245
FZUS63 KMQT 250144
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
944 PM EDT Fri May 24 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 29.3 inch low pressure over southeastern Manitoba is
bringing an associated 29.6 inch trough over western Lake Superior
early this evening. This trough continues across the rest of the
lake tonight into Saturday morning. In its wake, a 29.9 inch high
pressure builds northeast into the western Great Lakes region on
Saturday. The high then shifts toward the mouth of the St.
Lawrence River on Sunday as the next low pressure of around 29.4
inches lifts northeast into southern Wisconsin. This low deepens
to 29.3 inches as it tracks the Straits of Mackinac by Monday
morning and then into northern Quebec by Tuesday morning. In its
wake, a 30.2 inch high pressure builds over the Northern Plains on
Tuesday. This high pressure continues building to 30.3 inches by
Wednesday as it shifts into the Upper Great Lakes.

LSZ162-250945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 PM EDT Fri May 24 2024 /844 PM CDT Fri May 24 2024/

.REST OF TONIGHT...East winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. Scattered rain showers and a chance of thunderstorms by
late evening. Waves 7 to 10 feet occasionally to 13 feet
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing northeast late. A
chance of rain showers and a slight chance of thunderstorms.
Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. A chance of showers. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ263-250945-
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-
944 PM EDT Fri May 24 2024

.REST OF TONIGHT...East winds 20 to 30 knots becoming southeast
15 to 25 knots after midnight, then becoming southwest 20 to
30 knots late. Numerous rain showers by late evening. A chance of
thunderstorms. Scattered rain showers after midnight. Waves 5 to
8 feet occasionally to 10 feet subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight, then backing south late. A chance of rain showers
and a slight chance of thunderstorms. Waves subsiding to calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of rain showers by mid afternoon. Waves
building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. A chance of showers. Waves 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ264-250945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
944 PM EDT Fri May 24 2024

.REST OF TONIGHT...East winds 20 to 30 knots veering southeast
after midnight, then veering southwest late. Numerous rain
showers by late evening. A chance of thunderstorms. Scattered
rain showers after midnight. Waves 3 to 6 feet occasionally to
8 feet building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of rain showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. A chance of rain
showers and a slight chance of thunderstorms. Waves subsiding to
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of rain showers by mid afternoon. Waves calm
to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming north 10 to
20 knots after midnight. A chance of showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.MONDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of showers. Waves 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ265-250945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
944 PM EDT Fri May 24 2024

.REST OF TONIGHT...East winds 15 to 25 knots veering southeast
after midnight, then becoming west 10 to 20 knots late. Numerous
showers and a chance of thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest in the
afternoon, then backing southeast late. A slight chance of
showers by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots backing north
after midnight. Showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Northwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-250945-
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-
944 PM EDT Fri May 24 2024

.REST OF TONIGHT...East winds 15 to 25 knots becoming southeast
20 to 30 knots after midnight. Rain showers and a chance of
thunderstorms. Waves 3 to 5 feet occasionally to 7 feet building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.SATURDAY...West winds 15 to 25 knots backing southwest in the
afternoon, then becoming southeast 10 to 20 knots late. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. A slight
chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots backing northeast after
midnight. Showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves 3 to 6 feet occasionally to
8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-250945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
944 PM EDT Fri May 24 2024

.REST OF TONIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Numerous showers. A slight chance
of thunderstorms after midnight. Waves 1 to 3 feet building to
5 to 8 feet occasionally to 10 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming east 5 to 15 knots late.
Scattered showers and a slight chance of thunderstorms through
early afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A slight chance of showers. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots backing northeast after
midnight. A chance of showers through midnight. Showers likely
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Showers likely through early afternoon. A chance of
showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.

$$
LSZ261-250945-
MAFOR 2503/
Superior West 11330 19336 14540 11530 11520 11410. Waves 5 to 9
feet subsiding to 4 to 6 feet overnight. Waves 4 to 7 feet
subsiding to 3 to 6 feet Saturday. Waves 2 to 4 feet Saturday
evening.

Superior North Central 12346 11540 19546 12540 11530 11420 11410.
Waves 5 to 8 feet overnight. Waves 5 to 9 feet subsiding to 4 to
7 feet Saturday. Waves 3 to 5 feet Saturday evening.

Superior South Central 12336 11620 19626 11620 11520 13310. A
chance of thunderstorms overnight. Waves 3 to 6 feet overnight.
Waves 2 to 4 feet subsiding to 1 to 3 feet Saturday. Waves 1 to 2
feet Saturday evening.

Superior East 11336 12346 11520 19526 11610 11410 12300. Waves 2
to 3 feet building to 5 to 8 feet overnight. Waves 4 to 7 feet
subsiding to 1 to 3 feet Saturday. Waves 1 to 3 feet Saturday
evening.

$$

TAP

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

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