Great Lakes Forecast
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FZUS63 KMQT 160142
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 PM EDT Tue Aug 15 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 30.0 inches currently over the Upper
Great Lakes will move to the Lower Great Lakes by late Wednesday
afternoon. Low pressure of 29.6 inches will organize over the
Central Plains on Wednesday. This low will track across the Upper
Great Lakes on Thursday and reach southwest Quebec Friday night.
In its wake, high pressure of 30.0 inches will shift east to the
western Great Lakes late Friday and then expand over the Great
Lakes region Saturday into Sunday.

LSZ162-160945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 PM EDT Tue Aug 15 2017 /842 PM CDT Tue Aug 15 2017/

.REST OF TONIGHT...East winds 5 to 15 knots. Waves 1 to 3 feet,
except 2 to 4 feet near Duluth.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. Showers. A slight
chance of thunderstorms after midnight. Patchy fog after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots by mid afternoon. Patchy fog. Showers. Waves 2 to
4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Patchy fog through midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-160945-
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-
942 PM EDT Tue Aug 15 2017

.REST OF TONIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A slight chance of
showers. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. A chance of showers
through midnight, then showers after midnight. Waves building to
2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Patchy fog. Showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Patchy fog. A chance of showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-160945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 PM EDT Tue Aug 15 2017

.REST OF TONIGHT...Southeast winds less than 10 knots. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers through midnight,
then showers likely after midnight. Patchy fog after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Patchy fog. Showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Areas of fog. Showers likely
through midnight. A chance of showers after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Patchy fog through early afternoon.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming southwest less
than 10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves building to 1 to 3 feet.

$$

LSZ265-160945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 PM EDT Tue Aug 15 2017

.REST OF TONIGHT...North winds less than 10 knots veering
southeast after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight, then increasing to 15 to 25 knots late. A chance
of showers. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots backing east by mid
afternoon. Showers. Patchy fog by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. Patchy fog. A chance of showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-160945-
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-
942 PM EDT Tue Aug 15 2017

.REST OF TONIGHT...North winds less than 10 knots veering
southeast late. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight, then increasing to 15 to 25 knots late. A chance
of showers. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots becoming east 20 to
30 knots by mid afternoon. Showers. Patchy fog by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots backing north after
midnight. Areas of fog. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 2 to
4 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Patchy fog through early afternoon. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ267-160945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 PM EDT Tue Aug 15 2017

.REST OF TONIGHT...North winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. Patchy fog. Showers likely. Waves
subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 15 to 25 knots. Patchy fog through
early afternoon. A chance of showers. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$
LSZ261-160945-
MAFOR 1603/
Superior West 12200 13210 11220 12236. Chance of showers
Wednesday afternoon. Waves 1 to 3 feet overnight and Wednesday.
Waves 2 to 5 feet Wednesday evening.

Superior North Central 14300 12310 12210. Chance of showers
Wednesday evening. Waves 2 feet or less.

Superior South Central 11200 13300 11310 11210 12220. Waves 3
feet or less.

Superior East 11800 11100 14200 11200 11210. Waves 2 feet or
less.

$$

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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