769
FZUS63 KMQT 200757
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM EDT Sun Apr 20 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...High pressure will strengthen to 30.5 inches this
morning but will give way to 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.

LSZ162-201600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EDT Sun Apr 20 2025 /257 AM CDT Sun Apr 20 2025/

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots veering east after
midnight, then becoming northeast 15 to 25 knots late. A slight
chance of rain through midnight, then rain, possibly mixed with
snow after midnight. Waves building to 2 to 4 feet.
.MONDAY...Northeast winds 20 to 30 knots backing north in the
afternoon, then diminishing to 10 to 20 knots late. Rain and
snow. 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 northwest
5 to 15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ263-201600-
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-
357 AM EDT Sun Apr 20 2025

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon.
Waves building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then increasing to 15 to 25 knots late. A chance
of rain through midnight, then rain, possibly mixed with snow
after midnight. Waves 1 to 3 feet.
.MONDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots late. Rain and snow. 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. A slight chance of rain showers,
possibly mixed with snow through midnight. Waves subsiding to
1 to 3 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...Northeast winds 5 to 15 knots backing north. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ264-201600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EDT Sun Apr 20 2025

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming east 10 to 20 knots late.
Rain, possibly mixed with snow after midnight. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...East winds 15 to 25 knots becoming northeast 20 to
30 knots in the afternoon, then becoming north 15 to 25 knots
late. Rain and snow. Waves building to 4 to 8 feet occasionally
to 10 feet.
.MONDAY NIGHT...North winds 15 to 25 knots. A chance of rain
showers, possibly mixed with snow through 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...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.

$$

LSZ265-201600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EDT Sun Apr 20 2025

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...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.
.TONIGHT...Southeast winds 10 to 20 knots becoming east 15 to
25 knots late. A chance of rain through midnight, then rain,
possibly mixed with snow after midnight. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.MONDAY...East winds 20 to 30 knots backing north late. A slight
chance of snow through early afternoon. Rain. Snow by mid
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of rain and snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North 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 southwest.
Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots backing north. A chance of
rain showers. Waves calm to 2 feet.

$$

LSZ266-201600-
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-
357 AM EDT Sun Apr 20 2025

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...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.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then becoming east 15 to 25 knots late. A slight chance
of rain through midnight, then rain, possibly mixed with snow and
sleet after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY...East winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon, then becoming northeast 20 to 30 knots late.
Rain, possibly mixed with snow. Waves building to 4 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots backing northwest
after midnight. A chance of rain and snow showers. Waves 4 to
7 feet occasionally to 9 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 southwest.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ267-201600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EDT Sun Apr 20 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming east 20 to 30 knots late.
A slight chance of rain through midnight, then rain, possibly
mixed with sleet after midnight. Waves building to 2 to 4 feet.
.MONDAY...East winds 20 to 30 knots diminishing to 15 to 25 knots
late. Rain. 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. Rain showers likely through
midnight. A chance of snow showers. A chance of rain showers
after midnight. Waves building to 4 to 7 feet occasionally to
9 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. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ261-201600-
MAFOR 2009/
Superior West 13300 13210 12220. A chance of rain overnight.
Waves 2 feet or less today. Waves 1 to 3 feet building to 2 to 4
feet tonight.

Superior North Central 12400 12310 14320. A chance of rain
overnight. Waves 2 feet or less today. Waves 2 to 4 feet tonight.

Superior South Central 11400 11410 11310 11320 12220 11310 11326.
Waves 1 to 3 feet today. Waves 2 to 4 feet tonight.

Superior East 11500 11400 11300 12210 11220 12320. A chance of
rain overnight. Waves 1 to 2 feet today. Waves 1 to 3 feet
building to 2 to 4 feet tonight.

$$

WFO MQT

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

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