066
FZUS63 KMQT 182337
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
737 PM EDT Sat May 18 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 29.5 inch low over southern Manitoba tracks
northeast over far northwestern Ontario while deepening to 29.4
inches tonight before weakening to 29.6 inches over Hudson Bay on
Sunday. An associated 29.6 inch trough sweeps across western Lake
Superior this evening before weakening to 29.9 inches while
sailing across far eastern Lake Superior late tonight. By Sunday
morning, a 30.0 inch high pressure ridge settles over Wisconsin
and gradually shifts east over Southern Ontario by Monday morning.
Ridging is displaced by a broad 29.8 inch trough tracking
northeast across the Upper Great Lakes from the Central Plains
Monday evening. On Tuesday, a 29.5 inch low pressure tracks
northeast to the Upper Mississippi Valley while deepening to 29.1
inches. This low tracks across western Lake Superior Wednesday or
Wednesday night before weakening to 29.4 inches over Ontario on
Thursday.

LSZ162-190745-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
737 PM EDT Sat May 18 2024 /637 PM CDT Sat May 18 2024/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Scattered
showers and thunderstorms. Waves 1 to 3 feet subsiding to calm to
2 feet.
.TONIGHT...West winds 15 to 25 knots becoming southwest 10 to
20 knots late. Waves building to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight, then becoming east 10 to 20 knots
late. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ263-190745-
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-
737 PM EDT Sat May 18 2024

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Numerous
rain showers and scattered thunderstorms. Waves 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then backing southwest late. A slight chance of showers
and thunderstorms through midnight. Waves 2 to 4 feet.
.SUNDAY...Southwest 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.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots. Showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 10 to
20 knots. Rain showers likely, then a chance of rain showers.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-190745-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
737 PM EDT Sat May 18 2024

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Scattered
showers and thunderstorms. Waves 3 to 6 feet occasionally to
8 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A chance of showers and thunderstorms through midnight.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Southwest 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.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 10 to
20 knots. Rain showers likely, then a chance of rain showers.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-190745-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
737 PM EDT Sat May 18 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Scattered
showers and thunderstorms. Waves 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Showers with thunderstorms likely through midnight. Waves
subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Rain showers likely
through early afternoon, then a chance of rain showers and a
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-190745-
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-
737 PM EDT Sat May 18 2024

.LATE THIS AFTERNOON...Southeast winds to 30 knots with a few
gale force gusts to 35 knots possible. Isolated showers and
thunderstorms. Waves 3 to 6 feet occasionally to 8 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots after midnight, then veering west late. A chance of
showers and thunderstorms through midnight. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers and a chance of thunderstorms.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-190745-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
737 PM EDT Sat May 18 2024

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots becoming west 10 to
20 knots late. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves
subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the 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. A chance of showers
through early afternoon, then showers likely and a slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers likely, then a chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to 1 to 3 feet.

$$
LSZ261-190745-
MAFOR 1900 AMD/
Superior West 11520 12620 14520. Waves 2 to 4 feet.

Superior North Central 11426 19429 11520 12620 13530. Waves 3 to
5 feet.

Superior South Central 11446 19449 11520 19526 12620 12610 11510.
Waves 2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 3
feet Sunday.

Superior East 11420 19429 11426 19429 11520 11620 11610 12510.
Waves 2 to 4 feet.

$$

07

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weather.gov/greatlakes