Great Lakes Forecast
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FZUS63 KMQT 171402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Mon Jul 17 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 will remain over the
Upper Great Lakes today. Once this high shifts southeast, a 29.8
inch trough will cross Lake Superior Tuesday into Wednesday. The
trough will settle south of Lake Superior on Thursday as a 30.0
inch ridge builds over the Upper Great Lakes. On Friday another
trough at 29.8 inches will track across the Upper Great Lakes as
the ridge moves over the Ohio Valley.

LSZ162-172315-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Mon Jul 17 2017 /902 AM CDT Mon Jul 17 2017/

.REST OF TODAY...Southeast winds 5 to 15 knots backing northeast
late. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late. A
chance of showers through midnight. A chance of thunderstorms.
Showers likely after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-172315-
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-
1002 AM EDT Mon Jul 17 2017

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. Waves calm to 2 feet.
.TONIGHT...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 veering west in the
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-172315-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Mon Jul 17 2017

.REST OF TODAY...South winds 5 to 15 knots backing southeast in
the afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.TUESDAY...Southwest winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming southwest
less than 10 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds less than 10 knots. Waves calm to
2 feet.

$$

LSZ265-172315-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Mon Jul 17 2017

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots late. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A chance of showers and thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then veering northwest late. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-172315-
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-
1002 AM EDT Mon Jul 17 2017

.REST OF TODAY...South winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of showers. A chance of thunderstorms after midnight.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
A chance of showers and thunderstorms. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ267-172315-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Mon Jul 17 2017

.REST OF TODAY...South winds less than 10 knots becoming east
5 to 15 knots late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers and thunderstorms
after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. A chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$
LSZ261-172315-
MAFOR 1715/
Superior West 13300 11310 11510 12516 11510. Chance of showers
and thunderstorms this evening through Tuesday morning. Waves 2
feet or less.

Superior North Central 13310 11320 11420 11520 12510. Chance of
showers and thunderstorms overnight and Tuesday morning. Waves 1
to 3 feet tonight and Tuesday morning.

Superior South Central 11300 12310 11320 12420 12410. Chance of
showers late tonight. Chance of showers and thunderstorms Tuesday
morning. Waves 1 to 3 feet.

Superior East 11400 12300 11310 13420 11410. Chance of showers
and thunderstorms Tuesday morning. Waves 1 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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