892
FZUS63 KMQT 312002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Thu Jul 31 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...

30.3 inch high pressure over Lake Superior maintains its strength
over the western Great Lakes through Saturday. Sunday, it weakens to
30.2 inches as it shifts to the Lower Great Lakes and east. This
high continues to slide eastward Monday while another 30.2 inch high
slides across the shores of the Hudson Bay. This high will build to
30.3 inches over Quebec into the middle of next week.


LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Thu Jul 31 2025 /302 PM CDT Thu Jul 31 2025/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Haze. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Haze. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Haze. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Haze. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ263-010800-
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-
402 PM EDT Thu Jul 31 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Haze.
Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots late. Haze. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Haze. Areas of smoke after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Haze. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Thu Jul 31 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Haze.
Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then veering west late. Haze. Waves
building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Haze. Areas of smoke after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Haze. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Thu Jul 31 2025

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds less than 10 knots becoming southwest 5 to
15 knots after midnight. Haze after midnight. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots. Haze. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. Haze. Waves calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Haze. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-010800-
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-
402 PM EDT Thu Jul 31 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Haze. Waves
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight. Haze through midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then increasing to 10 to 20 knots late. Haze. Waves
building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots late. Haze. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Haze through early afternoon. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Thu Jul 31 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west late. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then increasing to 10 to 20 knots late. Haze. Waves
calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight, then veering west late. Haze. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Haze. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ261-010200-
MAFOR 3121/
Superior West 13500 11600 12610 12510. Waves 1 foot or less
tonight. Waves 1 to 3 feet Friday.

Superior North Central 12500 13510 11610 11620 11520. Waves 2
feet or less tonight. Waves 1 to 3 feet building to 2 to 4 feet
Friday.

Superior South Central 11100 11200 12500 11510 13610. Waves 2
feet or less.

Superior East 13700 11600 11500 12510 11610. 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