Great Lakes Forecast
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FZUS63 KMQT 151951
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
351 PM 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 Illinois
will continue to shift south toward the Ohio Valley this evening. An
area of low pressure averaging 29.9 inches will quickly track
southeast through Lake Superior tonight. On Sunday morning, the
associated trough over southern Lake Huron will move southeast over
the Lower Great Lakes. Meanwhile, on Sunday high pressure of 30.1
inches will build back into the Upper Great Lakes and then
linger through Monday. As the high shifts southeast, a 29.8 inch
trough will cross Lake Superior Tuesday into Wednesday. The trough
settles south of Lake Superior on Thursday as a 30.0 inch ridge
builds over the Upper Great Lakes.

LSZ162-160400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
351 PM EDT Sat Jul 15 2017 /251 PM CDT Sat Jul 15 2017/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then diminishing to 5 to 15 knots late. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. 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...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-160400-
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-
351 PM EDT Sat Jul 15 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Isolated showers
and thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots veering southeast
after midnight, then becoming south 5 to 15 knots late. 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...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-160400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
351 PM EDT Sat Jul 15 2017

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots backing south late.
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...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds less than 10 knots becoming south
5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-160400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
351 PM EDT Sat Jul 15 2017

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing northwest late. 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...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 and thunderstorms after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ266-160400-
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-
351 PM EDT Sat Jul 15 2017

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

$$

LSZ267-160400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
351 PM EDT Sat Jul 15 2017

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Scattered
showers and isolated thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north 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, then building to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then veering east late. Waves
subsiding to 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 diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west. A chance of
showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-160400-
MAFOR 1521/
Superior West 11610 11810 12110 13100 11200. Waves 1 to 2 feet.

Superior North Central 11720 11820 13110 12800 11700. Waves 1 to
3 feet.

Superior South Central 11710 11810 12820 13810 11800. Waves 1 to
4 feet.

Superior East 12710 12810 11820 13810. Scattered showers this
evening. Waves 1 to 3 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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