Great Lakes Forecast
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FZUS63 KMQT 170146
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
946 PM 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 29.3 inch low pressure system across northern
Ontario continues east tonight, moving over Quebec Sunday morning
and the Gulf of St Lawrence Monday morning. Meanwhile, a 30.6
inch high pressure develops over northern Saskatchewan tonight
then shifts south across the Plains on Sunday and Monday. Across
Lake Superior, ridging builds to around 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 as a 30.7 inch high develops near the Northwest
Territories. This high pressure tracks southeast toward Lake
Superior on Thursday allowing ridging over Lake Superior to build
to 30.4 inches.

LSZ162-171000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
946 PM EDT Sat Mar 16 2024 /846 PM CDT Sat Mar 16 2024/

.REST OF TONIGHT...Northwest winds 20 to 30 knots with a few gale
force gusts to 35 knots possible. Scattered snow showers.
Freezing spray after midnight. Waves 4 to 8 feet occasionally to
10 feet.
.SUNDAY...North winds 20 to 30 knots with a few gale force gusts
to 35 knots possible. Freezing spray through early afternoon.
Isolated snow showers. Waves subsiding to 3 to 6 feet occasionally
to 8 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 becoming west 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of snow showers.
Waves building to 2 to 4 feet.

$$

LSZ263-171000-
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-
946 PM EDT Sat Mar 16 2024

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

.REST OF TONIGHT...Northwest gales to 35 knots veering north
late. Scattered snow showers. Freezing spray after midnight. Waves
5 to 9 feet occasionally to 11 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
late. Freezing spray. Scattered snow showers. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. Freezing spray. Scattered snow showers. Waves
building to 8 to 11 feet occasionally to 14 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...Southwest winds 10 to 20 knots diminishing to
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 increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding 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 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming east 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ264-171000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
946 PM EDT Sat Mar 16 2024

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

.REST OF TONIGHT...Northwest gales to 35 knots veering north
late. Scattered snow showers. Freezing spray after midnight.
Waves 7 to 10 feet occasionally to 13 feet building to 10 to
14 feet occasionally to 18 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Scattered snow
showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. 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.
Isolated snow showers 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 increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Freezing spray after midnight. Waves building to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming north 10 to
20 knots. Heavy freezing spray. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming east 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-171000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
946 PM EDT Sat Mar 16 2024

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

.REST OF TONIGHT...Northwest gales to 35 knots. Scattered snow
showers. Freezing spray after midnight. Waves 5 to 8 feet
occasionally to 10 feet building to 8 to 11 feet occasionally to
14 feet.
.SUNDAY...Northwest gales to 35 knots veering north late.
Freezing spray. Numerous snow showers. Waves building to 9 to
12 feet occasionally to 15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. Freezing spray. Scattered snow showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Freezing spray through early
afternoon. Isolated snow showers through early afternoon. Waves
subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots. Freezing spray
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering east. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

$$

LSZ266-171000-
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-
946 PM EDT Sat Mar 16 2024

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

.REST OF TONIGHT...Northwest gales to 40 knots. Scattered snow
showers. Freezing spray after midnight. Waves 9 to 12 feet
occasionally to 15 feet building to 10 to 14 feet occasionally to
18 feet.
.SUNDAY...North gales to 40 knots. Freezing spray. Numerous snow
showers. Waves 10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. 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. Isolated snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots by mid afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots. A chance of snow
showers. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming north 15 to
25 knots. Freezing spray. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots veering east. A chance
of snow showers. Waves subsiding to 1 to 3 feet.

$$

LSZ267-171000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
946 PM EDT Sat Mar 16 2024

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

.REST OF TONIGHT...Northwest gales to 40 knots. Scattered snow
showers. Waves 9 to 12 feet occasionally to 15 feet 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. Scattered
snow showers. Waves subsiding to 9 to 12 feet occasionally to
15 feet.
.SUNDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots late. Scattered snow showers. Freezing spray after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Freezing spray. Isolated 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...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots increasing to
gales to 35 knots after midnight. A chance of snow showers.
Freezing spray after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming north 15 to
25 knots. Freezing spray. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots veering east. A chance of
snow showers. Waves subsiding to 1 to 3 feet.

$$
LSZ261-171000-
MAFOR 1703/
Superior West...GALE WARNING IN EFFECT...11750 12751 19757 11851
19857 11851 11740 12830. Waves 5 to 8 feet.

Superior North Central...GALE WARNING IN EFFECT...11750 19757
11751 19767 13867 12851 19857 11851. Waves 7 to 11 feet building
to 9 to 13 feet overnight through Sunday evening.

Superior South Central...GALE WARNING IN EFFECT...12750 19757
14757 11757 11850 19857. Waves 7 to 10 feet building to 9 to 13
feet overnight. Waves 10 to 14 feet Sunday and Sunday evening.

Superior East...GALE WARNING IN EFFECT...13750 19757 11751 19757
11851 19857 12850 19857 11850 19857. Waves 10 to 14 feet
overnight and Sunday. Waves 8 to 11 feet Sunday evening.

$$

EK

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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