Great Lakes Forecast
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FZUS63 KMQT 160803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 AM EDT Wed Aug 16 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 this
afternoon. Low pressure of 29.6 inches over western Kansas this
morning 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.

LSZ162-161615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 AM EDT Wed Aug 16 2017 /303 AM CDT Wed Aug 16 2017/

.EARLY THIS MORNING...East winds 10 to 15 knots. Waves 2 to 4
feet.
.TODAY...East winds 10 to 15 knots increasing to 15 to 25 knots.
A chance of showers. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet late.
.TONIGHT...East winds 10 to 20 knots backing northeast late. A
chance of showers through midnight, then showers and a slight
chance of thunderstorms after midnight. Waves 3 to 5 feet
occasionally to 7 feet, subsiding to 2 to 4 feet.
.THURSDAY...Northeast winds 15 to 25 knots. Showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots 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 becoming west 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-161615-
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 Wed Aug 16 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...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 increasing to 15 to
25 knots in the afternoon, then backing northeast late. Showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to 2 to
4 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. 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 veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ264-161615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 AM EDT Wed Aug 16 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. 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. Showers likely through midnight,
then a chance of showers after midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet.

$$

LSZ265-161615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 AM EDT Wed Aug 16 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 10 to 20 knots backing east in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then becoming east 15 to 25 knots late. A chance of
showers. Waves building to 2 to 4 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Showers. A slight chance of thunderstorms by mid afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing north after
midnight. Showers likely. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 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...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...Southwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-161615-
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 Wed Aug 16 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.TONIGHT...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...East winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots becoming northeast
10 to 20 knots after midnight. A slight chance of thunderstorms
through midnight. Showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.FRIDAY...North winds 20 to 30 knots backing northwest by mid
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 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ267-161615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 AM EDT Wed Aug 16 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 15 to
25 knots after midnight. A slight chance of showers after
midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots becoming east late. A
chance of showers through early afternoon, then showers by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. A slight chance of thunderstorms through
midnight. Showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ261-161615-
MAFOR 1609/
Superior West 11210 14220 11230 11236 11226. Chance of showers
this evening. Waves 2 to 5 feet.

Superior North Central 11300 13310 12210 11220 11320. Chance of
showers late tonight. Waves 2 feet or less today. Waves 1 to 3
feet building to 2 to 4 feet tonight.

Superior South Central 13310 11210 12220 11310 11320. Waves 3 feet
or less.

Superior East 11200 11300 13200 11210 12320. Waves 3 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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