Great Lakes Forecast
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802
FZUS63 KMQT 191955
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 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 eastern
Iowa 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.

LSZ162-200300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 PM EDT Sat Aug 19 2017 /255 PM CDT Sat Aug 19 2017/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves 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.

$$

LSZ263-200300-
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-
355 PM EDT Sat Aug 19 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.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 becoming west 5 to 15 knots late.
Isolated showers and thunderstorms. Waves 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.

$$

LSZ264-200300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 PM EDT Sat Aug 19 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Scattered showers and
thunderstorms. Waves 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.

$$

LSZ265-200300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 PM EDT Sat Aug 19 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.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, then veering southwest late. 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.

$$

LSZ266-200300-
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-
355 PM EDT Sat Aug 19 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Waves subsiding to calm to 2 feet, then building to
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.
.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.

$$

LSZ267-200300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 PM EDT Sat Aug 19 2017

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then veering southwest late. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 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.

$$

LSZ261-200300-
MAFOR 1921/
Superior West 16510. Waves 1 to 3 feet.

Superior North Central 16510. Scattered showers and thunderstorms
Sunday afternoon. Waves 1 to 3 feet.

Superior South Central 11600 12500 13510 12410. Scattered showers
and thunderstorms late Sunday afternoon. Waves 2 feet or less.

Superior East 11600 11500 11400 14510 11410. Waves 1 to 2 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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