100
FZUS63 KMQT 231439
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
939 AM EST Sun Feb 23 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 30.0 inch trough across southern Lake Superior will
quickly lift north this afternoon as 29.1 inch low pressure moves
out over the Prairie Provinces. The low will then deepen to 28.9
inches as it tracks east, reaching northern Ontario late tonight
and northern Quebec Monday evening. One associated trough at 29.2
inches will cross Lake Superior early Monday followed by a second
at 29.6 inches early on Tuesday. In its wake, a weak 29.9 inch
high pressure ridge will reach Lake Superior Tuesday afternoon.
Another low pressure trough of 29.7 inches will quickly move east
across Lake Superior on Wednesday. A 29.8 inch trough will then
linger back into the Upper Great Lakes through early Thursday. As
that trough departs during Thursday, high pressure of 30.2 inches
will build southeast across northern Ontario. A 29.3 inch low
pressure will then drop southeast into the Upper Great Lakes on
Friday.

LSZ162-232245-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
939 AM EST Sun Feb 23 2025 /839 AM CST Sun Feb 23 2025/

.REST OF TODAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 20 to
30 knots by midnight. A chance of snow in the evening. A chance
of rain. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. A chance of snow
showers, possibly mixed with rain. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-232245-
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-
939 AM EST Sun Feb 23 2025

.REST OF TODAY...Southeast winds 5 to 15 knots veering south by
mid afternoon. A slight chance of snow late in the morning. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 20 to
30 knots by midnight. A chance of rain, possibly mixed with snow.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY...West winds 20 to 30 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A slight chance of snow showers,
possibly mixed with rain after midnight. Waves subsiding to calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. A chance of snow
showers, possibly mixed with rain after midnight. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north. Waves
building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-232245-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
939 AM EST Sun Feb 23 2025

.REST OF TODAY...Southeast winds 10 to 20 knots veering south by
mid afternoon. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then becoming southwest to 30 knots with a
few gale force gusts to 35 knots possible. A chance of freezing
rain in the evening. A chance of rain, possibly mixed with snow.
Freezing rain likely after midnight. Waves building to 7 to 10
feet occasionally to 13 feet.
.MONDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots by mid afternoon.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming north 10 to
20 knots after midnight. A slight chance of rain and snow showers
after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...North winds 5 to 15 knots veering south in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north. Waves
building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-232245-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
939 AM EST Sun Feb 23 2025

.REST OF TODAY...Southeast winds 10 to 20 knots. A chance of snow
late in the morning. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then veering southwest late. A slight
chance of freezing rain and snow in the evening, then a chance of
rain, possibly mixed with freezing rain and snow likely after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 20 to 30 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible by late morning, then
diminishing to 20 to 30 knots by mid afternoon. A slight chance
of rain showers in the morning. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. A slight chance of snow showers after midnight. Waves
calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots. A chance of rain showers. A chance of snow showers.
Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. A
chance of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-232245-
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-
939 AM EST Sun Feb 23 2025

.REST OF TODAY...Southeast winds 5 to 15 knots becoming south
10 to 20 knots. A chance of snow late in the morning. Waves calm
to 2 feet building to 2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible by midnight, then
veering southwest late. A slight chance of freezing rain and
snow. A chance of rain after midnight. Waves building to 7 to
10 feet occasionally to 13 feet.
.MONDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots by mid afternoon.
A chance of rain showers in the morning. Waves building to 7 to
11 feet occasionally to 14 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the 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...South winds 10 to 20 knots veering northwest. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-232245-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
939 AM EST Sun Feb 23 2025

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible by midnight. Rain,
possibly mixed with freezing rain and snow after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west. A chance
of rain showers, possibly mixed with snow in the morning. Waves
subsiding to 5 to 8 feet occasionally to 10 feet, then building
to 7 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest 5 to
15 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots veering northwest. A
chance of snow showers. Waves building to 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-232245-
MAFOR 2316/
Superior West 12400 11410 11420 12540 12640. A chance of rain and
snow this evening, then a chance of rain overnight. Waves 1 foot
or less this afternoon building to 4 to 7 feet tonight. Waves 5
to 8 feet Monday morning.

Superior North Central 12320 11420 11430 11447 11546 19556 12640
19650. A chance of light freezing rain overnight. Waves 1 to 4
feet building to 6 to 9 feet tonight. Waves 7 to 10 feet Monday
morning.

Superior South Central 12320 12430 12440 11540 11640. A chance of
snow late this morning. A chance of rain overnight. A chance of
rain showers Monday morning. Waves 1 to 3 feet this afternoon
building to 3 to 7 feet tonight and Monday morning. Wave heights
are for ice free areas.

Superior East 11310 11320 11420 11430 11440 19450 11447 19457
11547 19557 11640. Waves 2 feet or less this afternoon building
to 6 to 10 feet tonight. Waves 6 to 10 feet Monday morning.

$$

Rolfson

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

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