Great Lakes Forecast
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FZUS63 KMQT 160750
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 AM EDT Sat Mar 16 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 29.4 inch low pressure system across central Ontario
will move east and be between southern James Bay and northeast
Lake Superior by this evening as 30.5 inch high pressure moves
into northern Saskatchewan. As this low continues to move away,
30.5 inch high pressure will build south to Lake Winnipeg by
Sunday evening before shifting south over the central and southern Plains
on Monday. Across Lake Superior, ridging builds to 30.1 inches
Sunday night before gradually weakening to 29.9 inches by Monday
evening. Ridging is quickly followed by a 29.6 inch low pressure
that tracks southeast across Lake Superior Monday night into
Tuesday. In its wake, ridging builds to at least 30.2 inches
across the lake on Wednesday.

LSZ162-161600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 AM EDT Sat Mar 16 2024 /250 AM CDT Sat Mar 16 2024/

...GALE WARNING IN EFFECT THROUGH SUNDAY MORNING...

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...West winds 20 to 30 knots becoming northwest gales to
35 knots in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Northwest gales to 35 knots. Scattered snow showers.
Freezing spray after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. Freezing spray through early afternoon.
Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Isolated snow showers. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.MONDAY...Northwest winds 15 to 25 knots backing west by mid
afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.TUESDAY...Northwest winds 15 to 25 knots veering north. Waves
building to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-161600-
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-
350 AM EDT Sat Mar 16 2024

...GALE WARNING IN EFFECT THROUGH SUNDAY AFTERNOON...

.EARLY THIS MORNING...West winds 20 to 30 knots. Scattered rain
showers. Waves 4 to 8 feet occasionally to 10 feet.
.TODAY...West winds 20 to 30 knots veering northwest late.
Isolated snow showers by mid afternoon. Waves building to 6 to
9 feet occasionally to 11 feet.
.TONIGHT...Northwest gales to 35 knots veering north late.
Scattered snow showers. Freezing spray after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
late. Freezing spray. Scattered snow showers. Waves subsiding to
4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots. Scattered snow
showers. Freezing spray after midnight. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. A chance of snow showers. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots veering north. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-161600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 AM EDT Sat Mar 16 2024

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...

.EARLY THIS MORNING...West gales to 35 knots. Isolated rain
showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...West winds 20 to 30 knots becoming northwest gales to
35 knots late. Isolated rain and snow showers. Waves subsiding to
4 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest gales to 40 knots veering north after
midnight. Scattered snow showers. Freezing spray after midnight.
Waves building to 9 to 12 feet occasionally to 15 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Snow showers
through early afternoon. Scattered snow showers by mid afternoon.
Waves 9 to 12 feet occasionally to 15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Isolated snow showers.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Freezing spray through early afternoon. Waves
subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. A chance of snow showers. Waves 1 to 3 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 20 to
30 knots. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming north 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-161600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 AM EDT Sat Mar 16 2024

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH LATE
SUNDAY NIGHT...

.EARLY THIS MORNING...West winds 20 to 30 knots. Isolated rain
showers. Waves 3 to 5 feet occasionally to 7 feet subsiding to
2 to 4 feet.
.TODAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Isolated rain showers through early
afternoon. Scattered snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Northwest gales to 40 knots. Scattered snow showers
through midnight, then numerous snow showers after midnight.
Freezing spray after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SUNDAY...Northwest gales to 35 knots veering north late.
Freezing spray. Snow showers through early afternoon. Scattered
snow showers by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Scattered snow showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. Scattered snow showers. Waves subsiding to 2 to
4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ266-161600-
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-
350 AM EDT Sat Mar 16 2024

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH LATE
SUNDAY NIGHT...

.EARLY THIS MORNING...Southwest gales to 35 knots. Scattered rain
showers, possibly mixed with snow. Waves 5 to 8 feet occasionally
to 10 feet.
.TODAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Scattered snow showers, possibly mixed
with rain. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 8 to 11 feet occasionally to 14 feet.
.TONIGHT...Northwest gales to 40 knots. Scattered snow showers
through midnight, then numerous snow showers after midnight.
Freezing spray after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Snow showers
through early afternoon. Scattered snow showers by mid afternoon.
Waves 10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Scattered snow showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. Scattered snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots backing southwest
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming north 15 to
25 knots. A chance of snow showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 2 to 4 feet.

$$

LSZ267-161600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 AM EDT Sat Mar 16 2024

...GALE WARNING IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH LATE
SUNDAY NIGHT...

.EARLY THIS MORNING...Southwest gales to 35 knots. Scattered rain
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then increasing to gales to 40 knots
late. Scattered rain showers, possibly mixed with snow. Waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
8 to 11 feet occasionally to 14 feet.
.TONIGHT...Northwest gales to 40 knots. Scattered snow showers
through midnight, then numerous snow showers after midnight.
Waves building to 10 to 14 feet occasionally to 18 feet.
.SUNDAY...Northwest gales to 40 knots becoming north gales to
35 knots late. Freezing spray through early afternoon. Numerous
snow showers through early afternoon, then scattered snow showers
by mid afternoon. Waves subsiding to 9 to 12 feet occasionally to
15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Scattered snow showers. Freezing spray
after midnight. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.MONDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Freezing spray through early afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming north 15 to
25 knots. Waves subsiding to 2 to 4 feet.

$$

LSZ261-161600-
MAFOR 1609/
Superior West...GALE WARNING IN EFFECT...12640 13740 11750 11740
19747 11741 19747. Waves 4 to 7 feet subsiding to 3 to 6 feet,
then building to 5 to 8 feet today. Waves 5 to 8 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...11650 12640
11740 11750 11750 19757 11751 19757 11857. Waves 5 to 8 feet
today. Waves 6 to 9 feet building to 8 to 12 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...11540 11640
11650 12650 19657 11750 19757 12757. Waves 2 to 4 feet building
to 5 to 8 feet today. Waves 6 to 9 feet building to 10 to 13 feet
tonight.

Superior East...GALE WARNING IN EFFECT...11546 11540 19547 11640
19647 11640 11650 19657 12750 19757 11757. Waves 4 to 7 feet
subsiding to 3 to 5 feet, then building to 7 to 10 feet today.
Waves 8 to 11 feet building to 10 to 14 feet tonight.

$$

07

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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