National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 231358
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 AM EDT Thu Mar 23 2023

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 30.2 inch high builds over Lake Superior today and
persists into Friday. By Friday evening, this high will be over
the southern Ontario/Quebec line as a 29.5 inch low over the
Ozarks surges northeast. This low will reach Lower Michigan at
29.2 inches Saturday and weaken slightly as it reaches southern
Ontario Saturday night at 29.3 inches. The low will continue
weakening as it moves northeast into Quebec on Sunday with ridging
at 30.1 inches building in Sunday evening. Ridging continues to
build through the middle of next week.

LSZ162-232200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 AM EDT Thu Mar 23 2023 /858 AM CDT Thu Mar 23 2023/

REST OF TODAY
Northwest winds 10 to 20 knots backing west in
the afternoon, then becoming southwest 5 to 15 knots late. Waves
1 to 3 feet subsiding to calm to 2 feet, then building to 1 to
3 feet.

TONIGHT
Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.

FRIDAY
Southwest winds 5 to 15 knots backing south late. Waves
calm to 2 feet.

FRIDAY NIGHT
East winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.

SATURDAY
Northeast winds 10 to 20 knots backing northwest by
mid afternoon. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.

SATURDAY NIGHT
Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.

SUNDAY
Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

MONDAY
North winds 10 to 20 knots increasing to 15 to
25 knots. Waves calm to 2 feet.


LSZ263-232200-
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-
958 AM EDT Thu Mar 23 2023

REST OF TODAY
Northwest winds 10 to 20 knots backing west in
the afternoon, then diminishing to 5 to 15 knots late. Waves 3 to
5 feet occasionally to 7 feet subsiding to calm to 2 feet, then
building to 1 to 3 feet.

TONIGHT
West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.

FRIDAY
Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves calm to 2 feet.

FRIDAY NIGHT
East winds 5 to 15 knots. Waves calm to 2 feet.

SATURDAY
Northeast winds 10 to 20 knots backing north by mid
afternoon. Waves building to 1 to 3 feet.

SATURDAY NIGHT
Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.

SUNDAY
Northwest winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.

MONDAY
North winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.


LSZ264-232200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 AM EDT Thu Mar 23 2023

REST OF TODAY
Northwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon, then backing west late. Waves
4 to 7 feet occasionally to 9 feet subsiding to 2 to 4 feet.

TONIGHT
West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.

FRIDAY
Southwest winds 5 to 15 knots backing south late. Waves
calm to 2 feet.

FRIDAY NIGHT
Southeast winds 5 to 15 knots. Waves calm to
2 feet.

SATURDAY
Northeast winds 5 to 15 knots becoming north 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.

SATURDAY NIGHT
North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.

SUNDAY
North winds 20 to 30 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.

MONDAY
Southeast winds 5 to 15 knots becoming north 15 to
25 knots. Waves building to 2 to 4 feet.


LSZ265-232200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 AM EDT Thu Mar 23 2023

REST OF TODAY
Northwest winds 15 to 25 knots diminishing to 10
to 20 knots in the afternoon. Waves 3 to 6 feet occasionally to 8
feet subsiding to 2 to 4 feet.

TONIGHT
West winds 10 to 20 knots becoming southwest 5 to
15 knots late. Waves subsiding to calm to 2 feet.

FRIDAY
Southwest winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 10 to 20 knots late. Waves
calm to 2 feet.

FRIDAY NIGHT
Southeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.

SATURDAY
Northeast winds 10 to 20 knots becoming north 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.

SATURDAY NIGHT
Northwest winds 20 to 30 knots. Waves building
to 4 to 7 feet occasionally to 9 feet.

SUNDAY
Northwest winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.

MONDAY
Southeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 2 to 4 feet.


LSZ266-232200-
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-
958 AM EDT Thu Mar 23 2023

REST OF TODAY
Northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. Freezing spray by late morning. Waves 8 to
11 feet occasionally to 14 feet subsiding to 4 to 7 feet
occasionally to 9 feet.

TONIGHT
Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southwest late. Waves
subsiding to 1 to 3 feet.

FRIDAY
South winds 5 to 15 knots becoming southeast 10 to
20 knots late. Waves subsiding to calm to 2 feet.

FRIDAY NIGHT
Southeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.

SATURDAY
Northeast winds 10 to 20 knots becoming north 20 to
30 knots by mid afternoon. A chance of snow. Waves building to
3 to 6 feet occasionally to 8 feet.

SATURDAY NIGHT
North winds 20 to 30 knots becoming northwest
gales to 35 knots after midnight. A chance of rain and snow
through midnight. Waves building to 7 to 10 feet occasionally to
13 feet.

SUNDAY
Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

MONDAY
Southeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 2 to 4 feet.


LSZ267-232200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 AM EDT Thu Mar 23 2023

REST OF TODAY
Northwest winds 20 to 30 knots. Waves 8 to
11 feet occasionally to 14 feet subsiding to 5 to 8 feet
occasionally to 10 feet.

TONIGHT
Northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming north 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.

FRIDAY
Southeast winds 5 to 15 knots veering south in the
afternoon, then becoming east 10 to 20 knots late. Waves
subsiding to calm to 2 feet.

FRIDAY NIGHT
East winds 10 to 20 knots. Waves calm to 2 feet.

SATURDAY
Northeast winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. A chance of snow through early
afternoon, then snow, possibly mixed with rain by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.

SATURDAY NIGHT
North gales becoming northwest 20 to 30 knots
with some gale force gusts to 35 knots possible. A chance of
rain, possibly mixed with snow through midnight. Waves building to
7 to 10 feet occasionally to 13 feet.

SUNDAY
Northwest winds 20 to 30 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.

MONDAY
East winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 1 to 3 feet.

LSZ261-232200-
MAFOR 2315/
Superior West 11710 11610 11520 11510 11610 11600 11500 11510.
Waves 1 to 3 feet this afternoon and tonight. Waves 1 foot or
less Friday morning.

Superior North Central 11730 11720 12620 11610 11600 12500. Waves
3 to 6 feet subsiding to 1 to 4 feet this afternoon through
Friday.

Superior South Central 12730 12720 11610 11600 12500. Waves 3 to
7 feet this afternoon subsiding to 1 to 3 feet tonight. Waves 2
feet or less Friday morning.

Superior East 11740 13730 11720 11710 11800 11200. Waves 7 to 11
feet subsiding to 6 to 9 feet this afternoon, then subsiding to 3
to 5 feet tonight. Waves 2 to 3 feet Friday morning.


Jablonski

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes