875
FZUS63 KMQT 291959
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM EDT Mon Apr 29 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 30.6 inch high pressure over Hudson Bay is shifting
northeast into Quebec this evening. Meanwhile, a 29.7 inch low
pressure over Wisconsin will track northeast, crossing western
Lake Superior tonight and exiting into Ontario Tuesday morning as
it weakens to 29.8 inches. During Tuesday afternoon and evening,
a weak high pressure ridge of 29.9 inches will shift east across
Lake Superior while a low pressure trough of 29.6 inches moves
from the western Plains to Minnesota and Iowa. This trough will
weaken to 29.7 inches as it sails across Lake Superior on
Wednesday. As a 30.0 inch ridge then shifts east across the
western Great Lakes during Wednesday night, a 29.3 inch Colorado
Low will lift out over the Plains while weakening to 29.5 inches.
This low will then track to the Upper Mississippi Valley on
Thursday and into northwestern Ontario on Friday. As the low
reaches the Hudson Bay shores Saturday afternoon at 29.6 inches,
a ridge of 30.1 inches builds over Lake Huron.

LSZ162-300400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
359 PM EDT Mon Apr 29 2024 /259 PM CDT Mon Apr 29 2024/

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots. Patchy
fog. Numerous rain showers. Waves 8 to 11 feet occasionally to 14
feet subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 10 to
20 knots after midnight, then backing west late. Patchy fog
through midnight. A chance of rain showers. Waves subsiding to
2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 15 to
25 knots after midnight, then becoming northeast 10 to 20 knots
late. A chance of rain showers through midnight, then rain
showers after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of drizzle through early
afternoon. A chance of rain showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.THURSDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of drizzle. A
chance of rain showers. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of rain showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.

$$

LSZ263-300400-
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-
359 PM EDT Mon Apr 29 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Patchy fog.
Numerous rain showers. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...East winds 15 to 25 knots becoming west 10 to 20 knots
after midnight. Patchy fog through midnight. Areas of fog after
midnight. A chance of rain showers. Waves subsiding to 2 to 4
feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southwest late. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of rain showers through
midnight, then rain showers after midnight. Waves building to
2 to 4 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of rain showers
through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of drizzle. A
chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ264-300400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
359 PM EDT Mon Apr 29 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Patchy fog.
Numerous rain showers. Waves 7 to 10 feet occasionally to
13 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering southwest late. Patchy fog
through midnight. Areas of fog after midnight. A chance of rain
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. Areas of fog through early afternoon. A slight
chance of rain showers and drizzle through early afternoon. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds less than 10 knots becoming east
5 to 15 knots after midnight, then becoming southeast 15 to
25 knots late. A chance of rain showers after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots veering west by mid
afternoon. A chance of rain showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of drizzle. A
chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots. A chance of rain
showers. Waves 2 to 4 feet.

$$

LSZ265-300400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
359 PM EDT Mon Apr 29 2024

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Patchy fog.
Scattered rain showers. Waves 5 to 8 feet occasionally to
10 feet.
.TONIGHT...East winds 15 to 25 knots becoming south 5 to 15 knots
after midnight, then becoming west 10 to 20 knots late. Areas of
fog. A chance of rain showers. Waves subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Areas of fog through early afternoon. A slight chance of
drizzle through early afternoon. Waves building to 2 to 4 feet,
then subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
15 to 25 knots. Rain showers likely after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots. Showers likely and a
chance of thunderstorms. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of drizzle. A chance of showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ266-300400-
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-
359 PM EDT Mon Apr 29 2024

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Patchy fog.
Scattered rain showers. Waves 5 to 9 feet occasionally to
11 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight, then veering southwest late. Patchy fog
through midnight. Areas of fog after midnight. A chance of rain
showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Patchy fog through early afternoon. A slight chance of
drizzle through early afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. A chance of
rain showers after midnight. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots. Showers likely and a
chance of thunderstorms. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. A chance
of drizzle. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ267-300400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
359 PM EDT Mon Apr 29 2024

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Patchy fog.
Scattered rain showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight, then veering south late. Patchy fog
through midnight. Areas of fog after midnight. A chance of rain
showers. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Patchy fog through early afternoon. A slight chance of rain
showers through early afternoon. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight, then increasing to 10 to 20 knots late. A chance
of rain showers after midnight. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering southwest by
mid afternoon. A chance of rain showers. Waves subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots becoming southeast
20 to 30 knots after midnight. Showers likely and a chance of
thunderstorms. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. A chance
of drizzle. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ261-300400-
MAFOR 2921/
Superior West 11146 11130 11824 11714 11610 11620 11610 11510.
Waves 8 to 11 feet subsiding to 2 to 5 feet tonight and Tuesday.

Superior North Central 12246 11236 11324 11524 11624 11720 11620.
Waves 6 to 10 feet subsiding to 5 to 8 feet tonight. Waves 2 to 5
feet Tuesday.

Superior South Central 11230 19236 11220 11314 11414 11620 11630
19634 12620. Waves 5 to 8 feet subsiding to 1 to 4 feet tonight
and Tuesday.

Superior East 11230 19236 11230 11336 11324 11414 11510 12620.
Waves 4 to 7 feet subsiding to 1 to 4 feet tonight and Tuesday.

$$

GS

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

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