513
FZUS63 KMQT 241946
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
346 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 currently over Grand Forks,
North Dakota is continuing to lift northeast this afternoon,
reaching southeastern Manitoba by this evening. Meanwhile, an
associated 29.6 inch trough sweeps across Lake Superior this
afternoon through 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 New England on Sunday as
the next low pressure of around 29.4 inches lifts northeast to
southern Wisconsin. This low deepens to 29.3 inches as it tracks
to near the Straits of Mackinac by Monday morning and then to
around James Bay 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.

LSZ162-250400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 PM EDT Fri May 24 2024 /246 PM CDT Fri May 24 2024/

...GALE WARNING IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS
EVENING...

.LATE THIS AFTERNOON...East gales to 35 knots. Rain showers and
scattered thunderstorms. Waves 10 to 14 feet occasionally to
18 feet.
.TONIGHT...East winds 20 to 30 knots becoming southwest 15 to
25 knots after midnight. A chance of showers and thunderstorms
through midnight. Waves subsiding to 3 to 6 feet occasionally to
8 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 building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 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.

$$

LSZ263-250400-
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-
346 PM EDT Fri May 24 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Scattered rain
showers and isolated thunderstorms. Waves 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...East winds 20 to 30 knots veering southeast after
midnight, then becoming southwest 15 to 25 knots late. Rain
showers likely through midnight. A chance of thunderstorms. A
chance of rain showers after midnight. Waves subsiding to 4 to
8 feet occasionally to 10 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet, then 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.

$$

LSZ264-250400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 PM EDT Fri May 24 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Scattered rain
showers and isolated thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...East winds 20 to 30 knots veering southeast after
midnight, then becoming southwest 15 to 25 knots late. Rain
showers likely and a slight chance of thunderstorms. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of rain showers by mid afternoon.
Waves building to 5 to 8 feet occasionally to 10 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.

$$

LSZ265-250400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 PM EDT Fri May 24 2024

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Scattered
showers. Waves 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Showers likely
and a slight chance of thunderstorms. Waves building to 3 to
6 feet occasionally to 8 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.

$$

LSZ266-250400-
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-
346 PM EDT Fri May 24 2024

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Isolated rain
showers. Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A chance of rain showers through midnight. A slight chance of
thunderstorms. Rain showers after midnight. Waves building to
4 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 15 to 25 knots backing southwest in the
afternoon, then becoming southeast 10 to 20 knots late. A chance
of showers through early afternoon. 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.

$$

LSZ267-250400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 PM EDT Fri May 24 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A chance of showers through midnight, then showers and a slight
chance of thunderstorms after midnight. Waves building 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 backing southeast late. A chance
of 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.

$$

LSZ261-250400-
MAFOR 2421/
Superior West...GALE WARNING IN EFFECT...11256 19259 11246 11330
14530 11530. Waves 8 to 12 feet subsiding to 5 to 8 feet tonight.
Waves 4 to 7 feet subsiding to 3 to 6 feet Saturday.

Superior North Central 11240 19246 11246 12346 11530 12540 11530.
Waves 2 to 4 feet building to 5 to 9 feet tonight. Waves 5 to 8
feet Saturday.

Superior South Central 11230 19236 11230 12336 11520 12620 11410.
Waves 2 to 4 feet building to 3 to 6 feet tonight. Waves 3 to 5
feet subsiding to 1 to 3 feet Saturday.

Superior East 12220 11230 11346 11336 11520 11620 11510. Waves 1
to 3 feet building to 4 to 7 feet tonight. Waves 4 to 7 feet
subsiding to 2 to 4 feet Saturday.

$$

TAP

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

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