Great Lakes Forecast
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FZUS63 KMQT 121359
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 AM EDT Tue Sep 12 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 30.0 inch ridge extending westward across the Upper
Great Lakes will gradually weaken to 29.8 inches through tonight.
A weak 29.7 inch trough over northern Ontario today will
dissipate over Lake Superior on Wednesday. A 30.2 inch ridge will
then build across northern Ontario through Friday as 29.5 inch low
pressure develops over the Plains. The trough will reach the
Upper Mississippi Valley on Saturday as the ridge extends over the
Lower Great Lakes.

LSZ162-122200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 AM EDT Tue Sep 12 2017 /859 AM CDT Tue Sep 12 2017/

.REST OF TODAY...Southwest winds 5 to 15 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers. Waves building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers. Waves 1 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.

$$

LSZ263-122200-
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 AM EDT Tue Sep 12 2017

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming east less
than 10 knots late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers. Waves building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.FRIDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ264-122200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 AM EDT Tue Sep 12 2017

.REST OF TODAY...Southwest winds 5 to 15 knots. Waves 1 to 3
feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming southeast
less than 10 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers after midnight. Waves building to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. A chance of showers. Waves 1 to 3 feet.
.FRIDAY...Southeast winds 5 to 15 knots veering south. A chance
of showers. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-122200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 AM EDT Tue Sep 12 2017

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 5 to 15 knots late. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.

$$

LSZ266-122200-
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 AM EDT Tue Sep 12 2017

.REST OF TODAY...West winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing southeast late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-122200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 AM EDT Tue Sep 12 2017

.REST OF TODAY...West winds 5 to 15 knots veering north late.
Patchy fog. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. Patchy fog.
Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Waves calm to
2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves 1 to 3 feet.

$$
LSZ261-122200-
MAFOR 1215/
Superior West 12500 13400 13500. Waves 1 foot or less.

Superior North Central 13510 12410 13510. Waves 1 to 3 feet.

Superior South Central 11500 11400 11300 11310 12410 12400. Waves
2 feet or less.

Superior East 11600 11500 11400 11300 14410. Patchy fog late
tonight. Waves 1 to 2 feet.

$$

Kluber

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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