Great Lakes Forecast
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000
FZUS63 KMQT 191349
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM 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 29.9 inches will reach the western
Great Lakes and then expand southward over the Ohio River Valley
today through Sunday. On Sunday afternoon a 29.8 inch trough moves
into western Lake Superior and then tracks east through Sunday
night. This trough will linger over the Upper Great Lakes through
Monday and move over the eastern Great Lakes on Tuesday. A 30.1
inch area of high pressure will drop south across the Upper
Mississippi Valley by Wednesday morning. This area of high
pressure will then move over the Great Lakes by Thursday and
linger through the end of the week.

LSZ162-192200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EDT Sat Aug 19 2017 /849 AM CDT Sat Aug 19 2017/

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

$$

LSZ263-192200-
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-
949 AM EDT Sat Aug 19 2017

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

$$

LSZ264-192200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EDT Sat Aug 19 2017

.REST OF TODAY...West winds 5 to 15 knots backing southwest in
the afternoon. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers and thunderstorms
by mid afternoon. 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 less than 10 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds less than 10 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-192200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EDT Sat Aug 19 2017

.REST OF TODAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then veering southwest late. A chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. A chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ266-192200-
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-
949 AM EDT Sat Aug 19 2017

.REST OF TODAY...Southwest winds 5 to 15 knots. Patchy fog
through late morning. Waves calm to 2 feet building to 1 to 3
feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots 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. A slight chance of showers and thunderstorms by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of thunderstorms through midnight. A
slight chance of showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ267-192200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EDT Sat Aug 19 2017

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

$$
LSZ261-192200-
MAFOR 1915/
Superior West 11620 15510 11510. Waves 1 to 3 feet.

Superior North Central 14510 11510 13520. Waves 1 to 3 feet.

Superior South Central 11610 11600 12500 14510. Waves 2 feet or
less.

Superior East 14500 11400 13510. Patchy fog late this morning.
Waves 2 feet or less.

$$

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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