Great Lakes Forecast
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FZUS63 KMQT 221953
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
353 PM 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... 30.4 inch ridging builds into the Upper Great Lakes
tonight through Saturday. A deep low pressure near 29.0 inches
ejects out of the Rockies on Sunday. This low begins to weaken to
29.4 inches as it moves towards the western Great Lakes on Monday.
Its expected to move into west-central Lake Superior Tuesday
evening as it continues to weaken to 29.5 inches before lifting
into northern Ontario Wednesday. 29.9 inch high pressure builds
into the Midwest in its wake Wednesday into Thursday.

LSZ162-230400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
353 PM EDT Fri Mar 22 2024 /253 PM CDT Fri Mar 22 2024/

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. 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 northwest 5 to
15 knots in the afternoon, then becoming southwest 10 to 20 knots
late. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. A slight chance of snow showers 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. Snow. Waves building
to 5 to 9 feet occasionally to 11 feet.
.MONDAY...East gales to 40 knots backing northeast by mid
afternoon. Snow. Waves building to 12 to 17 feet occasionally to
21 feet.
.MONDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots after midnight. Snow through midnight. Rain. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northeast winds 20 to 30 knots backing northwest.
Rain. A chance of snow. A chance of rain showers. Waves subsiding
to 2 to 4 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ263-230400-
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-
353 PM EDT Fri Mar 22 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 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 6 to 9 feet
occasionally to 11 feet.
.MONDAY...East gales to 40 knots. Snow. Rain by mid afternoon.
Waves building to 10 to 14 feet occasionally to 18 feet.
.MONDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Rain. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northeast winds 15 to 25 knots backing west. Rain. A
chance of snow. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ264-230400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
353 PM EDT Fri Mar 22 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight. Freezing spray 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 becoming west less than 10 knots late. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
late. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A slight chance of snow 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 6 to
9 feet occasionally to 11 feet.
.MONDAY...East gales to 35 knots. Snow. Waves building to 10 to
14 feet occasionally to 18 feet.
.MONDAY NIGHT...East gales to 35 knots diminishing to 15 to
25 knots after midnight. Snow through midnight. Rain. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...East winds 15 to 25 knots veering west. Rain. A chance
of snow. A chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ265-230400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
353 PM EDT Fri Mar 22 2024

.LATE THIS AFTERNOON...North winds 10 to 20 knots. 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 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 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 increasing to 10 to
20 knots late. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 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 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow. Waves building to 4 to
7 feet occasionally to 9 feet.
.MONDAY...East winds 20 to 30 knots with gale force gusts to 35
knots diminishing to 20 to 30 knots by mid afternoon. Snow. Rain
by mid afternoon. Waves building to 6 to 10 feet occasionally to
13 feet.

.MONDAY NIGHT...East winds 20 to 30 knots veering southeast after
midnight. Rain. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering west. Rain,
then a chance of rain showers, possibly mixed with snow. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...West winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-230400-
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-
353 PM EDT Fri Mar 22 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. A slight
chance of snow showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. A chance of snow showers. Freezing spray after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming northwest 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 late.
Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. A slight chance of snow by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow. Waves building to 5 to
8 feet occasionally to 10 feet.
.MONDAY...East gales to 35 knots. Snow. Rain by mid afternoon.
Waves building to 9 to 12 feet occasionally to 15 feet.
.MONDAY NIGHT...East gales to 35 knots becoming southeast 20 to
30 knots after midnight. Rain. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering west. Rain,
then a chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots. A chance of rain showers.
A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-230400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
353 PM EDT Fri Mar 22 2024

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY
NIGHT...

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. A slight
chance of snow showers. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. A slight chance of snow showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots backing northwest late. A
slight chance of snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight, then backing south late. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Snow. Waves building to 5 to
8 feet occasionally to 10 feet.
.MONDAY...East gales to 40 knots becoming southeast gales to
35 knots by mid afternoon. Snow likely. Rain likely by mid
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.MONDAY NIGHT...Southeast gales to 35 knots. Rain. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering south. Rain.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 20 to 30 knots. A chance of rain showers.
A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-230400-
MAFOR 2221/
Superior West 11720 12730 12820 11810 11700 11610. Waves 1 to 3
feet building to 3 to 5 feet tonight, then subsiding to 1 to 3
feet subsiding to 1 foot or less Saturday.

Superior North Central 11720 11730 11830 13820 11810 11700. Waves
1 to 3 feet building to 3 to 5 feet tonight, subsiding to 1 to 3
feet Saturday.

Superior South Central 11820 12720 11821 12820 12810. A chance of
snow showers overnight. Waves 1 to 3 feet building to 3 to 5 feet
tonight, subsiding to 1 to 3 feet Saturday.

Superior East 11720 11730 12830 12820 12810. A chance of snow
showers Saturday morning. Waves 2 to 5 feet tonight and Saturday.


$$

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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