Great Lakes Forecast
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FZUS63 KMQT 201347
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 AM EDT Fri Oct 20 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 over the Lower Great Lakes late
this morning will move east today. A 29.1 inch low pressure over
the Canadian Prairies today will track toward Western Hudson Bay
through Sunday, passing a 29.7 inch trough across Lake Superior
Saturday night. Weak ridging of 30.0 inches will track eastward
across Lake Superior late Sunday ahead of a 29.7 inch trough that
will cross Lake Superior Monday night.

LSZ162-202200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EDT Fri Oct 20 2017 /847 AM CDT Fri Oct 20 2017/

.REST OF TODAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A chance of showers after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of showers through early
afternoon, then showers likely and a chance of thunderstorms.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of thunderstorms through midnight. Showers
likely. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots backing southwest by mid
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots becoming north 20 to
30 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to calm to 2 feet.

$$

LSZ263-202200-
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-
947 AM EDT Fri Oct 20 2017

.REST OF TODAY...South winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of showers after midnight. Waves
building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots diminishing 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,
then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of thunderstorms through midnight.
Showers likely. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. A chance of showers. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-202200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EDT Fri Oct 20 2017

.REST OF TODAY...South winds 5 to 15 knots backing southeast
late. Waves 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers after midnight. Waves
building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 2 to 4 feet.

$$

LSZ265-202200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EDT Fri Oct 20 2017

.REST OF TODAY...South winds 5 to 15 knots. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and a slight chance of thunderstorms. Waves subsiding to 2 to
4 feet.
.SUNDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots veering north. A chance
of showers. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 20 to 30 knots. Rain showers likely, then
a chance of rain showers. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ266-202200-
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-
947 AM EDT Fri Oct 20 2017

.REST OF TODAY...South winds 15 to 25 knots. Waves 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...South winds 20 to 30 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots veering west by mid
afternoon. Showers likely. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots veering northwest. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.
.TUESDAY...North winds 20 to 30 knots. Showers likely, then a
chance of showers. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-202200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EDT Fri Oct 20 2017

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves 2 to 4 feet subsiding to 1 to 3
feet.
.TONIGHT...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 20 to 30 knots. A slight chance of
showers by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms. Waves subsiding to 2 to
4 feet.
.SUNDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots by mid afternoon. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves 1 to
3 feet.
.MONDAY...South winds 15 to 25 knots veering northwest. A chance
of showers. Waves building to 2 to 4 feet.
.TUESDAY...North winds 20 to 30 knots. Rain showers likely. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-202200-
MAFOR 2015/
Superior West 11410 11400 11310 13420 12430. Chance of showers
Saturday morning. Waves 1 to 4 feet.

Superior North Central 11410 12310 14420 11430. Chance of showers
late Saturday morning. Waves 1 to 4 feet.

Superior South Central 15420 12430. Waves 1 to 4 feet.

Superior East 11420 11410 12420 14430. Waves 2 to 5 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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