Great Lakes Forecast
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FZUS63 KMQT 210805
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
405 AM EDT Sat Oct 21 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 29.1 inch low pressure over the Canadian Prairies
will track toward Western Hudson Bay through this weekend,
passing a 29.7 inch trough across Lake Superior tonight. 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. A strong low pressure system may move through
the region Monday night into Tuesday.


LSZ162-211615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
405 AM EDT Sat Oct 21 2017 /305 AM CDT Sat Oct 21 2017/

.EARLY THIS MORNING...South winds 10 to 20 knots. Isolated
showers. Waves 2 to 4 feet.
.TODAY...South winds 10 to 20 knots. Scattered showers. Isolated
thunderstorms by mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late. A
chance of showers through midnight. A slight chance of
thunderstorms. Showers after midnight. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then becoming southwest 15 to 25 knots late. A
chance of showers through early afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North gales to 35 knots backing northwest. A chance of
rain showers. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ263-211615-
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-
405 AM EDT Sat Oct 21 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Isolated
showers. Waves 2 to 4 feet.
.TODAY...South winds 10 to 20 knots. Scattered showers. Isolated
thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots. A chance of showers and a
slight chance of thunderstorms. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots backing southwest late.
Showers likely through early afternoon, then a slight chance of
showers by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North gales to 35 knots. A chance of rain showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ264-211615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
405 AM EDT Sat Oct 21 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Scattered showers. Isolated thunderstorms by
mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.TONIGHT...South winds 15 to 25 knots. A slight chance of
showers. A slight chance of thunderstorms after midnight. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Southwest winds 15 to 25 knots veering west late.
Showers through early afternoon, then a chance of showers by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North gales to 40 knots. Rain showers likely, then a
chance of rain showers. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming southwest
10 to 20 knots. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

$$

LSZ265-211615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
405 AM EDT Sat Oct 21 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots in the afternoon. Isolated showers and thunderstorms by
mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...South winds 15 to 25 knots backing southeast after
midnight, then veering south late. A slight chance of showers and
thunderstorms after midnight. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
in the afternoon. Showers. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. Waves 1 to
3 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A chance of showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...North gales to 40 knots. Rain showers likely, then a
chance of rain showers. Waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing southwest. A
chance of rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-211615-
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-
405 AM EDT Sat Oct 21 2017

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. Isolated showers and thunderstorms by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
A slight chance of showers through midnight. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
in the afternoon. Showers through early afternoon, then a chance
of showers by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots. A slight chance
of showers through midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A chance of showers. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North gales to 40 knots. Rain showers likely. Waves
building to 15 to 20 feet occasionally to 25 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming southwest
15 to 25 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ267-211615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
405 AM EDT Sat Oct 21 2017

.EARLY THIS MORNING...South winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...South winds 15 to 25 knots increasing to 20 to 30 knots
late. Isolated showers by mid afternoon. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then backing southeast late. A slight
chance of showers through midnight. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South gales to 35 knots diminishing to 20 to 30 knots
in the afternoon, then becoming west 15 to 25 knots late. A
chance of showers through early afternoon, then showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers through midnight. Waves building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.TUESDAY...North gales to 40 knots. Rain showers likely. Waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing southwest. A
chance of rain showers. Waves subsiding to 1 to 3 feet.

$$

LSZ261-211615-
MAFOR 2109/
Superior West 14420 11420 12410 11426. Scattered showers from
late morning on today. Scattered showers through early evening
tonight. Waves 2 to 4 feet today. Waves 1 to 3 feet tonight.

Superior North Central 12420 12430 14330. Scattered showers late
today. Scattered showers through early evening tonight. Waves 2
to 4 feet building to 3 to 6 feet today. Waves 4 to 7 feet
subsiding to 3 to 6 feet tonight.

Superior South Central 12420 11430 12330 11430 11420 11320. Waves
2 to 4 feet building to 3 to 5 feet today. Waves 3 to 6 feet
subsiding to 2 to 4 feet tonight.

Superior East 13420 14430 11320. Waves 3 to 6 feet.

$$

Titus

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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