Great Lakes Forecast
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FZUS63 KMQT 220746
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
346 AM EDT Fri Mar 22 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 weak 30.2 inch inverted trough moves across Lake
Superior today. 30.4 inch ridging builds into the High Plains and
Lake Superior by Saturday morning. A deep low pressure near 29.1
inches ejects out of Rockies on Sunday. This low begins to weaken
to 29.5 inches as it moves towards the western Great Lakes on
Monday. Its expected to move into westenr or central Lake Superior
Tuesday or Tuesday evening.

LSZ162-221600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 AM EDT Fri Mar 22 2024 /246 AM CDT Fri Mar 22 2024/

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon. A slight chance of snow through early
afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight, then diminishing to 10 to 20 knots late. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to
3 feet.
.SATURDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. A slight chance of snow after midnight. Waves
calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots
by mid afternoon. A chance of snow through early afternoon, then
snow likely by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Snow. Waves building to 5 to 9 feet
occasionally to 11 feet.
.MONDAY...Northeast gales to 40 knots. Snow, rain. Waves building
to 9 to 12 feet occasionally to 15 feet, then subsiding to 6 to
9 feet occasionally to 11 feet.
.TUESDAY...Northeast winds 20 to 30 knots backing northwest. Rain
and snow likely, then a chance of snow, possibly mixed with rain.
Waves subsiding to 2 to 4 feet.

$$

LSZ263-221600-
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 AM EDT Fri Mar 22 2024

.EARLY THIS MORNING...North winds less than 10 knots. A slight
chance of snow. Waves calm to 2 feet.
.TODAY...North winds 5 to 15 knots backing northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of snow through early afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.SATURDAY...North winds 5 to 15 knots backing northwest in the
afternoon, then backing southwest late. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots by mid afternoon. A chance of snow. Waves building to
2 to 4 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots increasing to gales to
35 knots after midnight. Snow. Waves building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY...East gales to 35 knots. Snow, then rain. Waves building
to 10 to 14 feet occasionally to 18 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.TUESDAY...Northeast winds 20 to 30 knots becoming west 15 to
25 knots. Rain likely. A chance of rain. Waves subsiding to 3 to
5 feet occasionally to 7 feet.

$$

LSZ264-221600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 AM EDT Fri Mar 22 2024

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots veering northwest in the
afternoon. A slight chance of snow. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight. Freezing spray. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...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 by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 15 to 25 knots becoming east
gales to 35 knots after midnight. Snow. Waves building to 7 to
10 feet occasionally to 13 feet.
.MONDAY...East gales to 35 knots. Snow, rain. Waves building to
10 to 14 feet occasionally to 18 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.TUESDAY...East winds 20 to 30 knots becoming west 15 to
25 knots. Rain likely. A chance of rain. Waves subsiding to 3 to
5 feet occasionally to 7 feet.

$$

LSZ265-221600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 AM EDT Fri Mar 22 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. A slight chance
of snow. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow. Waves calm to
2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A slight chance of snow showers.
Freezing spray after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. A slight chance of snow showers
through early afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. A chance of snow by mid afternoon.
Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots. Snow. Waves
building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...East gales to 35 knots diminishing to 20 to 30 knots.
Snow, rain. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering west. Rain
likely, then a chance of rain, possibly mixed with snow. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ266-221600-
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 AM EDT Fri Mar 22 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Snow likely through early afternoon, then a chance of snow
by mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. A slight chance of snow showers. Freezing spray after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Freezing spray through early afternoon. A slight chance of
snow showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 15 to 25 knots increasing to
gales to 35 knots after midnight. Snow. Waves building to 7 to
10 feet occasionally to 13 feet.
.MONDAY...East gales to 35 knots veering southeast. Snow, then
rain. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering west. Rain
likely. A chance of rain. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-221600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 AM EDT Fri Mar 22 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots becoming northwest 15 to
25 knots late. Snow likely through early afternoon, then a chance
of snow by mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north late. A
slight chance of snow showers. Freezing spray after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 10 to 20 knots. A slight chance of snow
showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Snow. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY...East gales to 40 knots becoming southeast gales to
35 knots. Rain, possibly mixed with snow. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Southeast gales to 35 knots becoming west 20 to
30 knots. Rain, then a chance of rain. Waves subsiding to 2 to
4 feet.

$$

LSZ261-221600-
MAFOR 2209/
Superior West 11100 11800 11810 11710 13720 11820. Waves 2 feet
or less today. Waves 1 to 3 feet building to 3 to 5 feet tonight.

Superior North Central 11500 11600 12710 11720 11730 12830. A
chance of snow this morning. Waves 2 feet or less today. Waves
around 2 feet building to 3 to 6 feet tonight.

Superior South Central 11400 11500 11610 11710 13720 11831. A
chance of snow today. Waves 2 feet or less today. Waves 1 to 3
feet building to 4 to 6 feet tonight.

Superior East 11400 11417 11527 11620 13720 11830. Waves 1 to 3
feet today. Waves 2 to 4 feet building to 3 to 6 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


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