749
FZUS63 KMQT 222047
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 PM EST Sat Feb 22 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 29.8 inch low pressure extending from northern
Ontario will continue to sweep east while the tail end of this
trough at a pressure of 30.0 inches will drop south to southern
Lake Superior during tonight. The trough will then quickly lift
north on Sunday as 29.2 inch low pressure moves out over the
Prairie Provinces. The low will then track east, reaching northern
Ontario Sunday night and northern Quebec Monday evening. One
associated trough at 29.4 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 into Tuesday evening. Another low
pressure trough of 29.7 inches will quickly move east across Lake
Superior on Wednesday. Weak 29.9 inch low pressure follows from
the northwest Thursday before high pressure follows into Friday.

LSZ162-230500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EST Sat Feb 22 2025 /247 PM CST Sat Feb 22 2025/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of snow. Waves 3 to 5 feet occasionally to 7 feet subsiding to
2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots veering north by midnight,
then veering east late. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots by midnight, then increasing to 20 to 30 knots
late. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots backing southwest in
the afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-230500-
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-
347 PM EST Sat Feb 22 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots becoming north 5 to 15 knots
by midnight, then veering northeast late. Waves subsiding to calm
to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots by midnight, then increasing to 20 to 30 knots
late. A chance of rain showers. A slight chance of snow showers
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming north 5 to
15 knots 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...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-230500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EST Sat Feb 22 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then becoming southwest 20 to 30 knots
late. A chance of rain and snow showers. Waves building to 4 to
7 feet occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon. A slight chance of rain showers in the morning.
Waves building to 4 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots 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...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-230500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EST Sat Feb 22 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. A slight chance
of snow. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by late
morning, then increasing to 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then veering southwest late. A slight
chance of rain showers, freezing rain and snow showers in the
evening, then rain showers, possibly mixed with snow after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 15 to 25 knots. 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 chance of rain showers. A chance of freezing rain
after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-230500-
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-
347 PM EST Sat Feb 22 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A chance of
snow. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots veering north by midnight,
then becoming northeast 5 to 15 knots late. A slight chance of
snow in the evening. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south by late morning,
then increasing to 10 to 20 knots by mid afternoon. Waves
building to 1 to 3 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots by midnight. A slight chance of snow showers in the
evening, then snow showers likely, possibly mixed with rain
showers after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon. A chance of rain showers in the morning. Waves
subsiding to 4 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming north 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots. Waves 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-230500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EST Sat Feb 22 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Snow. Waves
3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots veering north by midnight,
then becoming northeast 5 to 15 knots late. A chance of snow.
Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast by late
morning, then increasing to 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots by midnight. Snow showers, possibly mixed with rain
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. A chance of snow showers in the
morning. A chance of rain showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots backing south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots backing north. Waves
building to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-230500-
MAFOR 2222/
Superior West 11630 11720 11800 11200 13300 11400. Waves 3 to 5
feet subsiding to 1 foot or less tonight and Sunday.

Superior North Central 11620 11710 11810 11110 11200 12310 11320.
Waves 3 to 5 feet subsiding to 1 to 3 feet tonight and Sunday.

Superior South Central 12620 11710 12700 11400 12310. A chance of
snow early this evening. Waves 2 feet or less. Wave heights are
for ice free areas.

Superior East 11627 11620 11810 12110 11200 12310. Waves 3 to 6
feet subsiding to 1 to 3 feet tonight and Sunday.

$$

BW

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

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