107
FZUS63 KMQT 030750
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 AM EDT Fri May 3 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 low pressure strengthens to 29.6 inches
and moves into Ontario today while dragging a 29.8 inch trough
with it across Lake Superior. A weak 30.0 inch trough pivots
across the lake on Saturday ahead of ridging that builds to 30.1
inches by Saturday evening; this ridging persists through 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 setup
Tuesday morning as the 29.2 inch low center pushes eastward
against 30.0 inch ridging over far northern Ontario.


LSZ162-031600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 AM EDT Fri May 3 2024 /250 AM CDT Fri May 3 2024/

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

$$

LSZ263-031600-
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-
350 AM EDT Fri May 3 2024

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

$$

LSZ264-031600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 AM EDT Fri May 3 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog. A
slight chance of rain showers. Waves 2 to 4 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. Patchy fog through early afternoon. Waves 2 to
4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon, then backing north late. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A slight chance of rain showers through midnight.
Waves building to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.
.TUESDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers likely. A chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-031600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 AM EDT Fri May 3 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then becoming south 10 to 20 knots late. Patchy fog
through early afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then backing south late. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. A chance of showers. Waves calm to
2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A slight chance of rain showers through midnight.
Waves building to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. Waves building to 1 to 3 feet.
.TUESDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-031600-
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-
350 AM EDT Fri May 3 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog. A
slight chance of rain showers. Waves 2 to 4 feet.
.TODAY...Southwest winds 5 to 15 knots backing southeast late.
Patchy fog through early afternoon. Waves subsiding to 1 to
3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. Waves
1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then backing east late. A chance of
rain showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 2 to 4 feet.
.TUESDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ267-031600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 AM EDT Fri May 3 2024

.EARLY THIS MORNING...Southeast winds 15 to 25 knots. Patchy fog.
A chance of rain showers and a slight chance of thunderstorms.
Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to
4 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southeast late. Patchy
fog through early afternoon. A chance of rain showers and a
slight chance of thunderstorms through early afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of rain
showers by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Rain showers likely through midnight,
then a slight chance of rain showers after midnight. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet.
.TUESDAY...Southeast winds 15 to 25 knots. A chance of showers,
then showers likely. Waves building to 2 to 4 feet.

$$

LSZ261-031600-
MAFOR 0309/
Superior West 12510 13530 12520 11510. Waves 2 to 4 feet building
to 3 to 5 feet today then subsiding to 2 to 4 feet again tonight.


Superior North Central 11410 12520 12530 12520 11510. Waves 2 to
4 feet building to 3 to 5 feet, then subsiding to 2 to 4 feet
again today through tonight.

Superior South Central 11400 11610 11510 11410 11300 12400 11500.
Waves 1 to 3 feet today. Waves 1 foot or less tonight.

Superior East 11330 12510 11400 12300 12410. A chance of rain
showers this morning. Waves 3 to 5 feet subsiding to 1 to 3 feet
today through 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