Great Lakes Forecast
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834
FZUS63 KMQT 180757
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM EDT Wed Oct 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 28.7 inch low will track across central Manitoba
today, pushing a trough of 29.7 inches across Lake Superior later
today and tonight. A nearly stationary 30.2 inch area of high
pressure across the Mid Atlantic states will push a 30.0 inch
ridge across Lake Superior Thursday into Friday. On Friday, a 29.1
inch low pressure over the Canadian Prairies will track towards
Hudson Bay through Sunday, passing a 29.8 inch trough across Lake
Superior by Saturday night. Weak ridging of 30.0 inches will track
eastward across the lake on Sunday.

LSZ162-181600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EDT Wed Oct 18 2017 /257 AM CDT Wed Oct 18 2017/

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

$$

LSZ263-181600-
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-
357 AM EDT Wed Oct 18 2017

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

$$

LSZ264-181600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EDT Wed Oct 18 2017

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...Southwest winds 20 to 30 knots. Waves building to 5 to
8 feet occasionally to 10 feet.
.TONIGHT...West winds 20 to 30 knots. Waves building to 7 to
10 feet occasionally to 13 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers. Waves subsiding to 2 to 4 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-181600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EDT Wed Oct 18 2017

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

$$

LSZ266-181600-
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-
357 AM EDT Wed Oct 18 2017

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...South winds 20 to 30 knots. A few gale force gusts to
35 knots in the afternoon. Waves building to 5 to 9 feet
occasionally to 11 feet.
.TONIGHT...West winds 20 to 30 knots. Waves building to 5 to
9 feet occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...West 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.
.FRIDAY NIGHT...South winds 20 to 30 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers, then showers likely. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots backing southwest. Showers
likely. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ267-181600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EDT Wed Oct 18 2017

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 2 to
4 feet.
.TODAY...South winds 20 to 30 knots. A few gale force gusts to
35 knots in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west after
midnight. A few gale force gusts to 35 knots. 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. A few gale force gusts to
35 knots. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 6 to 9 feet occasionally to 11 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.
.FRIDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Showers likely. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ261-181600-
MAFOR 1809/

Superior West 11530 13540 14640. Waves 1 to 3 feet building to 4
to 7 feet.

Superior North Central 11430 14540 13640. Waves 2 to 3 feet
building to 5 to 9 feet.

Superior South Central 12430 12440 19450 11540 13640. Waves 1 to
3 feet building to 4 to 7 feet.

Superior East 11430 13440 19450 12540 19550 12640. Waves 3 to 6
feet building to 6 to 9 feet.

$$

Ritzman

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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