648
FZUS63 KMQT 070802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sat Jun 7 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...

30.0 inch high pressure ridging slowly weakens over Lake Superior
today. Meanwhile, a 29.4 inch low moves southeast through central
Canada toward Lake Superior, bringing 29.6 inch troughing to Lake
Superior Sunday. This low weakens through the day over Ontario, then
lifts north into James Bay Monday night. 29.9 inch ridging builds
back over the lake late Wednesday before strengthening to at least
30.0 inches by Thursday.


LSZ162-072000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sat Jun 7 2025 /301 AM CDT Sat Jun 7 2025/

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. Isolated
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming south 10 to 20 knots
late. Isolated showers through midnight. A chance of
thunderstorms. Showers after midnight. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of thunderstorms through midnight.
Showers likely. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Showers. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. A chance of showers
through midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northeast. A
chance of showers. Waves calm to 2 feet.

$$

LSZ263-072000-
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 AM EDT Sat Jun 7 2025

.EARLY THIS MORNING...Southeast winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Isolated showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A chance of showers. A slight chance of thunderstorms
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
late. Rain showers through early afternoon. A chance of
thunderstorms. A chance of rain showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A slight chance of thunderstorms through midnight. A
chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-072000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sat Jun 7 2025

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves building to 2 to 4 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
late. Showers through early afternoon. A slight chance of
thunderstorms. A chance of showers by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of rain
showers and a slight chance of thunderstorms. Waves subsiding to
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-072000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sat Jun 7 2025

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight. A slight chance of showers after midnight. Waves
building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of showers through early
afternoon. A chance of thunderstorms. Showers by mid afternoon.
Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-072000-
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 AM EDT Sat Jun 7 2025

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots backing southeast in the
afternoon, then diminishing to 10 to 20 knots late. A chance of
showers through early afternoon. A chance of thunderstorms.
Showers by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of
thunderstorms through midnight. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots backing northwest after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-072000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sat Jun 7 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots veering east late. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then becoming southeast 15 to 25 knots late. Waves
building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers and a slight chance of thunderstorms
through midnight, then a chance of showers after midnight. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing east by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering west after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. A chance
of rain showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-071400-
MAFOR 0709/
Superior West 14200 12210 11310 11420. Waves 1 foot or less
today. Waves 1 to 3 feet tonight.

Superior North Central 11400 11300 12310 13320 11420. Waves 2
feet or less today. Waves 2 to 4 feet tonight.

Superior South Central 12300 11310 11220 12320 12420. Waves 2
feet or less today. Waves 1 to 3 feet tonight.

Superior East 11100 12300 11200 11210 12310 11420. Waves 1 foot
or less today. Waves 2 feet or less building to 2 to 3 feet
tonight.

$$

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