Great Lakes Forecast
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FZUS63 KMQT 170739
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
339 AM EDT Tue Oct 17 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...Low pressure of 29.4 inches over northern Ontario and
30.3 inch high pressure over the Ohio River Valley this morning will
move east today to Quebec and the eastern seaboard respectively.
The high pressure system will remain stationary through Saturday
over the eastern seaboard. Meanwhile, a 29.0 inch low pressure
system over western Saskatchewan tonight moves to Hudson Bay
Wednesday night and remains there through Thursday. 29.2 inch low
pressure will develop over eastern Alberta Friday morning and
create a trough of low pressure of 29.4 inches over the northern
plains Saturday morning. This trough will weaken to 29.6 inches in
Minnesota by Saturday evening.

LSZ162-171545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
339 AM EDT Tue Oct 17 2017 /239 AM CDT Tue Oct 17 2017/

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots veering west. A chance of
showers. Waves 2 to 4 feet.

$$

LSZ263-171545-
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-
339 AM EDT Tue Oct 17 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 15 to
25 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves building to
4 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding
to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ264-171545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
339 AM EDT Tue Oct 17 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves building to
5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ265-171545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
339 AM EDT Tue Oct 17 2017

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming south 20 to
30 knots in the afternoon, then veering southwest late. Waves
building to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SATURDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.

$$

LSZ266-171545-
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-
339 AM EDT Tue Oct 17 2017

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 4 to 7
feet occasionally to 9 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
after midnight. Waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...South winds 20 to 30 knots. A few gale force gusts
to 35 knots late. Waves building to 4 to 8 feet occasionally to
10 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. Waves subsiding to 4 to 7 feet occasionally to
9 feet, then building to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots backing south
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-171545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
339 AM EDT Tue Oct 17 2017

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TODAY...West winds 15 to 25 knots diminishing to 5 to 15 knots
late. Waves subsiding to 2 to 4 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25
knots. Waves subsiding to 1 to 3 feet, then building to 2 to 4
feet.
.WEDNESDAY...South winds 20 to 30 knots. A few gale force gusts to
35 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally
to 8 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots with a few gale
force gusts to 35 knots becoming west after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots with a few gale force gusts
to 35 knots. Waves building to 6 to 9 feet occasionally to 11
feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ261-171545-
MAFOR 1709/
Superior West 11620 11610 13510 11410 12520. Waves 3 to 5 feet
subsiding to 1 to 3 feet today. Waves 1 to 3 feet building to 2
to 4 feet tonight.

Superior North Central 11630 11620 12610 11510 11410 12420. Waves
5 to 7 feet subsiding to 2 to 3 feet today. Waves 2 to 4 feet
building to 3 to 5 feet tonight.

Superior South Central 11630 12620 11610 11500 11310 12420. Waves
3 to 5 feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet
tonight.

Superior East 11530 11630 12620 11610 11410 12420. Waves 4 to 7
feet subsiding to 3 to 5 feet today. Waves 2 to 4 feet tonight.

$$

07

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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