327
FZUS63 KMQT 050800
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sun May 5 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...Ridging at 30.1 inches returns across the lake today
then shifts east 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 move 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.


LSZ162-051600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sun May 5 2024 /300 AM CDT Sun May 5 2024/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then becoming south 10 to 20 knots late. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of rain showers after
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...East winds 15 to 25 knots backing northeast by mid
afternoon. Rain showers likely. Waves building to 4 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots. Rain showers
likely through midnight. A chance of rain showers after midnight.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 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.

$$

LSZ263-051600-
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-
400 AM EDT Sun May 5 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 2 to 4 feet.
.TONIGHT...Southwest winds 5 to 15 knots diminishing to less than
10 knots late. Waves subsiding to calm to 2 feet.
.MONDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of rain showers after
midnight. Waves 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 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 2 to 4 feet.

$$

LSZ264-051600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sun May 5 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 2 to 4 feet.

$$

LSZ265-051600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sun May 5 2024

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then veering southwest late. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of showers through early afternoon,
then showers likely by mid afternoon. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves subsiding to calm to
2 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.THURSDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-051600-
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-
400 AM EDT Sun May 5 2024

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ267-051600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sun May 5 2024

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. A chance of rain showers by
mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight. Rain showers likely. Waves 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.
.THURSDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-051600-
MAFOR 0509/
Superior West 12610 12510 11410 11400 12500. Waves 2 feet or
less.

Superior North Central 11620 12610 11510 12520 12510. Waves 1 to
3 feet.

Superior South Central 12620 11610 12600 12400 11500. Waves 1 to
3 feet today. Waves 1 foot or less tonight.

Superior East 12720 12610 11600 13500. Waves 2 to 4 feet today.
Waves 1 to 2 feet tonight.

$$

WFO MQT

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

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