504
FZUS63 KMQT 241342
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 AM 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 29.9 inch high pressure ridge extending from
Ontario to Lower Michigan continues to drift east today,
and should be extending from Hudson Bay to the Lower Great Lakes
by the evening. Meanwhile, 29.4 inch low pressure currently
organizing over the Dakotas will lift northeast, reaching
southeast Manitoba tonight. An associated 29.6 inch trough will
sweep across Lake Superior during tonight and early Saturday
morning. In its wake, a 29.9 inch high pressure will build
northeast into the western Great Lakes region on Saturday. The
high will shift toward New England on Sunday as the next low
pressure of 29.4 inches lifts northeast to southern Wisconsin.
This low will deepen to 29.3 inches as it tracks to near the
Straits of Mackinac by Monday morning and then to near James Bay
by Tuesday morning. In its wake, 30.2 inch high pressure will
build over the Plains on Tuesday.



LSZ162-242145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 AM EDT Fri May 24 2024 /842 AM CDT Fri May 24 2024/

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

.REST OF TODAY...East gales to 35 knots. A chance of rain
showers. A slight chance of thunderstorms by mid afternoon. Waves
5 to 8 feet occasionally to 10 feet building to 9 to 12 feet
occasionally to 15 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, 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 rain showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of rain showers and a
slight chance of thunderstorms. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-242145-
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-
942 AM EDT Fri May 24 2024

.REST OF TODAY...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of rain showers and a slight
chance of thunderstorms by mid afternoon. Waves 3 to 5 feet
occasionally to 7 feet building to 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. Showers
likely through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves subsiding to 4 to 8 feet
occasionally to 10 feet.
.SATURDAY...Southwest winds 15 to 25 knots. Waves building to
5 to 8 feet occasionally to 10 feet, then subsiding to 2 to
4 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves subsiding to calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-242145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 AM EDT Fri May 24 2024

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon. A slight chance of rain showers by mid
afternoon. Waves calm to 2 feet building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...East winds 20 to 30 knots becoming southeast 15 to
25 knots after midnight, then veering south late. Showers and a
slight chance of thunderstorms. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots late. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves building to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.

$$

LSZ265-242145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 AM EDT Fri May 24 2024

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A slight chance of rain showers by mid afternoon. Waves
calm to 2 feet building to 2 to 4 feet.
.TONIGHT...East winds 15 to 25 knots veering southeast after
midnight, then veering southwest late. Showers 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. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers through midnight. Showers
likely after midnight. Waves building to 1 to 3 feet.
.MONDAY...Northwest winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ266-242145-
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-
942 AM EDT Fri May 24 2024

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

$$

LSZ267-242145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 AM EDT Fri May 24 2024

.REST OF TODAY...Northeast winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 20 to
30 knots after midnight. 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...South winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then backing southeast late. A chance
of rain 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. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots. A chance of showers
through midnight, then showers likely after midnight. Waves
building to 1 to 3 feet.
.MONDAY...North winds 15 to 25 knots backing northwest. Showers
likely, then a chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 2 to 4 feet.

$$
LSZ261-242145-
MAFOR 2415/
Superior West...GALE WARNING IN EFFECT...12250 11256 11246 11330
13530. A chance of thunderstorms this evening. Waves 4 to 7 feet
building to 9 to 12 feet this afternoon. Waves 9 to 12 feet
subsiding to 4 to 7 feet tonight. Waves 4 to 7 feet Saturday
morning.

Superior North Central 12220 11230 11240 12346 11430 11530. Waves
1 to 3 feet building to 2 to 4 feet this afternoon. Waves 2 to 4
feet building to 5 to 9 feet tonight. Waves 5 to 8 feet Saturday
morning.

Superior South Central 11210 12220 11230 12336 11520 11620. Waves
1 to 3 feet this afternoon. Waves 3 to 6 feet tonight. Waves 3 to
5 feet subsiding to 2 to 4 feet Saturday morning.

Superior East 11200 12210 11220 11230 12336 11520. Waves 1 to 2
feet this afternoon. Waves 1 to 3 feet building to 4 to 7 feet
tonight. Waves 4 to 7 feet subsiding to 3 to 5 feet Saturday
morning.

$$

LC

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

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