230
FZUS63 KMQT 211412
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1012 AM EDT Sat Sep 21 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 29.7 inch trough moving across Lake Superior will
dissipate early today, allowing weak 29.9 inch ridging to anchor
over the Upper Great Lakes this morning. A new low pressure of
29.6 inches over southern Manitoba this morning will then track
across far northern Ontario this afternoon and tonight. Its
associated 29.9 inch trough will sweep across Lake Superior during
tonight and Sunday morning. In its wake, 30.1 inch high pressure
will build from the Northern Plains into northern Ontario during
Sunday and Monday. Also on Monday, a 29.7 inch low pressure will
track northeast to southern Wisconsin. 30.0 inch high pressure
builds over the Lower MS Valley Tuesday, building to 30.1 inches
Wednesday.

LSZ162-212215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1012 AM EDT Sat Sep 21 2024 /912 AM CDT Sat Sep 21 2024/

.REST OF TODAY...East winds 10 to 20 knots backing northeast
late. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A slight chance of showers and thunderstorms through midnight.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-212215-
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-
1012 AM EDT Sat Sep 21 2024

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. A chance of showers and a slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of showers and
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ264-212215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1012 AM EDT Sat Sep 21 2024

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. A slight chance of showers and thunderstorms by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming northwest 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ265-212215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1012 AM EDT Sat Sep 21 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
in the afternoon, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then becoming northwest 15 to 25 knots late. A chance
of showers and thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots veering northeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-212215-
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-
1012 AM EDT Sat Sep 21 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
in the afternoon, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then becoming northwest 15 to 25 knots late. A chance
of showers and thunderstorms. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots. A chance of showers and
a slight chance of thunderstorms through early 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...North winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-212215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1012 AM EDT Sat Sep 21 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
in the afternoon, then backing east late. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late. A
chance of showers and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. Showers likely through early afternoon. A slight chance
of thunderstorms. A slight chance of showers 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...North winds 15 to 25 knots. A slight chance of
showers through midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves calm to 2 feet.

$$
LSZ261-212215-
MAFOR 2115/
Superior West 11310 11220 11320 11620 14730. A chance of showers
this afternoon. A chance of showers and thunderstorms this
evening. Waves 1 foot or less this afternoon. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday
morning.

Superior North Central 11300 11310 11320 11420 11620 13730. A
chance of showers tonight. Waves 1 to 2 feet this afternoon.
Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5
feet Sunday morning.

Superior South Central 11400 11310 11320 11420 11520 11620 12730.
A chance of showers this evening, then a chance of showers and
thunderstorms overnight. A chance of showers Sunday morning.
Waves 2 feet or less this afternoon. Waves 1 to 3 feet tonight.
Waves 3 to 6 feet Sunday morning.

Superior East 11400 11300 12310 11420 11510 11626 11736. Waves 1
foot or less this afternoon. Waves 1 to 3 feet tonight. Waves 3
to 6 feet Sunday morning.

$$

Voss

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

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