Great Lakes Forecast
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FZUS63 KMQT 151347
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 AM EDT Sat Jul 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 30.1 inches, centered over southern
Wisconsin, will continue to push south towards the Ohio Valley by
this evening. An area of low pressure averaging 29.9 inches will
quickly track southeast through Lake Superior. By Sunday morning,
the trough will move southeast of Lake Superior as high pressure
of 30.1 inches builds back into the area and then lingers through
Monday. A 29.8 inch trough will cross Lake Superior Tuesday into
Wednesday as the high moves off the East Coast.

LSZ162-152200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EDT Sat Jul 15 2017 /847 AM CDT Sat Jul 15 2017/

.REST OF TODAY...Southwest winds 10 to 20 knots veering west
late. Isolated thunderstorms by late morning. A slight chance of
showers. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then diminishing to 5 to 15 knots late. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing northeast. A
chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering southwest.
Waves calm to 2 feet.

$$

LSZ263-152200-
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 Sat Jul 15 2017

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon. Isolated thunderstorms by late
morning. A slight chance of showers. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northeast. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming southwest
less than 10 knots. Waves calm to 2 feet.

$$

LSZ264-152200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EDT Sat Jul 15 2017

.REST OF TODAY...Southwest winds 10 to 20 knots veering west in
the afternoon, then diminishing to 5 to 15 knots late. Isolated
thunderstorms by late morning. A slight chance of showers. Waves
1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves building to 1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots becoming west less than
10 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots backing southwest
after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots becoming northeast less than
10 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots. Waves calm to
2 feet.

$$

LSZ265-152200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EDT Sat Jul 15 2017

.REST OF TODAY...Southwest winds 10 to 20 knots veering northwest
late. A slight chance of showers and isolated thunderstorms.
Waves calm to 2 feet.
.TONIGHT...North winds 15 to 25 knots. Waves building to 1 to
3 feet.
.SUNDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing northeast. A
chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ266-152200-
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 Sat Jul 15 2017

.REST OF TODAY...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon, then veering northwest late. A
slight chance of showers and isolated thunderstorms. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ267-152200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EDT Sat Jul 15 2017

.REST OF TODAY...Southwest winds 10 to 20 knots veering northwest
late. Isolated thunderstorms by late morning. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of showers through
midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing northeast. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$
LSZ261-152200-
MAFOR 1515/
Superior West 11520 11510 11610 11820 11120 11110 12100. Waves 1
to 3 feet.

Superior North Central 12620 11720 12820 11120 12810. Waves 1 to
3 feet.

Superior South Central 11510 11610 11710 11820 12830 12820. Waves
1 to 3 feet.

Superior East 12510 11710 14820 11820. Chance of showers late
this afternoon. Waves 2 to 3 feet.

$$

JSS

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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