000
FZUS63 KMQT 250757
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM EDT Thu Apr 25 2024

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...Broad high pressure of 30.4 inches centered north of
Georgian Bay encompasses the Great Lakes region early this morning.
By evening, 30.4 ridging will extend across central and southern
Quebec back into the Great Lakes region. During tonight and Friday,
the ridge, at 30.5 inches, will shift to New England and the
Maritime Provinces while low pressure of 29.2 inches lifts from
eastern Colorado into Nebraska. This low will continue to track
northeast, weakening to 29.6 inches by the time it reaches
northeast Lake Superior on Saturday evening. On Sunday, 30.4 inch
high pressure will build over far northern Ontario as a 29.6 inch
low pressure lifts northeast across the central Plains. This low
will continue to track northeast, crossing Lake Superior during
Monday. In its wake, a 30.0 inch ridge will shift east across the
Mississippi Valley during Monday night.

LSZ162-251600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EDT Thu Apr 25 2024 /257 AM CDT Thu Apr 25 2024/

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots veering south after
midnight, then backing southeast late. Waves subsiding to 1 to
3 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. A chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. Rain showers and a
chance of thunderstorms. Waves building to 2 to 4 feet.
.SATURDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Rain showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots becoming northeast
20 to 30 knots after midnight. A chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northeast winds 20 to 30 knots. A few gale force gusts
to 35 knots possible. Rain showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming west 10 to
20 knots. Rain showers likely. Waves subsiding to calm to 2 feet.

$$

LSZ263-251600-
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-
357 AM EDT Thu Apr 25 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 20 to
30 knots. A slight chance of rain showers by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers through
midnight. A slight chance of thunderstorms. Rain showers after
midnight. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...East winds 10 to 20 knots becoming north 15 to
25 knots by mid afternoon. Rain showers. Waves subsiding to 2 to
4 feet.
.SATURDAY NIGHT...North winds to 30 knots with a few gale force
gusts to 35 knots possible. A chance of rain showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY...Northeast winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots. Rain showers.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming west 10 to
20 knots. Rain showers likely. Waves subsiding to 1 to 3 feet.

$$

LSZ264-251600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EDT Thu Apr 25 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then diminishing to 10 to 20 knots late. Waves building
to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 30 knots. A chance of rain
showers through midnight, then rain showers after midnight. Waves
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 15 to 25 knots backing northeast by
mid afternoon. Rain showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...North winds to 30 knots with a few gale force
gusts to 35 knots possible. A chance of rain showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY...Northeast winds to 30 knots becoming east 20 to 30
knots. A chance of rain showers, then 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...East winds 15 to 25 knots veering west. Rain showers
likely. Waves subsiding to 1 to 3 feet.

$$

LSZ265-251600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EDT Thu Apr 25 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. Waves building
to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming south 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots. Rain showers. A
slight chance of thunderstorms after midnight. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY...Southeast winds 15 to 25 knots veering south by mid
afternoon. Showers and a chance of thunderstorms. Waves subsiding
to 1 to 3 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming north 20 to
30 knots after midnight. A chance of thunderstorms through
midnight. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...Northeast winds 20 to 30 knots veering east. 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...Southeast winds 15 to 25 knots veering west. Rain
showers likely, then a chance of rain showers. Waves subsiding to
calm to 2 feet.

$$

LSZ266-251600-
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-
357 AM EDT Thu Apr 25 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southeast winds 15 to 25 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds to 30 knots diminishing to 20 to
30 knots after midnight. A chance of rain showers through
midnight, then rain showers and a slight chance of thunderstorms
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 20 to 30 knots becoming south 15 to
25 knots by mid afternoon. Rain showers. Waves subsiding to 2 to
4 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering north after
midnight. A chance of showers and thunderstorms. Waves building
to 5 to 8 feet occasionally to 10 feet.
.SUNDAY...Northeast winds 20 to 30 knots veering east. 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...Southeast winds 20 to 30 knots becoming west 15 to
25 knots. Rain showers likely, then a chance of rain showers.
Waves subsiding to 2 to 4 feet.

$$

LSZ267-251600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EDT Thu Apr 25 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots backing southeast after
midnight, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY NIGHT...Southeast winds 20 to 30 knots. A chance of rain
showers through midnight, then rain showers after midnight. Waves
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 20 to 30 knots veering south by mid
afternoon. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Rain showers likely through
midnight. A chance of thunderstorms. Waves subsiding to 2 to
4 feet.
.SUNDAY...Northeast winds 15 to 25 knots becoming east 20 to
30 knots. Rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southeast winds 20 to 30 knots becoming west 15 to
25 knots. Rain showers, then a chance of rain showers. Waves
subsiding to 1 to 3 feet.

$$

LSZ261-251600-
MAFOR 2509/
Superior West 13200 12210 11220 11310 11420. Waves 1 to 3 feet
tonight.

Superior North Central 11400 13310 11320 12330 11430. Waves 1 to
4 feet.

Superior South Central 11400 11410 12310 12320 12420. Waves 1 to
4 feet.

Superior East 12400 14310 11410 11310. Waves 1 to 3 feet.

$$

Rolfson

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

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