028
FZUS63 KMQT 100202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Wed Jul 9 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...

A weak 30.0 to 30.1 inch ridge stays in place over Lake Superior
through Thursday. Ridging is eventually pushed east by a 29.8 inch
trough moving from the Northern Plains into northern Ontario Friday
night into Saturday. Within this trough, two 29.8 inch lows will
combine by Saturday afternoon over northern Ontario. Weak ridging of
at least 29.9 inches then returns to Lake Superior Sunday morning
and holds over head until at least Monday evening.


LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Wed Jul 9 2025 /902 PM CDT Wed Jul 9 2025/

.REST OF TONIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. A slight chance of showers and thunderstorms by
mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
late. A chance of showers and a slight chance of thunderstorms
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers through early afternoon,
then showers likely and a slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering west after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. A chance
of showers. Waves 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-
1002 PM EDT Wed Jul 9 2025

.REST OF TONIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight, then increasing to 5 to 15 knots
late. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. A chance
of showers. Waves 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-
1002 PM EDT Wed Jul 9 2025

.REST OF TONIGHT...West winds 5 to 15 knots backing southwest
after midnight, then becoming south less than 10 knots late.
Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Showers likely and a slight chance of thunderstorms.
Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. A chance of showers. 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. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Wed Jul 9 2025

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Showers likely and a
chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves calm
to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
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-
1002 PM EDT Wed Jul 9 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
through midnight. A slight chance of thunderstorms. Showers
likely after midnight. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. Showers likely and a chance of thunderstorms. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Wed Jul 9 2025

.REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. A chance of showers. A slight chance of
thunderstorms after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots veering west by mid
afternoon. Showers likely and a chance of thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing south. Waves calm to
2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ261-100800-
MAFOR 1003/
Superior West 14200 11210 11110 11100 11200. Waves 1 foot or
less.

Superior North Central 11600 11500 11400 11300 14310. Waves 2
feet or less.

Superior South Central 14300 11310 12220 11310. Waves 2 feet or
less.

Superior East 11710 11700 11800 11100 11400 11600 12200. 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