Great Lakes Forecast
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FZUS63 KMQT 201401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sun Aug 20 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...A 29.8 inch trough over northern Minnesota will move
across Lake Superior this afternoon and reach the eastern Great
Lakes on Tuesday. A 30.2 inch high pressure extending from
Manitoba to Nebraska Tuesday night will move over Wisconsin
Thursday morning and remain over the Great Lakes through Friday.

LSZ162-202215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sun Aug 20 2017 /901 AM CDT Sun Aug 20 2017/

.REST OF TODAY...Southwest winds 10 to 20 knots veering west
late. Waves 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing south late. Waves calm
to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. A slight chance of showers. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-202215-
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-
1001 AM EDT Sun Aug 20 2017

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then veering west late. Waves
1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-202215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sun Aug 20 2017

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then diminishing to 5 to
15 knots late. Waves 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering northwest after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds less than 10 knots increasing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-202215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sun Aug 20 2017

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

$$

LSZ266-202215-
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-
1001 AM EDT Sun Aug 20 2017

.REST OF TODAY...Southwest winds 10 to 20 knots backing south in
the afternoon. A chance of showers and thunderstorms by mid
afternoon. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A chance of showers and thunderstorms through midnight.
Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ267-202215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sun Aug 20 2017

.REST OF TODAY...Southwest winds 10 to 20 knots becoming south
5 to 15 knots in the afternoon, then increasing to 10 to 20 knots
late. A chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 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.
.MONDAY...West winds 5 to 15 knots veering north late. Waves calm
to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.

$$
LSZ261-202215-
MAFOR 2015/
Superior West 11510 11520 11620 11610 11710 12700 11600. Waves
calm to 3 feet.

Superior North Central 13520 12610 13600. Waves 1 to 3 feet.

Superior South Central 13410 12510 12610 11600. Chance of showers
and thunderstorms late this afternoon and evening. Waves 2 feet
or less.


Superior East 11510 11410 11420 12520 11610 12600. Chance of
showers and thunderstorms this evening. Waves 1 to 3 feet.

$$

Petro

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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