Great Lakes Forecast
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FZUS63 KMQT 240202
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 PM EDT Fri Jun 23 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...As a 29.4 inch low over Northern Quebec drifts to the
Canadian Maritimes through Sunday, 29.6 inch low pressure
troughing will remain across the Upper Great Lakes. High pressure
ridging of 30.0 inches will build into the Upper Great Lakes late
Sunday into Tuesday as 30.3 inch high pressure shifts eastward
across the Mid Mississippi Valley. Tuesday into Wednesday, low
pressure of 29.5 inches will lift out of the Northern Plains and
head towards the Upper Great Lakes and reach western Ontario on
Thursday.

LSZ162-241015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 PM EDT Fri Jun 23 2017 /902 PM CDT Fri Jun 23 2017/

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Scattered showers. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. Scattered showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Isolated
thunderstorms through midnight. Scattered rain showers. Waves
calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots. Scattered rain showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Scattered rain showers. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south. A chance
of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots veering west. Showers
likely. A chance of thunderstorms. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ263-241015-
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 PM EDT Fri Jun 23 2017

.REST OF TONIGHT...West winds 5 to 15 knots. Isolated showers.
Waves 2 to 4 feet subsiding to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots. Scattered rain showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Isolated
thunderstorms through midnight. Isolated rain showers. Waves calm
to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northwest less than
10 knots by mid afternoon. Isolated rain showers. Waves calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Scattered rain showers.
Waves 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. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots veering west. Showers
likely. A chance of thunderstorms. A chance of showers. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ264-241015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 PM EDT Fri Jun 23 2017

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
after midnight. Isolated rain showers by late evening. Waves 2 to
4 feet subsiding to calm to 2 feet.
.SATURDAY...Northwest winds less than 10 knots backing west in
the afternoon, then increasing to 5 to 15 knots late. Waves calm
to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering north late.
Isolated rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northwest less than
10 knots by mid afternoon. Isolated rain showers. Waves calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. A chance
of rain showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Rain showers likely and a chance of thunderstorms.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-241015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 PM EDT Fri Jun 23 2017

.REST OF TONIGHT...West winds 10 to 20 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest in the
afternoon, then backing west late. Isolated showers. Waves calm
to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Isolated rain
showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. Isolated rain showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...West winds 10 to 20 knots backing south. A chance of
showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...South winds 15 to 25 knots. Showers likely and a
chance of thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-241015-
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 PM EDT Fri Jun 23 2017

.REST OF TONIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight, then veering northwest late.
Isolated rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Isolated rain showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...South winds 15 to 25 knots. A chance of rain
showers. A chance of thunderstorms. Rain showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-241015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 PM EDT Fri Jun 23 2017

.REST OF TONIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming northwest 5 to 15 knots
late. Waves 1 to 3 feet subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
late. Scattered rain showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Isolated rain showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves building to 2 to 4 feet.

$$
LSZ261-241015-
MAFOR 2403/
Superior West 15610 12600. Scattered showers late overnight
through Saturday. Waves 1 to 3 feet.

Superior North Central 12710 13700 11600 12610. Waves 1 to 3
feet.

Superior South Central 11620 13610 12700 11710 11610. Waves 1 to
3 feet.

Superior East 12710 15700. 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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