Great Lakes Forecast
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FZUS63 KMQT 200212
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1012 PM EDT Sat Aug 19 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 30.0 inches centered over southern
Lower Michigan will reach the Ohio River Valley Sunday. A 29.8
inch trough over western Lake Superior Sunday will 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.

LSZ162-201015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1012 PM EDT Sat Aug 19 2017 /912 PM CDT Sat Aug 19 2017/

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots veering west late.
Isolated showers and thunderstorms. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-201015-
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-
1012 PM EDT Sat Aug 19 2017

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering west late. Isolated
showers and thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ264-201015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1012 PM EDT Sat Aug 19 2017

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Scattered showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers through midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.

$$

LSZ265-201015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1012 PM EDT Sat Aug 19 2017

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon. Scattered showers and thunderstorms by
mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A 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
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest. Waves
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.

$$

LSZ266-201015-
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-
1012 PM EDT Sat Aug 19 2017

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then diminishing to 5 to 15 knots late. Scattered
showers and thunderstorms by mid afternoon. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west late.
A chance of showers and a slight chance of thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. 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 becoming north
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 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.

$$

LSZ267-201015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1012 PM EDT Sat Aug 19 2017

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then increasing to 10 to 20 knots late. Isolated
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering west 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. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers after midnight. Waves calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots. Waves building
to 4 to 7 feet occasionally to 9 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 southwest
5 to 15 knots. Waves calm to 2 feet.

$$
LSZ261-201015-
MAFOR 2003/
Superior West 14510 11510 11520 11620 11610. Waves 1 to 3 feet.

Superior North Central 15510 11510 11610. Scattered showers and
thunderstorms Sunday afternoon. Waves 1 to 4 feet.

Superior South Central 11500 13510 13410 11510. Scattered showers
and thunderstorms late Sunday through Sunday evening. Waves 2
feet or less.

Superior East 11400 14510 11410 11420 11520. Scattered
thunderstorms with a chance of showers through early evening...
Then chance of showers late Sunday evening. 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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