358
FZUS63 KMQT 270811
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
411 AM EDT Sat Apr 27 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...Low pressure of 29.5 inches over southwest Minnesota
will weaken to 29.6 inches as it tracks northeast, crossing western
Lake Superior today and exiting northern Lake Superior by evening.
During tonight and Sunday, 30.4 inch high pressure will build over
northern Ontario as a 29.6 inch low pressure slowly lifts northeast
across the Central Plains. This low will continue to track
northeast, crossing western Lake Superior late in the day on Monday
at 29.7 inches. As the low moves over northern Ontario Monday night,
a weak 29.9 inch ridge will shift east across the Mississippi
Valley. On Tuesday, the ridge will move toward the Appalachians as
the next low pressure of 29.6 inches tracks from the Dakotas to
northern Minnesota. This low will pass just north of Lake Superior
on Wednesday. In its wake, a 29.9 inch ridge will shift east to the
western Great Lakes by Wednesday evening.

LSZ162-271615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
411 AM EDT Sat Apr 27 2024 /311 AM CDT Sat Apr 27 2024/

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY
MORNING...

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Rain
showers and isolated thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon, then becoming west 10 to 20 knots
late. Rain showers and isolated thunderstorms through early
afternoon, then isolated rain showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight, then becoming northeast 15 to 25 knots late. A slight
chance of rain showers through midnight. Waves subsiding to calm
to 2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northeast gales to 35 knots becoming east gales to
40 knots in the afternoon, then backing northeast late. A chance
of rain showers. Waves building to 10 to 14 feet occasionally to
18 feet.
.SUNDAY NIGHT...East gales to 40 knots. Rain showers. Waves 10 to
14 feet occasionally to 18 feet.
.MONDAY...Northeast gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Rain showers likely. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing east. Rain
showers likely. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-271615-
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-
411 AM EDT Sat Apr 27 2024

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...East winds 10 to 20 knots. Rain showers and
isolated thunderstorms. Waves 4 to 8 feet occasionally to
10 feet subsiding to 4 to 7 feet occasionally to 9 feet.
.TODAY...East winds 5 to 15 knots becoming north 10 to 20 knots
in the afternoon, then backing west late. Scattered rain showers
and isolated thunderstorms. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering northeast late.
A slight chance of rain showers through midnight. Waves subsiding
to 1 to 3 feet, then building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to gales to
35 knots. A chance of rain showers by mid afternoon. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY NIGHT...East gales to 40 knots. Rain showers. Waves 7 to
10 feet occasionally to 13 feet building to 10 to 14 feet
occasionally to 18 feet.
.MONDAY...East gales to 35 knots diminishing to 20 to 30 knots by
mid afternoon. Rain showers likely. Waves subsiding to 6 to
9 feet occasionally to 11 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to 2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots. Rain showers likely. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ264-271615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
411 AM EDT Sat Apr 27 2024

...GALE WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...Southeast winds 15 to 25 knots. Scattered
rain showers and isolated thunderstorms. Waves 5 to 9 feet
occasionally to 11 feet.
.TODAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon, then veering west late. Scattered rain
showers and isolated thunderstorms. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 20 to 30 knots becoming north 15 to
25 knots after midnight. A slight chance of rain showers through
midnight. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots late. Rain showers likely by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...East gales to 40 knots. Rain showers. Waves
building to 10 to 14 feet occasionally to 18 feet.
.MONDAY...East gales to 35 knots diminishing to 20 to 30 knots by
mid afternoon. Rain showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...Southwest winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ265-271615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
411 AM EDT Sat Apr 27 2024

...GALE WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...Southeast winds 15 to 25 knots. Scattered
rain showers and isolated thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...Southeast winds 15 to 25 knots veering south in the
afternoon, then veering west late. A few gale force gusts to
35 knots possible late. Scattered showers and isolated
thunderstorms. Waves subsiding to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots veering north late. A slight
chance of rain showers through midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...Northeast winds 15 to 25 knots. A chance of rain
showers by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...East gales to 35 knots. Rain showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.MONDAY...East gales to 35 knots diminishing to 15 to 25 knots by
mid afternoon. Rain showers likely through early afternoon, then
a chance of rain showers by mid afternoon. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 15 to 25 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-271615-
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-
411 AM EDT Sat Apr 27 2024

...GALE WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Rain
showers and isolated thunderstorms. Waves 5 to 9 feet
occasionally to 11 feet.
.TODAY...Southeast winds 20 to 30 knots veering south in the
afternoon, then becoming southwest 15 to 25 knots late. Scattered
rain showers and isolated thunderstorms. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight, then becoming north 20 to 30 knots late. A few gale
force gusts to 35 knots possible early this evening. A slight
chance of rain showers through midnight. Waves building to 4 to 7
feet occasionally to 9 feet.
.SUNDAY...Northeast winds 15 to 25 knots. A chance of rain
showers by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...East gales to 35 knots. Rain showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
.MONDAY...East gales to 35 knots becoming southeast 20 to
30 knots by mid afternoon. Rain showers. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of rain showers through
midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ267-271615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
411 AM EDT Sat Apr 27 2024

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Rain
showers and isolated thunderstorms. Waves 5 to 9 feet
occasionally to 11 feet.
.TODAY...Southeast winds 20 to 30 knots veering south in the
afternoon, then diminishing to 15 to 25 knots late. Numerous rain
showers through early afternoon. Isolated thunderstorms.
Scattered rain showers by mid afternoon. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots veering north late. A few
gale force gusts to 35 knots possible early this evening. A
slight chance of rain showers through midnight. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots veering northeast in the
afternoon. Rain showers likely by mid afternoon. Waves subsiding
to 2 to 4 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Rain showers. Waves building to 4 to
7 feet occasionally to 9 feet.
.MONDAY...East gales to 35 knots becoming southeast 20 to
30 knots by mid afternoon. Rain showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. A chance of rain showers through
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. A
chance of rain showers. Waves 1 to 3 feet.

$$

LSZ261-271615-
MAFOR 2709/
Superior West 11236 11136 11120 19126 11710 19716 11620 11710
11820 11130. Waves 2 to 6 feet.

Superior North Central 11330 19336 11336 11330 19336 11426 11620
19626 11730 12840. Waves 5 to 9 feet subsiding to 4 to 7 feet
today. Waves 3 to 6 feet building to 5 to 7 feet tonight.

Superior South Central 11336 11340 19346 11440 11420 19426 11630
19646 11630 11730 11830. Waves 3 to 6 feet.

Superior East 11346 12340 19346 11430 19436 11530 19536 11630
19640 11630 11730. Waves 5 to 8 feet building to 7 to 10 feet,
then subsiding to 5 to 8 feet today. Waves 3 to 7 feet tonight.

$$

Rolfson

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

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