Great Lakes Forecast
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FZUS63 KMQT 180848
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
348 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 29.5 inch trough over eastern Lake Superior will
move east today. The trough will strengthen to 29.0 inches across
the Lower Great Lakes Saturday night. A 30.3 inch high over the
Southern Plains Sunday will then build into the western Great
Lakes Sunday night. Then, a 29.3 inch trough will move toward the
Upper Great Lakes on Monday evening, reaching Southern Quebec by
late Tuesday night. A 30.5 inch high will then slide southeast
through the Northern Plains into the Mid- Mississippi Valley
Wednesday.

LSZ162-181700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
348 AM EST Sat Nov 18 2017 /248 AM CST Sat Nov 18 2017/

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...North winds 10 to 20 knots backing northwest by late
morning, then increasing to 15 to 25 knots by mid afternoon.
Isolated snow showers in the afternoon. Waves building to 1 to
3 feet, then subsiding to calm to 2 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.

$$

LSZ263-181700-
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-
348 AM EST Sat Nov 18 2017

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots by mid afternoon. Isolated snow showers in the
afternoon. Waves building to 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 gales to 35 knots diminishing to 20 to
30 knots. 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.

$$

LSZ264-181700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
348 AM EST Sat Nov 18 2017

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...North winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Isolated snow showers in the afternoon. Waves
building to 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 gales 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.

$$

LSZ265-181700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
348 AM EST Sat Nov 18 2017

.EARLY THIS MORNING...North winds 15 to 25 knots. Patchy drizzle.
Waves 2 to 4 feet.
.TODAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Isolated snow showers, patchy drizzle and freezing
drizzle in the afternoon. Waves 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 gales to 35 knots becoming 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.

$$

LSZ266-181700-
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-
348 AM EST Sat Nov 18 2017

.EARLY THIS MORNING...North winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...North winds 15 to 25 knots increasing to 20 to 30 knots.
Patchy drizzle. Isolated snow showers in the afternoon. Waves
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 gales 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.

$$

LSZ267-181700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
348 AM EST Sat Nov 18 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 10 to 20 knots increasing to 20 to 30 knots.
Patchy drizzle. Waves 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 gales 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.

$$

LSZ261-181700-
MAFOR 1810/
Superior West 12820 12720 14730. Scattered snow showers after
midnight tonight. Waves 1 to 3 feet today. Waves 2 to 4 feet
building to 3 to 5 feet tonight.

Superior North Central 11820 14830 13740. Scattered snow showers
tonight. Waves 2 to 4 feet building to 3 to 5 feet today. Waves 3
to 6 feet building to 4 to 7 feet tonight.

Superior South Central 11820 13830 12740 12747. Patchy drizzle
late this morning today. Scattered snow showers this evening.
Waves 2 to 4 feet building to 3 to 6 feet today. Waves 5 to 8
feet building to 6 to 9 feet tonight.

Superior East 12820 13830 11840 12847. Scattered snow showers
late this evening. Waves 1 to 3 feet building to 3 to 5 feet
today. Waves 3 to 6 feet building to 5 to 8 feet tonight.

$$

Titus

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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