Great Lakes Forecast
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FZUS63 KMQT 172014
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
414 PM 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...A 29.9 inch ridge will cross the Upper Great Lakes this
evening. 29.1 inch low pressure will then track from central
Saskatchewan tonight to southern Hudson Bay through Thursday as a
30.3 inch high pressure remains nearly stationary across the Mid
Atlantic states through Saturday. Another 30.0 inch ridge will
briefly cross Lake Superior on Thursday. 29.1 inch low pressure
over the Canadian Prairies on Friday will track to western Hudson
Bay through Sunday, passing a 29.7 inch trough across Lake
Superior Saturday evening.

LSZ162-180415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
414 PM EDT Tue Oct 17 2017 /314 PM CDT Tue Oct 17 2017/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then increasing to 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 diminishing to 15 to
25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 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...South 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. A chance of showers
after midnight. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ263-180415-
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-
414 PM EDT Tue Oct 17 2017

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots with a few gale force
gusts to 35 knots in the afternoon, then diminishing to 20 to 30
knots late. Waves building to 4 to 7 feet occasionally to 9 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 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 backing south
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots. Waves 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves 2 to 4 feet.

$$

LSZ264-180415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
414 PM EDT Tue Oct 17 2017

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

$$

LSZ265-180415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
414 PM EDT Tue Oct 17 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots 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 with a few gale force gusts
to 35 knots diminishing to 15 to 25 knots by mid afternoon. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. 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...Southwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 1 to 3 feet.

$$

LSZ266-180415-
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-
414 PM EDT Tue Oct 17 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 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. Waves building to 4 to
8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. Waves building to 6 to 9 feet occasionally to
11 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then 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
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Southwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 2 to 4 feet.

$$

LSZ267-180415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
414 PM EDT Tue Oct 17 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
after midnight. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots with a few gale force
gusts to 35 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots with a few gale
force gusts to 35 knots veering west after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
6 to 9 feet occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots with a few gale force gusts
to 35 knots diminishing to 20 to 30 knots by mid afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 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 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. 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. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ261-180415-
MAFOR 1721/
Superior West 11410 12420 11530 14540. Waves 1 to 4 feet building
to 3 to 6 feet Wednesday.

Superior North Central 11510 13420 12540 12550. Waves 2 to 6 feet
building to 5 to 8 feet Wednesday.

Superior South Central 11500 11310 13420 11430 12440. Waves 1 to
4 feet building to 3 to 5 feet Wednesday.

Superior East 11610 11410 12420 11430 12440 11450. Waves 2 to 6
feet building to 5 to 8 feet Wednesday.

$$

JSS

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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