909
FZUS63 KMQT 170804
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
404 AM EDT Fri May 17 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...As a 29.6 inch low moves north of Lake Superior this
morning, a weak 29.8 inch high pressure ridge will drift across
the western Great Lakes in its wake. As the ridge builds to 29.9
inches while shifting toward the Lower Great Lakes on Saturday, a
29.3 inch low pressure over southern Manitoba will push an
associated 29.6 inch trough toward western Lake Superior. This
trough will weaken to 29.9 inches while moving across Lake
Superior during Saturday night. The parent low pressure that was
over southern Manitoba on Saturday will weaken to 29.7 inches as
it moves over far northern Ontario during Sunday. To its south,
look for a 29.9 inch high pressure ridge to settle over the Upper
Great Lakes. As this ridge builds to 30.1 inches while quickly
shifting to the Mid-Atlantic Coast on Monday, a 29.7 inch low
pressure trough will approach Lake Superior from the west. This
low heads northeast towards James Bay through Monday and a
secondary 29.5 inch low begins to strengthen west of the Upper
Great Lakes Tuesday.



LSZ162-171615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
404 AM EDT Fri May 17 2024 /304 AM CDT Fri May 17 2024/

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing east in the
afternoon, then becoming northeast 10 to 20 knots late. Patchy
fog through early afternoon. A chance of rain showers and a
slight chance of thunderstorms by mid afternoon. Waves building
to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots. A slight chance of
showers and thunderstorms through midnight. Patchy fog after
midnight. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing west late. A chance of
rain showers and a slight chance of thunderstorms. Waves building
to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing east after
midnight. Showers likely after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots backing north. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

$$

LSZ263-171615-
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-
404 AM EDT Fri May 17 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots backing east late. Patchy
fog through early afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers
and thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering southwest late. A chance
of rain showers and a slight chance of thunderstorms. Waves
building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ264-171615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
404 AM EDT Fri May 17 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy dense fog.
Waves 2 to 4 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing southeast late. Patchy fog through early
afternoon. A slight chance of rain showers by mid afternoon.
Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southeast 5 to 15 knots late.
Patchy fog through midnight. A slight chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and
thunderstorms through midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ265-171615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
404 AM EDT Fri May 17 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering south late. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers and thunderstorms
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing southeast
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. Showers
likely, then a chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-171615-
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-
404 AM EDT Fri May 17 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy dense fog.
Waves 1 to 3 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Patchy fog through early
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight. A slight chance of rain showers. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. A chance
of rain showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Waves building to 2 to 4 feet.

$$

LSZ267-171615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
404 AM EDT Fri May 17 2024

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing east late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers and thunderstorms.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east. A chance
of showers. Showers likely. Waves building to 1 to 3 feet.

$$

LSZ261-171615-
MAFOR 1709/
Superior West 11610 11500 11400 12210 11120 11220 11210. A chance
of rain showers this evening. Waves 2 feet or less today. Waves 1
to 3 feet building to 2 to 4 feet tonight.

Superior North Central 11520 19524 11610 11500 11410 13310 11220.
Waves 2 to 4 feet subsiding to 1 to 2 feet today. Waves 1 to 2
feet tonight.

Superior South Central 11600 19604 11600 11500 13210 12310. Waves
2 feet or less.

Superior East 11500 11600 11500 11300 12200 12310. Waves 2 feet
or less.

$$

LC

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

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