Great Lakes Forecast
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FZUS63 KMQT 130803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 AM EDT Sun Aug 13 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 30.1 inch high pressure across the Upper Great
Lakes will remain nearly stationary through Tuesday. As the high
moves over the East Coast Wednesday, a 29.6 inch low pressure will
make its way from the northern Plains to central Upper Michigan.
The low will shift east of Lake Superior through the day Thursday
as a 29.9 inch ridge builds back into the Upper Great Lakes
region.

LSZ162-131615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 AM EDT Sun Aug 13 2017 /303 AM CDT Sun Aug 13 2017/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots diminishing to less than
10 knots after midnight. A chance of showers. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots veering southeast. Showers
likely. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-131615-
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-
403 AM EDT Sun Aug 13 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then veering west late. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then veering west late. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds less than 10 knots becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots veering southeast. A
chance of showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.

$$

LSZ264-131615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 AM EDT Sun Aug 13 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Waves
calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.MONDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.TUESDAY...Southwest winds less than 10 knots backing south by
mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-131615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 AM EDT Sun Aug 13 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then becoming southeast less than 10 knots late. Waves
calm to 2 feet.
.TONIGHT...South winds less than 10 knots becoming southwest 5 to
15 knots after midnight, then veering west late. A slight chance
of showers after midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southeast late. A
slight chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.

$$

LSZ266-131615-
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-
403 AM EDT Sun Aug 13 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-131615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 AM EDT Sun Aug 13 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots becoming west less than
10 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...South winds less than 10 knots increasing to 5 to
15 knots after midnight, then veering southwest late. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest late. Waves
calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-131615-
MAFOR 1309/
Superior West 11600 13500 11510 11610 12600. Waves 1 foot or
less.

Superior North Central 11600 12610 14510 11510. Waves 1 to 2
feet.

Superior South Central 14600 11300 11400 12500. Waves 1 foot or
less.

Superior East 14500 11500 12400 11500. Waves 1 foot 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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