733
FZUS63 KMQT 050138
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
938 PM EDT Sat May 4 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 weak 29.9 inch low pressure trough currently over
eastern Lake Superior moves out of the area later tonight, then
ridging at 30.1 inches returns across the lake on Sunday. Ridging
shifts east early next week as a broad 29.2 inch low pressure
develops on the Northern Plains on Monday. A strong pressure
gradient over western Lake Superior begins to set up Tuesday
morning as a deepening 29.0 inch low pushes eastward against 30.0
inch ridging over far northern Ontario. This gradient loosens into
Wednesday as the Northern Plains low weakens and a 29.5, and a
29.4 inch low ejecting out of the Plains moves south of Lake
Superior. After a brief window of height rises late in the day
Wednesday, another 29.4 inch low moves from the Central Plains
into the Lower Great Lakes early Thursday.




LSZ162-050945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
938 PM EDT Sat May 4 2024 /838 PM CDT Sat May 4 2024/

.REST OF TONIGHT...West winds 5 to 15 knots. Patchy fog by late
evening. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering west after
midnight, then backing south late. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY NIGHT...East winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...East winds 20 to 30 knots backing northeast by mid
afternoon. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves 2 to 4 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ263-050945-
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-
938 PM EDT Sat May 4 2024

.REST OF TONIGHT...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots late. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves 1 to 3 feet.
.TUESDAY...East winds 20 to 30 knots. Rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots backing northeast
after midnight. Rain showers likely through midnight. A chance of
thunderstorms. A chance of rain showers after midnight. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-050945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
938 PM EDT Sat May 4 2024

.REST OF TONIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of rain showers by late
evening. Patchy fog. Waves calm to 2 feet building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west late.
Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 20 to 30 knots. A chance of rain showers
through early afternoon, then rain showers by mid afternoon.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely
through midnight. A chance of rain showers after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-050945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
938 PM EDT Sat May 4 2024

.REST OF TONIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A slight chance of rain showers by late evening. Patchy fog after
midnight. Waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...East winds 15 to 25 knots. A chance of showers through
early afternoon, then showers by mid afternoon. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely
through midnight. A chance of thunderstorms. A chance of rain
showers after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots veering northeast. A
chance of rain showers. Waves 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots. A chance of rain showers.
Waves 2 to 4 feet.

$$

LSZ266-050945-
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-
938 PM EDT Sat May 4 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. A chance of rain showers by late evening. Patchy fog. Waves
1 to 3 feet building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. A chance of rain showers
through early afternoon, then rain showers likely by mid
afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots. Rain showers likely
through midnight. A chance of thunderstorms. A chance of rain
showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots. A chance of rain showers.
Waves 2 to 4 feet.

$$

LSZ267-050945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
938 PM EDT Sat May 4 2024

.REST OF TONIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots late. Patchy dense fog. Rain showers by late
evening. A slight chance of thunderstorms. A chance of rain
showers after midnight. Waves 1 to 3 feet subsiding to calm to
2 feet, then building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Rain showers likely by mid afternoon.
Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 20 to 30 knots backing east
after midnight. Showers likely and a chance of thunderstorms.
Waves building to 2 to 4 feet.
.WEDNESDAY...East winds 15 to 25 knots backing northeast. A
chance of rain showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots. A chance of rain showers.
Waves 1 to 3 feet.

$$
LSZ261-050945-
MAFOR 0503/
Superior West 12610 12600 11500 12510 11500. Waves 1 to 2 feet.

Superior North Central 13620 13610 12520. Waves 1 to 3 feet
building to 2 to 4 feet overnight. Waves 2 to 4 feet Sunday and
Sunday evening.

Superior South Central 11720 13620 11610 11700 11600 11500. Waves
2 to 4 feet overnight. Waves 2 to 4 feet subsiding to 1 to 3 feet
Sunday. Waves 1 foot or less Sunday evening.

Superior East 11626 11720 11724 11720 11710 12610 11600. Waves 2
to 4 feet.

$$

LC

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

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