National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 180156
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
956 PM EDT Fri Sep 17 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 30.1 inch ridge over Lake Superior is expected to
build to 30.2 inches by Saturday morning. This ridge should remain
over the lake until Saturday evening. The lake should be in a
mixed pattern Sunday as the 30.2 inch ridge continues eastward and
a deepening 29.2 inch low over the Canadian Prairies moves
northeast towards Hudson Bay. Monday through Tuesday, a 29.6 inch
trough is expected to slowly move from west to east across the
lake before the next high pressure of at least 30.1 inches builds
in behind it on Wednesday.

&&

LSZ162-181000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
956 PM EDT Fri Sep 17 2021 /856 PM CDT Fri Sep 17 2021/

REST OF TONIGHT
Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering north late. Waves 1 to
3 feet subsiding to calm to 2 feet.

SATURDAY
South winds 5 to 15 knots becoming east 10 to
20 knots late. Waves calm to 2 feet.

SATURDAY NIGHT
Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.

SUNDAY
South winds 10 to 20 knots. Waves building to 2 to
4 feet.

SUNDAY NIGHT
South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.

MONDAY
South winds 10 to 20 knots. A chance of showers. Waves
subsiding to 1 to 3 feet.

MONDAY NIGHT
Southwest winds 15 to 25 knots veering northwest
after midnight. Showers. Waves 1 to 3 feet.

TUESDAY
Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

WEDNESDAY
Northwest winds 10 to 20 knots backing southeast.
Waves calm to 2 feet.

LSZ263-181000-
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-
956 PM EDT Fri Sep 17 2021

REST OF TONIGHT
Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves 2 to 4 feet subsiding to calm
to 2 feet.

SATURDAY
South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.

SATURDAY NIGHT
Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 2 to 4 feet.

SUNDAY
South winds 15 to 25 knots. Waves 2 to 4 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
South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet.

MONDAY NIGHT
Southwest winds 15 to 25 knots veering west after
midnight. Showers. Waves 1 to 3 feet.

TUESDAY
Northwest winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

WEDNESDAY
Northwest winds 10 to 20 knots backing southeast.
Waves subsiding to calm to 2 feet.

LSZ264-181000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
956 PM EDT Fri Sep 17 2021

REST OF TONIGHT
Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then veering north late. Waves 3 to
6 feet occasionally to 8 feet subsiding to calm to 2 feet.

SATURDAY
South winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.

SATURDAY NIGHT
Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 2 to 4 feet.

SUNDAY
South winds 10 to 20 knots. Waves building to 3 to
6 feet occasionally to 8 feet.

SUNDAY NIGHT
South winds 10 to 20 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.

MONDAY
South winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of showers. Waves building to 3 to
6 feet occasionally to 8 feet.

MONDAY NIGHT
South winds 15 to 25 knots veering southwest
after midnight. Showers likely. Waves subsiding to 2 to 4 feet.

TUESDAY
Northwest winds 10 to 20 knots increasing to 15 to
25 knots. Showers likely, then a chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.

WEDNESDAY
North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

LSZ265-181000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
956 PM EDT Fri Sep 17 2021

REST OF TONIGHT
Northwest winds 10 to 20 knots becoming north
5 to 15 knots late. Waves 2 to 4 feet subsiding to calm to
2 feet.

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

SATURDAY NIGHT
Southeast winds 10 to 20 knots veering south
after midnight, then increasing to 15 to 25 knots late. Waves
building to 1 to 3 feet.

SUNDAY
South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.

SUNDAY NIGHT
South winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.

MONDAY
South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.

MONDAY NIGHT
South winds 15 to 25 knots veering southwest
after midnight. A chance of showers through midnight, then
showers likely after midnight. Waves subsiding to 1 to 3 feet.

TUESDAY
Northwest winds 15 to 25 knots. Showers likely, then a
chance of showers. Waves building 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.

LSZ266-181000-
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-
956 PM EDT Fri Sep 17 2021

REST OF TONIGHT
Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then becoming north 5 to 15 knots
late. Waves 3 to 6 feet occasionally to 8 feet subsiding to 1 to
3 feet.

SATURDAY
Northeast winds 5 to 15 knots veering south in the
afternoon, then backing southeast late. Waves subsiding to calm
to 2 feet.

SATURDAY NIGHT
Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.

SUNDAY
South winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.

SUNDAY NIGHT
South winds 20 to 30 knots. Waves 3 to 6 feet
occasionally to 8 feet.

MONDAY
South winds 15 to 25 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

MONDAY NIGHT
South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers through midnight,
then showers likely after midnight. Waves subsiding to 2 to
4 feet.

TUESDAY
Northwest winds 20 to 30 knots. Showers likely, then a
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet.

WEDNESDAY
North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

LSZ267-181000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
956 PM EDT Fri Sep 17 2021

REST OF TONIGHT
West winds 15 to 25 knots veering northwest
after midnight, then becoming north 10 to 20 knots late. Waves
3 to 6 feet occasionally to 8 feet subsiding to 2 to 4 feet.

SATURDAY
Northeast winds 5 to 15 knots veering south in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.

SATURDAY NIGHT
Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 1 to 3 feet.

SUNDAY
South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.

SUNDAY NIGHT
South winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.

MONDAY
South winds 15 to 25 knots. Waves 2 to 4 feet.

MONDAY NIGHT
South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers through midnight,
then showers likely after midnight. Waves 2 to 4 feet.

TUESDAY
West winds 20 to 30 knots becoming northwest 15 to
25 knots. Showers likely, then a chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.

WEDNESDAY
Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

LSZ261-181000-
MAFOR 1803/
Superior West 11710 11800 11100 13400 12310. Waves 1 to 3 feet
overnight. Waves 2 feet or less Saturday and Saturday evening.

Superior North Central 11720 11810 11700 12500 11400 11310 11320.
Waves 3 to 5 feet subsiding to 2 to 4 feet overnight. Waves 1 to
3 feet Saturday and Saturday evening.

Superior South Central 11720 11810 11800 11700 11400 11300 11310
11320. Waves 2 to 4 feet subsiding to 1 to 3 feet overnight.
Waves 2 feet or less Saturday and Saturday evening.

Superior East 11720 12810 11200 12400 11300 11310. Waves 3 to 6
feet overnight. Waves 2 to 4 feet subsiding to 1 to 2 feet
Saturday. Waves around 1 foot Saturday evening.

TAP

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

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