Great Lakes Forecast
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FZUS63 KMQT 141939
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
339 PM EDT Fri Jul 14 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 30.2 inches, centered over Minnesota,
will continue to build over the Upper Great Lakes tonight. As the
high settles south on Saturday, a low pressure trough of 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.

LSZ162-150345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
339 PM EDT Fri Jul 14 2017 /239 PM CDT Fri Jul 14 2017/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of showers and isolated
thunderstorms after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west in the
afternoon. A slight chance of showers and thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...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 by mid
afternoon. 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 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 and thunderstorms. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-150345-
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-
339 PM EDT Fri Jul 14 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. A slight chance of
showers and isolated thunderstorms after midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Isolated thunderstorms through early
afternoon. A slight chance of showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves 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. A chance of thunderstorms after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering north. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ264-150345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
339 PM EDT Fri Jul 14 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. A slight chance of
showers after midnight. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Isolated thunderstorms through early
afternoon. A slight chance of showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots. Waves building to
1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots backing south
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 building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering north. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ265-150345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
339 PM EDT Fri Jul 14 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering northwest
late. A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY NIGHT...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
by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 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
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ266-150345-
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-
339 PM EDT Fri Jul 14 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering northwest
late. A slight chance of showers and thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...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 by mid
afternoon. 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 2 to 4 feet, then subsiding to
1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots veering northwest. A chance
of showers and thunderstorms. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-150345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
339 PM EDT Fri Jul 14 2017

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots veering southwest in the
afternoon, then veering northwest late. Isolated thunderstorms
through early afternoon. A chance of showers. Waves calm to
2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight, then increasing to 15 to 25 knots late. A slight
chance of showers through midnight. Waves building to 1 to
3 feet.
.SUNDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
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 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-150345-
MAFOR 1421/
Superior West 11500 13510 13520 11610. Chance of showers late
tonight. Waves 1 to 3 feet.

Superior North Central 14510 13520 11610. Chance of showers early
Saturday afternoon. Waves 1 to 3 feet.

Superior South Central 13600 11500 13510 11610. Waves 2 feet or
less.

Superior East 12710 11600 11500 14510. Chance of showers Saturday
afternoon. Waves 1 to 2 feet.

$$

KEC

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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