Great Lakes Forecast
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482
FZUS63 KMQT 171954
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 PM EDT Sun Sep 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...High pressure of 30.1 inches will move eastward
across the Upper Great Lakes through Monday. As the high shifts to
southern Quebec by Tuesday afternoon, a 29.5 inch trough will move
across the Northern Plains. This trough will weaken to 29.8 inches
as it sweeps eastward, passing across Lake Superior Wednesday
afternoon and evening. Another low pressure trough of 29.7 inches
will then emerge over the Plains states on Thursday before slowly
shifting into the western Great Lakes on Friday.

LSZ162-180400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EDT Sun Sep 17 2017 /254 PM CDT Sun Sep 17 2017/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. A slight chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. A chance of showers. Waves 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-180400-
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-
354 PM EDT Sun Sep 17 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south late. A
slight chance of showers by mid afternoon. Waves subsiding to
calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A chance of showers through midnight. Waves subsiding
to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves building to 1 to
3 feet.

$$

LSZ264-180400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EDT Sun Sep 17 2017

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south late. A
slight chance of showers by mid afternoon. Waves subsiding to
calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast late.
A slight chance of showers through midnight. Waves calm to
2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of showers after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south by mid
afternoon. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. A chance of
showers. Waves building to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-180400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EDT Sun Sep 17 2017

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming northwest 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 10 to 20 knots late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots veering south by mid
afternoon. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots becoming north 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

$$

LSZ266-180400-
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-
354 PM EDT Sun Sep 17 2017

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...North winds 5 to 15 knots backing south in the
afternoon. A slight chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots backing southeast after
midnight, then increasing to 10 to 20 knots late. A chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots becoming south 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ267-180400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EDT Sun Sep 17 2017

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. A slight
chance of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...North winds 5 to 15 knots. A slight chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering east after
midnight, then increasing to 10 to 20 knots late. A chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves building
to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. Waves 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.

$$

LSZ261-180400-
MAFOR 1721/
Superior West 11640 11630 13610 11500 11510 11410. Waves 4 to 7
feet subsiding to 1 to 3 feet tonight and Monday.

Superior North Central 11640 11630 11620 11720 11610 12510 11410.
Waves 5 to 9 feet subsiding to 3 to 5 feet tonight. Waves 1 to 3
feet Monday.

Superior South Central 11640 11630 12720 11710 11600 11410 11310.
Waves 4 to 7 feet subsiding to 1 to 3 feet tonight and Monday.

Superior East 12730 13720 11810 11600 11510. Waves 5 to 8 feet
tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet Monday.

$$

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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