Great Lakes Forecast
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FZUS63 KMQT 120159
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 PM EDT Fri Aug 11 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 low pressure over the eastern Great Lakes
will move to western Quebec Saturday morning and deepen to 29.8
inches. A 30.1 inch high pressure centered over Minnesota
Saturday morning will move over the Great Lakes Sunday, then
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 far western Ontario.

LSZ162-121000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 PM EDT Fri Aug 11 2017 /859 PM CDT Fri Aug 11 2017/

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots. Scattered showers. Waves building to 1 to 3 feet.

$$

LSZ263-121000-
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-
959 PM EDT Fri Aug 11 2017

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots late. Waves calm to 2 feet.
.SUNDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south.
Scattered showers. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.

$$

LSZ264-121000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 PM EDT Fri Aug 11 2017

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots becoming west less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south.
Scattered showers. Waves building to 1 to 3 feet.

$$

LSZ265-121000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 PM EDT Fri Aug 11 2017

.REST OF TONIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves 2 to 4 feet subsiding to
1 to 3 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west late.
Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-121000-
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-
959 PM EDT Fri Aug 11 2017

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet.

$$

LSZ267-121000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 PM EDT Fri Aug 11 2017

.REST OF TONIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A chance of showers by late evening. A slight chance of drizzle.
Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest in the
afternoon, then diminishing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight, then diminishing to 5 to 15 knots late. Waves
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.

$$
LSZ261-121000-
MAFOR 1203/
Superior West 12600 12700 11600 13500. Waves 1 foot or less.

Superior North Central 12710 12700 12600 12610. Waves 2 feet or
less.

Superior South Central 13720 12710 12700 11600. Waves 1 to 3 feet
subsiding to 1 foot or less overnight and Saturday. Waves 1 foot
or less Saturday evening.

Superior East 12830 11720 11820 11720 13710. Waves 2 to 4 feet
overnight subsiding to 1 to 3 feet Saturday. Waves 1 to 2 feet
Saturday evening.

$$

RJT

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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