721
FZUS63 KMQT 031347
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 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 29.6 inch low pressure near Lake Winnipeg this
morning drags a 29.8 inch trough with across Lake Superior the
rest of today into tonight. A weak 30.0 inch trough pivots across
the lake late tonight ahead of ridging that builds to 30.1 inches
by Saturday morning. A weak 29.9 inch trough moves into the Upper
Great Lakes Saturday evening before ridging at 30.1 inches returns
by 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 a deepening 29.0 inch low low pushes
eastward against 30.0 inch ridging over far northern Ontario.

LSZ162-032200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EDT Fri May 3 2024 /847 AM CDT Fri May 3 2024/

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon. Waves 1 to 3 feet 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.

$$

LSZ263-032200-
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-
947 AM EDT Fri May 3 2024

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
20 to 30 knots in the afternoon, then diminishing to 15 to
25 knots late. Patchy fog by late morning. Waves 2 to 4 feet
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.

$$

LSZ264-032200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EDT Fri May 3 2024

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon. Patchy fog by late morning.
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.

$$

LSZ265-032200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EDT Fri May 3 2024

.REST OF TODAY...West winds 5 to 15 knots backing south in the
afternoon. Waves 1 to 3 feet 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.

$$

LSZ266-032200-
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-
947 AM EDT Fri May 3 2024

.REST OF TODAY...Southwest winds 10 to 20 knots backing southeast
late. Waves 2 to 4 feet 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.

$$

LSZ267-032200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EDT Fri May 3 2024

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon, then backing southeast late. A
slight chance of showers and thunderstorms by late morning. Waves
1 to 3 feet 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.

$$
LSZ261-032200-
MAFOR 0315/
Superior West 11530 11540 11530 12520 11510 11500 11600. A chance
of showers Saturday morning. Waves 2 to 4 feet building to 3 to 5
feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight. Waves 1 to 2 feet Saturday morning.

Superior North Central 11520 11530 13520 11510 12500. Waves 3 to
5 feet subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet
tonight. Waves 1 to 3 feet Saturday morning.

Superior South Central 11520 11410 11310 12400 11500 12400. Waves
1 to 3 feet this afternoon. Waves 1 foot or less tonight and
Saturday morning.

Superior East 11610 11400 11310 11300 12410 11400 11410. Waves 1
to 3 feet.

$$

TAP

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

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