770
FZUS63 KMQT 030128
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
928 PM EDT Thu May 2 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 in the Upper Mississippi
Valley will drag a 29.8 inch trough across Lake Superior tonight
before wandering northeast over Ontario and deepening to 29.6
inches on Friday. 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.

LSZ162-030930-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
928 PM EDT Thu May 2 2024 /828 PM CDT Thu May 2 2024/

.REST OF TONIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight, then becoming southwest 5 to
15 knots late. Patchy fog. Scattered rain showers. Waves 3 to
6 feet occasionally to 8 feet subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Patchy fog through early afternoon. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots. A slight chance
of rain showers after midnight. Waves subsiding to calm to
2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. 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 east after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots becoming east 20 to
30 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.

$$

LSZ263-030930-
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-
928 PM EDT Thu May 2 2024

.REST OF TONIGHT...East winds 10 to 20 knots becoming south 5 to
15 knots late. Patchy fog. Numerous rain showers by late evening.
Scattered rain showers after midnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.FRIDAY...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.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers. Waves building to 2 to 4 feet.
.TUESDAY...East winds 20 to 30 knots becoming northeast 15 to
25 knots. Rain showers likely. A chance of thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-030930-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
928 PM EDT Thu May 2 2024

.REST OF TONIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southeast late. Patchy fog.
Scattered rain showers. Waves calm to 2 feet building to 2 to
4 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Patchy fog through
early afternoon. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves building 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 10 to 20 knots increasing to 15 to 25 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. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-030930-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
928 PM EDT Thu May 2 2024

.REST OF TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming southeast 5 to 15 knots
late. Patchy fog. Scattered rain showers and a slight chance of
thunderstorms. Waves calm to 2 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south late.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight, then veering southwest late. Waves
calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. 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. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 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. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-030930-
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-
928 PM EDT Thu May 2 2024

.REST OF TONIGHT...East winds 15 to 25 knots veering southeast
late. Patchy fog. Scattered rain showers and a slight chance of
thunderstorms. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing southeast late.
A slight chance of rain showers through early afternoon. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 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. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-030930-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
928 PM EDT Thu May 2 2024

.REST OF TONIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Scattered rain showers. A slight
chance of thunderstorms after midnight. Patchy fog after
midnight. Waves calm to 2 feet building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 10 to 20 knots veering west in the
afternoon, then becoming east 5 to 15 knots late. Patchy fog
through early afternoon. A chance of rain showers through early
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. A slight chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming south 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of rain showers. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 15 to 25 knots. Showers likely. Waves
building to 2 to 4 feet.

$$
LSZ261-030930-
MAFOR 0303/
Superior West 11236 11310 19316 11510 11520 13530 11510. Waves 2
to 4 feet overnight. Waves 2 to 4 feet building to 3 to 5 feet
Friday. Waves 3 to 5 feet subsiding to 2 to 4 feet Friday
evening.

Superior North Central 12220 19226 11420 14530 11420. Waves 2 to
4 feet overnight. Waves 3 to 5 feet Friday. Waves 2 to 4 feet
Friday evening.

Superior South Central 11220 19226 11320 11410 11620 11610 11500
12300. Waves 2 to 4 feet overnight. Waves 1 to 3 feet Friday and
Friday evening.

Superior East 11230 19236 12340 19346 11420 11510 11500 12300.
Waves 2 to 4 feet building to 3 to 5 feet overnight. Waves 3 to 6
feet subsiding to 1 to 3 feet Friday. Waves 1 to 2 feet Friday
evening.

$$

07

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weather.gov/mqt/glftable

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weather.gov/greatlakes