470
FZUS63 KMQT 230755
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 AM EDT Thu May 23 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...A 29.4 inch low pressure currently over James Bay
will continue to weaken and slowly drift northeast today. In its
wake, 29.9 inch ridging will build across Lake Superior today.
This ridging shifts east as a 29.7 inch low lifts northeast
through the Northern Plains Thursday night into Friday. Weak
troughing of 29.8 inches moves over Lake Superior by Saturday. By
Sunday, the troughing will move northeast over northern Ontario as
another low of 29.4 inches lifts from the Southern Plains towards
the Upper Great Lakes. This low moves over lower Michigan Monday
morning and becomes centered over Lake Huron Monday evening.

LSZ162-231600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 AM EDT Thu May 23 2024 /255 AM CDT Thu May 23 2024/

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

$$

LSZ263-231600-
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-
355 AM EDT Thu May 23 2024

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots becoming southwest 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
late. A chance of rain showers. A slight chance of thunderstorms
by mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southwest after
midnight. Rain showers through midnight. A slight chance of
thunderstorms. A chance of rain showers after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of rain showers. Waves building to 1 to 3 feet.

$$

LSZ264-231600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 AM EDT Thu May 23 2024

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TODAY...West winds 15 to 25 knots diminishing to 5 to 15 knots.
Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then veering northeast late. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering south after
midnight. Showers and a slight chance of thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 1 to 3 feet.

$$

LSZ265-231600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 AM EDT Thu May 23 2024

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots veering northwest late. Waves
subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering east late. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
A slight chance of rain showers by mid afternoon. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering southwest
after midnight. Showers and a slight chance of thunderstorms.
Waves building to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots becoming north 10 to 20 knots.
Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-231600-
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-
355 AM EDT Thu May 23 2024

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TODAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southeast after
midnight. Showers and a slight chance of thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 2 to 4 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ267-231600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 AM EDT Thu May 23 2024

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

$$

LSZ261-231600-
MAFOR 2309/
Superior West 11620 11610 12510 11400 11300 11210 11230. Waves 1
to 4 feet today. Waves 2 feet or less building to 2 to 3 feet
tonight.

Superior North Central 12640 11630 11620 11610 11700 11800 11100.
Waves 4 to 7 feet subsiding to 1 to 4 feet today and tonight.

Superior South Central 12620 11720 12710 11800 12100. Waves 1 to
4 feet today. Waves 2 feet or less tonight.

Superior East 14630 11620 11610 11710 11700. Waves 4 to 7 feet
today. Waves 2 to 5 feet tonight.

$$

GS

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

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