176
FZUS63 KMQT 060749
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
349 AM EDT Sun Apr 6 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 30.1 inch trough settles in from the north
and deepens by this evening as a 29.8 inch low organizes over
northern Wisconsin. The low then moves east and deepens further to
29.6 inches near Alpena Michigan Monday morning as 30.5 inch high
pressure moves into northern Manitoba. This high moves into
western Ontario Monday night and weakens to 30.3 inches and moves
across the upper Great Lakes on Tuesday. Ridging at 30.1 inches
remains over Lake Superior Thursday.

LSZ162-061600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
349 AM EDT Sun Apr 6 2025 /249 AM CDT Sun Apr 6 2025/

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 10 to 20 knots veering north late. A
slight chance of snow showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...North winds 20 to 30 knots. A slight chance of snow
showers through midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing northwest.
Waves calm to 2 feet.

$$

LSZ263-061600-
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-
349 AM EDT Sun Apr 6 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. A slight chance
of snow showers. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots veering northeast late. A
slight chance of snow showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...North winds 20 to 30 knots. A chance of snow showers.
Freezing spray after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray through early afternoon. Waves subsiding
to 2 to 4 feet.
.MONDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east. Waves
calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ264-061600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
349 AM EDT Sun Apr 6 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots backing south in the afternoon,
then backing east late. A slight chance of snow showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...North winds 20 to 30 knots. A chance of snow showers.
Freezing spray after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ265-061600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
349 AM EDT Sun Apr 6 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots backing southeast in the
afternoon, then backing east late. A chance of snow showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 20 to
30 knots after midnight, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. A chance of snow
showers. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY...North winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots in the afternoon,
then backing northwest late. Freezing spray. A slight chance of
snow showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Freezing spray through midnight. A
slight chance of snow showers after midnight. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-061600-
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-
349 AM EDT Sun Apr 6 2025

.EARLY THIS MORNING...West winds 10 to 20 knots. A slight chance
of snow showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TODAY...West winds 10 to 20 knots backing east late. A chance of
snow showers by mid afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 20 to
30 knots after midnight, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. A chance of snow
showers. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY...North winds to 30 knots with a few gale force gusts to
35 knots possible. Freezing spray. A slight chance of snow
showers. Waves building to 6 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...North winds to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots after midnight.
Freezing spray. A slight chance of snow showers. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest. Waves
calm to 2 feet.

$$

LSZ267-061600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
349 AM EDT Sun Apr 6 2025

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. A slight
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TODAY...West winds 10 to 20 knots veering north late. A chance
of snow showers by mid afternoon. Waves subsiding to calm to
2 feet.
.TONIGHT...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds to 30 knots with a few gale force gusts to
35 knots possible. Freezing spray. Waves 5 to 8 feet occasionally
to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A slight chance of snow showers through
midnight. Freezing spray. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-061600-
MAFOR 0609/
Superior West 12610 12500 11110 13840. Waves 1 to 2 feet today.
Waves 1 to 2 feet building to 4 to 7 feet tonight.

Superior North Central 11710 11610 11600 11300 11210 11140 11840
11141. A chance of snow showers this evening. Waves 1 to 3 feet
today. Waves 1 to 2 feet building to 5 to 8 feet tonight.

Superior South Central 12610 11500 11310 11210 11120 11830 11840.
A chance of snow showers tonight. Waves 1 to 3 feet subsiding to
1 foot or less today. Waves 1 to 3 feet building to 5 to 8 feet
tonight.

Superior East 11710 11620 11610 11700 11100 11110 11830 11140. A
chance of snow showers tonight. Waves 3 to 5 feet subsiding to 2
to 3 feet today. Waves 1 to 2 feet building to 3 to 6 feet
tonight.

$$

07

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes