Great Lakes Forecast
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FZUS63 KMQT 051449
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM EST Fri Mar 5 2021

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 high pressure ridge of 30.4 inches will remain over
Lake Superior through Sunday. A 29.7 inch trough will pass across
Lake Superior Sunday and Sunday night, followed by 30.2 inch
ridging on Monday. Another 29.7 inch trough is expected to lift
northeastward from the Central Plains to near Lake Superior by
late afternoon Tuesday into Wednesday.

LSZ162-052300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EST Fri Mar 5 2021 /849 AM CST Fri Mar 5 2021/

.REST OF TODAY...Northeast winds 5 to 15 knots veering east by
late morning, then veering south by mid afternoon. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering north by midnight,
then veering northeast late. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering southeast by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves building to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing south. Waves subsiding
to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. A chance
of rain showers. Waves building to 1 to 3 feet.

$$

LSZ263-052300-
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-
949 AM EST Fri Mar 5 2021

.REST OF TODAY...North winds 5 to 15 knots backing northwest by
mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north by midnight.
Waves building to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. Waves 2 to 4 feet.
.MONDAY...West winds 5 to 15 knots backing southwest. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ264-052300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EST Fri Mar 5 2021

.REST OF TODAY...North winds 10 to 20 knots increasing to 15 to
25 knots. Freezing spray late in the morning. Waves 2 to 4 feet
building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Freezing spray after midnight. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots. Freezing spray. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots becoming southeast
less than 10 knots after midnight. Waves subsiding to calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots becoming southwest
5 to 15 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 5 to 15 knots backing southwest. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. A chance
of rain showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-052300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EST Fri Mar 5 2021

.REST OF TODAY...Northwest winds 10 to 20 knots veering north by
late morning, then becoming northwest 15 to 25 knots by mid
afternoon. Waves 1 to 3 feet building to 3 to 6 feet occasionally
to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north by
midnight, then diminishing to 10 to 20 knots late. Freezing spray
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Freezing spray. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of rain showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-052300-
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-
949 AM EST Fri Mar 5 2021

.REST OF TODAY...North winds 20 to 30 knots backing northwest by
mid afternoon. Waves 3 to 5 feet occasionally to 7 feet building
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots. Freezing spray. Flurries.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots. Freezing spray. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-052300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EST Fri Mar 5 2021

.REST OF TODAY...North winds 20 to 30 knots backing northwest by
late morning, then increasing to 30 knots with a few gale force
gusts to 35 knots possible by mid afternoon. Freezing spray late
in the morning. Waves 3 to 5 feet occasionally to 7 feet building
to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots. Freezing spray. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then backing northwest by mid
afternoon. Freezing spray. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$
LSZ261-052300-
MAFOR 0516/
Superior West 11100 11300 11500 11600 11810 11110 12100. Waves 1
foot or less.

Superior North Central 11831 12830 11840 11831 13830. Waves 3 to
6 feet.

Superior South Central 13730 11840 11831 11830 11820 11830. Waves
3 to 6 feet this afternoon. Waves 4 to 7 feet tonight. Waves 3 to
6 feet Saturday morning.

Superior East 11741 12740 11840 11841 11840 12830. Waves 5 to 8
feet this afternoon. Waves 5 to 9 feet subsiding to 4 to 7 feet
tonight. Waves 4 to 6 feet Saturday morning.

$$

JH

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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