Great Lakes Forecast
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547
FZUS63 KMQT 160148
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 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...An area of low pressure averaging 29.9 inches over
Lake Superior will quickly track southeast into the Lower Great
Lakes 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.

LSZ162-161000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 PM EDT Sat Jul 15 2017 /848 PM CDT Sat Jul 15 2017/

.REST OF TONIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves calm to 2 feet 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.

$$

LSZ263-161000-
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-
948 PM EDT Sat Jul 15 2017

.REST OF TONIGHT...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...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.

$$

LSZ264-161000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 PM EDT Sat Jul 15 2017

.REST OF TONIGHT...North winds 5 to 15 knots. Patchy fog through
midnight. Waves 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.

$$

LSZ265-161000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 PM EDT Sat Jul 15 2017

.REST OF TONIGHT...North winds 10 to 20 knots. Patchy fog through
late tonight. Waves calm to 2 feet building to 2 to 4 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.

$$

LSZ266-161000-
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-
948 PM EDT Sat Jul 15 2017

.REST OF TONIGHT...North winds 10 to 20 knots. Patchy fog through
late tonight. Waves calm to 2 feet building to 2 to 4 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.

$$

LSZ267-161000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 PM EDT Sat Jul 15 2017

.REST OF TONIGHT...Northwest winds 10 to 20 knots veering north
after midnight, then increasing to 15 to 25 knots late. Patchy
fog. Waves calm to 2 feet building to 2 to 4 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.

$$
LSZ261-161000-
MAFOR 1603/
Superior West 13110 11100 11200 13100. Waves 1 to 2 feet.

Superior North Central 13810 12800 11700 12600. Patchy fog through
late tonight. Waves 1 to 3 feet.

Superior South Central 13820 13810 11710 11700. Patchy fog through
late tonight. Waves 1 to 4 feet.

Superior East 14820 12810 11720 11710. Patchy fog through late
tonight. Waves 2 to 4 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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