838
FZUS63 KMQT 200131
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
931 PM EDT Sat Apr 19 2025

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...30.2 inch high pressure moving over the Great Lakes
this evening will strengthen to 30.5 inches by Sunday morning and
will give way to a low pressure lifting into the Upper Great Lakes
at around 29.5 inches by Monday morning. Behind the low, weak
ridging of around 30.1 inches moves back over Lake Superior on
Tuesday into Wednesday. This will be followed up by weak low
pressure of around 29.9 inches moving towards the Great Lakes
Thursday, though there is uncertainty in the track and strength of
this next system.




LSZ162-200945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
931 PM EDT Sat Apr 19 2025 /831 PM CDT Sat Apr 19 2025/

.REST OF TONIGHT...South winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots late. A chance of rain showers. Waves building to
2 to 4 feet.
.MONDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Rain showers, possibly mixed with snow through early
afternoon, then a chance of rain showers, possibly mixed with
snow by mid afternoon. Waves building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ263-200945-
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-
931 PM EDT Sat Apr 19 2025

.REST OF TONIGHT...South winds less than 10 knots increasing to
5 to 15 knots late. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east in the
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of rain showers. A slight chance of snow
showers after midnight. Waves building to 2 to 4 feet.
.MONDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Rain and snow showers through early afternoon, then a
chance of rain showers, possibly mixed with snow and sleet by mid
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of rain showers. Waves building to 1 to
3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.

$$

LSZ264-200945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
931 PM EDT Sat Apr 19 2025

.REST OF TONIGHT...Southwest winds less than 10 knots becoming
south 5 to 15 knots late. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. A chance of rain showers. A slight chance of snow
showers after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Rain showers, possibly mixed with snow. A slight
chance of sleet by mid afternoon. Waves building to 4 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of rain showers. Waves building to 1 to
3 feet.
.WEDNESDAY...South winds 5 to 15 knots veering west. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.

$$

LSZ265-200945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
931 PM EDT Sat Apr 19 2025

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then becoming east 15 to 25 knots
late. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming east
15 to 25 knots late. A chance of rain showers through midnight,
then rain showers after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.MONDAY...East winds 20 to 30 knots becoming north 15 to 25 knots
by mid afternoon. Rain showers, possibly mixed with snow. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering west. Waves
calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ266-200945-
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-
931 PM EDT Sat Apr 19 2025

.REST OF TONIGHT...Northwest winds 5 to 15 knots backing south
late. Waves 1 to 3 feet subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. Waves building
to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming east
15 to 25 knots late. A slight chance of rain showers through
midnight, then rain showers after midnight. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...East winds 20 to 30 knots backing north by mid
afternoon. Rain showers, possibly mixed with snow. Waves building
to 4 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. A chance of rain showers through
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. A chance of rain showers. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ267-200945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
931 PM EDT Sat Apr 19 2025

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

$$
LSZ261-200945-
MAFOR 2003/
Superior West 14300 11300 13210. Waves 2 feet or less overnight
and Sunday. Waves 1 to 3 feet Sunday evening.

Superior North Central 12500 11400 11410 13310 11320. Waves 2
feet or less overnight and Sunday. Waves 2 to 4 feet Sunday
evening.

Superior South Central 11500 12400 11410 12310 11220 11320. Waves
2 feet or less overnight. Waves 1 to 3 feet Sunday. Waves 2 to 4
feet Sunday evening.

Superior East 11710 11700 11600 12400 11310 11210 11310. Waves 2
to 4 feet subsiding to 1 to 2 feet overnight. Waves 1 to 3 feet
Sunday and Sunday evening.

$$

LC

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

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