Great Lakes Forecast
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FZUS63 KMQT 200755
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 AM EDT Fri Apr 20 2018

For waters beyond 5 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 ridge of 30.2 inches over Lake Superior will build
to 30.4 inches through Monday morning before shifting slowly into
the lower Great Lakes. This will be followed by a weak 30.1 inch
trough Monday night into Tuesday.

LSZ162-201600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 AM EDT Fri Apr 20 2018 /255 AM CDT Fri Apr 20 2018/

.EARLY THIS MORNING...West winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds less than 10 knots veering
south after midnight. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 1 to 3 feet.

$$

LSZ263-201600-
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-
355 AM EDT Fri Apr 20 2018

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots backing south after
midnight, then veering southwest late. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY NIGHT...South winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TUESDAY...North winds 5 to 15 knots. A chance of rain showers. A
chance of snow showers. Waves building to 1 to 3 feet.

$$

LSZ264-201600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 AM EDT Fri Apr 20 2018

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then veering southwest late. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 2 to 4 feet.

$$

LSZ265-201600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 AM EDT Fri Apr 20 2018

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots veering northeast late. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon, then backing east late. Waves
calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ266-201600-
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-
355 AM EDT Fri Apr 20 2018

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing southwest late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...South winds 10 to 20 knots veering southwest. Waves
subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of rain showers.
A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-201600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 AM EDT Fri Apr 20 2018

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots veering southwest late. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY...South winds less than 10 knots backing southeast in
the afternoon, then becoming east 5 to 15 knots late. Waves calm
to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. A chance
of rain showers, possibly mixed with snow. Waves building to 1 to
3 feet.

$$

LSZ261-201600-
MAFOR 2009/
Superior West 16500. Waves 1 foot or less.

Superior North Central 14600 13500 11400. Waves 1 foot or less.

Superior South Central 13600 11700 11200 13400. Waves 1 foot or
less.

Superior East 11700 12400 13500 12400. Waves 2 feet or less.

$$

JLA

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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