Great Lakes Forecast
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FZUS63 KMQT 181449
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM EST Sat Nov 18 2017

For waters beyond five 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 trough over Missouri will move northeast
today and strengthen to 29.0 inches across the Lower Great Lakes
overnight. A 30.3 inch high over the Southern Plains Sunday will
extend a 29.9 inch ridge over Lake Superior into Monday. Then, a
29.3 inch trough will move toward the Upper Great Lakes on Monday
evening, reaching Quebec by late Tuesday night. A 30.4 inch high
will slide southeast through the Northern Plains into the Mid-
Mississippi Valley Wednesday.

LSZ162-182300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EST Sat Nov 18 2017 /849 AM CST Sat Nov 18 2017/

.REST OF TODAY...North winds 5 to 15 knots becoming northwest
10 to 20 knots. Isolated snow showers in the afternoon. Waves
1 to 3 feet subsiding to calm to 2 feet, then building to 2 to
4 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Scattered snow showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by late morning, then diminishing to 10 to 20 knots by mid
afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. A slight chance of snow showers in the
evening. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.

$$

LSZ263-182300-
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 Sat Nov 18 2017

.REST OF TODAY...North winds 10 to 20 knots becoming northwest
15 to 25 knots by mid afternoon. Isolated snow showers in the
afternoon. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots. Scattered snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. A chance
of snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of snow showers in the
evening. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves building to 1 to
3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots early. A chance of snow showers. Waves building
to 7 to 10 feet occasionally to 13 feet, then subsiding to 3 to 5
feet occasionally to 7 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ264-182300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EST Sat Nov 18 2017

.REST OF TODAY...North winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Isolated snow showers in the
afternoon. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots backing northwest by
midnight. Scattered snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing west by mid afternoon. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A chance of snow showers in the evening.
Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. A chance of rain showers, possibly mixed
with snow after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots. A chance of rain showers.
A chance of snow showers. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.

$$

LSZ265-182300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EST Sat Nov 18 2017

.REST OF TODAY...North winds 15 to 25 knots. Isolated snow
showers, patchy drizzle and freezing drizzle in the afternoon.
Waves 3 to 5 feet occasionally to 7 feet building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Scattered snow showers
in the evening, then numerous snow showers after midnight. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers in the evening.
Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TUESDAY...West winds 20 to 30 knots with a few gale force gusts
to 35 knots early, then veering northwest 20 to 30 knots. A
chance of rain showers. Snow showers likely. Waves building to 6
to 9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 1 to 3 feet.

$$

LSZ266-182300-
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 Sat Nov 18 2017

.REST OF TODAY...North winds 10 to 20 knots increasing to 20 to
30 knots. Isolated snow showers and patchy drizzle in the
afternoon. Waves 3 to 5 feet occasionally to 7 feet building to
4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots. Occasional gale force
gusts to 35 knots possible. Numerous snow showers. Waves building
to 6 to 10 feet occasionally to 13 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of rain showers after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots with a few gale force
gusts to 35 knots veering northwest. A chance of
rain showers. Snow showers likely. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.

$$

LSZ267-182300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EST Sat Nov 18 2017

.REST OF TODAY...North winds 10 to 20 knots increasing to 20 to
30 knots. Patchy drizzle. Waves 1 to 3 feet building to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...North winds 20 to 30 knots. Scattered snow showers and
areas of drizzle in the evening, then numerous snow showers after
midnight. Waves building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...North winds 20 to 30 knots backing northwest. Snow
showers likely. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots becoming south 15 to 25 knots
in the afternoon. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.MONDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.TUESDAY...West winds 20 to 30 knots with a few gale force
gusts to 35 knots veering northwest. A chance of rain showers.
Snow showers likely. Waves building to 10 to 14 feet occasionally
to 18 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.

$$
LSZ261-182300-
MAFOR 1816/
Superior West 12720 14730 11730 11620. Scattered snow showers
after midnight tonight. Waves 1 to 6 feet.

Superior North Central 11820 12830 13740 12730. Scattered snow
showers tonight through Sunday morning. Freezing spray late
tonight through mid morning Sunday. Waves 3 to 7 feet.

Superior South Central 12830 12740 13747 11737. Scattered snow
showers this evening. Waves 3 to 6 feet this afternoon. Waves 5
to 9 feet tonight through Sunday morning.

Superior East 11820 12830 11840 13847 11737. Scattered snow
showers late this evening. Waves 3 to 6 feet this afternoon,
building to 5 to 8 feet tonight through Sunday morning.


$$

KCW

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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