Great Lakes Forecast
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FZUS63 KMQT 210759
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 AM EDT Fri Jul 21 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 30.0 inch high will drift to the lower Great Lakes
today, while keeping a ridge of 29.9 inches across Lake Superior.
At the same time, low pressure of 29.6 inches will develop over
the Plains. This low will track to the Upper Mississippi Valley
by Saturday night and will then move south across Wisconsin and
into lower Michigan. Sunday into Monday, a 30.0 inch high will
start to build across the Upper Mississippi Valley and slowly push
the 29.7 inch low across the eastern Great Lakes. The ridge of
high pressure will build into the Upper Great Lakes on Monday.
Trailing this surface high will be a trough of 29.8 inches that
will push across the Upper Great Lakes by Tuesday night.

LSZ162-211600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
359 AM EDT Fri Jul 21 2017 /259 AM CDT Fri Jul 21 2017/

.EARLY THIS MORNING...East winds less than 10 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Patchy fog through early afternoon. A
slight chance of showers and isolated thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots. Isolated thunderstorms
through midnight. A slight chance of showers. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A chance of showers. A chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-211600-
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-
359 AM EDT Fri Jul 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing northeast in the
afternoon, then becoming east 10 to 20 knots late. Patchy fog
through early afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...North winds less than 10 knots becoming south 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-211600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
359 AM EDT Fri Jul 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing east late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A slight chance of showers.
A slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
and a chance of thunderstorms through midnight, then a chance of
showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming south less than
10 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-211600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
359 AM EDT Fri Jul 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots veering northeast in the
afternoon, then veering east late. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots. A slight chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-211600-
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-
359 AM EDT Fri Jul 21 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing east late. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers and thunderstorms through midnight, then showers likely
after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots veering northeast by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ267-211600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
359 AM EDT Fri Jul 21 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then becoming east less than 10 knots late. Waves calm
to 2 feet.
.TONIGHT...East winds less than 10 knots increasing to 10 to
20 knots. A slight chance of showers after midnight. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots backing east
after midnight. A chance of showers and a slight chance of
thunderstorms through midnight, then showers likely after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Showers likely through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves calm
to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers through midnight. Waves calm
to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-211600-
MAFOR 2109/
Superior West 11500 11100 11300 11210 12220 12130. Patchy fog
this morning. Waves 2 feet or less.

Superior North Central 14600 11300 12310 11210. Waves 1 foot or
less.

Superior South Central 11600 11500 11700 11100 11200 13210. Waves
1 foot or less.

Superior East 11600 11500 11600 11700 12300 11310 11210. Patchy
fog early this afternoon. Waves 1 foot or less.

$$

Ritzman

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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