972
FZUS63 KMQT 041954
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 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 trough currently moving into the are
should slide east of Lake Superior late tonight. 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.


LSZ162-050400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EDT Sat May 4 2024 /254 PM CDT Sat May 4 2024/

.LATE THIS AFTERNOON...West winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Patchy fog through midnight.
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.

$$

LSZ263-050400-
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-
354 PM EDT Sat May 4 2024

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A chance of
rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Patchy fog through midnight.
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.

$$

LSZ264-050400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EDT Sat May 4 2024

.LATE THIS AFTERNOON...North winds 5 to 15 knots. A chance of
rain showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
A slight chance of rain showers through midnight. Patchy fog.
Waves 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.

$$

LSZ265-050400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EDT Sat May 4 2024

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Rain showers
likely. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots backing west after
midnight. A chance of rain showers through midnight. Waves
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.

$$

LSZ266-050400-
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-
354 PM EDT Sat May 4 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of
rain showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots. A chance of rain
showers through midnight. Patchy fog. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 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.

$$

LSZ267-050400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EDT Sat May 4 2024

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A chance
of showers. Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering west after
midnight, then becoming northwest 15 to 25 knots late. Patchy
fog. Rain showers through midnight. A chance of rain showers and
a slight chance of thunderstorms after midnight. Waves 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.

$$

LSZ261-050400-
MAFOR 0421/
Superior West 11700 11600 13610 11600 11500 11510. A chance of
rain showers early this evening. Waves 2 feet or less.

Superior North Central 11810 11710 11720 12620 13610. A chance of
rain showers this evening. Waves 1 to 3 feet building to 2 to 4
feet tonight. Waves 2 to 3 feet Sunday.

Superior South Central 11810 11710 11720 13620 11610 11700. A
chance of rain showers this evening. Waves 1 to 3 feet building
to 2 to 4 feet tonight. Waves 2 to 4 feet subsiding to 1 to 3
feet Sunday.

Superior East 11320 11326 11616 11620 12720 11710 11610. Waves 2
to 4 feet.

$$

LC

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weather.gov/mqt/glftable

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weather.gov/greatlakes