ261-040800-
MAFOR 0403/
Superior West 12400 12300 12200 12210. Waves 2 feet or less.

Superior North Central 11500 12400 12300 13200. Waves 2 feet or
less.

Superior South Central 11400 13300 14200. Waves 1 foot or less.

Superior East 11400 12300 14200 11200. 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